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Transmission upgrade needed
#1119321 Sun Aug 16 2015 06:38 AM
Joined: Aug 2015
Posts: 17
New Guy
I recently acquired a sweet 1960 GMC Flatbed 1/2 ton pickup... 99% original... I want to upgrade the transmission.. (currently 4 speed with granny gear).
I've ben told the T-5 tranny will bolt-up and be great, with my 235 Stovebolt.
Also, I'm wondering if I have a posi-trac rear-end, or limmited slip ?

Whatever you are doing, have a good time at it..... Ya gotta do it anyway... So, enjoy life !!!!
Re: Transmission upgrade needed
60GMCFlat #1119336 Sun Aug 16 2015 02:32 PM
Joined: Sep 2011
Posts: 2,014
Shop Shark
Hello and welcome to the forum. Many trucks on here, mine included, are enjoying the T5 transmission. My signature can take you to my web pages about the T5. It is not a good choice for any hot rodding but will be just fine for a daily driver. Several gearing options exist and the best one will depend on what rear diff gear you have.

Another option is the 3 speed with a solenoid overdrive (can't remember the name).

The trickiest part of the T5 is keeping the cable speedometer working. If that isn't an issue, then the T5 swap is easy. It can be made to bolt right to your bell without an adapter plate, use your current clutch package, shorten your drive shaft, cut a hole in the floor for the shifter and it's pretty much done. Here's a LINK to the T5 installation I did on my 1965 C10.

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