The Toyota LandCruiser 79 Series is one of the most capable work and touring platforms in Australia, but its suspension is set up from the factory for one job: carrying a load on a solid front axle and rear leaf springs. Run it empty, lift it, or load it beyond the spring rating and the same few problems show up again and again - a harsh unladen ride, rear sag under a canopy or tray, steering wander after a lift, and shimmy through the wheel on corrugations. This guide covers each problem, what actually causes it on the 79 Series, and how to fix it properly.
The most common complaint, and it usually is not a fault - it is spring rate. The 79 Series ships with heavy-duty leaf packs rated to carry constant load. Run the ute empty and those springs barely move, so every corrugation and expansion joint goes straight through the chassis. The fix is matching the spring rate to the weight you actually carry day to day, not the maximum you might carry once a year.
If your load varies a lot - empty tray during the week, loaded canopy on trips - fixed-valve shocks will always be a compromise. Adjustable damping solves it: a remote-reservoir kit like the Dobinsons MRA 2" kit or Toughdog Remote Res kit lets you wind compression off for the empty commute and firm it back up when loaded, by hand, at the shock.
Factory leaf springs sag when the constant load exceeds what they were rated for - a steel tray, canopy, drawers, water and a second battery add up to hundreds of kilograms that never come off the vehicle. Once the rear drops, headlights point high, steering goes light, and the ride gets worse, not softer.
The fix is rear leaf springs rated for your constant accessory weight, like the Toughdog heavy-duty rear leafs, or a complete kit with load-matched rates. Tell whoever supplies the springs your actual setup - the right rate keeps the vehicle level and comfortable; guessing usually lands you back at problem one.
The 79 Series locates its solid front axle with radius arms and a panhard rod. Lift the vehicle and two things change: caster angle rotates back as the radius arms swing down, and the panhard rod pulls the axle slightly off-centre. Less caster means less self-centring - the truck follows road camber and needs constant correction. This is geometry, not a defect, and it gets more noticeable the higher you lift.
At 2" of lift most 79s drive fine as supplied. From 3" up, caster correction - offset radius arm bushes or adjustable radius arms - restores steering feel, and an adjustable front panhard rod re-centres the axle under the vehicle. Wheel alignment after any lift is mandatory, and worth repeating after the 500km settle-in period.
A rhythmic shake through the wheel over corrugations or after hitting a bump usually traces back to a worn steering damper, worn radius arm bushes, unbalanced tyres or caster that is out of spec - often several at once on a lifted truck. Start with the cheap checks: tyre balance and pressures, then bushes and alignment. A quality damper like the Toughdog return-to-centre steering damper adds real control, but treat it as part of the fix - a damper can mask worn components without curing them.
2" (50mm) is the sweet spot for most work and touring builds: clearance for 33" tyres, better ride with matched springs, and usually no geometry correction needed. See the Dobinsons Monotube 2" or Toughdog complete kit.
3" (75mm) suits serious touring with bigger rubber - budget for caster correction and an adjustable panhard alongside a kit like the Dobinsons MRA 3" or Monotube 3".
4" (100mm) - like the MRA 4" or Nitro Gas 4" - clears 33-35" tyres depending on offset, but caster correction is essential, extended brake lines are needed, and driveline angles should be checked. On Single Cab models built after 08/2016, the lower front crossmember under the tailshaft needs modification for clearance at this height.
Depends on your state and the total lift. Suspension lifts beyond your state's allowable limit (commonly 50mm without certification, less once combined with bigger tyres) may require engineering approval under the applicable light vehicle modification rules (VSB14/NCOP). Check your state's requirements before buying - an uncertified over-height lift can affect insurance and roadworthiness. We flag this on every 3" and 4" kit we sell.
The 79 Series Single Cab runs from 1999 with the 4.2L 1HZ diesel, gaining the 4.5L 1VD-FTV V8 in 2007; the Dual Cab arrived in 2012 with the V8. Suspension kits fit both, with spring rates chosen for your load. The one trap: on Single Cabs built after 08/2016, 3" and 4" lifts need the lower front crossmember under the tailshaft modified for clearance.
Only if the spring rates match your real load. Height alone fixes nothing - a 79 lifted on springs too stiff for its load rides worse than stock. Rate selection first, height second.
Taller springs push a standard shock outside its designed travel and valving. Springs and shocks should be changed as a matched pair - which is what a complete kit is.
Typically needs a 4" lift plus the right wheel offset, and possibly guard work - and check your state's legality rules for combined lift and tyre size. 33s fit comfortably at 2-3".
Airbags suit variable loads on top of a correctly-rated spring - they are a load-levelling aid, not a fix for a spring that is flat or under-rated to begin with.
Not sure what your build needs? Talk to our suspension team with your accessory list and typical load, or browse all 79 Series lift kits and use the parts finder to see everything that fits your truck.
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