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Old 04-17-2017, 02:33 AM   #1
87Skier
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Join Date: Mar 2014
Location: Corvallis, OR
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How much spline engagement do I need?

I'm working on mating a 6L90 to a np205. I have the short 29 spline transfer case input, and the shortest 4wd 6L90 output shaft. After I get done cutting everything to length, I'm probably going to have about 1.5" to 1.75" of engagement of the transmission into the transfer case. I haven't found anything out there whether this will be enough.

The truck won't see a lot of abuse and it won't be a high hp/tq build or anything, so I'm thinking it will be alright.

What do you guys think?
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1972 GMC Jimmy Custom 4.8L (L20)/6L90E/NP205
1989 Chevy Suburban V2500 350/Turbo 400/4.11 gears
1996 Chevy Suburban K1500 350/4L60E
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