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I have about 26K miles and need new tires on my 2002 3500. (Sure doesn't seem like very good mileage on BFG tires that came on the truck when new. What is typical?) All info in manual and I have read on these sites says not good to change tire size because it will mess with Alli shift points, etc, etc. I have LT215/85R16 tires now and they look kind of small on this big truck so I would like to go bigger but just curious about what people who have increased tire size anyway have experienced. Don't want to do anything to effect performance towing my boat and hauling a truck camper for the sake of looks and I don't want to race.
 

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havent changed tire size yet as i am waiting to goto 19.5's. but what you need to know. 225 is the widest you can fit with stock rims no spacers. one of the mods has a 3500 with 235's but i believe he is running spacers. does it effect it, yes will it hurt the truck? dont think so. almost everyone is changing tire sizes, the truck will still shift just the same but you may notice a lot more speeding tickets due to the larger diameter tires. if you want to go for looks ya gotta bite the bullet on the 19.5's. everyones got 4k just laying around anyway right?Edited by: chevmeister
 

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tomtahoe When I put 285/75/R16 on mine I started to take them back.


Truck would hardly pull it's self.


Took Truck out and down shifted from (D)to (1) about three times at 50mph and noticed diffrence right away.


After about 100 mi. could not tell diff in power.


They just fit under front wheel wells wthout rubbing and no lift.


Hope this helps.
 

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I just went from 215/85R16 to 235/85R16 I have an '02 dually. I do not have any spacers on the rear wheels and I do not rub in the front. There is about 3/4" to 1" of space between the rear tires. If you plan to load the truck up heavy run MAX pressure in the rears. My speedo and odometer were about -3% off prior to the tire swap. I figured that the new tires are about +4% larger than stock so things should not be that bad. No shift or performance problems at all. It really is a shame GM did not use 235/85R16s as the stock size.

-Rick
 

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They call me the Breeze said:
Took Truck out and down shifted from (D)to (1) about three times at 50mph and noticed diffrence right away.




I thought it was determined that this really did nothing and was one of those old DMAX owners tales??





Anyone know if it really does a fast learn or not??Edited by: FirstDiesel
 

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They call me the Breeze said:
Took Truck out and down shifted from (D)to (1) about three times at 50mph and noticed diffrence right away.

Yeah, I think this theory has been put to rest. I'm not sure how it got started. My understanding is the only way to put the Allison in learn mode is with a Tech 2.


JoshEdited by: Smitty
 

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I went to 285/75-16 & at first I thought I screwed up.Then after a few miles it started doing better.Then I got the Predator & recalibrated tire size & it seems normal now.
 
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