ctrombetta

I also live in Guatemala and I beleive that finding the right shop with experience with the 915 is nearly impossible. Very few mechanics have had a chance to work repetedly on this transmission so experience is far between. Most problems shifting with a 915 can be solved externally. I have a close friend with very extensive mechanical experience and the correct mind set (doing things by the book and with the correct tools) and with no time constraits. I just purchase a 1985 911 coupe with 49,000 miles and a new clutch, with similar transmission issues. We wanted to start from the basics, after 250 miles, checking the correct adjustment of the newly installed clutch, followed by replacing shifter bushings and performing the shift likage adjustment. We later installed a Seine Systems Gate Shift Kit and polyurethane engine and transmission mounts. All this in theory would isolate any problems, if any with the transmission. The change was dramatic. The Seine Kit takes away the guess work and makes drinving all that much more enjoyable. Great shifting all the time, with the ocassional strained, down shifting to second. except when the gearbox is cold (16-18C). Syncros here get to speed when oil is cold and decided to do some research on transmission oils. I replaced my gearbox oil to Motul 300 75W90 LS synthetic somewhat reluctantly as Motul rep promise a no charge replacement to a Motul 300 75W140 or 90 PA if not satisfied. Unfortunately their is no Swepco 201 or Redline here in Guatemala. Drove 200 miles shifting primarily between 3,4 and 5. Transmission works well but somewhat slower as syncros have a harder time slowing gears up. They need some friction for them to work properly and the Motul 300 has a good dose of friction additives. Too slippery as I suspected. Will keep you posted what results from changing to a 90 PA (Mineral) or a 300 75W140 synthetic.