According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1970 Toyota Land Cruiser has 7 documented known issues, with 3 rated critical. The most serious are Inadequate Drum Brakes (Single-Circuit Early Cars) ($600-$2,500 repair), FJ40 Body Tub & Quarter-Panel Rust (Rockers, Floors, Wheel Arches, Cowl) ($1,500-$12,000 repair) and Undersized Cooling System — F/2F Overheating ($400-$1,800 repair). Across all issues with published estimates, repair costs range from $250 to $12,000. DIY maintenance guides at au7o.io.
On the 1960-1980 Toyota Land Cruiser, the FJ40's factory four-wheel drum brakes are widely regarded as old technology that is inadequate for modern roads, larger tires, and confident off-road descents. Drums are high-maintenance (constant shoe and adjuster fiddling to keep them performing), fade badly on long downhill runs, and grab unevenly when wet after a water crossing. Worse, pre-1968 FJ40s use a SINGLE-circuit master cylinder — one leak anywhere in the system means total brake loss with no backup. The wheel cylinders, hoses and master are also commonly seized or weeping after decades of sitting.
Common Symptoms
Long pedal travel and poor, fade-prone stopping
Brakes pull or grab unevenly, especially when wet
Constant manual adjustment needed to keep pedal up
Seized wheel cylinders / frozen adjusters after storage
Total brake loss risk on single-circuit pre-'68 cars
How to Fix
The standard restoration upgrade is a front (or full four-wheel) disc-brake conversion. Well-proven kits from JTOutfitters, Cruiser Corps, Manafre and Specter swap the front drums for discs, and rear kits commonly adapt affordable mid-'80s GM Monte Carlo calipers. Pair the discs with the correct later-model brake booster (the trick is grabbing the complete later pedal box so the booster bolts up) and, on early trucks, convert the single-circuit system to a DUAL-circuit master cylinder with re-plumbed lines so a single failure can't kill all braking. Finish with stainless flex lines and a fresh proportioning valve for balanced, fade-resistant stopping.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
JTOutfitters FDBKIT870975 front disc-brake conversion kit
front vented-rotor, loaded-caliper, bracket, hose and hardware conversion for the specified drum axle Fitment/availability: Designed for August 1970-September 1975 FJ40/FJ55 drum-brake axles; pre-July-1970 trucks require 9-to-10 mm line …
JTOutfitters SUPERDISCKIT-1 four-wheel disc kit with master cylinder
front-and-rear conversion package with master cylinder when a qualified builder validates complete-system balance and parking brake Fitment/availability: Designed for August 1970-September 1975 FJ40/FJ55; earlier trucks still require dua…
On the 1960-1984 Toyota Land Cruiser, rust is the single biggest enemy of an FJ40 restoration and follows a predictable pattern across every year of the run. The thin factory steel and lack of cavity protection let water collect in the rear quarter panels (the lower 'dogleg' ahead of the rear arch), the rocker panels/door sills, the floor pans and seat risers, the rear wheel-well lips, the body mounts, and the cowl/firewall vent area. Mud and salt pack into the boxed rockers and double-skinned quarters, so cars that look 'rust-free' from outside are frequently rotten from the inside out. Because the frame also carries every off-road load, frame rail and crossmember corrosion is structural, not cosmetic. Untreated, the tub loses its structural integrity and door/tailgate alignment goes away.
Common Symptoms
Bubbling/blistering paint along rear quarters and rockers
Soft or perforated floor pans and seat mounts
Rust holes at rear wheel-arch lips and lower doglegs
Doors and tailgate no longer align or latch cleanly
Flaking, scaly rust on frame rails and body mounts
How to Fix
Restorers cut out ALL the rot rather than coat over it, then weld in reproduction steel: CCOT/Specter/Aqualu 16-gauge quarter-panel patch panels and dogleg sections, new rocker/sill panels, and full replacement or fabricated floor pans (many builds upgrade to heavier diamond-plate floors). Critically, the proven bulletproofing step is to treat the inside of the boxed cavities AFTER welding — flush with rust converter/epoxy primer and pump cavity wax (Cosmoline/Fluid Film/Eastwood) into the rockers, quarters and frame rails so the repair doesn't simply rot again from within. Epoxy-prime bare steel immediately, seam-seal all overlaps, and undercoat. Frame rot is addressed by boxing/plating the rails or, in severe cases, a replacement frame.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
RebornFJ SYC-TY65-06L steel left rear fender/quarter panel
left quarter replacement when rust extends beyond a small patch but the remaining tub is sound Fitment/availability: 1968-1984 FJ40 left/driver-side rear quarter; bare panel excludes lights, flares and hardware Fitment/availability: Live…
RebornFJ stamped steel outer rocker panel, selectable side
outer rocker skin after the inner sill and body mounts are proven repairable Fitment/availability: FJ40/FJ45 selectable outer rocker side; confirm production-year contours, LHD/RHD and adjoining panel condition before purchase Fitment/av…
RebornFJ heavy-gauge front floor repair panel, selectable side
localized weld-in floor-pan branch after surrounding supports are inspected Fitment/availability: 1968-1984 FJ40/FJ45 left or right front floor; verify transmission cover, seat mount, fuel-tank and drive-side configuration Fitment/availa…
complete rear-half replacement when floor, wheel wells and side panels are too extensively corroded for isolated patches Fitment/availability: 1968-1978 FJ40 left-hand-drive rear body; not the 1979-1984 or early pre-1968 branch Fitment/a…
On the 1960-1984 Toyota Land Cruiser, the factory FJ40 cooling system was marginal when new and is badly outmatched today, especially in hot climates, in traffic, or after an engine rebuild. The stock 2- or 3-core radiator simply doesn't have enough surface area to keep the long, torquey F/2F six cool, and the engine-driven flex fan is small and inefficient. Trucks that have sat for years frequently develop blocked water jackets and a silted/scaled radiator core, which compounds the problem so the engine only overheats once ambient temps climb. A failed thermostat, a tired water pump, or air trapped during refill (the system needs proper bleeding) round out the common causes. Chronic overheating risks warped heads and cracked blocks on these irreplaceable engines.
