best buit 4l60e
if you buy the yank you can have it sent to FLT & they will test it on there top of the line trans dyno with your new trans.

good luck!
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Plus, it's the 4L60E we're talking about here. Even if you do get it right the first time, there's still the potential for problems because these transmissions weren't tough enough even from the factory... There are a lot of tricks builders use to overcome this that no DIYer will know.
Anyway, its up to you, OP

RPM Transmissions gets my vote, by the way. They're a sponsor with good customer service and a great reputation.






