Auto to 5-Speed Conversion (Silver Sport Transmission Tremec TKX) Project Plus

[MoparCarGuy]

Word of caution on exhaust selection. I found severity of angle plus length of the Tremec on a lowered Challenger left my long tube TTIs with only 2.5 inches of ground clearance at the flange. Mid car placement left it very vulnerable to speed bumps so I changed to TTI shorties. Even then the head pipes off the shorties barely got me over speed bumps. Next step would be custom bent head pipes as there is plenty of room upwards. Might not be a problem with stock height suspensions. This is not TTIs fault but rather a trans issue that could only be solved by cutting out the crossmember that crosses over from the torsion bars. They do this on the 6spd but it’s not part of the 5 speed process.

I have already finished the conversion. The TTI 3” exhaust has been on the car since 1999. TTI discussed the fitment with me before the start of this project and told me they have not changed their systems since they began selling them. I had no exhaust issues and the TTI headers fit extremely well.
The thread will continue but here are a couple of header/exhaust photos.

 

[Drivun]

Nice fit. My build was 10 years ago with a tko600. Called TTI and they said it was the fit of the tremec, so we tried the shorties. Looking at American Powertrain pictures, from the top the TKX is much narrower than the 2 forward big square access panels on the TKO, probably allowing you to get it up higher than I could. Glad the TKX solves the problem as would have preferred keeping the longtubes. Im also enjoying the TKX improved shift quality in my 83 Mercury Capri.

TKO TKX comparo

 

[MoparCarGuy]

Nice fit. My build was 10 years ago with a tko600. Called TTI and they said it was the fit of the tremec, so we tried the shorties. Looking at American Powertrain pictures, from the top the TKX is much narrower than the 2 forward big square access panels on the TKO, probably allowing you to get it up higher than I could. Glad the TKX solves the problem as would have preferred keeping the longtubes. Im also enjoying the TKX improved shift quality in my 83 Mercury Capri.

TKO TKX comparo

Yes, a very different setup with the TKX. The engine is still tilted downward about 3.45° so driveshaft angle and rear pinion angle were corrected to cancel out.

 

[Flchallenger]

So what was you angle on you trans. Was it down 3.4 degrees and did you raise the rear end angle 3.4 up to match? I have the same trans but can't get it any higher up than 2 degrees down. Factor is supposed to be 2 degrees up and the rear 2 degrees down. I have had a lot of vibration problems with mine. Have a drive shaft with double u joints to compensate. Also are you running the 3.5 inch long tube headers? Then went to the shorties? I have schumaker shorties on mine but are very close to the starter.