I am new to camaro's and F body in general... I am trying to fix my girls 99 v6 camaro rearend. This thing is howling... BAD.. I do not mess with rearends as far as rebuilding them. I need to know what the gear ratio is, so that I can replace the rearend. Any info would be great..

Thanks

 

Look for the sticker on the door with the VIN number. Under that is usually found a series of 3 digit codes...one of these with start with GU, that is your rear axle code.


GU3 - 2.73 - Most auto cars
GU5 = 3.23 - was on my 5 speed V6, or certain Auto's with performance pkg.

When mine died I got a takeoff 3.42 axle from the wreckers out of a 99TransAm. It was also alot better because it had a Posi in it, vs the V6's didn't get that and one wheel would always spin.


Here is a copy of other stuff that was in my VIN that might be similar to yours:


AG1 - Adjuster, 6-Way Power, Driver Seat
AK5 - Restraint System Front Seat, Inflatable, Driver and Passenger
AN4 - Restraint Provisions, Child
AR9 - SEAT ASM,FRT BKT RECL(EUROPEAN STYLE)
AU0 - Lock Control, Remote Entry
AU3 - Lock, Side Door, Electric
A31 - Window, Power Operated, Side
A90 - Lock, Rear Compartment Lid, Remote Control, Electric
B35 - Floor Mats, Rear, Carpeted Insert
B84 - Exterior Molding, Body Side
C49 - Defogger, Rear Window Electric
C60 - HVAC System, Air Conditioner, Manual Control
DG7 - Mirror, Outside LH & RH, Remote Control, Electric, Painted
FE9 - Certification Emission, Federal
F41 - Suspension System, Firm Ride Handling, Front and Rear
GU5 - Axle, Rear 3.23 Ratio
IPB - Trim, Interior Design
J41 - Brake System, Power, Front Disc, Rear Drum, Cast Iron
K05 - Heater, Engine Block
K29 - Module, Powertrain Control
K34 - Cruise Control, Automatic Electronic
K68 - Generator, 1 05 Amp
L36 - Engine, 3.8L (V6) MFI
MM5 - Transmission, Manual, 5-Speed, (Merchandising Option)
M49 - Transmission, Manual, 5-Speed, Borg Warner, 77mm, 3.75 1st, 0.76 5th, O/D
NF2 - Emission System- Federal Requirement, Tier 1
NP5 - Steering Wheel, Leather Wrapped
N96 - Wheel, 16x8, Cast Aluminum
OCB - ?
R7K - ?
STE - Plant Code-St. Therese, PQ, GM of Canada
T61 - Lighting- Daytime Running
T96 - Lamp, Fog
UA6 - Theft Deterrent System
UB3 - Instrument Cluster, Oil, Coolant, Temperature, Volts, Trip Odometer, Tachometer
UU8 - Radio, AM/FM Stereo, Seek/Scan, Auto Reverse Music Search Cassette, HPS, Clock, ETR
U19 - Speedometer Instrument, Kilometers and Miles, Kilometer Odometer
U65 - Speaker system 5, Dual Front Door Mtd, Dual Ext. Range Panel, Single Rear Compartment
U73 - US/Canada Vehicle Statement
VK3 - License Plate, Front Mount Package
V73 - Vehicle statement, US/CANADA
Z31 - ?
Z49 - Canadian Modifications
1SC - Package option 03
1SZ - Discount option package
10Q - Molding Color - Arctic White
10U - Primary Color - Exterior, Arctic White
12B - Trim Combination - Cloth, Graphite
12I -
6GM -
7GM -
8TB
9TB

 

Great thanks..... When you did the conversion did you have to do any modifications to anything else ie speedo and trans shift issues?

 

Ok I just looked at the car.... I have a GU4 so... Any takers...?

 

The only issues was fabbing up brake lines from 4 channel to 3 channel it was fairly simple. That and ABS light was always lit and ABS inop. Never adjusted speedo may have been slightly out, but since daughter was driving car, it was ok, probably read 5-10 miles /hr faster than it really was...she was happy she thought she was going faster than she was and I was happy too.

GU4 it appears to be a 3.08 final drive ratio...haven't seen it before in an F-bod

 

3.08 is common in V6s.