kasturbo

Is it possible to put a 951 ring and pinion back into a 944 S gearbox? Wouldn't this make the S box as strong as the 951 gearbox and give the benefit of the lower gearing? What else would need to be done? I already have the S box is the reason why I don't just buy an s2 gearbox.

Thanks all...

kasturbo

bump!

OZ951

Not sure about the answer to your question but I was just given a gear carrier housing with pinion and mainshafts in it from an unknown model of 944 transaxle and they are vastly different from the Turbo S (code AOR) Pinion shaft. Every gear in the turbo S shaft is wider, the bearings are different and the pinion gear is a lot more substantial in the Turbo S shaft as well.

kasturbo

Where do I find someone to just give me parts? lol..

Anyone know these inside and out?

Rob

Check out Dannos web pages on the gear ratios and transmissions

gearing

&

transmissions

I can't tell you if it's possible to swap in a 951 ring and pinion or not (but I think it is), but if you can, you would end up with all the same gearing as a 951. The main difference between the 2 boxes is the ring and pinion. The s2 transmission has a very similar final drive ratio to the S but should be stronger do to the number of teeth on the pinion gear (Note that the S2 pinion has the same number of teeth as the turbo).

Edit: There is an S2 ring and pinion on ebay right now with like 6 hours to go. No idea what the reserve would be though.

kasturbo

Thanks for the info Rob. I have a bid on that ring and pinion, but I have a feeling that the reserve is well over $500.

kasturbo

Let me ask this.....would it be possable to put the lsd out of the s box into my turbo box? Do I need anything special since the turbo box does have the cooler?

kasturbo

bump

Oddjob

Where did you find an S trans with LSD? Is it a factory LSD? Thats a rare option for an S.

I believe you can put the factory LSD out of an S trans into a turbo trans. If its an aftermarket unit like Quaife you should be able to for sure.

Are you going to do the swap yourself, or have shop do it?

kasturbo

My mechanic found the s box. We were thinking that it was an s2, but when I blew out the pinion I checked the code and sure enough it is an S. Bummer. ..

I would have a shop do the swap.

My first choice would be to rebuild the S box to the strength of a turbo box, but I don't know what all needs to be done to do that. Is it just the ring and pinion that were differant or were there other mods that made the turbo and s2 boxs stronger?

Oddjob

Just the ring and pinion as far as I know. The gear sets in the S should be indentical to the turbo.

kasturbo

Thank you. That's what I was thinking. Now I just need to find a good ring and pinion.

kasturbo

Let me ask this then. If the gear sets are the same then does that me the final drive is the ring and pinion? So If I would put a turbo ring and pinion back into the s box, I would have the same gearing as my turbo box? That wouldn't help me any as I want the shorter gearing from the s box.

Am I making since or just really confused now?

Rob

The gearsets (1st~5th) are the same in all three transmissions. The turbo-S has 1st and 2nd gear hardened (blasted?) to give them some additional strength but still have the same ratio. The final drive (ring and pinion) are the main difference between the three transmissions. Putting a turbo ring and pinion in a 16valve "s" tranmission basically makes it a standard turbo tranmission. If you want the shorter final drive, you really either the "s" or the S2 tranmission. The S2 tranmission does have a stronger ring and pinion than the "s".

kasturbo

Thanks Rob. That clears a lot up for me. So what do you think would be harder and cost more? Adding the lsd out of the s box to my turbo box or putting a new ring and pinion into the s box. What do you think the reason for failure was? Old and worn box or too much power for the weaker ring and pinion.