Re: The fuel efficient GMC V6
I don't know what your budget is but the Ranger box might be what you're looking for. It fits between the bell housing and transmission so all it does is handle engine torque. It is available in either under or overdrive however they are about nonexistant at the moment.
The biggest downside is that you have to move the SM420 back so there must still be room for the shifter, and the transfer case lever in the more rearward position.
Another option is finding the GMC V6 to Chevy automatic parts and using a TH700R4 or TH2004R behind it.
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