My new 2500 SB HO Cummins with Automatic (48RE) was delivered to me yesterday. I didn't specify the rear end<br>ratio at the time of order. The sticker shows under<br>transmission &quot;axle - rear, 11.50&quot;. Is the 4.10 the <br>standard shipped ratio for the automatic and what <br>does the 11.50 mean? ???

 

I'm going to guess 11.5 inch rear end .........<br><br>**** makes the old 8 3/4&quot; I had in my coronet sound tiny <br><br>

 

prolly means you have a dana 80 rear<br>If you jack up the rear end and put the truck in neutral-<br>Draw a horozontal line on your driveshaft and one on your tire. Rotate the tire one revolution while you count revolutions of the drive shaft- this is any easy way to tell your gear ratio. Plus if both tires rotate in the same direction, then you have an ls.

 

There should be a &quot;build&quot; tag on one of the rear cover bolts with the ratio stamped on it.

 

Open the glove box and take a peek at the sticker (not the window sticker). Save yourself all the trouble listed above. No need to get under truck. Helped a local guy yesterday figure it out, hes searched and searched for the tag on the differential..........popped open the glove box and low and behold hes got 3.73 ratio

I got a kick out of it. The 11.5 stand for the 11.5&quot; rearend.

 

The build tag is on both front and rear ends. Also it is on the window sticker of opptions/standard that came with the truck. My first truck a gasser the ratio came under my name off to the side. You would of got the Sandard unless you ordered the option 4:11 $75.00 more. OverFueled

 

[quote author=OverFueled link=board=4;threadid=12929;start=0#122215 date=1049056334]
The build tag is on both front and rear ends. Also it is on the window sticker of opptions/standard that came with the truck. [/quote]

Have you looked at an 03? Remember they have American Axle instead of &quot;our&quot; Dana axles.

 

KatDiesel Thanks it went right over my head. This is an 03 not 02. OF

 

[quote author=KatDiesel link=board=4;threadid=12929;start=0#122216 date=1049056530]<br>[quote author=OverFueled link=board=4;threadid=12929;start=0#122215 date=1049056334]<br>The build tag is on both front and rear ends. Also it is on the window sticker of opptions/standard that came with the truck. [/quote]<br><br>Have you looked at an 03? Remember they have American Axle instead of &quot;our&quot; Dana axles. <br>[/quote]<br><br><br>OOps- missed it also....

 

On my 98 there is a tag on the underside of the hood with, among some other things, the ratio listed. Don't know if the newer ones are the same way, just some food for thought.

 

Hey, thanks for the replys. There is a sticker in<br>the glovebox that has the Axle Ratio listed along<br>with other info as Limited Slip and Paint Color.<br> ;D ;D