I have noticed that my Teg (98 RS) will pull to the right a bit under hard acceleration after upshifting. Is this just an effect of having an open diff? I thought Tegs used equal-length half-shafts, so the pulling surprised me a bit.....?

 

open diff

 

its most likely the open diff., but also can be the caster in your suspension.

 

Caster...hm. It tracks arrow-straight the rest of the time, so it's probably the diff...interesting nonetheless.