I would run a GM T-5 (non-world class) on 4.10 gears with 30 or 31 inch load range C tires.
Also auto transmissions put off a lot of heat, they have external coolers.
Any heat produced by the system is just power that never made it to the rear wheels.
I have had several T-5 transmission vehicles, I could always drive them long distance and put my hand on the transmission afterwards, inferred temp gun never registered over 140'F on one. It also didn't have any kind of cooling system.
Dont try that with an auto transmission.
You don't need "some sort of electrically actuated shifting", you can shift a standard transmission with out the clutch as long as it has syncros. No one showed me how to do it, I read on the internet that it could be done so I tried it and it works.
I have never met one that I couldn't at least up throught the gears with out the clutch.
Still set on using an auto?
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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