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Fitting ATB differential - Full rebuild ?

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05 Jul 2018 10:25 #193999 by sniper
Some advice please, I am fitting an ATB diff soon, would a full axle rebuild be best advised, the axle has presented no problems and is at 65k.

I'm hoping that the consensus is to just swap the ring gear over and throw it in......

sniper

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05 Jul 2018 12:25 #194004 by Lambert
Mine is on 80k ish and totally fine. If you have any doubts about it then now would be the time to inspect and replace but it shouldn't need routine things. It's not a land rover after all.

It's not a Jimny. It's my Jimny

Mooo said Ermintrude (black)
Boing said Zebedee (blue)
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05 Jul 2018 13:28 #194012 by S200KYS
Are you asking if the diff will need rebuilding?

The ATB is the actual crown wheel carrier isn't it? As such, then yes, someone with the necessary skills / experience would need to set it up so that the crown wheel sits in the right spot in relation to the pinion...

When we 'just' fit a Lockright / Detroit sort of locker it's a matter of taking the diff to pieces carefully laying each part down and labelling where it came from so that we can get inside the carrier to swap the gears for the locking plates, and then very carefully reassemble everything and hopefully it all goes back to where it was and nothing is disturbed, so the competent home mechanic can usually do it themselves...

With an ATB the side bearings on the original carrier would have to be swapped over and the whole lot set up again properly...?

HTH
Dave

Is It Sunday Yet? :)
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05 Jul 2018 19:12 #194027 by Lambert
There are plenty of how to guides for depthing and backlash adjustment of diffs available and honestly I shouldn't expect a genuine quaife diff to be more than a fraction of a millimetre off stock anyway so with a new quality set of side bearings I wouldn't really see much need to disturb the pinion anyway. That said though if you don't feel comfortable a gearbox shop shouldn't have any difficulty doing it for you then you just have it to bolt back into the axle.

It's not a Jimny. It's my Jimny

Mooo said Ermintrude (black)
Boing said Zebedee (blue)
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07 Jul 2018 20:56 #194106 by Keithy
Is an ATB the same as an ARB?

The carriers on mine required quite some adjustment of the side bearings to get the engagement correct.

All good fun if you're Au fait with gears.
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07 Jul 2018 21:26 #194111 by Riccy
No its more like a kaiser to install, much easier than an ARB, no airline for a start! Backlash much less critical, etc.

Swap the ring gear on to it. Backlash setting should be measured before and after. the workshop manual has pretty good info on setting it up. There is no need to touch the pinion shaft/bearings at all.

re-use the bearings (unless suspected damaged or mega mileage), as they match the wear rate to the gears and the pinion shaft bearings.

J999 MNY, M16 VVT, R7me gbox & Rocklobster,
31x10.5r15 Cooper STT, 2x ARB Lockd' 3.9 diffs & twin compressor,
6.5" total lift, Zookbob HD steering shock, Ignis recaro's
Custom bar & arches, rocksliders & guards,
Snorkel, K&N, 13500lb Winchmax, Buzzweld, etc, etc

Plus ULYSSES (06' trayback project)
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