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-   -   grand national 8.5 ' gears ' (http://www.hotrodders.com/forum/grand-national-8-5-gears-227845.html)

sscanrun 01-01-2013 05:05 PM

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

big gear head 01-01-2013 05:40 PM

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.

sscanrun 01-01-2013 08:03 PM

I'm just looking for a 3:42

big gear head 01-01-2013 08:06 PM

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.

sscanrun 01-01-2013 08:31 PM

What's the easiest car too find

sscanrun 01-01-2013 09:49 PM

I'm just looking for a 3:42

big gear head 01-02-2013 05:53 AM

GM 1/2 ton trucks with the GU6 code from '82 and up.

gearheadslife 01-02-2013 01:28 PM

what gear in it now??
if the g.n was pre 2004r it might be 342

sscanrun 01-03-2013 06:03 PM

I got the rear end from a Guy he said it was a 390

TexasT 01-05-2013 03:09 PM

Quote:

Originally Posted by sscanrun (Post 1630265)
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.


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