Common Symptoms
Temp gauge climbing in traffic, on grades, or in hot weather
Overheats only when ambient temperature is high (blocked jackets)
Coolant loss, weeping water pump, or steam from the cap
Boil-over after a long highway pull
Runs cool on the move but heats up the moment it stops
How to Fix
The community bulletproofing recipe: fit a high-capacity aftermarket aluminum radiator (3- or 4-core, often a CSF or Wizard Cooling unit), add a proper full radiator SHROUD (the single biggest free improvement to airflow), and replace the old flex fan with a quality fan clutch or a high-flow electric fan setup. Run a new high-flow water pump and a correct-temp thermostat with a fresh O-ring/seal, then back-flush or rod-out the block water jackets if the truck sat. Always bleed the system fully on refill. Many restorers also delete chronic air pockets with a proper fill/bleed procedure and keep a 50/50 coolant mix with a quality cap that holds rated pressure.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Toyota 16400-61020 genuine radiator assembly, superseded to 16400-49356
stock-configuration radiator replacement when pressure/flow inspection proves the original radiator leaks or is restricted Fitment/availability: VIN-confirmed 1975-1984 Land Cruiser F/2F branch within this issue; seller also lists B/3B c…
On the 1960-1984 Toyota Land Cruiser, the FJ40 uses a solid front axle with closed 'birfield' constant-velocity joints inside steering knuckles that pivot on trunnion (king-pin) bearings. These knuckle bearings carry a large share of the vehicle's weight and take constant abuse, so over decades the races wear a groove in the straight-ahead position and the birfields wear on one loaded face. The result is steering that no longer self-centers, clicks/clunks on full lock, and front-end vibration. Compounding it, the knuckle inner seals/felt wipers leak gear oil and let grit in, which accelerates wear and contaminates the birf grease. Neglected, a worn birf can eventually crack a cage or shed a ball off-road.
Common Symptoms
Steering won't return to center; 'detent' clicks turning lock to lock
Clunk/click from the front hubs at full steering lock
Gear oil leaking from the knuckle balls / wet inner fender
Front-end vibration or wander
Grease contamination found at knuckle teardown
How to Fix
The proven fix is a full front-axle knuckle overhaul: disassemble the knuckles, replace all four Koyo trunnion/knuckle bearings and races as a set (they wear evenly, so do them together), re-shim the king-pin preload to spec, and install a complete knuckle rebuild kit (inner axle seals, felt wipers, gaskets, lock washers). A clever bulletproofing trick veterans use is to SWAP the birfields side-to-side so the worn face is unloaded, extending their life, and to repack with proper moly birfield grease. For hard use, heavy-duty (Marlin Crawler) inner seals keep contamination out so the rebuild lasts.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
drum-brake branch seals, gaskets, wipers, shims, lock washers and Japanese Koyo/Nachi trunnion bearings Fitment/availability: March 1969 through September 1975 FJ40/FJ55 with drum brakes; one kit services the axle Fitment/availability: L…
disc-brake axle bearing/seal service kit after joint and housing inspection Fitment/availability: 1976-1984 disc-brake FJ40; one kit services both sides and includes Nachi trunnion bearings, Koyo wheel bearings, seals and wipers Fitment/…
On the 1960-1984 Toyota Land Cruiser, vague, wandering 'death-wiggle' steering is one of the most universal FJ40 complaints. The factory recirculating-ball steering box wears in its sector shaft and worm over decades, develops play and starts to leak, while the surrounding linkage — tie-rod ends, relay (drag) link ends, the under-hood steering U-joints, and the spring bushings — also wears and stacks up slop. The dangerous DIY mistake the forums warn against is simply cranking the box's adjustment screw to remove all free play: that binds the gear on-center and rapidly destroys the sector shaft, killing the box. Manual-steering early trucks feel especially heavy and imprecise with this wear.
