Letter from GM - Allison / Duramax 2018 Crew Cab

EXSlider400 · January 25, 2019

While I appreciate the 72,000 mile extended warranty (I thought this would be covered under the 100,000 mile Allison transmission warranty), I don’t like the fact that they say don’t bring it to us unless you’re having this problem so basically they’re not going to even check and see if it’s wearing through. Does anybody know specifically where this is occurring (picture) so I can look for myself?

Edited January 25, 2019 by EXSlider400

newdude · January 25, 2019

Issue occurs where the two lines off the aux cooler fish through the bumper/radiator support/frame area. Rubs on the bumper bar frame bracket.

Grille off is the easiest view of it. Directly to the left of the aux cooler, in front of the radiator.

Edited January 25, 2019 by newdude

Capt Bob · January 25, 2019

That's pretty good. In 2003 the steering lines would eventually wear a hole in the intercooler boost tube.

EXSlider400 · January 25, 2019

Thank you for the information the grills on these are super super easy to remove so I’ll take a look.

grandpalarry777 · January 26, 2019

Does this extended warranty apply to all GM made 2018 trucks with the Duramax/Allison configuration or are there other factors involved? In other words, should everyone with a 2018 diesel receive this same notice - GMC and Chevy?

Thanks.

EXSlider400 · January 26, 2019

I’m pretty sure you only get the extended warranty if you get the letter...And so far only configuration is the crew cab with the Duramax seems to be the issue. But if someone else receives it, they can post it.

redwngr · January 28, 2019

On 1/26/2019 at 7:48 AM, grandpalarry777 said:

Does this extended warranty apply to all GM made 2018 trucks with the Duramax/Allison configuration or are there other factors involved? In other words, should everyone with a 2018 diesel receive this same notice - GMC and Chevy?

Thanks.

The way it's worded suggest their could be a serial number break in the affected vehicles -- so if affected a letter should be received.

On 'another forum' this issue was first posted about by an owner of a 2017 Dmax, so it seems that at least some 17's are affected as well.

Yes, both chev and gmc.

One of the shots posted:

Edited January 28, 2019 by redwngr

grandpalarry777 · January 28, 2019

Can these lines be seen from the front of the truck without removing the grille? With the grille guard installed it is a little more difficult to get the grille off.

Thanks

avalonandl · January 28, 2019

That picture looks like its from the bottom side....

paauto · February 1, 2019

To check on your own, you may want to remove the horizontal plastic fascia cover inside the hood. Will need to pry out the dozen or so push pin rivets and then lift the cover off (use a flat blade screw driver to lift the middle portion up, then use a pickle fork trim tool to pry the body of it up). Once you remove that fascia, you should have good visibility down between the radiator and grille. The potential rubbing would be on the left side as you look down (see pics in posts above). I noticed the issue in the summer on mine, when someone else on a different forum posted the issue. I put a piece of rubber hose between the frame bracket and pipe to protect it. I since purchased a kit from Deviant https://www.deviantraceparts.com/ProductDetails.asp?ProductCode=78400

which I haven't installed yet (too cold in Pittsburgh recently) to fix it.

ESMD · February 1, 2019

I've got a 2017 and got the letter today. I'm going to be proactive and order that kit before I have an issue. Too bad GM won't just fix a potential problem before it becomes a major problem!

EXSlider400 · February 2, 2019

On 31/1/2019 at 8:45 PM, paauto said:

To check on your own, you may want to remove the horizontal plastic fascia cover inside the hood. Will need to pry out the dozen or so push pin rivets and then lift the cover off (use a flat blade screw driver to lift the middle portion up, then use a pickle fork trim tool to pry the body of it up). Once you remove that fascia, you should have good visibility down between the radiator and grille. The potential rubbing would be on the left side as you look down (see pics in posts above). I noticed the issue in the summer on mine, when someone else on a different forum posted the issue. I put a piece of rubber hose between the frame bracket and pipe to protect it. I since purchased a kit from Deviant https://www.deviantraceparts.com/ProductDetails.asp?ProductCode=78400

which I haven't installed yet (too cold in Pittsburgh recently) to fix it.

Do you have to disconnect the lines to install the bracket?

paauto · February 3, 2019

4 hours ago, EXSlider400 said:

Do you have to disconnect the lines to install the bracket?

No, I don't believe you need to disconnect the lines. I will pull probably pull the grille off tomorrow and install the kit. Will take pics and post them.

paauto · February 5, 2019

On 2/2/2019 at 11:23 PM, paauto said:

No, I don't believe you need to disconnect the lines. I will pull probably pull the grille off tomorrow and install the kit. Will take pics and post them.

I installed the new bracket today. Very easy and it holds the line about a 1/4 of an inch off the bracket. Here is a picture of truck with the grille off of it. The factory bracket is in the lower left corner of the picture.

paauto · February 5, 2019

New bracket. Notice there is about 1/4 inch of clearance now between the lower line and frame. The factory bracket is a flimsy piece of plastic with a push pin holding it to the radiator support. This product uses stainless bolt and nut to securely pull the lines against the radiator support.

The directions that come with the Deviant product are very clear.

Edited February 5, 2019 by paauto