The reason for swaping to a five speed is not just for lower final drive revs, but because the driving experience is more to my liking. The four speed is okay, but first is way too low, and by today's standards the shift itself leave a lot to be desired.
To work in our car without major modifications, the transmission must be narrow, be a top shifter, and have an input shaft long enough to allow for an adapter plate between the box and the Pagdoda bell housing. There are only two candidates that I have found likely so far. The Getrag 265 like in Fernando's and the T-5 which has been done by a shop in California.
There are three versions of the G 265 and only one is acceptable. It was in the BMW 5 and 7 series cars of the early 80's. By the mid 80's they had gone to electric speedos. In the US, they are hard to find because almost all of those cars sold here were automatics.
If you are in the UK, where the Getrag boxes might not be so rare, there is a fellow in England who has done the swap once and is threatening to make kit.
The Borg-Warner T-5 comes two versions, in four different ratios sets, with different shifters and tail shafts. It was manufacured by the millions, and is still available new from Tremec. Any tranny shop anywhere will likely be able to get parts for decades. I'm getting close to working out all the details and I'll be back when I have hardware to play with.
If you can't wait, I welcome those interested to contact me off-line.
