Outer Limits 4x4 Board

Ok I have a 98 Lux IFS running a Lexus V8 with aftermarket management, its been tuned for a better torque curve and slightly more power. Its making 271nm of torque at 3000rpm at the wheels. It also making 155kw at the wheels running 33s and 4.88s.

I have now blown 2 rear diffs in around 3500ks and the 3rd is now making noise after around 2000ks. I am thinking that it the leafs may be twisting under power and adding to the problem. How strong is an 80 series diff will it hold up to the power.

I know there wider but am contemplating shortening it and adding a trac bar or just throwing cruiser diffs under front and rear with coils. Problem is I dont want to go to the trouble if its going to be weak. I want to add more power later and I dont want GQ diffs under it either

The 80 diffs will definately hold the power. Gotta remember that a turbo 1HZ or any form of 1HD will make a shiteload more torque than the 1UZ, and at lower revs. The only weak point in the 80 front diff is in reverse, loaded up a hill. A locker strengthens it. My turbo 1HZ is currently making just over 600nm @ wheels, it weighs 2800kg empty, and has 315/75/16 tyres. Never had any diff issues in the 4 years i/ve had it. The lux will probably weigh about 800kg less too. the only downside i can see with them going into a lux is the 80 series rear isnt centred

I know killalux shortened one using two short side shafts and just finding out what width that brought it back too. That would solve the offset problem. Obviously if it makes them narrower than the current IFS housing I wont do it. Also if that is the case I am at a bit of a loss to find a stronger diff while keeping it Toyota.

Unless I mod a IFS housing to take an 80 series centre.

did he do it to the front aswell as the rear???

No mate he ran a bundy front. At this stage I am not concerned about the front just want to stop blowing up rears. I will worry about the front if it starts blowing up. I am building an 85 solid axle up at the moment so this one only does light wheeling and family duties.

What about a 60 series rear diff.
Not as wide as an 80 but has the same centre.
Just remount the fuel tank on the passengers side.

Other wise even if 2 short side 80 axle are too narrow just get the long side shortened to suit the width you want. It would end up being very close to the centre being centred.

Guts wrote:What about a 60 series rear diff.
Not as wide as an 80 but has the same centre.
Just remount the fuel tank on the passengers side.

Use a transfer from td bundy and everything will line up sweet.

i would go gq /gu diff less hassle then norrowing 80 series diffs and they are as strong if not stronger then 80 series

booflux wrote:Ok I have a 98 Lux IFS running a Lexus V8 with aftermarket management, its been tuned for a better torque curve and slightly more power. Its making 271nm of torque at 3000rpm at the wheels. It also making 155kw at the wheels running 33s and 4.88s.

I have now blown 2 rear diffs in around 3500ks and the 3rd is now making noise after around 2000ks. I am thinking that it the leafs may be twisting under power and adding to the problem. How strong is an 80 series diff will it hold up to the power.

I know there wider but am contemplating shortening it and adding a trac bar or just throwing cruiser diffs under front and rear with coils. Problem is I dont want to go to the trouble if its going to be weak. I want to add more power later and I dont want GQ diffs under it either

Humble Gardner (HG) had the same problem, including shearing a set of longfields axle at the flange ... Cheezy built him a shaved 75 series housing, with upgared 10mm studs and 4 locating dowels, has as much clearance as a hilux housing, but is full float and disc brakes.

As guts said.... 60 series/early 75 series would probably be the best (stronger front centre than 80 series) but a bit narrower.
For the front diff if u wanted to maintain IFS, have a look at using a Pajero front, 8.5" ring gear and very strong... it may be more fabwork than going SAS however.

The really advantage of running 80 series rear axle are the rear disc and e-brake system .. and sure FF but you can get a 60 series FF also .. and make the disc conversion ..

I looked at the 60 as that was my first thought but the offset centre made me think it undoable??

I have had a good look at it last night with a mate giving it heaps while I followed in his car. The rear springs are twisting up really bad, so I am thinking I will either need a trac bar or convert to coils, to lessen this. I will send HG a PM to find out what he thinks of his as I know he has more power and torque than I do so that may be the answer.