I just had a set of H2 BFG tires mounted and balanced, but now when slowing down below 15 mph or lightly accelerating to 15 (nothing at higher speeds) there is a shake that is fairly noticeable. Its not very violent but its there, any ideas what it might be?

 

Probably the new tires you installed. Get them rebalanced.

Maybe the imbalance was the reason they were takeoffs?

 

that or u joints are starting to go

 

i have found a number of things can cause it
Bad tire (belt)
or if the previous owner drove with a bad alignment
your alignment could be out
bad balance (do a high speed)

 

Find a shop that can do a force balance and check for radial and lateral runout.

Rusty