i just got my new trans back Sunday. I wanted to go to an overdrive trans and was trying to decide between 2004R 700R4 and 4L80E. after visiting with a friend that owns a trans shop I decided on the 700r4. he is an avid drag racer and a pontiac enthusiast. He prefers the 700 because of the larger internals. And the cost of the E controller and build ruled out the 4l80e. He has built a few for guys at the track that have been in the mid 10 sec times. He gave me the idea of the JW ultra bell mod saying he has done a bunch on power glides but always wanted to try it on a Pontiac 700r4 and if I bought the bell housing he would do the swap. He cut off the factory bell housing and then machined it flat on the mill. The new one bolts threw the pump housing it's a dual pattern BOP and Chevy. I also found a tail shaft housing from an 86 Chevy caprice that moves the trans mount to the same location as my th400 cross member. So other than a new drive shaft it's pretty much a bolt up swap. I went with a 10" jim hand special Contential torque converter none lock up. This converter will act like a stock converter until you find traction and apply some big torque to it then it well flash around 3000. As far as the internals they are from a 91 700r4 and newer 4l60e. Gm made a lot of improvements threw the years and much of these parts are interchangeable. Trans go supplied the valve body modification kit as well as the none lock up valve. Now in a few more weeks we will see how well it holds up to 600 ft/lb the new motor should make.
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