MP2k

I just got new Yokohama SDrives put on the rear and now the car pulls pretty hard on acceleration and deceleration. Tire pressures are the same, thats the first thing I checked. I did notice that one of them was made in Japan and the other was made in the US. I've checked the wheels, axle nuts, and looked for slack in the suspension. I'm thinking it has the be the tires. The Potenza RE960AS that were on there always tracked straight. These are damn scary on the 3-4 shift at speed, it wants to swap lanes almost.

Billman250

I think if the tires came from different molds, then that is definitely your problem.

Only takes a few psi difference to make the car pull, so I'd imagine tires from different molds would be worse than unequal tire psi.

zeroptzero

are the tires on the proper side of the vehicle given the directional pattern ?

MP2k

Yep

Stealth Operator

Sounds like one tyre is manufactured either before/after the other tyre, meaning that you have 2 different tyres in 2 different conditions. One from Japan and one from US doesn't help either. Same model, same thread but it does not equate to same compound. Not the same tyre essentially.

MP2k

Went back and got the US tire swapped for a Japanese one and that fixed it.