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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Anyone know what a YD1 Trailer Axel is exactly?

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Anyone know what a YD1 Trailer Axel is exactly? Empty Anyone know what a YD1 Trailer Axel is exactly?

Post by 7irish1 Tue Mar 27, 2012 6:14 pm

Found my 74' Monte build sheet behind the drivers door panel! Trying to figure out the rear end. The build sheet states it has a "3.43 axel ratio" which I understand and also "YD1 Trailer Axel"...what is this other than heavy duty? Limited slip? I can't find anything online. More a want to know rather than need to know.

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Post by 77mali Tue Mar 27, 2012 6:36 pm

This may help you further with the build sheet codes. The YD1 was a $12.00 option in 74...maybe the car was born with a trailer hitch? Not 100% sure but the 2.73 & 3.08 ratios might be more common.

http://www.g3gm.com/Chevrolet-Rear-End-Codes-h25.htm

http://www.g3gm.com/Chevrolet-Option-Codes-h24.htm

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Post by Mcarlo77 Tue Mar 27, 2012 6:56 pm

RPOcodes.com describes it as a 7.50" ring gear - Saginaw (whatever that means!)

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Post by 77mali Sat Mar 31, 2012 7:04 am

7irish1 wrote:Found my 74' Monte build sheet behind the drivers door panel! Trying to figure out the rear end. The build sheet states it has a "3.43 axel ratio" which I understand and also "YD1 Trailer Axel"...what is this other than heavy duty? Limited slip? I can't find anything online. More a want to know rather than need to know.

Forgot to add that "G80" was the RPO code for Posi traction rear.
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Post by 7irish1 Sat Mar 31, 2012 9:13 am

Thanks guys for the replies, but I'm trying to find out how to decifer the "Trailer Axle". The trailer hitch it still has was factory installed and on the build sheet as well. I understand it except for a description of the axle itself; i.e. Tow capacity, etc.
Since it was built with the ability to tow, I'm planning on building a dirt track Monte to tow it to the track with: )

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Post by texan01 Sat Mar 31, 2012 10:00 am

Mcarlo77 wrote:RPOcodes.com describes it as a 7.50" ring gear - Saginaw (whatever that means!)


The 7.5" didn't appear till 77 in the B bodies. Unless someone swapped in a Vega rear end.

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