I have a 91 GMC Jimmy with 3.42 gears. The ring gear is missing teeth and I need to replace them. I have a d44 for the front with 4.10 gears and am looking for 4.10 gears for the rear. I went to the local speed shop to get 4.10 gears and they asked me what carrier I had. I dont know and an looking for the answer. I want to keep the 10 bolt cause it has a posi in it. I can pull the diff cover and look but I dont know what Im looking for. Any advice would help. Thanks.