Just wanted to share a little information with everyone. I have installed several shift kits in my 87 GN over the years. First one was a Fairbanks, could not tell a difference. Second was the new version Transgo, it just plain sucked. Further more when I was ready to remove the Transgo kit I had to buy a new valve body as a result of drilling holes in the valve body from Transgo recommendations. Next I went with a shift kit from Mike Kurtz at Century Automotive. This was an old Transgo kit that he added some extra mods to. This worked the best out of the previous that I had tried but still was not right. I had a 2-3 bind up at light throttle, and a 2-3 flair at WOT. The car would shift hard at light throttle but as soon as I stepped into a little bit of boost it would not shift firm. Also when slowing down as the car down shifted it would get a bad clonk. I just sort of put up with this. Well several years later I decided to bump the horsepower up a bit. I didn’t trust the trans that I had built so I decided to let a professional do it; I took it to Mike Kurtz. When I got it back from Kurtz, it shifted worse then it did before I took it to him. Took it back and he replaced the Valve Body. This helped but still was not right. I then went into it myself and tighten up the direct clutch pack. This helped a lot but still was not right. Next I tore back into it again and installed the PTS Extreme billet forward drum, PTS Wide band and Billet large servo. The trans did a little better but still had the same problems. I then contacted Chris @ CK Performance, he sent me a stock plate, heavy 1-2 accumulator spring, heavy line bias spring and a blocked off center support bolt. To his recommendations I did every thing that he suggested including dual feeding the direct clutches. I put every thing back together and wholly sh!t what a difference this made. It would now shift hard into 3rd at WOT and don’t get that terrible conk when down shifting. After doing this I still was getting a bid up at light throttle on the 2-3 shift, so Chirs then had me remove the PTS billet servo and install the stock one. This made a big difference and the car even shifts into second better with the stock servo (firmer). I now was only getting a very slight hint of bind up so Chris then had me restrict the Direct Clutch feed hole and open up the 3rd acc hole some. Bingo this fixed it. This thing has never shifted this good!!! It shifts with a light bump when cruising; when I step into about 5-6 psi of boost it chirps the tires on the 1-2 shift and hits the 2-3 shift very firmly. The 2-3 WOT flair is gone and the bind up at light throttle is gone; even when I set the car up in race trim with slicks and high boost making approx 600 HP it still shifts firm. (Tire chirping shifts) Chris really knows his stuff!!!!!!! Thanks a lot Chris.
Steve Burnsed
Steve Burnsed
Haven't had a good trans in my car since I've owned it (91) Tried and tried and tried just no one can seem to get em to shift hard behind big power.
