Searched around the net and cannot 100% confirm that the Apikol rear-differential mount will fix this issue. Anybody on here replaced this and noticed that the thump was gone. I can't stand the car jerking when shifting into second gear and seeing the shifter move when giving it gas. Thanks.

 

I get the same thump sometimes. Mostly coming on onramps when accelerating in second. Was about to do a little research into it. In your reading did you find it to be pretty common?
I bought a snub mount last week, not sure if this will fix it. I think I read a couple forums that it did fix some odd noises/movement guys had. Keep posting if you find anything, I'll do the same.