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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> grand national 8.5 ' gears '
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Topic Review (Newest First)
01-05-2013 03:09 PM
Originally Posted by sscanrun View Post
I got the rear end from a Guy he said it was a 390
did you take the cover off and count the teeth or look for the stamp that would tell you, or turn the drum and count the yoke revolutions?

You could already have 3.42 and not know it.
01-03-2013 06:03 PM
sscanrun I got the rear end from a Guy he said it was a 390
01-02-2013 01:28 PM
gearheadslife what gear in it now??
if the g.n was pre 2004r it might be 342
01-02-2013 05:53 AM
big gear head GM 1/2 ton trucks with the GU6 code from '82 and up.
01-01-2013 09:49 PM
sscanrun I'm just looking for a 3:42
01-01-2013 08:31 PM
sscanrun What's the easiest car too find
01-01-2013 08:06 PM
big gear head That's the most comon gear for the 8.5. They were installed in about a million GM 1/2 ton trucks from '81 up and many second gen Z28s.
01-01-2013 08:03 PM
sscanrun I'm just looking for a 3:42
01-01-2013 05:40 PM
big gear head Yes, there are a lot of gears that will fit that rear end. It's the corporate 8.5 that was used in many GM cars and trucks from '71 and up. There are gear ratios from 2.41 to 5.13 for the 8.5. You can also upgrade it from 28 spline to 30 spline axles with a 30 spline Eaton Posi and after market axles.
01-01-2013 05:05 PM
grand national 8.5 ' gears '

Are their any interchangeable gears that would fit a grand national 8.5 ?

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