Decoding a 1973 Vega GT Hatchback Rear Axel

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Decoding a 1973 Vega GT Hatchback Rear Axel

Postby robert123 » Mon Sep 14, 2015 1:28 am

Got a 1973 Chevy Vega GT hatchback -- seems to be original and came with 4cyl, 4spd and a/c. Never driven the car.
I did take off the rear axel cover and put in new gear oil. Also painted the cover flat black -- looked real good in there. Thinking about
doing the easy S-10 axel swap -- but seems like I need the 1975 and on bigger 7.50 ring gear. So 6.50 rear ends are no candidates
for the S-10 axel swap?


Here's the photo details [near as I can make out numbers and letters]:
1. G53 or O53 = on the right rear of the axel housing (next to the cover)
2. SO = on the cover itself (right-side by the bolt -- at 3pm)
3. HAC 194 = on the right axel tube; in front; about 3" from carrier; 1/4 inch tall letters.

Seems like 1971-1975 Vegas all had the weaker 6.50 ring gear. Then in 1976 they went to the bigger 7.50.

Rear axel Codes: http://www.v8monza.com/Rearaxle.htm
HA 1971-75 2.92 6.50"
HC 1971-74 3.36 6.50"
HMC 1977 2.92 6.50"

So, the rear end is a 6.5? And can anyone 'splain to me what the HAC 194 means?


Thanks a lot.
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1973 Chevy Vega GT Hatchback, stock, 4-speed
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Re: Decoding a 1973 Vega GT Hatchback Rear Axel

Postby 71GTKammback » Sun Oct 18, 2015 11:40 pm

HA means 2:92. The C means Chevrolet. I have the same rear endbi am rebuilding now
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Re: Decoding a 1973 Vega GT Hatchback Rear Axel

Postby EVL VEGA » Tue Oct 20, 2015 10:53 am

EVL VEGA
'73 Vega Hatchback (former Super Gas car)
406 SBC, AFR 210 Eliminator Heads, 9:1 comp, pump gas, 328RWHP/412RWTQ (old heads, no N2O 1/17/04), 6.86 @ 100.8 in 1/8th (No N20 9/4/16), Mike's Trans TH400 (reverse manual), 5000 stall, 12 bolt, 35 spline strange axles, 4.33 gears, spool, hipster transbrake, linelock, backhalved, Alston 3 link, 100 shot NX Hitman+ kit, LC1 Wideband sensor, 31x18.5 MT Sportsman Pros, "Plum Ugly"™ Purple paint.
"Pound to fit..paint to match"
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1973 Chevrolet Vega

Re: Decoding a 1973 Vega GT Hatchback Rear Axel

Postby robert123 » Wed Oct 21, 2015 1:55 am

71GTKammback wrote:HA means 2:92.
The C means Chevrolet. I have the same rear end I am rebuilding now


EVL VEGA
You probably already looked here right?
http://h-body.org/library/hbodyfaq/hbod ... codes.html


Thanks 71GTKammback
and EVL VEGA.
1973 Chevy Vega GT Hatchback, stock, 4-speed
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