aod tv adjustment

I had the gears in my 87 lx changed from 3.27 to 3.73's...right after this the car started making a thumping sound that sounds like it's coming from the rear end, but it mainly does this when shifting into OD. Does changing the gear ratio affect the tv setting or could it just be bad u joints. the tranny was rebuilt about 3 months before the gear change. thanks