Some of you may have seen my other thread about the 91 1LE I just acquired. The car is probably a 9.75 on a 1-10 scale. It is very, very nice and very unmolested. It does have an SLP cat-back on it and an SLP underdrive pulley, but that's it.

The question I have is about the rearend - everything I have read about the 3rd gen 1LE cars says that the G92 RPO code signifies the performance axle...and that 1LE was triggered when G92 was ordered and G80 and A/C were NOT ordered. THIS car has the G92 RPO and it also shows the G80 RPO....and 1LE also shows up on the RPO tag - HOWEVER - this car does not have the 9-bolt axle under it, it has the GM 10-bolt. Did they stop using the 9-bolt at some point prior to 1991? There is also NO chance its ever been swapped out, I know the complete history on the car. Hell, it even came with a box of original parts that have been swapped out over the years (dist cap, plug wires, etc.).

 

Welp - I think I have answered my own question. It appears that '89 was the last model year the 9-bolt Borg Warner axle was used in any F-body.

Drivetrain list of V8 Camaros

Yr Modl Tran. Engine CR Disp. HP Torque In- Manual Automatic
code/type duct. std. opt. std. opt.
----------------------------------------------------------------(G92)------(G92)

82 SC A3 LG4 V8 8.6:1 5.0 (305) 145@4000 240@2000 4V ---- ---- 2.73 ----
82 Brln A3 LG4 V8 8.6:1 5.0 (305) 145@4000 240@2000 4V ---- ---- 2.73 ----
82 Z28 M4,A3 LG4 V8 8.6:1 5.0 (305) 145@4000 240@2000 4V 2.73 ---- 2.73 ----
82 Z28 M4,A3 LU5 V8 9.5:1 5.0 (305) 165@4200 240@2400 CFI 3.23 ---- 2.93 3.23

83 SC M5,A4 LG4 V8 8.6:1 5.0 (305) 150@4000 240@2400 4V 3.23 3.73 3.08 ----
83 Brln M5,A4 LG4 V8 8.6:1 5.0 (305) 150@4000 240@2400 4V 3.23 3.73 3.08 ----
83 Z28 M5,A4 LG4 V8 8.6:1 5.0 (305) 150@4000 240@2400 4V 3.23 3.73 3.23 ----
83 Z28 A4 LU5 V8 9.5:1 5.0 (305) 175@4200 250@2800 CFI ---- ---- 2.93 3.23
83 Z28 M5 L69 V8 9.5:1 5.0 (305) 190@4800 240@3200 4VHO 3.73 ---- ---- ----

84 SC M5,A4 LG4 V8 8.6:1 5.0 (305) 150@4000 240@2400 4V 3.23 3.73 3.08 ----
84 Brln A4 LG4 V8 8.6:1 5.0 (305) 150@4000 240@2400 4V ---- ---- 3.08 ----
84 Z28 M5,A4 LG4 V8 8.6:1 5.0 (305) 150@4000 240@2400 4V 3.23 3.73 3.23 ----
84 Z28 M5,A4 L69 V8 9.5:1 5.0 (305) 190@4800 240@3200 4VHO 3.73 ---- 3.42 ----

85 SC A4 LG4 V8 9.5:1 5.0 (305) 155@4200 245@2000 4V ---- ---- 3.08 ----
85 Brln A4 LG4 V8 9.5:1 5.0 (305) 155@4200 245@2000 4V ---- ---- 3.08 ----
85 Z28 M5,A4 LG4 V8 9.5:1 5.0 (305) 155@4200 245@2000 4V 3.23 ---- 3.08 ----
85 Z28 A4 LB9 V8 9.5:1 5.0 (305) 215@4400 275@3200 TPI ---- ---- 3.23 ----
85 IROC M5,A4 LG4 V8 9.5:1 5.0 (305) 155@4200 245@2000 4V 3.23 ---- 3.23 ----
85 IROC M5 L69 V8 9.5:1 5.0 (305) 190@4800 240@3200 4VHO 3.73 ---- ---- ----
85 IROC A4 LB9 V8 9.5:1 5.0 (305) 215@4400 275@3200 TPI ---- ---- 3.23 3.42

