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R34 25Gt 2001 Rear Diff Choices?

Teiresias
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Teiresias Community Regular

Teiresias

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As mentioned, R34 25GT 2001 Auto.

Thinking about replacing/might have to replace my rear diff due to old damage rearing its head slowly (ongoing repairs as things show themselves), it's an auto and I just wanna know what options I have other than buying a second hand one.

Thanks, Teir.

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Teiresias Community Regular

Teiresias

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Grease leaking from the CV joint, really no way to tell till I get it checked out more, it was a side impact into a small gutter, but hard enough that I span 360 and over the gutter. Baring, ctrl arms, rack and pinnion all changed. while I'm not sure if I'll end up having to replace the diff or not, just wanting to know my options.

GTSBoy Grand Master

GTSBoy

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The CV could have been damaged, but I'd bet that if it was, you'd really notice it driving around. It's more likely that the boot on the CV is just split (either from normal aging or perhaps from being stressed during the gutter crash).

The reason I wouldn't expect the diff to have suffered too much is that there is a sliding connection between the hub and the outer end of the driveshaft, so there's already one place where movement can occur without transmitting load along the shaft, then you have CV joints at each end of the shaft, so thay can absorb an amount of movement (and perhaps damage) before transmitting a lot of force along the shaft - all before the connection at the diff's axle flange. In order to damage the diff, you'd have to overcome all those little buffers, and to do that you'd be simultaneously making big damage to the various suspension arms. It is far more common in such impacts to do small but noticeable damage to the suspension arms, and to bend the rear subframe, than to damage the diff.

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

if you wish to replace the diff, just get a turbo R34 diff centre and use the Auto Crown on it to maintain the right ratio. From memory, R34s and S15s both use Torsen diffs, which IMO is great for street and light track work as they don't "thump" and don't require as much maintenance as your conventional clutch pack mechanical diffs

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