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Discussion Starter · #1 · (Edited)
"8.5" 10 Bolt 30 Spline Ring Gear Axle

GM8 - 2.56
GU2 - 2.73
GU3 - 2.93
GU4 - 3.08
GU5 - 3.23
GU6 - 3.42

G80= Positraction








1991 - L03 Caprice(5.0) 2.56Gears

1991 - L03 Caprice Wagon(5.0) 2.73Gears

1991 - L05 Caprice 9c1(5.7) 3.42Gears

1992 - L03 Caprice(5.0) 2.56Gears or (0ptional 3.08) or (LTZ 3.23)

1992 - L05 Caprice Wagon(5.7) 3.23Gears

1992 - L05 Caprice 9c1(5.7) 3.42Gears

1993 - L03 Caprice(5.0) 2.56Gears or (0ptional 3.08) or (LTZ 3.23)

1993 - L05 Caprice(5.7) 3.23Gears

1993 - L05 Caprice 9c1(5.7) 3.42Gears

1994 - L99 Caprice(4.3) 2.73Gears

1994 - L99 Caprice 9c1(4.3) 3.23Gears

1994 - L99 Caprice Wagon(4.3) 2.93Gears

1994 - Lt1 Caprice Wagon(5.7) 2.56Gears

1994 - Lt1 Caprice Wagon Tow Package(5.7) 2.93Gears

1994 - Lt1 Caprice 9c1(5.7) 3.08Gears

1994 - Lt1 Caprice B4U Tow Package(5.7) 2.93Gears

1994 - Lt1 Impala Ss(5.7) 3.08Gears

1995 - L99 Caprice(4.3) 2.93Gears (revised from the early 2.73)

1995 - L99 Caprice 9c1(4.3) 3.23Gears

1995 - Lt1 Caprice Wagon(5.7) 2.56Gears

1995 - Lt1 Caprice Wagon Tow Package(5.7) 2.93Gears

1995 - Lt1 Caprice (c1(5.7) 3.08Gears

1995 - Lt1 Caprice B4U Tow Package(5.7) 2.93Gears

1995 - Lt1 Impala Ss(5.7) 3.08Gears

1996 - L99 Caprice(4.3) 2.93Gears (Revised from the Early 2.73)

1996 - L99 Caprice 9c1(4.3) 3.23Gears

1996 - Lt1 Caprice Wagon(5.7) 2.56Gears

1996 - Lt1 Caprice Wagon Tow Package(5.7) 2.93Gears

1996 - Lt1 Caprice 9c1(5.7) 3.08Gears

1996 - Lt1 Caprice B4U Tow Package(5.7) 2.93Gears

1996 - Lt1 Impala Ss(5.7) 3.08Gears

So if u want some good cheap gears find any one of these vehicles like 1991-1993 9c1(5.7) for the 3.42s or a 1994-1996 9c1(4.3) for the 3.23 s
 

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Don't for get the 92 LTZ with the L03 had 3.23 gears.
 

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My 91 had the posi & 3.08's. Would it be considered an LTZ even though it did not have leather & digital dash, but otherwise loaded to the hilt?
 

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I believe the wagons came with 3.23s in the tow package as well.
 

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My 91 had the posi & 3.08's. Would it be considered an LTZ even though it did not have leather & digital dash, but otherwise loaded to the hilt?
No, the LTZ's also got the FE3 springs, 235 tires and a few other things, its been a while since my LTZ so I don't remember exactly the options it had. But it had every option but leather and a sunroof, not to get off the topic though.
 

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Hey fullname, add the axle housing size, carrier size an the three-digit RPO code to your list and you'll get a sticky! :)
 

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Discussion Starter · #8 ·
hummmmmmmmmmmmm.. lets see

1)
"1994 - L99 Caprice Wagon(4.3) 2.93Gears" ... Good luck finding this ONE ... IT is extremely rare

2)
Per the ImpalaSS FAQ and some factory documentation, the standard axle ratio for all L99 4.3L Caprices is 2.73, not 2.93. More importantly, all 2.73 B-bodies used a smaller, weaker axle housing.

