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Re: Trans and rear end help
The TH350 will bolt to the six, however you won't be able to run 70-80 mph comfortably with that trans.
The highest (lowest numerically) rear that is reasonable would be 3.07, but that still won't get you there. You're going to need to go to a TH700R4 or other 4-speed auto with overdrive 4th.
You might want to look at getting a 5-speed that has an overdrive. It might end up being cheaper than converting to the 4-speed auto.
Some people don't think anything of converting auto-to-manual and vice versa, but after doing it a couple of time myself, I keep the truck with the type of trans it came with.
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