Hey I just ordered a 2004 LLY GMC 2500 HD D-Max 4X4. I was wondering if I can put 285 tires on it w/o putting a lift kit on there? I am sure I will have to crank the torsion bars. Also how to you break these bad boys in? Thanks

285s look great! They will work fine. I have had no problems at all. Crank up the T bars and trim the front fender. BTW I would trade in the 6.5" wheels for some 8" wheels. the stock ones are a little narrow for 285s.


As far as break in goes. Some say keep it under 60 MPH for the first 500 miles so the rear end doesn't overheat, then tow for 500 miles and you are good to go. Others say it helps the rings seat if you give it hell from day one.


I kept the speeds under 60 for 500 miles but Gave it hell on every freeway onramp to seat the rings. Edited by: LLY DMAX

Welcome Brady, w/ the stock rims u just have to tie the left inner fender forward in the front and back where the E-brake cable is.


A couple of turns on the bars doesn't hurt but u will have enough room anyway.


If u go to the wider rims u WILL have to trim the corners of the lower plastic valance.


I wore out a set of 285 on stock rims so the work fine.


But the H2 wheels sure look good and price is right.

Do any of you have any pics with 285 tires on a stock truck?http://www.dieselplace.com/forum/smileys/Ermm.gif


If you do please post them. Thankshttp://www.dieselplace.com/forum/smileys/Big Smile.gif

I've got a couple, but they are on H2 rims, 285/70R-17 same OD as 285/75R-16.


http://www.dieselplace.com/forum/uploads/79F_03gmc.jpg

This is the trimming for the wider wheels, stock was OK


http://www.dieselplace.com/forum/uploads/238_2gmc.jpg

Here's a Chevy


http://www.dieselplace.com/forum/uploads/8DZ_2003che.jpg

Here is mine. 285/75-16s with not so much as a cranked torsion bar.


http://www.members.cox.net/russhuffman/junk/2500hd.jpgEdited by: BadDog

Here's mine, I have the snow plow package so I didn't have to crank my T-bars or trim my air dam but, I did have to trim my right mud flap, it only rubbed while I backed up. The tires are 285/70-17 Goodyear Wrangler MT/R's on H2's I love them and would buy another set in a minute! As for the break in, I bought my truck with 3 miles on it and drove it home on the PA turnpike, not a highway you can do 50 mph on without getting run down! 12k on her now with no problemshttp://www.dieselplace.com/forum/smileys/Big Smile.gif





http://www.dieselplace.com/forum/uploads/DE2_rw.jpg Edited by: Rattlewagon

My current Chevy only needed the inside corner cut off to clear but the GMCs need more trimmed.


My new GMC is coming so I think I'll look into moving bumper forward an inch or so.


The inner fenders don't need trimmed, just tiewrap them out of the way.

Most of us that have 285's have been able to fit them on stock rims without rubbing. Cranking is probably mandatory though.

The break in procedure is described in the manual. That's probably the best way to do it.

Do you experience a difference in the ride after cranking the torsion bars?http://www.dieselplace.com/forum/smileys/Ermm.gif

I did when I cranked them too much; it rode like crap. To fix the problem I installed the green keys. Now, I have the height I want and the ride quality is pretty close to stock.

Be careful here. To me, tires need not to rub at all, even when turning and hitting a bump. Here is a pic of when I had 285s and 2" of T-bar crank. I had the parking brake cable tied back and the inner fender liners reformed and tied back as well. In this pic the steering wheel is turned about 3/4 of a turn.


I also had 8" rims. Our stock 6.5" rims aren't the best choice for 285s and the manufacturers all recommend a wider tire. However, the 8" rim amplifies the wheel well clearance problem. I now have a Rancho 4" lift and 295s with no run problems.


http://www.dieselplace.com/forum/uploads/F44_100_0164A.JPG

Got my new 2500HD ext cab today.


I want to put 285's on the stock rims. I have a 3.73 rear end. I calculate that the new tires will effectively make it a 3.46 when installed.


Does anybody know if this will effect the auto tranny shift points.


Am I going to kill the fuel economy or help it. ( when not hauling)


Its a better ratio at high speeds but I'm sure there is draw backs.


Thanks

I just put my H2s on my 04.5 GMC last nite and only had to trim the very corner of airdam, unlike the previous 03 GMC which needed 1" plus trimmed off.


I still give the bars a 'couple' of turns just to level it out some.

Here mine with 285's on stock wheels. I didn't trim or crank anything. Stock stance. Very slight rub on left front on back side of wheel well.


http://pic13.picturetrail.com/VOL487/437876/633189/25620738.jpg

Here is a link to both of my trucks with 285's. My 2000 Z71 used the stock 6.5" rims & required no trimming or cranking on torsions. My 04 2500CC needed both because of the use of a 8" Centerline Rim.

Here's the link
Bill's Trucks & Cars (http://community.webshots.com/user/redaple)

BillEdited by: Redapple

Here is what I found out today.


I just put 285 75 16 BFG KO's on my truck. When I turn the wheel all the way they rub pretty good. I will just need to trim the plastic and everything should be okay. I also have the stock rim on there. If you go with an aftermarket wheel that is wider or w/ more offset you will need to crank the t-bars or lift it. For all of you that replied you did not have to trim or crank anything, I am not sure how you the tires don't rub when you turnhttp://www.dieselplace.com/forum/smileys/Ermm.gif, but anyhow that's that. Thanks for the feedback