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Help With R33 Driveshaft Issues

DRFT 14
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DRFT 14 Collaborator

DRFT 14

Posted
Posted

I changed my previously RB20 fitted Silvia to RB25DET running gear and swapped the RB20DET driveshaft tolk to a Nissan Terrano yolk. A respected Nissan specialist wrecker sold me this yolk saying it was identical to the RB25DET yolk. I even asked around on the forums and most people backed this up.

I went ahead and took my driveshaft to a specialist and got the new yolk welded up. I have come across a problem however. The snout does actually slide into the 25t gearbox, but doesnt slide in all the way because the the yolk comes in contact with the gearbox dust shield. Some pics to help explain..

DSC02263.jpg

DSC02262.jpg

Now, because of this my initial measurment is now wrong and the driveshaft will not even clear the sway bar to bolt onto te diff. Its 6cm too long. I would simply take it back, pay an extra $100 and get it shortened, but the snout only slides 2/3 of the way in....like so-

DSC02267.jpg

The black vivid indicates where the yolk gets in contact with the dust shield and stops. Not exactly promising when im pushing for 400hp.

Ive already spent a few hundred on this driveshaft so i dont want to get a new one piece made up from an original RB25DET driveshaft. Ive decided im going to take it to a michinist and cut around the yolk so that it slides in all the way through the dust shield and into the input shaft. I just want to make sure that there are no negative effects in doing this. Also, can anyone with an R33 tell me if their yolk slides in all the way into the dust shield or does it sit like mine?

Thanks guys, I hope this isnt a little confusing :cheers:

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SteveL Mentor

SteveL

Posted
Posted

The RB25 yoke slides part way into the dust shield. You could machine the yoke as you say, with balance being the only thing likely to be affected (but probably not significantly).

A cheaper and quicker options would be to simply remove the dust shield, it's only a press fit to the back of the gearbox. You could then shorten the dust shield to suit. Leaving the dust shield off will expose the seal, but an occasional clean of the area will overcome any likely problems.

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