1979 GMC Sierra Classic c3500 Dually - The 1947 - Present Chevrolet & GMC Truck Message Board Network

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SCOTI

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Join Date: Apr 2001

Location: DALLAS,TX

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Re: 1979 GMC Sierra Classic c3500 Dually

Quote:

Originally Posted by JT_Trucks87

As far as I know the truck still has the 4:10 gears. I am running 235/85//16 on the back. I believe 4th is .75:1

That's what I calculated for (4.10's, 31.7" tire, .75 final trans ratio @ 2607rpms).

I was always hoping the combo would yield ~2500 @ 80 w/the lock-up converter dropping rpms down a bit. Still way better than 3krpm @ 70mph w/o the 4l80e.

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