96 C3500 RCLB aka Stumpy

[PlayingWithTBI]

Jack the rear end up and count the # of turns of the drive shaft to get one turn on the wheels, you'll get a ballpark idea.

 

[Stumpy]

I ran across a web site that says it's either going to be 4.10, or 4.56. Either of which is fine with me.

 

[Frank Compagnon]

Got to thinking about this, and look at the RPO sticker again. Somebody changed the glove box door. It has a different Vin number on it, than the truck, and a production date of 4/98, my truck is a '96.

So, now I have no idea what gear this thing has in it, but glad it's probably not 3.42.

If you take the Vin number from the window or your reggy to GM and ask for the options list of the truck, they will print you off all the info you are looking for. I have done it many times.

 

[skylark]

I ran across a web site that says it's either going to be 4.10, or 4.56. Either of which is fine with me.

Exactly my experience, 4.10 is the most common. I could be wrong but I believe that the 4.56 was only in the 3500HD chassis.

 

[Dahead76]

My 95 has 3.73 gears. Wish it had 3.42s since it’s a diesel and 5 speed.

 

[skylark]

My 95 has 3.73 gears. Wish it had 3.42s since it’s a diesel and 5 speed.

Is it a dually?

 

[Dahead76]

Is it a dually?

Yes, it’s a single cab dually.

 

[Stumpy]

Yes, it’s a single cab dually.

Is that your truck in the avatar pic? Can you post a full size shot, and some info on your tires, and wheels? Thanks

 

[skylark]

Yes, it’s a single cab dually.

You definitely have a unicorn there! Would you mind posting up a picture of the RPO codes from the glove box? I would love to find a 3.73 dually rear.

 

[Dahead76]

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Is that your truck in the avatar pic? Can you post a full size shot, and some info on your tires, and wheels? Thanks

They are Alcoa’s. 22.5s cut down to 22s. Tires are 265-40-22. This is one mutt of a truck. Parts from 1500s to 3500HD trucks. It has a 3-4 drop currently.

You definitely have a unicorn there! Would you mind posting up a picture of the RPO codes from the glove box? I would love to find a 3.73 dually rear.

Sorry, I need to elaborate. The truck was originally a 2500 w/t. I converted it to a dually and had the gears swapped from the 3/4 ton rear to the dually rear. The dually rear originally had 4.10 gears. I didn’t like running the 6.5 diesel over 2500 rpms to run 70 mph.