I have a 2004 GMC 3500 D/A and want to know what size my rear is. I know is is a 14bolt, but thats it. I was wondering who makes a diff cover? mag-hytec and.........? thanks


-Ltrain

Should be an 11.5" with the DMax.

If you have a dually I am sure it is pretty BIG...http://www.dieselplace.com/forum/smileys/HiHi.gif

I've learned not to answer this question when my wife asks it! http://www.dieselplace.com/forum/smileys/HiHi.gifhttp://www.dieselplace.com/forum/smileys/HiHi.gif

Should be one of these http://www.aam.com/technology/tech_prod_dl_rearaxle1150.html

On another topic someone contributed that I have an American General w/ 11 1/2" ring gear. Which corresponds with what I got from the GM parts counter. I think that it is the same on the 3500.

send me your vin and i will give you the exact info

all Dmax/ 8.1 trucks have an 11.5" axle. The 1 ton guys have a larger axle tube diameter. Same guts