Re: 79 C10 swap with L92 with 6L90
I know old school 3 speeds and especially powerglides rely on a loose converter to work their magic, but I'm thinking these new 6 speeds and the way the ratios are, you could get away with a tighter converter than normal.
For example a Turbo 350 has a 2.52 first gear, but the new 6 speeds have a 4.027 first gear. With 3.08 gears, the TH350 has a 7.63:1 starting line ratio, and the 6 speed has a 12.4:1 starting line ratio. To get the same starting line ratio, the Turbo 350 would have to run a ~5.51 rear end gear!
In *theory* the 6 speed and stock converter would feel much better than a 3 speed and stock converter, just because of the more ideal gearing.
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1977 GMC Sierra Grande
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