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  1. T

    400 trans acts like its in neutral

    I have a 383 hooked up to a 400 and it seems like the pump went out on the trans after rebuild I only got 75 miles out of it. The builder says that he thinks there is t enough clearance for the torque conv?... Behind the flex plate there is an external balancer. That's only and 1/8 inch...
  2. T

    388 with a 400 Tranny, need advice please!

    Thank you for the reply, I have already ruled this out... it is the tranny.
  3. T

    388 with a 400 Tranny, need advice please!

    I have an 86 k20 that I recently pulled out the tired crate 350 and put in a built 388. its about 425HP and about 460 torque. here is the issue, after the swap everything ran and drove great and then one day after driving the truck for about 15 mins I stopped at the store and the truck was...

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