hey everyone , i just bought an 89 k5 with 350 and 700r trans. it has a 4inch lift and 35in tires. the previous owner said the gears in the back no longer match the front. the rear was replaced with a junkyard rear. the front gears are the original. can i still drive in 4wd like this??????? if not how do i find what gears are in the front so i can match the rear??????