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new truck, looking for some advice

newbie dmax owner

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newbie dmax owner New Member

newbie dmax owner

Posted
Posted

Proud owner of 05 GMC 2500hd crew cab with the duramax/allison trans. Bought because it is so tough and want to be able to haul the boat and soon to be camper where ever and when ever. Dealer installed a set of BFG 285-75-16's and made the truck look alot better. I do have several questions I would appreciate some help with. Salesman was not very knowledgable and this is my first diesel anything.

- Do I need to have the DIC reset due to speedo and odometer changes from the larger tires ? If not , how to figure mph so as to avoid the pesky troopers.

- Am I supposed to break the truck in easy and slow like a gasser?

- How long do you break a diesel in ?

 

 

By the way, did I mention that this thing is bad!!

wpatrus Enthusiast

wpatrus

Posted
Posted

I don't know about the break in period on the diesel, mine is a gasser. But I do have the 285's and you do have to fix the speedo problem. I bought a hypertech programmer to compensate for the difference in size- works great and I know how fast I am going. I don't believe the dealer will fix that for you- thats why i went with hypertech.

GMC6000 Enthusiast

GMC6000

Posted
Posted

Take your truck back to the dealer, when I upgraded from 245 to 265 tires, it took them about 10 minutes to reprogram the speedo and didn't cost me anything. As far as break in, just drive it normal, but do not pull any loads for the first 2,000 miles. Avoid lots of idling time, as you want to get and keep engine temps up to normal for the rings to properly seat. After about 2,000 miles, pull all you want.

2004GMC2500HD Enthusiast

2004GMC2500HD

Posted
Posted

I have 285/70/17's on my 2500 HD with the 8.1 / allison. My speedo is correct at 30 mph, reads low by 3 at 40, 4 at 50, 5 at 60 and 6 at 70. So if my speedo says 70 I am going 76. Thats been verified by "those pesky troopers". Ok so I used a radar and verified it myself.

 

Don't know if yours will read the same, but this might give you some insight on how fast you might actually be going. So you can fend off "those pesky troopers." :thumbs:

lrymal Senior Enthusiast

lrymal

Posted
Posted
Take your truck back to the dealer, when I upgraded from 245 to 265 tires, it took them about 10 minutes to reprogram the speedo....

 

 

I think their speedo adjustment ability tops out with 265 tires, though, not the 285s.

banshee42096 Enthusiast

banshee42096

Posted
Posted

break in period for the d/a is 500 miles never

staying at constant speeds alway very up and

down. also think cant go over 55mph the first

500 all in the owners manuel.i did here the same

thing about the tires dealer only will go to 265-75

r16 on speedo change.i went with 265s and drove

with a gps at 70 it was sying i was going 71 1/2 i

was told though that gps are not very accurate eith

er so i dont know what to believe good luck :thumbs:

whitesnake01 Enthusiast

whitesnake01

Posted
Posted
break in period for the d/a is 500 miles never

staying at constant speeds alway very up and

down. also think cant go over 55mph the first

500 all in the owners manuel.

 

 

 

Saw similar things. 500 plain, 500 tow then change fluid in your rear diff. Ditto with speed as posted by others. Change engine oil at the same time. At 5K, change oil in engine, rotate tires and change Allison spin-on filter. Wait until 10K. Rotate. Change over to synthetic.

 

You might find it helpful to take detailed notes about your truck's performance, if you have the DIC option. That might help you determine when the truck is out of line. I also have a new 05 2500hd. I am trying to determine how much fuel is really left in the tank after it starts to warn. So far, it looks as if the yellow light and warning comes on as a function of the sending unit in the tank. Consequently, the "fuel used" is not always at the same mark when you get the low fuel reading. Mine still undershoots, as far as estimated fuel used. But it appears to get closer and closer to real values. It is currently about 0.8gal off (e.g, I have to add 0.8gal more at the pump than the "fuel used" claimed I had used).

 

Welcome!

wpatrus Enthusiast

wpatrus

Posted
Posted
Is the programmer easy enough to use for novice. How much would one expect to pay for the programmer.

 

 

 

 

 

The programmer is easy to use- there are other brands as well but I have only used the hypertech so far. I can't remember cost- I think it was in the $300 range (but that was for the 6.0, might be different on DMax for some reason-don't know)

Good Luck at whatever you decide

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