3)
If you want some good cheap gears, and are lucky enough to find these ...
1993 L05 Cadillac Fleetwood V4P Tow Package 3.73
1994-1996 LT1 Cadillac Fleetwood V4P Tow Package 3.42

the 2.73Gears only came on the 1994 Caprice Civilian L99(4.3) and was later changed to 2.93Gears for the 1995-1996 caprice Civilian L99(4.3) Models

NEW FOR 1995:


* Impala SS model was available interim '94
* Caprice Classic LS model discontinued
* Bosch ABS V (TM) anti-lock brake system
* Revised exterior appearance w/new foldaway, outside rearview
mirrors and a new quarter panel, and quarter window treatment
(similar to Impala SS)
* Enhanced family of radios
* 2.93 axle ratio standard with 4.3L V8 engine (replacing 2.73
axle ratio)
* Cinching safety belts replace "free-falling" design (rear
seat)


http://www.caminokid.com/1995_chevrolet_caprice.htm
 

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Hey fullname, add the axle housing size, carrier size and the three-digit RPO code to your list and you'll get a sticky! :)
1)
2.56 ... 2.93 ... 3.08 ... 3.23 ... 3.42 for 94-96 Cadillac Fleetwoods with V4P Tow Pack ... and 3.73 for 93 Cadillac Fleetwoods with V4P Tow Pack
all used the 8.5" axle housing.
Only 2.73 used the 7.625" axle.

2)
2.93 ... 3.08 ... 3.23 ... 3.42 ... 3.73
all used the Series 3 carrier.
Only 2.56 used the Series 2 carrier.
 

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Ran the vin on my 91. Got these options:
FE2 suspension
GU4-3.08 Ratio
G80-Posi
L03-305 Engine. (not anymore).
 

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My 94 Roadmaster has the three following 'G' code options:

GW9 - 2.93 gears
G67 - Automatic Leveling System
G80 - 2 stripes instead of 1

Anything the G67 is good for performance wise? It isn't a 90's Lincoln style nightmare is it?
 

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Hey fullname, add the axle housing size, carrier size an the three-digit RPO code to your list and you'll get a sticky! :)
And, while you're at it....axle ID codes, <<<(click for pix) which are not the same as RPO's...there is a correlation, but finding an axle out of a car, in a boneyard, in a shop, whatever, the axle code (on the housing) will at least indicate what the original use/source was.

So if u want some good cheap gears find any one of these vehicles like 1991-1993 9c1(5.7) for the 3.42s or a 1994-1996 9c1(4.3) for the 3.23 s
Gears do wear....and new replacements are not really expensive...and chances of finding a 15 year-old (or older) axle that is good as is (doesn't need bearings, axles are good, gears are good, no leaks, etc) is not something I would bet on.
 

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"8.5" 10 Bolt 30 Spline Ring Gear Axle

GM8 - 2.56
GU2 - 2.73
GU3 - 2.93
GU4 - 3.08
GU5 - 3.23
GU6 - 3.42

G80= Positraction








1991 - L03 Caprice(5.0) 2.56Gears

1991 - L03 Caprice Wagon(5.0) 2.73Gears

1991 - L05 Caprice 9c1(5.7) 3.42Gears

1992 - L03 Caprice(5.0) 2.56Gears or (0ptional 3.08) or (LTZ 3.23)

1992 - L05 Caprice Wagon(5.7) 3.23Gears

1992 - L05 Caprice 9c1(5.7) 3.42Gears

1993 - L03 Caprice(5.0) 2.56Gears or (0ptional 3.08) or (LTZ 3.23)

1993 - L05 Caprice(5.7) 3.23Gears

1993 - L05 Caprice 9c1(5.7) 3.42Gears

1994 - L99 Caprice(4.3) 2.73Gears

1994 - L99 Caprice 9c1(4.3) 3.23Gears

1994 - L99 Caprice Wagon(4.3) 2.93Gears

1994 - Lt1 Caprice Wagon(5.7) 2.56Gears

1994 - Lt1 Caprice Wagon Tow Package(5.7) 2.93Gears

1994 - Lt1 Caprice 9c1(5.7) 3.08Gears

1994 - Lt1 Caprice B4U Tow Package(5.7) 2.93Gears

1994 - Lt1 Impala Ss(5.7) 3.08Gears

1995 - L99 Caprice(4.3) 2.93Gears (revised from the early 2.73)

