Here's The Breakdown:

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DH: I need to know what rearend and transmission came stock on '72 Chevelle 2-door, 350ci.

TM: The rear end was a 2.73 and the transmission was either a TH350 or a TH400.

SM: My '72 came stock with a 350 4bbl, TH400, and 3.23 12 bolt rear. Also when I had to replace the u-joints, I had to get a special OEM one for the rear joint. Apparently, the shaft is a big block and the rear-end yoke is a small block. That's the way it came stock.

MA: It also depends on what the owner wanted. I am sure there were several options. Check the VIN?

CM: According to the brochure, (if you read between the lines) the L65 2-barrel engine came with 10-bolt rearends regardless of transmission; the L48 4-barrel came with 12-bolt rearends (at least with the manual transmissions). I have also heard that very late in the '72 run they began using the revised '73 type 10-bolts in some applications.
As for transmissions, the L65 used the Saginaw 3 and 4-speed, and the TH350.
As for the 4-speed? In '71, as in '69-'70, they used the Muncie 2.52:1 unit; but in '72 they probably switched to the Saginaw. That's what they did in Novas & Camaros for sure.
The automatic with the L48 was factory TH350. Only the Corvettes & Z28 350's used the TH400.

Axle ratios (std.):
L65 / 3-speed. - 3.08;
L65 / 4-speed. - 3.36;
L65 / auto - 2.73;
L48 / 3-speed. and 4 -speed. - 3.31;
L48 / auto - 2.73

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Archivist: Tom Wilson


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