Rear Diff ID

[blublazn86]

In my quest to decode the rear diff in my 87 R10 2wd square body I have hit a wall!! The RPO tag has a code of Y03 which shows to be a 7.625 ring gear Saginaw/American axle but I can't find out any other info on what the factory gear ratio would be. I got the casting code off the axle its self and it reads as follows BS3 G093 and there is a casting code on the center section or (pumkin) that is C307. Every where that I have looked I have came up empty handed so I am asking for the help of my fellow bowtie builders out there. Any and all help is apperciated!! Thank you!!!

 

[dhamp]

Search on here for RPO codes. It'll tell you what ratio it had from the factory. If you're not sure the orig gears are still in it, you'll need to either crack it open or do to the old Spin the Wheel test.

 

[RetroC10Sport]

BS3 - C10 1984-87 3.08 non-locking

http://www.gmsquarebody.com/forum/showthread.php?t=4185

 

[HotRodPC]

This rear end isn't a GM corporate 10 bolt? Is this a foreign truck? I was not aware of any of them coming with a 7.6in ring gear.

 

[bucket]

This rear end isn't a GM corporate 10 bolt? Is this a foreign truck? I was not aware of any of them coming with a 7.6in ring gear.

I'll bet that description was found in a google search or something. I'm sure you already know, GM tends to recycle the codes and that description is probably for an Astro or Colorado or something.

 

[HotRodPC]

I'll bet that description was found in a google search or something. I'm sure you already know, GM tends to recycle the codes and that description is probably for an Astro or Colorado or something.

I was hoping maybe it was a foreign truck like a Dana 44 Rear end, but I know that's not a Dana 44 rear end description.

 

[blublazn86]

Thanks for the info guys...it is appreciated!!!!

 

[HotRodPC]

Thanks for the info guys..

That's what we do !!!

.it is appreciated!!!!

Oh Goodie, so that means everyone with input got Reputation credit???

 

[89Suburban]

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