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Old 12-28-2010, 04:49 PM
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Vega rear

Gentlemen: I need help in finding what gears are in my '74 Chevy Vega Panel Wagon , The tag is missing, 7.5 rear, 26 spline,, The number on the chunk says 344134? Thank You. Chris
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Old 12-28-2010, 07:51 PM
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That's just the casting # of the cast centersection, it won't tell you anything.

If it has a posi rear, jack it up both tires off the ground, rotate the tire 1 revolution and count the number of driveshaft revolutions to determine the ratio.

If it is an open rear(no positraction), jack just one tire off the ground, rotate the tire 1 revolution and count the driveshaft revolutions, and multiply that driveshaft number by 2 to get the gear ratio.

Or you could just pull the cover and count teeth or read the # off the ring gear stamping. This is the best method.

There is a code stamped into the passenger side axle tube, usually the forward side, that can be deciphered to find out the original gearing, but it is often rusted away or illegible. Gm didn't use tags like some other manufacturers did.
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Old 12-28-2010, 08:55 PM
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GM has used tags in the past- but not on the Vega. From HERE:


GM DIFF ID TAG LOCATION (3.36 shown)


GM DIFF ID TAGS

You might look for an RPO sticker- although the Vega may have been before they were in wide use. The stickers are sometimes located in the glovebox, under the hatch or trunk lid or console.
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Old 12-29-2010, 04:24 AM
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Quote:
Originally Posted by cujo77
Gentlemen: I need help in finding what gears are in my '74 Chevy Vega Panel Wagon , The tag is missing, 7.5 rear, 26 spline,, The number on the chunk says 344134? Thank You. Chris
I know this doesn't help answer your question, but if the rear is original to your 74 it is a 6.5 rear, & not a 7.5.
Here's the link to a good Vega & Monza message board:
http://forums.h-body.org/index.php

Jon
http://1972vega.wordpress.com/
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Old 12-29-2010, 04:51 AM
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Quote:
Originally Posted by jon72vega
...if the rear is original to your 74 it is a 6.5 rear, & not a 7.5.
I know the H-body got a version of the 7.5" diff somewhere along the line. Do you know when that was?
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Old 12-29-2010, 05:17 PM
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Don't bet the farm on the info I listed below, because I've heard guys that swear their car had as factory original this rear or that rear. .....BUT to the best of my knowledge:

The Vega (with the exception of the Cosworth Vega) supposedly never got the 7.5.
The Monza & siblings all were supposed to have the 7.5 from 1975 on up.

Jon
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Old 12-29-2010, 06:55 PM
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vega rear

My '74 has 10-bolt, with panhard bar, torsion bars, and torque arm like an F-body.
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