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**LockDoc** · 12-30-2012, 12:33 AM

Tommy,

Usually if they came with the standard axle ratios there wouldn't be anything on the SPID. If they had anything other than standard it would be listed. My '69 C10 burb came with a 327 engine, th400 trans and a 3.07 rear. I can tell you this, the 3.07 is too tall of gear for the 700r4. It will make the trans overheat on the road. I have to drive mine in 3rd gear with the 2004r OD transmission, I can't use the OD. I will be installing the 3.73 Posi I have the first thing next spring.

LockDoc

12-30-2012, 12:33 AM	#2
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 26,068	Re: SPID Axle Question Tommy, Usually if they came with the standard axle ratios there wouldn't be anything on the SPID. If they had anything other than standard it would be listed. My '69 C10 burb came with a 327 engine, th400 trans and a 3.07 rear. I can tell you this, the 3.07 is too tall of gear for the 700r4. It will make the trans overheat on the road. I have to drive mine in 3rd gear with the 2004r OD transmission, I can't use the OD. I will be installing the 3.73 Posi I have the first thing next spring. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 12-30-2012 at 12:44 AM.