P1039..help me out

So my SES light just came on and this is what my xcal pulled up. Im pretty sure the place who installed my 3.73's damaged one or both of the abs sensors in the rear end cause my brake pedal would pulse when I slow down, but it doesnt do it when I pull the abs fuse which disables abs.

Is there a speed sensor on the trans somewhere that might be bad either?

New abs sensors are $70 from vatozone so could I grab them from another car with the 8.8" in it from a junkyard. Like a CV or something like that.