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A31 Manual Tailshaft

Chris_A31

By Chris_A31,
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daisu Mentor

daisu

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Posted (edited)

I'm halfway through conversion on mine cefiro. I took the R32 manual tailshaft, and my A31 auto. Pulled them both apart in the middle, then you have to remove the nut and bash the hub thing off the spline. Then you swap the little hub things onto the opposite tailshafts, so that the R32 front half will bolt onto the rear of the A31 tailshaft. I'm about to install it in my car in a couple hours I'll let you know how it goes :yucky:

Edited by daisu
Chris_A31 Enthusiast

Chris_A31

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Meh. I'm not keen on modding any other shaft just yet. The car is at the shop and most things are done apart from that... What exactly needs to be modded on the auto shaft?

daisu Mentor

daisu

Posted
Posted

You have an A31 auto tailshaft, right? I don't know whether or not you have an R32 manual tailshaft (but they are easy enough to get).

The tailshaft is basically 2 pieces bolted together. The R32 shaft fits into your gearbox, buts it's not long enough to bolt onto the diff. And the A31 shaft is the right length but it doesn't fit in your gearbox.

So you unbolt them both in the center (4 bolts), and make a hybrid tailshaft. But they don't swap over because the mounting hubs are different. So there is a nut holding the mounting hub onto the tailshaft, you undo the nut (there is an indent in it to prevent removal, reshape with a good flathead screwdriver), and give the mounting hub a few good whacks with a hammer (it is splined onto the tailshaft). The mounting hubs can be swapped between the tailshafts, enabling you to swap the other half of the tailshaft. You end up with a tailshaft that fits into your manual gearbox and is the right length to bolt up to the diff.

It took me about 30mins to pull apart both tailshafts and reassemble 1.

daisu Mentor

daisu

Posted
Posted (edited)

Well AFAIK, the only other option is a manual A31 tailshaft (might be hard to find) or a new custom made tailshaft ($$$). If you want, I can run through the whole process with photos.

EDIT:

Well, I just fitted my R32/A31 hybrid tailshaft. And it looks like it's too short. It bolts up to the diff, and to the underbody, and the spline goes into the gearbox, but it appears that the spline needs to go into the gearbox another 10-20mm.

I'm stumped, what does everyone else do when they do an auto to manual conversion?

Edited by daisu
daisu Mentor

daisu

Posted
Posted

Yes, please tell us what tailshaft you used.

I asked about my tailshaft on another forum and have been told that I shouldn't worry about the spline not engaging the last 10mm that it is designed that way so it can slide in and out as the engine/gearbox moves around.

He makes a good point, if it was supposed to be flush up against the gearbox it would be a hub face with bolts to attach it to the gearbox (like the other end of the shaft is attached to the diff).

Chris_A31 Enthusiast

Chris_A31

Posted
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The guys at Jazmac (SA) done the conversion and they sourced a manual a31 tailshaft from Import Spares (i think it was called that anyway)

I havent got under the car yet to have a look at how far the spline sticks out but yeah that sounds about right

So much more responsive now, and pull all the way to redline with kkr430 :)

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