Re: Transmission Modifications/replacement

Posted by Tim Cole On 2012/7/5 13:21:19

Dear Barry:

Given your car is already modified, keeping the Ultramatic doesn't make much sense. By the time you get through a rebuild and transport costs you have exceeded the Torqeflite conversion.

I would avoid the 4L60 GM because the car is not really up to standards for that level of performance. You don't want to crack up because the car gets away from you.

I never had anybody come to me to fix their twin-ultramatic D range, but it is mostly a valve/timing problem fixed by following the TSB's. I always used High range, but if you want fast acceleration then the 727 Toruqflite is the way to go. Years ago I attended a presentation by George Hamlin and he was very enthusiatic about the conversion. The only negative is I have not seen a PRNDL for the kit.