Re: New owner of 1966 gmc
You didn't say how you planned to use the truck. For general purpose driving with occasional hauling not exceeding the truck's GVW, I like the T-5. If an automatic, the 200-4R. Both of these transmissions have overdrive, which will make highway driving much more pleasant. If the truck is presently set up for a manual, the T-5 will be a lot less work to install than the 200-4R.
If you have a more specialized usage in mind, please describe it.
Ray
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