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  1. KeithM

    Turbo350 w/shift kit slamming 2nd gear

    Hi, I just had a new trans installed in my 78GMC C15. I know it has a shift kit since it came out of a 67 Nova show car. It had a 3500rpm stall converter which was swapped out for one better suited for an old truck. My question is how can I get it to stop slamming 2nd gear? Would the modulator...
  2. KeithM

    New guy here!

    Thanks for having me. I picked up this 78 GMC last year and of course going about replacing parts and tuning it up. It has the 305 wturbo350 trans. It was never licensed for road use and spent it entire life on a farm and fairgrounds.

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