3.75 back space

I have 3.75 inch back space on my 15" x 8" new wheels. I had to do some fender & flare trimming but they fit now. My question is how much more strain on the wheel bearings will these put ? I am going to repack them or replace them if they look worn. If I keep an eye on them will they be OK ? Factory BS was 5.25" on 7".
:wave:

Thank you

make sure the axleshaft nut is tight.
if they look bad buy two with the 1 year warranty, then in 10 or 11 months take the axle nut off drive for a few feet which will seperate them and return them. I have done this once, but by accident.

I run 3.75 BS on a 8" wheel with 33x12.5 and they are fine.