So I stopped by my local tire store (Discount Tire) and was looking into getting some new tires. I bought my car with new Toyo proxes 4's in the rear and some ****ty kumos in the front. Theres not that much thread on the front tires at all.

As the Tire guys fallowing me to me car hes like "4x4 right"...Um AWD I tell him YES! This is when he precedes to tell me that I can blow out the Transfer case buy not having equal amounts of thread on all four tires!? I never heard of this before, is this true? I just wanted to a set of 2 more Toyo proxes 4's for the front to match all around...couldent I just do that?

 

Uneven amount of tread on tires could indeed lead to T-case failure. Has something to do with the unequal amounts of RPM's the four different tires encounter with having such a fraction less of tread across the board (therefore changing the radius and putting stress on the T-case which normally leads to the DEATH WHINE!) hopefully someone can chime in a little bit more technical...

Other factors:
Incorrect launching habits
Incorrect fluid
Wheel hop

 

First, it's tread, not thread.

You want as close to even tread on all 4 tires as you can get. If your old tires are nearly new, then you'll probably be fine with just 2 new tires.

 

https://www.evolutionm.net/forums/ev...-vehicles.html

 

Good info thanks man!

 

So Will I be fine driving this way until I can get new tires? I have a shep st.2 t-case.

 

^what's the timeframe untill you can get new tires? and is this your daily?

 

Yeah its my daily driver. I only work like 5miles away, I could get new tires for the front (which is what I need, cuz theres like no tread left). In Like next week.

 

tough call chief...i think my t-case started whining due to this

 

I don't think it's the ring and pinion that gets destroyed when the wheel speeds vary. That is the part which creates the "death whine". What will take all the load from wheel speed mismatch is the viscous coupling. The actually center diff is in the tranny and probably won't be affected.

 

So If I just bought some New Toyo proxes4's for the font in the same size etc... would I be fine? The rears are like brand new with 3k on them. Id hate to buy 4brand new tires when the ones in the rear are semi new lol

 

ummm, my buddy has 255/40 in the back and 245/40 on the front... he popped a tire so bought 2 255's, and will get the other 2 later. But from wat ppl are saying, he's gonna mess the t-case up??

 

Your friend better either buy matching tires or start saving up for a new transfer case.

 

If the Toyos only have 3k miles on them you'll *probably* be fine to buy two new ones (put the new tires on the front) and once all the tread depths are even keep them regularly rotated for uniform wear.

 

Thanks guys for all the info!! I will get new tires ASAP