Pulling to left when shifting - '95 Trans Sport

I just had the steering rack & pinion replaced on my 95 transsport after 252,000 miles due to a bad leak.
After getting it back I have noticed that under acceleration it pulls to the left when shifting from low to second and second to drive. At times it is very noticable but at other times it doesn't seem to pull at all.
It also seems to develope oversteer if hitting a bump or dip when turning.
I also had new tires put on the same day.
The shop that replaced the rack said that they set the toe-in for proper tracking. Is there something that they may have missed or..............?
Is there anything that I should look for before calling the shop for an appointment?

Thanks,
Chuck

I would certainly scrutinize camber and toe in.
I have a very pactical way to verify toe-in (or toe -out..).ON this model toe in is set to practical zero. SO I look for a place where I can drive in straight line and some part of the travel would have one wheel running on sand covered asphalt while the other stays on clean asphalt. It toe in is zero, the car will keep exactly same direction when wheel runs over asphalt, then sand, then asphalt again. Any deviation indicates improper toe-in.
Unequal length half shafts will always pull on one side, but misalignment exacerbates this phenomena.