86 SC M5,A4 LG4 V8 9.5:1 5.0 (305) 155@4200 245@2000 4V 2.73 ---- 2.73 ----
86 Brln A4 LG4 V8 9.5:1 5.0 (305) 155@4200 245@2000 4V ---- ---- 2.73 ----
86 Z28 M5,A4 LG4 V8 9.5:1 5.0 (305) 165@4400 250@2000 4V 3.23 3.73 2.73 ----
86 Z28 M5 *L69 V8 9.5:1 5.0 (305) 190@4800 240@3200 4VHO 3.23 3.73 ---- ----
86 Z28 A4 LB9 V8 9.5:1 5.0 (305) 190@4000 285@2800 TPI ---- ---- 2.73 3.23
86 IROC M5,A4 LG4 V8 9.5:1 5.0 (305) 165@4400 250@2000 4V 3.23 3.73 2.73 ----
86 IROC M5 @L69 V8 9.5:1 5.0 (305) 190@4800 240@3200 4VHO 3.23 3.73 ---- ----
86 IROC A4 LB9 V8 9.5:1 5.0 (305) 190@4000 285@2800 TPI ---- ---- 2.73 3.42
86 IROC A4+L98 V8 9.5:1 5.7 (350) 220@4200 320@3200 TPI ---- ---- 3.27*----
*only 74 produced +only 50 produced *Borg-Warner rear axle

87 SC M5,A4 LG4 V8 9.3:1 5.0 (305) 165@4400 245@2800 4V 3.23 ---- 2.73 ----
87 LT A4 LG4 V8 9.3:1 5.0 (305) 165@4400 245@2800 4V ---- ---- 2.73 ----
87 Z28 M5,A4 LG4 V8 9.3:1 5.0 (305) 170@4400 250@2800 4V 3.23 ---- 2.73 ----
87 Z28 A4 LB9 V8 9.3:1 5.0 (305) 190@4000 295@3200 TPI ---- ---- 2.73 ----
87 Z28 M5 LB9 V8 9.3:1 5.0 (305) 215@4400 295@3200 TPI 3.08 ---- ---- ----
87 IROC M5,A4 LG4 V8 9.3:1 5.0 (305) 170@4400 250@2800 4V 3.23 ---- 2.73 ----
87 IROC A4 LB9 V8 9.3:1 5.0 (305) 190@4000 295@3200 TPI ---- ---- 2.73 3.23
87 IROC M5 LB9 V8 9.3:1 5.0 (305) 215@4400 295@3200 TPI 3.08 3.45* ---- ----
87 IROC A4 L98 V8 9.3:1 5.7 (350) 225@4400 330@2800 TPI ---- ---- 3.27*----
*Borg-Warner rear axle

88 SC M5,A4 LO3 V8 9.3:1 5.0 (305) 170@4000 255@2400 TBI 3.08 ---- 2.73 ----
88 IROC M5,A4 LO3 V8 9.3:1 5.0 (305) 170@4000 255@2400 TBI 3.08 ---- 2.73 ----
88 IROC A4 LB9 V8 9.3:1 5.0 (305) 195@4000 295@2800 TPI ---- ---- 2.73 3.23
88 IROC M5 LB9 V8 9.3:1 5.0 (305) 220@4400 290@3200 TPI 3.08 3.45* ---- ----
88 IROC A4 L98 V8 9.3:1 5.7 (350) 230@4400 330@3200 TPI ---- ---- 2.77*3.27*
*Borg-Warner rear axle

89 RS M5,A4 LO3 V8 9.3:1 5.0 (305) 170@4400 255@2400 TBI 3.08 ---- 2.73 ----
89 IROC M5,A4 LO3 V8 9.3:1 5.0 (305) 170@4400 255@2400 TBI 3.08 ---- 2.73 ----
89 IROC A4 LB9 V8 9.3:1 5.0 (305) 195@4000 295@2800 TPI ---- ---- 2.73 ----
89 IROC M5 LB9 V8 9.3:1 5.0 (305) 220@4400 290@3200 TPI 3.08 ---- ---- ----
89 IROC M5 LB9 V8 9.3:1 5.0 (305) 230@4600 300@3200 TPI ---- 3.45* ---- ----
89 IROC A4 L98 V8 9.3:1 5.7 (350) 230@4400 330@3200 TPI ---- ---- 2.77*----
89 IROC A4 L98 V8 9.3:1 5.7 (350) 240@4400 345@3200 TPI ---- ---- ---- 3.27*
*Borg-Warner rear axle

