need transmission help

[Suck fumes]

if your crafty you can just undo one header and get the gearbox out without yanking motor. But I’ve never had to deal with it cause the 3650/clutch never give me problems. I have urethane mounts. If you go 3650 make sure you run Royal Purple ATF and dont fill it till it runs out the fill hole. I usually have a half a pinky room when putting finger in fill hole to feel where fluid is. There is an actual fill spec on google somewhere. Don’t run redline or any of the manual synchromesh garbage.

[Sook]

I have had good luck with my used 3650 in my S197 track car.

The 3550/TKO in the CMC car shifts terrible compared to a T5. The mechanism in the 3550/TKO is complete junk. They use massive shift lugs with a very sloppy mechanism. I guess a plus side is that it probably won't wear out since their all iron. A common mod is to blue print these parts to tighten them up. Definitely setup for drag racers bang shifting the thing, which was a point of failure in drag race application T5s.

The 3rd gear on the front of the output shaft is what always breaks in the T5 and TKO boxes (for me at least). I think as the box heats up and and becomes longer. The shafts can move and bend more reducing tooth engagement. Enough cycles like that and it'll pop some teeth off. Real race application transmissions have a little dog-bone thing that joins the two shafts together so they can't spread as easily. I did split an output shaft in a T5Z at hallett three years ago and it ended up splitting the entire case.

Jerry, is your drive shaft in good shape? Vibration through the output shaft of the trans could cause issues. The output shaft is also very long, making it more susceptible to vibrations from 'low speed' things like the drive shaft.

- Josh

[mach1]

Jerry, have you checked your bellhousing to crankshaft alignment? If all of your problems revolve around the input shaft maybe the issue is there

[ShadowBolt]

Jerry, have you checked your bellhousing to crankshaft alignment? If all of your problems revolve around the input shaft maybe the issue is there

I had a machine shop make me some offset dowels so I could dial in the alignment. That is not the issue but I assumed it was when I lost the first transmission after starting to use the Quick-Time bellhousing.

JJ