Help?

[Mike13601]

Hello all I’m Mike I’m new here I have a problem I have a 2018 ram 1500 6” rough country suspension lift running 37”X12.50R20 Federal Couragia M/T on Moto Metal Rims I’ve upgraded the struts to a lifted rough country and I’m on my 3rd alignment and 3rd set of tires they are wearing from middle of tire to inside within maybe 3 months does anyone know why?

 

[Joshua Collins]

Post up a picture of the latest alignment print out. Just a guess but probably time to find a new alignment shop or you have some parts needing replaced.

 

[VelocityC6Z]

Could be over inflated too... did a chalk test with my 37's at the recommended door psi just to educate the wife, and the outside two inches on each tire never touched the road lol...

Lowered the psi to 35 in the front and 32 in the rear and the chalk test was about as good as o could get it.

Just some food for thought, if you search for recommended tire psi based on weight of the vehicle, you'll find what the manufacturers recommend inflating to. C, D, and E rated tires on our 1500's is definitely not what it says on the door... unless you're trying to improve mileage at the expense of tire wear.

 

[Burla]

front or back or front and back tires.

 

[Mike13601]

Thank you I will look into the tire psi my local shop install the tires for me and they was set to 40lbs.

 

[Mike13601]

Front tires

 

[Burla]

Did you get upper control arms? 1500's don't have a solid axle, larger tires will throw you out of alignment more often then oem tires, especially when you start getting up to 37's. A solid king pin axle will cure that, but at what cost.

 

[Burla]

Thank you I will look into the tire psi my local shop install the tires for me and they was set to 40lbs.

40 psi is too much for some tires, and not very much for other tires, you have to look up your tires specific psi range. What load rating did you get? My guess is those tires should be fine at 40, but I need to know the range of that specific tire.

tires only last 3 mos? man, that is rough

 

[Mike13601]

This is the print out

 

[Burla]

That's not really middle right? Seams like middle all the way in?? That isn't psi if so, or just psi, that is alignment. psi would be exactly in the middle, like mine.

 

[Mike13601]

I have not replaced the upper control arms yet was told I didn’t need to

where do I find the load rating the tires says max load 3750lbs

 

[Burla]

So the suspension is all oem except a lift?? No beefy control arms or anything else? I think those 37's are beating up the oem suspension. or go down to 35's.

 

[Mike13601]

Oh no mine are from middle to the inside both fronts makes me think it’s just the alignment

 

[Mike13601]

Shocks and struts, outer tie rods are from the lift kit everything else is oem

 

[Mike13601]

It had 35’s on it and the lift when I bought it then I added the struts and shocks cause the tires wore out so fast then I got a deal on the 37’s when I had to buy 2 so I just got 4 37’s for just a little for money than just the 2 35’s

 

[Burla]

ply rating, sorry second symbol in is ply rating, so 4,6,8 or 10. Makes a huge difference in psi, but each tire will have a range. Below is max only, you need the range, it is tire specific.

Load Range Ply Rating Markings Maximum Load Pressure
B 4 B 35 psi (240 kPa)
C 6 C 50 psi (350 kPa)
D 8 D 65 psi (450 kPa)
E 10 E 80 psi (550 kPa)

My new tire is 10 ply so I can go to 80, but it is at 45, but for a B load oem tire that is way too much psi, even at 45.

 

[Burla]

It had 35’s on it and the lift when I bought it then I added the struts and shocks cause the tires wore out so fast then I got a deal on the 37’s when I had to buy 2 so I just got 4 37’s for just a little for money than just the 2 35’s

did the 35's wear the same? middle in?

 

[Burla]

I don't think it is psi, but give you that info so you can verify, don't go lower psi until you find the ply rating and range. You can clearly see this is a camber issue, and I would ask about beefing up suspension, those 37's are knocking the puny suspension with every turn. Call some suspension specific shops and ask them what upgrades would stop a ram 1500 from going out of alignment. I'd drive like a grandma as well.

You can also see it is positive camber on BOTH sides not negative, that is what happens when you lift trucks. Research that, it may be the lift or the way it was installed. Check the ball joints as well. One main reason for beefy upper control arm when you lift is to save the ball joints.

moving the upper control arm in or out (relative to the frame) is how camber is controlled, so those 37's are knocking the control arms out of whack. They set the camber and then it gets knocked out, why? Suspension travel plus big tires. Find a reputable local suspension shop. The way you go through tires, the fix will pay itself off in 3 months, lol. one mans opinion. good luck brother.

just happened into this.. The chevy looks to not be a solid axle, so it may have a ram option for that UCA.

 

[CheechDogg.0n37s]

If it was an alignment issue then in order for the inside of the tires to be worn like that you would have to have negative camber which he doesn't have according to the printout ....

But you can have an alignment shop give you more positive camber so that your tires move outwards from the top ....

Negative camber will make your tires look like this / and positive will make them look like this \ ...

Your toe though needs to be as close as it can possibly get to 0° ... toe in which you have and makes a difference needs to be fixed ... ..

Once you have that fixed you can then mess with the chalk test and adjust your air ....

 

[Burla]

But the camber is positive and the wear is what it is. Maybe it is the combo positive camber plus toe, dunno. Whatever is knocking the toe out and making camber positive needs to be fixed.