2007 cupping on rear tires

So yea I got a 2007 with the 4.0 , I noticed some cupping on the inside of the rear tires anyone know what it comes from ? Any other info I forgot to mention just ask

130084 miles on the truck and I had the wheel bearings done approx 48k ago (not Oem bearings)

 

Shocks may be worn out.

 

How many miles on the tires? Have they been rotated? How much air pressure?

 

Are you sure the cupping didn't occur the the tires were mounted on the front end? The previous owner might have / probably did rotate them.

 

SHOCKS! That would be my first thought. How old are your shocks?

 

If not shocks and the tires got the wear on the rear: check the rear springs and bushings, look at the rear brake drums on outside and see if you have lost a weight (1-2 tacked welded on at factory for balance), and check tire balance or bent rim if steel.

 

Well I’m my opinion, I think the tires will cup no matter what. It’s kinda normal. I bought a 2015 with 45k and it got all new suspension installed. Installed new falken wildpeak at3. I did notice after 5k miles, the tires do look like they are cupping a little bit. So that’s why I rotate them every 5k. And now after 35k miles on the tires, they are still fine.

 

I rotate my tires and check tread depth at every oil change, which is at 5K miles. Tread wear is very even though it's not uncommon to see mild cupping on the fronts (most of my driving involves cornering ).
I haven't noticed any cupping on the rear tires.

 

Approx 25k / yes every 5 k / 34psi

I got the truck 3 years ago and as far as I know they are original with 130k on them

Ok , I just recently had the leaf springs replaced but I’m not sure if this started before I had that done

 

If you indeed have 130,000 miles on original shocks, they were toast many moons ago.

 

Yea ? I’ll have to check for any leaks , how else can you check ?

 

If you have 130,000 miles on the original shocks you don’t need to check for leaks or anything else. Those shocks are shot. You need to replace them whether they are causing the cupping or not. It is dangerous driving shocks like that.

 

As @Sprig and I have already stated, if they've got 130,000 miles on them, they're shot whether they're leaking or not. They do wear out internally after about 40,000 miles.

A less scientific and fairly subjective test is the old "bounce test." Get one corner of the vehicle bouncing up and down, then stop bouncing it. Generally speaking, it should stop bouncing in one or two cycles.

 

Ok didn’t know that , that’s why I’m here . Thanks ! So I I have to figure out how to change them , what to go with , and everything else

 

Rear shocks are easy to change. Front shocks are coilovers so are a bit more complicated. You'll find DIY threads as well as opinions on what to buy.

 

Easy, but don’t be surprised if you can’t get the top nut off with a wrench. Just grind or split it off if that happens.

 

I would try this first....I did mine and found 30 pounds of pressure worked best....

https://www.youtube.com/watch?v=eerIE_jTFSE

 

I could be wrong but 40k seems awfully short for shock life

 

For stock Oem factory shocks 40,000 to 50,000 miles is about right. For after market shocks they are better built, more heavy duty and should last much longer.

 

I can't find anything from Toyota on that but general recommendations I see are to have them inspected around that time and annually after.