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simple differential question

m17davis

m17davis

New member
Some of you know that I fried my diff. So I'm getting one from the jy. My question is can I take any differential from any hd trans? I found two +04 grand prixs that have the gen v. so there fore they have hd trannys. Will they work? Mine has 34 teeth so it's 3.29?
 


I have swapped a diff from a regal to a GP, they were exactly the same minus the speed sensor connection was different. so my guess would be as long as you find a HD tranny with the correct gears, it should fit. just keep your VSS handy
 


All HD diffs are 3.29 in a 4T65 trans. Make sure you put the sun gear in the correct way and you'll be good.

ATSG manual says to put a big screwdriver or wedge in there and give it a whack... it's all good as long as it's a fast hit to make the compression ring compress.
 
BillBoost37 said:
All HD diffs are 3.29 in a 4T65 trans. Make sure you put the sun gear in the correct way and you'll be good.

ATSG manual says to put a big screwdriver or wedge in there and give it a whack... it's all good as long as it's a fast hit to make the compression ring compress.
Click to expand...

Not saying youre wrong, but arent the GTP's and GXP's HD diff's? which are also 2.93
 
HD's are all 3.29 diffs. The 2.93 is created by using a 33/37 drive/driven gear/chain setup at the other end of the trans with a 3.29 ratio diff. When you divide 3.29 ratio by the chainset 1.12 you get 2.93.

GM calls the diff the final drive which I originally found confusing. I was thinking final drive ratio was the overall ratio. It isn't.
 
BillBoost37 said:
HD's are all 3.29 diffs. The 2.93 is created by using a 33/37 drive/driven gear/chain setup at the other end of the trans with a 3.29 ratio diff. When you divide 3.29 ratio by the chainset 1.12 you get 2.93.

GM calls the diff the final drive which I originally found confusing. I was thinking final drive ratio was the overall ratio. It isn't.
Click to expand...
and I apologize for thinking you were wrong. fwd trannys always confused me with the layout, rwd just makes more sense to me and I have 100x more experience with rwd
 


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