Not the RPO #'s I mean the one that is stamped on the right side of the rear axl ..

I'm just trying to figure out what my gears are out in th rear and heres the code on it

H C209 1

Thanks

Kat

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90 RS 305 TBI A4
Dumb ***/**** poor/orginating memeber of the infamous NE Crew
Time to see, believe this in me,This pain that i feel deep inside

 

Kat,

These characters are very difficult to see sometimes. We're missing a couple of digits. Here's an example for 1990:

6HKG2091

6HK = rear axle ratio (3.08 in this example)
G = Chevrolet Gear and Axle Plant
209 = 209th day of the year
1 = 1st (Day) shift.

You should have a one character before and one after the "H" in your code. The first character can be a 2, 6 or 8. The third (after the "H") will be a letter (too many to mention here).



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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
12.57 @ 111 mph.
12.04 @ 114 mph (50-hp nitrous).
http://www.ozemail.com/au/jca69/mods/williesz/willie.html

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.

 

Willie thanks I will look tomrrow to see if I can "see" the other letters on the axl =0

Thanks again

Kat

------------------
90 RS 305 TBI A4
Dumb ***/**** poor/orginating memeber of the infamous NE Crew
Time to see, believe this in me,This pain that i feel deep inside

 

Ok I got em

I belive it is 3JH C209 1

I hope those work for ya

Thanks again

Kat

------------------
90 RS 305 TBI A4
Dumb ***/**** poor/orginating memeber of the infamous NE Crew
Time to see, believe this in me,This pain that i feel deep inside

 

Hey Willie how do you find out what the first 3 characters mean (axle ratio) I believe mine is

2HPC3111
2HP = what axle ratio?
C = what (or maybe it was a G)?
311 = 311th day of the year?
1 = 1st shift?

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84 Firebird with Trans am ground effects- 350 4bbl GM crate motor (LM1), T-Tops, automatic, K&N filter, 180* thermostat, ram-air hood scoop, flowmaster muffler, Accel cap & rotor, MSD Super Conductor Wires. Coming soon: new interior (grey), rear end work, subframe connectors, polyurethane bushings

 

John, I have a reference manual with almost all codes listed: Engine, transmission, rear axle, paint, trim, etc.

2HP = 2.73:1 open
It is a "G"
Correct on the 311 & 1

Willie