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The t-56 has top gears of 0.6:1 (the more common ratio) and 0.5:1 which is kind of rare.
I think swapping an auto with a 0.7:1 top gear for a manual with a .75:1 top gear just won't give you the gain's you are looking for with out also doing a rear gear change.
You can do some light towing rear. My firebird, has the 7.5 inch 10 bolt rear and I tow with mine, only about up to 800lb.
But eventually I will roll a ford 9 inch up under there.
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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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