Common Symptoms
Lots of steering-wheel free play / vehicle wanders
Clunk or shimmy ('death wobble') over bumps
Gear-oil leak from the steering box
Heavy, imprecise effort on manual-steer trucks
Steering tightens or binds on-center if over-adjusted
How to Fix
The right restoration approach is to renew the whole steering chain, not just chase the box: replace all tie-rod and relay-rod ends, the steering U-joints, and the spring bushings first, then rebuild or replace the steering box with a fresh seal kit and CORRECTLY shimmed on-center lash (snug at center, not bound). Many restorers upgrade to a later FJ40 factory power-steering box (1979–84) for far better feel, or fit a modern EZ Electric Power Steering kit (Koyo/NSK components) that bolts to the column for effortless, precise steering. A correctly set, rebuilt box plus tight linkage transforms the drive.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
JTOutfitters FJ40TREKIT complete tie-rod and relay-rod end kit
complete steering-linkage end renewal when play is measured at the joints Fitment/availability: FJ40/FJ45/FJ55 linkage except 1963-1967 FJ45LV; confirm left-hand-drive linkage and all five joint positions before installation Fitment/avai…
City Racer 45230-36010-equivalent steering coupling/rag joint
replace a cracked, delaminated or loose column rag joint after confirming the joint is a source of play Fitment/availability: September 1972 and later FJ40/FJ45/FJ55 with the matching two-piece column coupling Fitment/availability: Live …
On the 1960-1974 Toyota Land Cruiser, early FJ40s came with the column- or floor-shift 3-speed manual, which restorers and off-roaders consider the drivetrain's weak link. It has a big gap between gears (no usable highway/cruising ratio that keeps the engine in its sweet spot), making the truck feel under-geared and busy at modern road speeds. The 3-speed's transfer-case casting is also regarded as more brittle than the later 4-speed's stronger aluminum case, and worn synchros/baulk rings make it crunch into gear. While the matching 3-speed t-case actually offers a deeper 2.31:1 low range, the on-road drivability and durability of the 3-speed is the limiting factor for a usable restored truck.
Common Symptoms
Engine buzzing/under-geared at highway speed
Wide, awkward gap between gear ratios
Grinding or crunching into gear (worn synchros)
Jumping out of gear on overrun
Cracked/brittle 3-speed transfer-case casting
How to Fix
The classic, well-documented upgrade is the H42 4-speed swap. The 1975–79 (10/73–7/80) H42 4-speed bolts up to the earlier transfer case, giving a proper road gear plus better ratios. The job needs a 4-speed bellhousing, the correct transmission output gear, an output bearing, and the 4-speed shift linkage/front-output shift fork — kits (e.g. CruiserParts' 3-to-4-speed conversion) bundle the parts. Builders deliberately choose the EARLY H42 (pre-8/80) because the later 19-spline output and bolt pattern won't mate to the one-piece transfer case. If keeping the 3-speed, restorers at minimum rebuild it with fresh synchros and handle the brittle case carefully.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
complete used four-speed conversion including transmission, bellhousing, flywheel, conversion gear/bearing, shifters, flanges, driveshafts, gaskets and hardware Fitment/availability: FJ40 currently equipped with a factory three-speed; se…
On the 1960-1984 Toyota Land Cruiser, the earliest FJ40s left the factory with a low-output generator (and on some markets a 6-volt or externally-regulated system), and even the later factory alternators are only rated around 38–55 amps. That is nowhere near enough once you add electric cooling fans, modern lighting, a winch, or accessories — the result is dim lights, a slowly drained battery and a cooked, brittle decades-old wiring harness. The stock harness was designed around the small factory alternator, so simply bolting on a high-amp unit and feeding it through the original wiring overloads and overheats the OEM harness. Old bullet connectors, ground points and the external regulator are common no-start and flicker culprits.
