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Post by moldy on Jun 17, 2009 11:10:25 GMT -5
After messing with the rear window channel rust I was bored so I decided to check what rear end ratio my Cutlass has.
I found a code on the right axle housing and found P308. I understand the P would stand for the manufaturer.
So does my cutlass have a Pontiac rear end with a 3.08 ratio?
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Post by Deleted on Jun 17, 2009 12:33:50 GMT -5
that would be a 3.08 ratio... open rear i believe. i think the posi ones had an "L" i think. pontiac rears have two ribs cast into the center section...
i found more info. on the right side of the diff cover stamped between two of the bolts should be a number as well. before that number is a letter, "A" would be a 3.08 ratio, and if its a posi it will have a circle with an X in it after the number.
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Post by moldy on Jun 17, 2009 13:55:24 GMT -5
oh okay thanks that is much more clear than my Olds decode/part interchange book.
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Post by moldy on Jun 25, 2009 19:08:37 GMT -5
I found a O or is it a zero? I guess it's an open rear end. The only ribs I found were horizontal ones that go from the ends of the cast axle housing. hopefully the drawing is clear enough. the ribs are in red.  |
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Post by bubbasz1 on Jun 25, 2009 20:21:49 GMT -5
Maybe this will help, Identifying GM 10-bolt Rearends: From 1964-67, GM A-body rearend housing dimensions measure 56.5 inches, from flange to flange. Total measurements with the drums in place is 60.5 inches. The dimensions are similar to the 1967-69 Camaro / Firebird, and 1968-74 X-cars and clones, except leaf springs were used. 1968-72 rearend housings measure 58.5 inches from flange to flange, and with the brake drums in place, the total dimensions measure 62.5 inches. The dimensions are similar to the 1970-81 Camaro / Firebird, and 1975-79 X-cars and clones, except leaf springs were used. The Oldsmobile 12-bolt has a 12 bolt cover and a 10 bolt gear, which measures 8.3". Axle shafts are common to the housing used, and due to the usual characteristics like overall length and spline count, the shafts only interchange with the housing that is used. (e.g. 12 bolt shafts fit other 12-bolts, and 10 bolt shafts fit other 10-bolts.) Rear spring mounting pads differed, in which 1964-66 rearends used a flat pad with a hole drilled in the center. 1968-72 rearends have circular spring mounting pads, which are 3/4" higher that the early flat pad. 1967 was a transition year, in which A-cars might have a 1964-66 style rearend, a 1968-72 rearend (which is wider and commonly available), or a "hybrid" rearend, which will have the 58.5" width, but with the early spring mounting pad and trailing arm brackets. Rear upper control bushing eyes differ, and the positioning of the bushing eyes will differ. 1968-72 rearend housings will have a 3/8" forward positioning, which is farther that 1964-67 rearends. 1964 was the only year that the rearend bushing are small, and any upper trailing arm ( from any GM division ) will fit 1964 rearend housings. If not go here, thats where I borrowed it from, there are pictures too.  Then say thanks BRO. www.442bro.com/ |
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Post by moldy on Jun 25, 2009 20:57:09 GMT -5
I am trying to figure out if the rear end is a Pontiac or not.
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Post by RAM Z on Jun 25, 2009 21:14:52 GMT -5
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Post by moldy on Jun 25, 2009 21:54:10 GMT -5
I just crawled under the car a few minutes ago to make sure I wasn't mistaken but the ribs say it's a Buick.. But the stamping on the axle tube stamped P 308 say it's a Pontiac.
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Post by moldy on Jul 2, 2009 17:17:31 GMT -5
Anyone know what type of rear end my car has?
It looks like the Type(B) in the above photo but has P 308 stamped on the axle tube.
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Post by 64b09 on Jul 3, 2009 0:14:57 GMT -5
Mine from my 64 was the same. P308 and the single rib. Sitting outside my garage now because an 8.5 with 3.42s is going in.
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Post by moldy on Jul 3, 2009 15:28:47 GMT -5
Oh I thought it was some freak.
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Then say thanks BRO.
