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Re: how hard to rebuild 4l80???
I think you just need to find a different transmission guy.
700R4's can handle lots of power, but the trans only ends up as strong as the guy has skill to rebuild them. Also, the TV cable must be properly adjusted, and the bracket must have the correct geometry. It doesn't hurt to initially hook up a gauge and check the line pressures while driving to verify that everything is adjusted and working properly with that expensive of a transmission.
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1977 GMC Sierra Grande
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