1979 C30 Transmission Swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Yamaharyder600 · 07-22-2015, 10:30 PM

Hello,
I have a 1979 C30 with a 350, th400, and 4.56 rear end gearing. Looking to swap to a 4spd auto to pickup the over drive. Right now I really cant do any highway driving due to lack of top end. The two options I am considering are the 4L80e and the 4L85e. I have access to either. My biggest question is do these two transmissions as similar as they are to each other share the same valve body? Looking to use a manual valve body and eliminate the electronic aspect. I have found the manual bodys listed for the 4l80 but not the 4l85. Can anyone clear this up?

07-22-2015, 10:30 PM	#1
Yamaharyder600 Registered User Join Date: Jun 2015 Location: Tarentum, PA Posts: 1	1979 C30 Transmission Swap Hello, I have a 1979 C30 with a 350, th400, and 4.56 rear end gearing. Looking to swap to a 4spd auto to pickup the over drive. Right now I really cant do any highway driving due to lack of top end. The two options I am considering are the 4L80e and the 4L85e. I have access to either. My biggest question is do these two transmissions as similar as they are to each other share the same valve body? Looking to use a manual valve body and eliminate the electronic aspect. I have found the manual bodys listed for the 4l80 but not the 4l85. Can anyone clear this up?



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