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c4 shifting issue

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79pace:
I just bought a 79 pace car some one took out the turbo and put a c4 with a 302 in it. When you take off you have to shift it manually when it hits 3rd gear you have to back off the throttle a little it will then shift in to 3rd if you dont it slips. When you get it in 3rd it will not slip at all. Is their a good starting point to check? It has vac. line hooked up to the holly carb and the linkage is hooked to trans. Any help would be great. Thanks

Soaring:
Welcome to the site.  I don't know what you are talking about, but you may have a tranny with a limited slip, or it has some altercatiion that keeps it in 2nd until you manually shift it to third.  The C-4 only has three foreward gears.   

79pace:
What would i have to change to put a AOD pre 91 trans in it? Would the drive shaft length be the same?

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