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I wouldn't try to put a coolant jacket around the transmission at all. Transmission cases are die castaluminum. Die cast aluminum is nearly impossible to weld with out cracking it.
If I were going to do it I would replace the fill and drain plugs with 90° barb nipples and pump the oil to a heat exchanger and through a filter too then back to the transmission with a marine oil pump.
I will likely be doing this on my firebird six-speed transmission at some point.
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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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