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Does the 700R4 have any electric plugs that need's voltage for it to operate?
Hi Cheyenne1010:Assuming your drivetrain is all original from factory, it sounds as if you have a rear end ratio that is optimized for towing or hauling with your TH350. As others have said, the first thing is to establish what your rear end ratio is right now. If your truck is simply a grocery getter and daily driver to work, you could possibly simply change out your rear end ratio to get your engine to slow down at highway speeds. Be aware that this may not allow your engine to be at optimal rpms for towing or hauling big loads...but maybe you dont care about this. I think the rear end gear change out may be the simplest change. As VZ has said, the 700R4 may be a solution as you get 4 gears now, but you still need to compare what the ratios are in this trans with your TH350 and what you have in the rear. Be aware that the addition of a wire may not be your biggest mod: I think the driveshaft between the TH350 and the 700R4 are different just like the driveshaft between the TH350 and TH400(700R3) are different. If you let us know what your rear end ratio is, rear tire diameter, we can probably help you figure out what your options are.Regards,Henry