NewHilux.net

2006 hilux rear axle, in a truck with a 2kd non intercooled and manual box

How much torque can rear axle handle safely?
Thinking of engine swaps but dont want to put torque monster engine in and then explode rear axle!

Its likely to be an 8in diff which variations have been used across many toyotas for years... Including Supras and supercharged V6 hiluxs.

So they are strong, but like all things, they can fail.

Mine has 600Nm at the rear wheels and is still alive.

Yeah, I know the older axles were a popular upgrade for land rovers (which are weak axles!)
But people run 6bt engines with 600lbft (800nm plus) on td5 axles (marginally stronger than original)

The hilux rear axle looks much bigger and stronger than a land rover axle but would be dealing with all the torque (especially if I ditched the 4wd system!)

In Australia Landrovers got Dana rear axles after late SIIA. I think they were Dana60 which are tough as nails, used in K20 Chevrolet, J20 Jeep and on plenty of US big block powered vehicles.

UK Land rovers got the Salisbury rear on lwb models, which is basically a Dana axle, much stronger but they only kept using it until late 90s

They redesigned the rover type axles for the td5 90/110 so they are a bit stronger (not as strong as the salisbury/Dana type though)

Obviously 90/110 are permanent 4wd with centre diff so the torque is shared a bit across axles (never all to the back obviously)

Just wondering how well the toyota hilux rear axle will handle the torque of a cummins 6bt

I don't know of anyone that has put more than 700nm through them (doesn't mean they can't handle more), I think it would depend on how you use that torque. Are you going to be towing a lot? or running large tyres? Is it going through an auto to insulate the drivetrain from shock-loading? or a manual where the torque could hit quickly?

Well the 6bt will put out 500~600lbft peak, but just off idle they make something like 200lbft

So although torque figures will be high, it wont experience a sudden 400lbft jump

Towing wise, not much apart from the odd broken car or small trailer (uk trailer laws are mad)

And tyres, it has a set of Cooper 245/75R16, so 30.5" ish

Manual box 5 speed, but engine would have a 3200rpm spring

So I'm hoping the axle will deal with the torque

Let's face it land rover axles break with 300lbft through them, but shared across 2 axles they just about cope unless driven very hard, so hopefully the hilux rear axle can cope

With a 5.9 cummins, dont need to drive it silly hard, it has so much torque its borderline silly but that's part the fun!


With the tyres and if the diff ratio I found is correct (3.583 rear?)

The cummins would be turning 1850rpm in 5th at 60mph, which is fairly good
2150rpm at 70mph

Wouldn't want to fit much larger tyres anyway, but maximum I'd go to is 33" (255/85R16) which drops rpm by 180ish in 5th at 60 and 70mph