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Old 09-15-2008, 01:56 AM   #1
BBGMC
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New 1975 GMC to me

I just bought a 1975 GMC 4X4 Truck and was wondering what gear ratios my axles could be they are DANA 60 in the rear DANA 44 up front small block truck 3/4 ton wuth a manual trans also I was wondering what the trans could be any info is greatly appreciated Thanks
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Old 09-15-2008, 02:07 AM   #2
Prong
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Re: New 1975 GMC to me

The tranny should be a SM465. As far as gear ratios go, I would guess it would have 4.11's, although you could have 4.56's or 3.73's (I think they were available in the 3/4 tons).

Last edited by Prong; 09-15-2008 at 02:08 AM.
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Old 09-15-2008, 03:46 PM   #3
BBGMC
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Re: New 1975 GMC to me

Is there a site that I can go to for this year of truck to look it all up and is the trans a Saginaw or a non gm brand?
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Old 09-15-2008, 08:41 PM   #4
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Re: New 1975 GMC to me

Check this one out. http://73-87.com/ It belongs to one of our board members here. All you ever wanted to know and then some. If you can't find what you're looking for drop Jeff an e-mail. He will help you out. ...Joe
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