I bought an old rod this summer that has been sitting for at least 20 years. It's a 39 Oldsmobile coupe ,the motor is an early 70s 350 Olds with a 400 transmission. We are trying to figure out what kind of rear end is in it. The 39 Olds (to my surprise) came from the factory with a coil spring suspension setup. The housing that is in it has been a leaf spring setup changed over to a coil spring. You can see the old mounts on the rear end. The cover is a 10 bolt that bolts on the rear. Bolt pattern for the rear is small Ford pattern 4 1/2 ?. (We tried a wheel we have) We pulled the cover and found the following on the ring gear: U.S.A. C7AW4210-C 42-212 That's all, no other marks. Anybody got any ideas? No pics yet. Thanks!
If it is an 8.8 Ford and was originally a leaf spring axle, it is probably from an Explorer or Ranger pickup. You sure about the number on the ring gear? I ask because a C7A part number indicates a '67 passenger car; they all had nine-inchers back then.
Well it's a '67 Ford Full Size Car, and the 3rd member bolts into the housing with 10 bolts. Ford didn't use anything other than a 9" in the '67 Full Size cars. C= 1960's 7= 1967 A= Full Size Car W= Rear Axle
Here's a pretty handy ford parts page. http://www.classicmustang.com/decoding_part_numbers.htm Ford did offer a WER style 8.5 or 8.75 in the base galaxies in 1967. 10 bolt cover.
Well he said 10 bolt cover so ford 8.8 but if its a 10 bolt 3rd member my CD_ROM says 2.75 ratio Ford 9 inch 1967 as the man said.
dana 44. (44 stamped in the web corner) Could be the 7.75 or 8.75 as mentioned, I suppose. A pic would verify. FWIW, the ring gear could be used throughout several years. So it could even be from a granada, versailles, monarch. with a 2.75 gear ratio. 4210 is certainly the ring gear #
ah, but some pickups did and could have interchanged the axles. I'm still waiting for pics, quite honestly. More I think about it, it could be an 8.75" http://www.fordification.com/rearends-ford06.htm
I thought they snuck them into some early-mid 50s wagons? sort of more on topic.... I do remember seeing a few late 60s full size fords with the bolt on rear cover when I worked at the junkyard, but it's been a long long time ago
later r&P installed....maybe? That link I posted shows the cars that had the 8.75 non removeable carrier of which many were later 60's.
So the ring gear is interchangeable from a 9" to a Dana 44? C7 on the ring gear means '67. AW means Fulsize Rear Axle. Granada & Monarch came out in '75, Versailles in '77. I'm not positive on anything here, just referencing the numbers. Then again, wv still hasn't verified if he meant 10-bolt cover, or 10-bolt 3rd member...
I think it has a cover. I wonder if it's shaped like this? http://www.rockauto.com/catalog/x,carcode,1128541,parttype,10630
Dana 44 is 8.5". The 9" is 9", lol. Some a bit smaller, some 9.38". The 8.75" was used throughout several years...like '67 and up, but it included the later Granada's and whatnot. I don't think the ring gear is the same number, but in Ford's classification, it could be if it received only engineering changes. This link explains it fairly well, I think. http://www.classicmustang.com/decoding_part_numbers.htm
Early econolines had the crappy falcon style rears/ leaf spring and 5 lug instead of 4 lug. HD econos got the 9". I had a 70 LTD 351W that had a Dana in it, coilspring not leaf.
Just for the hell of it, how do we know it wasn't a coil rear someone had in a leaf spring car then it got transplanted into the Olds?
I think we have a winner!!! This looks like the beast. Many thanks, now I can get wheel cylinders and brake shoes.
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