New tire pressure

Called the tire store and he gave me the load pressure numbers aim running 40 in the front and 45 in back while towing thanks or the help

One thing I didn't see addressed (if it was, I apologize). Are you using the stock rims? If so, are they rated to handle 80 psi? Back in late 90's, a 1/2 ton GM could be ordered w/ LT's.

I'd be concerned if your using "P" rated rims and have LT's on them and airing them up to 80.

My $.02

My last truck, a Chevy 2500, had the door sticker saying 60 front and 72 rear. I towed my 5th wheel at 80 psi and wore out the middle of the tires from over inflation. On my current 3500 dually it says 70 front and 65 rear. That is where I run it and my tires are wearing great. I'll keep my tires at whatever the door sticker says whether I'm towing or not.

You could use my motorhome-tire pressure calculator.
To be found in next map on my skydrive that belongs to my hotmail adress with same username as here.
Motorhome tire pressure calculator
First download the spreadsheet by RIGHT-CLICKINGand then choose download.
The spreadsheet uses the real loads or GAWR's and does not mind what tires where before on the car.
Mind that a stiffer tire as your 80 psi tire is , needs a higher pressure for the same load as a less stiff tire like probably your old where whith their 35 psi pressure needed for the maximum load.
If you cant work it out , give me the details , and I will do it for you.
50 to 55 could be the answer but I dont know wich loads you used.
Most certain you used a list wich gives optimistic loadcapacity for the pressure , as most American lists give.

Checked the charts your right 50 to 55 lb thanks

Your OEM P tires had around 2535 lbs capacity at 35 psi. Granted the tire may have a 44 psi max as my wifes P265/70-17 tires on her 1500 chevy but there is no load gain above 35 psi in a P tire. The higher 44 pressure stiffens the P tires sidewalls.

The LT E will have to be aired to 50-55 psi to get the same 2535 lbs capacity. Check out a load pressure chart for P and LT E tire.
A actual scaled weight is a better bet. Then use the chart and adjust pressure to meet the load.

Don't over pressure those 1500 truck wheels.

Ahhh the old chalk test. It don't lie.
Most all tire manufactures have a load inflation chart also. Like someone said your wheels might not even support higher inflation rates. JFYI mine have never seen more than 65 PSI, 45 rears empty. 80 PSI is like riding in a wagon for no reason :W

Got a great deal on them 450.00 out the door 50.00 to install and balance going to do chalk test see what that does for me

Also try to find out what the MAX PSI is for the wheels!!!!

I have had no issues running 50psi in my old 2k Chevy-16" Al Rim, or my '10 Chevy-18" Al rim, but not sure they are rated for 80 psi.

When I had my new A/T3's installed, I asked Discount Tire to look for a max psi in the wheel, but no info anywhere to be found on the stock rim.

Is there a reason you went with an LR E over a LR C?

Chris

Your door sticker is no longer relevant.

Call your tire shop and ask for the weighting scale for your tire. You'll have to weigh your rig fully loaded and then you can adjust your psi to the actual load.

That will be an extremely rough ride if you put 80 psi in them, besides being completely overkill for any load you will be putting on them.