Originally posted by coolcarlskic43
Donnie Drummond told me he's using the stck C43 Tranny in his 11.5 sec S/C C43/55.So it's more than capable to handle the power of a supercharged M113 motored car.The newer E55 compressor trannies are better though for the built extra Pwr from those F/I motors.

Yes speed shift can be adapted to the 98-99 C43 trannies.The 2k C43 already comes with the speedshift tranny and is the same in the E55.. Finally, most automatic trannies can get beefed up if you have the payola($$).
If I remember corectly.
Someone asked him before on another forums.
He has gone through couple transmission units before he went and used the V12 unit on his S'd C55.

C43 might be able to handle E55 power and torque, but Donies is a monsters, I don't think the tranmssion can handle those extra power.

After all, even with C36, C43, E430, E420, CLK430, C32 and 99 E55 I've seen some transmission failure, let alone when you uprate the power that much.


But if I'd swap to 5.4L engine from 2.8L I would get the matching transmission as well. But from C43 to 5.4L I would use the existing transmission first. If at the end it breaks so be it. Then times to get a new ones.


Regardz,