90 RS M5,A4 LO3 V8 9.3:1 5.0 (305) 170@4000 255@2400 TBI 3.08 ---- 2.73 ----
90 IROC M5,A4 LB9 V8 9.3:1 5.0 (305) 210@4400 285@3200 TPI 3.08 ---- 2.73 ----
90 IROC M5 LB9 V8 9.3:1 5.0 (305) 230@4400 300@3200 TPI ---- 3.42 ---- ----
90 IROC A4 L98 V8 9.3:1 5.7 (350) 245@4400 345@3200 TPI ---- ---- ---- 3.23

91 RS M5,A4 LO3 V8 9.3:1 5.0 (305) 170@4000 255@2400 TBI 3.08 ---- 2.73 ----
91 Z28 M5,A4 LB9 V8 9.3:1 5.0 (305) 205@4200 285@3200 TPI 3.08 ---- 2.73 ----
91 Z28 M5 LB9 V8 9.3:1 5.0 (305) 230@4200 300@3200 TPI ---- 3.42 ---- ----
91 Z28 A4 L98 V8 9.3:1 5.7 (350) 245@4400 345@3200 TPI ---- ---- ---- 3.23

92 RS M5,A4 LO3 V8 9.3:1 5.0 (305) 170@4000 255@2400 TBI 3.08 ---- 2.73 ----
92 Z28 M5,A4 LB9 V8 9.3:1 5.0 (305) 205@4200 285@3200 TPI 3.08 ---- 2.73 ----
92 Z28 M5 LB9 V8 9.3:1 5.0 (305) 230@4200 300@3200 TPI ---- 3.42 ---- ----
92 Z28 A4 L98 V8 9.3:1 5.7 (350) 245@4400 345@3200 TPI ---- ---- ---- 3.23

Engine codes (8th digit of VIN):
- H LG4 - 7 LU5 - E L03 - G L69 - F L89 - 8 L98

 

Yup certain things change year to year and were different between Firebird 1LEs and Camaro 1LEs. For example there are some with A/C and even fog lamps and radio's.

 

My car is completely stripped - plain jane. It does have an AM/FM radio (no cassette player), but that's it.

 

It should be noted that some cars actually got the B&W axle in 1990... I suspect it was over-run from 1989 and they just used them in production. Technically they were supposed to be the 10 bolt Saginaw. There are no 1990 cars with the B&W axle RPO however...

 

Sounds reasonable - what is the RPO for the B/W Axle? I thought it was G92.

 

There was no specific RPO that denoted the B&W axle, it was based on the axle ratio. 2.73 (GU2), 3.23 (GU5), 3.42 (GU6) were all Saginaw gears, 2.77 (GH3), 3.27 (GW6) & 3.45 (GM3) were all B&W gears... In essence they did get a unique RPO when the B&W was called for but it would be incidental as there was no RPO stating "B&W" Also no 1990's came with these RPOs (GH3), (GW6) or (GM3) on the SPID sheet but there may have been some with them installed...

 

Ah - makes sense. Here's a pic of my RPO sheet:

 

Your car would be a later 1990, so chances are it would be a Saginaw gear... Crawl under it and count the bolts on the back of the pig.

John

 

The car is a '91 and it definitely has a 10-bolt in it.

 

The fact that you have GU6 tells me that it's a 10 bolt. Also, in response to your first post, G80 was not part of what triggered the 1LE option. G92 and AC delete were the triggers. G80 is poistraction and G92 is performance axle. The G92 is a package, not an individual option. By ordering G92, you got the stronger ratio, posi, engine oil cooler, supposed to get rear discs, but they weren't always available, and in the later years you would get dual catalytic converters.