1995 - L99 Caprice 9c1(4.3) 3.23Gears

1995 - Lt1 Caprice Wagon(5.7) 2.56Gears

1995 - Lt1 Caprice Wagon Tow Package(5.7) 2.93Gears

1995 - Lt1 Caprice (c1(5.7) 3.08Gears

1995 - Lt1 Caprice B4U Tow Package(5.7) 2.93Gears

1995 - Lt1 Impala Ss(5.7) 3.08Gears

1996 - L99 Caprice(4.3) 2.93Gears (Revised from the Early 2.73)

1996 - L99 Caprice 9c1(4.3) 3.23Gears

1996 - Lt1 Caprice Wagon(5.7) 2.56Gears

1996 - Lt1 Caprice Wagon Tow Package(5.7) 2.93Gears

1996 - Lt1 Caprice 9c1(5.7) 3.08Gears

1996 - Lt1 Caprice B4U Tow Package(5.7) 2.93Gears

1996 - Lt1 Impala Ss(5.7) 3.08Gears

So if u want some good cheap gears find any one of these vehicles like 1991-1993 9c1(5.7) for the 3.42s or a 1994-1996 9c1(4.3) for the 3.23 s
I realize this is an old topic but can someone help me verify what I need to redo the rear in my 95 L99? According to the trunk tag I have:

GW9 : AXLE REAR, 2.93 RATIO (DUP WITH GU3)
JA1 : BRAKE, LIGHT WEIGHT DISC DRUM (9")

I know I need to replace one axle shaft for sure and we think possibly the pinion bearing, but I am having a hard time determining what axle I need, I have looked them up but the descriptions list them as for the 2.93 but with the JA2 heavy duty brakes, is the axle the same? Also, did all of these come with an 8.5 or 8.62 ring gear, cause I have been told with it being light duty brakes it could be a 7.5"? Any help would be greatly appreciated.

Phil
 

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BP, it is quite likely that your car has the 7.625" axle/carrier. The axle shafts are 28-spline, while the 8.5/8.625 is 30-spline.

If you can find the axle code on the housing, that will help/confirm what you have. Located on right axle tube (Pass. side), on forward side of tube.

FWIW, to my knowledge, GW9 was the only code used relating to 2.93 ratio for the 91-96 vehicles, regardless of ring-gear diameter. If GU3 is in the GM RPO list as 2.93 ratio, it was not applicable to these vehicles.
 

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BP, it is quite likely that your car has the 7.625" axle/carrier. The axle shafts are 28-spline, while the 8.5/8.625 is 30-spline.

If you can find the axle code on the housing, that will help/confirm what you have. Located on right axle tube (Pass. side), on forward side of tube.

FWIW, to my knowledge, GW9 was the only code used relating to 2.93 ratio for the 91-96 vehicles, regardless of ring-gear diameter. If GU3 is in the GM RPO list as 2.93 ratio, it was not applicable to these vehicles.
let me go scrub and see what I can find, be back in a few
 

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I can't answer the question of whether it's worth it--you don't know what's available in the yards, and it will depend on your budget, if there's a limit to what you're willing to spend.

If you change the rear axle to 8.5, you will also have to change the driveshaft, which is shorter for the 8.5. As already mentioned, the axle shafts in your car are 28-spline.

Be aware, too, that if you were to replace the axle as a complete unit, whether 7.625 or 8.5, you want to get the wider housing, which is what is on your car now.

If you really wanted to improve things in the process, look for a complete unit from a 94-96 B4U Caprice--8.5" - GW9/2.93 with G80 (limited-slip) and the larger rear drum brakes. Just remember to get the driveshaft, too, if it's available and not damaged.

Axle code (on the right axle tube) will be 2LQ / 2.93 (GW9)/ 11" / 1598mm Limited Slip

You will need to get some new park brake cables, too!
 
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