I show:
PH = Chevy 3:55 10 bolt posi...
Check again and possibly post a pic..
Junior Member
I have a 1970 riviera with a 12 bolt rear end. The code on the underside is PH. What ratio would this be?
Senior Member
I show:
PH = Chevy 3:55 10 bolt posi...
Check again and possibly post a pic..
David Walker, BCA #30832
"GS By The Numbers" Cast, Stamped, Part No., 1970 Field Manual $45.00
"GS By The Numbers" Cast, Stamped, Part No., 1971 Field Manual $45.00
"GS By The Numbers" Cast, Stamped, Part No., 1972 Field Manual $45.00
"V.I.N.-Trim-Paint" By The Numbers, Buick V.I.N., Body and Interior Color Codes 1950-1975 $45.00
Atlanta Buick Specialties,LLC.
Junior Member
I went out and scraped all the grunge off the cover and your right it's a 10 bolt. I thought I read that all 70 Riviera's had 12 bolts on them. If not would it be correct for this car to have a Chevy rear end on it? It is not a GS so it would be great if it is a 3:55/1 Posi!
It has a 9 3/8ths. inch ring gear. 10 bolts on the cover & 12 bolts holding the ring gear to the carrier. Unless it's a "GS" it most likely came with 2.92 or 2.72 gear ratios stock from the factory. It's DEFINATELY NOT a Chevy rear.
Tom T.
Tom Telesco
Classic and Muscle Automotive
12 Cook St.
Norwalk, CT 06853-1601
Day Phone 203-324-6045 ET
NailHead Mini-Starters '53-'66
Adjustable Roller Tip Rocker Arms - All NailHeads
Custom forged pistons
Front & rear neoprene seals
Many other "Nail" parts
"If I can't get it, you don't need it!"
Junior Member
Tom, Thanks for answering my post. Your right, I pulled the cover off it's a 9 3/8 with a 2:72 ratio. It does have a PH code on it. Would that be correct for this car?
Senior Member
I found a rear end for my 52 that sounds like yours. I found mine in a 73 Caprice cop car 454 powered. Five hole by 5 inch. Ten bold cover and 12 bolt ring gear. Very heavy built 31 spline axles. Mine has a VE code. This one is a 3.42 ratio posi. Does anyone know if the higher gears like a 2.72 ratio fit my carrier?
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