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Re: 4l65 tranny
Extra planetary gear is the big part, I think. But it's not just that, as I had my 4L60E upgraded to 4L65 spec at rebuild time, there are a lot of improved parts.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought
1969 Pontiac 2+2 427/390 4-speed Coupe
1969 Pontiac 2+2 427/390 4-speed Convertible
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