diff ratios

hausdok · Post by **hausdok** » Sat Dec 12, 2009 5:07 pm

So I gotta replace the front diff on my 98. Need to find the ratio so I get the right one, found one of each ratio but need to be sure before i fire off the order.

ihatemybike · Post by **ihatemybike** » Sat Dec 12, 2009 5:44 pm

Look at the RPO codes located on the passenger side door. You are looking for something beginning with G.

GU5 = 3.23
GU6 = 3.42

Let us know if you have any other G code.

GnarliSafari · Post by **GnarliSafari** » Sun Dec 13, 2009 1:36 am

gt4 3.73

Cobra · Post by **Cobra** » Sun Dec 13, 2009 7:50 am

he probably didn't metion that since i've NEVER seen 98+ van come with them

GnarliSafari · Post by **GnarliSafari** » Sun Dec 13, 2009 9:38 am

um i have a 99 with the 3.73? i did rebuild the rear about five years ago, but the 3.73/posi (GT4/G80) rear was what came stock in mine, and what i replaced it with.

SoCalli V8 · Post by **SoCalli V8** » Sun Dec 13, 2009 1:41 pm

I have some good used 3.42 gears going cheap if anyone needs them, pm me.

hausdok · Post by **hausdok** » Sun Dec 13, 2009 2:36 pm

didn't see any of the codes aou of all the list starting with a G, hmm...I even gotglasses and a flashlight to look real close.

Cobra · Post by **Cobra** » Sun Dec 13, 2009 4:16 pm

GnarliSafari wrote:um i have a 99 with the 3.73? i did rebuild the rear about five years ago, but the 3.73/posi (GT4/G80) rear was what came stock in mine, and what i replaced it with.

REALLY thats a new one for me

no G...? thats another new one for me

ihatemybike · Post by **ihatemybike** » Sun Dec 13, 2009 5:12 pm

Take a clear pic and post?

hausdok · Post by **hausdok** » Mon Dec 14, 2009 10:25 pm

Hafta wait til tomorrow for the pic. Anniversary overrode the other problem for tonite. Will put it up around 5 tomorrow eve after work.

hausdok · Post by **hausdok** » Tue Dec 15, 2009 1:48 pm

Found it found it found it... it's the GT4. Damn i gotta look for a different one, the St Louis one is the wrong one.

rlsllc · Post by **rlsllc** » Tue Dec 15, 2009 3:54 pm

hausdok wrote:Found it found it found it... it's the GT4. Damn i gotta look for a different one, the St Louis one is the wrong one.

Damn??? Damn lucky, I'd say. I've had several 3:42 geared vans and 2 with 3:73 (GT4), and LOVED the 3:73s. They are more rare, so I see the problem. It's a good problem to have if you ask me.

sxfx · Post by **sxfx** » Tue Dec 15, 2009 5:03 pm

HEY, this is perfect I have a 93 with 89k miles 3:73 sitting in my Garage right now. I picked it up for my Astro just to find out that my rear is a 3:42.

If you want it's yours for $200, I live in Illinois too feel free to contact me.

email:skipl1983@yahoo.com
aim:pijaczek18
yahoo:skipl1983

LiftedAWDAstro · Post by **LiftedAWDAstro** » Wed Dec 16, 2009 4:20 am

The 93 front diff won't work on a 98. Axle shafts are different and not interchangeable.

sxfx · Post by **sxfx** » Wed Dec 16, 2009 7:40 am

Oh yeah good point, completely forgot about that part hehe.

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