2019 rear axle alignment specs?

I’ve looked at a few threads on the topic of alignment and while there are plenty of specs on front wheel, I haven’t seen anything on rear.

There’s a bit of weird wear (scalloping of the inner tread on BFG TA KO2s) on the rear axle. Shocks only have 30k on them and the tire balance checked out ok. Not feeling anything weird (I’m totally OCD about wheel flutter and pull) and .17 degrees out seems inconsequential, but the left tire DOES have a little more wear than the rest. The front was well out of spec on toe out, but those tires are fine.

IS there even a rear axle spec?

Never had these issues on my ‘94 hilux. The new toy seems a bit more delicate

 

I'm sure there is a spec, check the FSM. Sometimes alignment shops will not even setup/measure the rear axle on trucks with a solid axle so it might be worth verifying that they actually checked the rear and didn't just print out whatever the machine was reading.

Has the rear axle/leafs/ubolts been removed or replaced?

 

Oh geez. THANKS!

You just triggered some processing circuits. The truck wasn’t on the rack 100% straight, so they likely just printed what the machine read, which could easily imply it’s probably around +.05 - +.06 degrees toe out on both sides and pretty neutral thrust angle. That should be totally inconsequential.

It’s the OE axle; never been touched and I don’t abuse the truck, but it does regularly leave pavement.

Which of course doesn’t solve the mystery low level scalloping. I made the mistake of leaving inspections and rotations to the (seemingly with-it) dealer and only casually looking at tires and such. Noticed it on my first post-dealer self inspection / oil change at 30k.

 

Are there 30k on the tires, too? If so, some irregular wear isn't surprising. How much difference in tread height, aside from scalloping?

 

Yeah, the tires have 30k on them. Pulled the stock ones off and replaced them the day after I bought the truck.

Tread depth is about 8mm throughout and the difference between the high and low points on the scallops is about 1.5+mm on one tire and about 1+-mm on the other. It looked worse in sunshine. Maybe nothing to be concerned about?

 

didn't think you can align a solid axle vehicle, nothing to adjust other than the leaf spring shackles and not sure why you would do that?

 

I believe there’s some minor shimming that can be done. I’m not so much interested in adjustment as in figuring out if something is bent.

I used my ‘94 in some interesting places and to the overloaded off road levels that made it popular with various <ahem> groups. Alignment stayed spot on despite the abuse and at 300k, similar bfg’s still wear evenly.

I’m trying to treat the new taco a bit gentler, but it does get a regular workout, and uneven tire wear comes from somewhere; just sequentially removing possibilities

 

Not sure this is relevant, but I had a Jeep Cherokee that I put a new set of BFGs on several years ago, and the left rear tire wore much faster than the rest. I as told that the BFG tires (rubber) were softer than other brands and that the left rear on all rear wheel drive vehicles tends to wear faster because when you are accelerating in making long left turns that is the wheel doing the pushing and most inclined to slip, even if minimally. The extra distance in left turns made the difference in wear.

It's the only set of tires I have ever noticed that kind of difference with. I put Michelins on the same vehicle next and never noticed the problem.

 

Nothing to worry about. PM me if you want a longer explanation.

 

That actually makes a lot of sense. The soft rubber is one of the reasons I’ve liked these tires historically for winter mountain driving. I also suspect the dealer may not have rotated the tires at 25k because they were in COVID overload and short staffed.

This truck definitely has more power than the 22RE which could translate to subtle but funky rear wheel wear.

I tend to keep vehicles until they die, so catching (or at least understanding) little stuff early on tends to pay off over time.

Already know this one probably wants regular alignment checks on the front end, and if it’s bfg’s rubber / tread combo then the wheels just need to be rotated. I don’t keep tires more than 45-50k anyway since worn treads and sharp rocks are a less than ideal combo when you have a bunch of people and toys floating around in back.