Thread: 4l80 adapter
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Old 09-04-2017, 02:33 AM   #5
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Join Date: Mar 2014
Location: Corvallis, OR
Posts: 668
Re: 4l80 adapter

I looked at putting a 4L80 in my 89 suburban. I read that the adapter in my truck bolts to the 4L80 but a spacer is needed. What does your adapter look like? I thought all turbo 400 had the same output flange and shaft as the early 4L80's.
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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