#1  
Old 08-01-2022, 05:13 PM
myam myam is offline
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Default stock rearend

What is the type of rearend came stock on 75 GA ?

  #2  
Old 08-02-2022, 09:59 AM
sport coupe sport coupe is offline
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Default Stock rearend

Attaching a couple of diagrams. Learned something new without looking for the axel code. From my build sheet. The options description shows a GM8 AXL 2.56 ratio. Looked up the above build sheet codes on code 11 it shows *CH. Matched to an 850 ring gear in 2.56 ratio positraction.
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  #3  
Old 08-02-2022, 11:37 AM
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camerjeff camerjeff is offline
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I was going to say it should be a 8.5" axle, but lists that sport coupe attached pretty much covers it.

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  #4  
Old 08-03-2022, 02:17 PM
myam myam is offline
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Cool rear end

well i'm a michigan car so it's 2.56

  #5  
Old 04-13-2023, 01:18 PM
fireprix fireprix is offline
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I know this is an older post but I have owned two 75 Grand Prix model LJ. Each was equipped with a 400 4BBL and a 2.56 open differential. The first one I had in the mid 80s had an 8 1/2” 10 bolt cover and carrier with 9 1/2” drums. If memory serves me correct it was built late in the model year. I presently have one that is an early build, I think November 74 and it has the 8 7/8” 10 bolt cover 12 bolt carrier and has 11” drums. This is what my 75 Pontiac service manual says they all should have. I have no reason to suspect the rear in the one I had years back was ever replaced. It seems during these years they put in whatever was available. This must be a known fact as when I bought a set of rear brake shoes they asked if they were 9 1/2” or 11”. I’m guessing an easy way to know what style of rear axle is what size the brake drums are.

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