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Re: 3.9L Cummins/Isuzu diesel swap in 89 Suburban
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Originally Posted by 87Skier
Why not use the 4L80? Personal preference? I was thinking of using it because of the cost of finding a manual transmission and having to convert my auto to manual. I really like driving manual transmissions though.
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I don't feel that it's a reliable choice behind a 12 valve UNLESS you get it built to handle it. First generation 12s put out 400 lb ft of torque and if I remember right the 2nd generation put out 450+, the 4L80E is rated for ~350 lb ft stock. It might last a while if you are extremely nice to it though.it should do ok behind a 3.9, but once again,you have to be easy on it unless you get a built one.
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1979 GMC Sierra Grande Crew Cab C25, 454/TH400/4.10-Project truck/ DD
1985 Chevy K5 Blazer 700r4/4.10/8 lug- in search of new engine
1993 GMC Sierra K1500 4L60E
2007 Suzuki Forenza- her DD and the family vehicle
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