Quote:
Originally Posted by Tru2Chevy
He should already have 3.42 gears in an auto 3.8, but if he wants to get some shorter gears (like 4.10s) he's best off either finding someone who's upgrading to an aftermarket rear and buy their rear with gears / posi in it already, or just buying the gears and posi and having a shop install them for him.
- Justin
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3.42's were an option for autos, Y87 package. Manuals got the 3.23's and autos had 3.08's or optional y87 3.42's. even if u had the y87 package in a maunal u still got 3.23's. Just check the door, either way ur right just look for a rear with the higher gears already in it and slap it on there
RPO codes
gu4 - 3.08
gu5 - 3.23
gu6 - 3.42
y87 - y87 package...
3.8L V6 INFO
L36 3800 Series II (3.8L/231ci)
OHV 90* V6 (Bore 3.8in/Stroke 3.4in)
Compression Ratio: 9.4:1
Firing Order: 1-6-5-4-3-2
Injector Size: 22lbs
Intake Manifold: 95-98 Angled, 99+ Straight
Throttle Body: 65mm Hitachi
Thermostat: 95-98 195*, 99+ 180*
Flywheel HP: 200 @ 5200 rpm
Flywheel TQ: 225 @ 4000 rpm
Gears: 3.08 Auto, 3.23 Standard, 3.42 Y87
3800 PERFORMANCE PACKAGE (Y87)
Limited Slip Differential (G80 Code: 96-98 Auburn, 99-01 Zexel-Torsen)