Common Symptoms
Dim headlights, especially at idle
Battery goes flat or won't hold charge
Charge/ammeter reads low or erratic
Melted or brittle, cracking wiring insulation
Intermittent no-start / flickering gauges from bad grounds
How to Fix
Restorers convert to a modern internally-regulated alternator — either an upgraded Toyota internal-regulator unit (e.g. the 55A 27020-61071 family) or a higher-output GM Delco (CS130, up to ~105A) on a bracket adapter. The key bulletproofing detail the forums stress: run the high-output alternator's main charge wire DIRECTLY to the battery with appropriately sized cable rather than back through the stock harness, and wire the alternator's sense terminal to the fuse block so it compensates for voltage drop (brighter lights, better charge). Refresh grounds, replace crusty bullet connectors, and on 6-volt trucks do a full 12-volt conversion. A new reproduction harness is the gold-standard fix for a brittle original.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
pre-terminated connector, boot, ground terminal and splice materials for the specific 55A Toyota alternator conversion Fitment/availability: Early FJ40 conversion using the Toyota 27020-61071-family 1979-1987 55A internally regulated alt…
repair heat-damaged, brittle or missing alternator sub-harness wiring without treating every truck as one connector style Fitment/availability: ARH1 for 1967-1977 square three-terminal; ARH2 for late-1977 through December 1978 round thre…
whole-vehicle rewire branch only when the original harness is broadly brittle or modified beyond safe localized repair Fitment/availability: 1963-1974 40-series restoration/custom rewire; not an OEM direct replacement, has no ground or s…
What are the most common Toyota Land Cruiser problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1970 Toyota Land Cruiser has 7 documented issues. The most frequently reported are: Inadequate Drum Brakes (Single-Circuit Early Cars), FJ40 Body Tub & Quarter-Panel Rust (Rockers, Floors, Wheel Arches, Cowl), Undersized Cooling System — F/2F Overheating. Of these, 3 are rated critical and should be addressed promptly.
Is the Toyota Land Cruiser reliable?
The 1970 Toyota Land Cruiser has 7 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 3 issues are rated critical: Inadequate Drum Brakes (Single-Circuit Early Cars) and FJ40 Body Tub & Quarter-Panel Rust (Rockers, Floors, Wheel Arches, Cowl) and Undersized Cooling System — F/2F Overheating. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Toyota Land Cruiser problems?
Repair costs for known Toyota Land Cruiser issues range from $250 to $12,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Inadequate Drum Brakes (Single-Circuit Early Cars), typically costs $600-$2,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 1960-1980 Toyota Land Cruiser Inadequate Drum Brakes (Single-Circuit Early Cars)?
The FJ40's factory four-wheel drum brakes are widely regarded as old technology that is inadequate for modern roads, larger tires, and confident off-road descents. Drums are high-maintenance (constant shoe and adjuster fiddling to keep them performing), fade badly on long downhil… Repairs typically run $600-$2,500. Severity: high.
What is the 1960-1984 Toyota Land Cruiser FJ40 Body Tub & Quarter-Panel Rust (Rockers, Floors, Wheel Arches, Cowl)?
Rust is the single biggest enemy of an FJ40 restoration and follows a predictable pattern across every year of the run. The thin factory steel and lack of cavity protection let water collect in the rear quarter panels (the lower 'dogleg' ahead of the rear arch), the rocker panels… Repairs typically run $1,500-$12,000. Severity: high.
What is the 1960-1984 Toyota Land Cruiser Undersized Cooling System — F/2F Overheating?
The factory FJ40 cooling system was marginal when new and is badly outmatched today, especially in hot climates, in traffic, or after an engine rebuild. The stock 2- or 3-core radiator simply doesn't have enough surface area to keep the long, torquey F/2F six cool, and the engine… Repairs typically run $400-$1,800. Severity: high.
What is the 1960-1984 Toyota Land Cruiser Front Axle Knuckle / Birfield & Trunnion Bearing Wear?
The FJ40 uses a solid front axle with closed 'birfield' constant-velocity joints inside steering knuckles that pivot on trunnion (king-pin) bearings. These knuckle bearings carry a large share of the vehicle's weight and take constant abuse, so over decades the races wear a groov… Repairs typically run $400-$1,600. Severity: medium.
What is the 1960-1984 Toyota Land Cruiser Sloppy Recirculating-Ball Steering Box & Worn Linkage?
Vague, wandering 'death-wiggle' steering is one of the most universal FJ40 complaints. The factory recirculating-ball steering box wears in its sector shaft and worm over decades, develops play and starts to leak, while the surrounding linkage — tie-rod ends, relay (drag) link en… Repairs typically run $300-$2,000. Severity: medium.
What is the 1960-1974 Toyota Land Cruiser 3-Speed Transmission: Tall Gearing & Brittle Case?
Early FJ40s came with the column- or floor-shift 3-speed manual, which restorers and off-roaders consider the drivetrain's weak link. It has a big gap between gears (no usable highway/cruising ratio that keeps the engine in its sweet spot), making the truck feel under-geared and… Repairs typically run $800-$4,000. Severity: medium.
What is the 1960-1984 Toyota Land Cruiser Weak Charging & Aging Electrical System?
The earliest FJ40s left the factory with a low-output generator (and on some markets a 6-volt or externally-regulated system), and even the later factory alternators are only rated around 38–55 amps. That is nowhere near enough once you add electric cooling fans, modern lighting,… Repairs typically run $250-$1,500. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
