There are plenty of references to putting the long gear in the turbo transmission, but I'd like to hear from someone who put the turbo gear in the NA. FastTater above said he was going to do it - did it work? And the oiling issue Kevin mentioned would occur when 5th is not engaged, not when it is engaged. When it's not engaged the "shifting gear" rotates on the input shaft, and runs on a roller bearing. That bearing needs oil. How does it get it? On the 5th gear swap writeup you can see the groove in the shifting gear, and I would imagine there is a hole or holes feeding oil to that groove, to lubricate that roller bearing. I found an image of a turbo 5th on eBay, and it does not have that groove, so if someone here used a turbo 5th, did it end up welding itself to the input shaft, and how long did that take?

I haven't heard of any failures, and I know it's been done, but I don't know specifics of who, and how long they ran it. This is interesting info, though, and deserves some follow up. Can anyone confirm thye've done the swap, and/or have compared the gears?

The last swap I did was out of a 944S box (my street car at the time). I don't know which setup the S trans runs - it's not a standard N/A box, but also unique from the Turbo. Both the race car, and street car did fine with that swap.

Sterling wrote:

That's interesting. According to the shop manual - insert sheet 30-02a, So apparently you've been running a 5th without the oiling groove.

It worked for a couple of years without incident. the R&P went out on the trans eventually. My current trans has a short 5th out of an N/A. I think that the S gear is in another car now, being built.

I am interested in the gear set. Can you advise if it changes the ratios in the other gears? Thanks, Tom Joyce

No, it only changes the 5th gear ratio. all of the other gears and the R&P ration stays the same.