Dorman 917-561 Rear Transfer Case Housing Compatible with Select Cadillac / Chevrolet / GMC Models

I installed the Dorman 917-561 rear transfer case housing on my 2001 Chevy Silverado 2500HD that has the 6.0L gas engine, 4L80E 4 speed auto transmission and the NP246 transfer case. It was a very high quality die cast aluminum with no casting flash and was machined cleanly. Dorman actually included color photos and instructions that were pertinent and important. I highly recommend also installing the Merchant Automotive 10001 transfer case pump upgrade. It is machined billet alum plate to bolt onto your oil pump and it will stop the oil pump from wearing pin holes in the rear of your case. The case fit perfectly and all bearings were already installed in the case! Do not buy the other brand cases that have bad reviews on the internet of not fitting back together properly (2 guys pounding it back together with hammers and blocks of wood). I removed the transmission cross member, rear cross member for the torsion bars and removed the t-case from the truck to change out the rear case. There is a large snap ring that fits in a groove in the rear output shaft area in the case, and a mating groove in the rear output shaft bearing. It is located under a rubber plug on top of the tail housing of the case. This snap ring has to be expanded in order to separate the two case halves. It would be difficult to access the snap ring from the top with the t-case still in the vehicle and nearly impossible to correctly reinstall it. Do yourself a huge favor and buy the 11" lock ring / snap ring pliers to expand this snap ring. A typical 8" lock ring plier used to expand lock rings on transmissions will possibly expand the snap ring enough to separate the case halves, but it does not have enough spread to expand the snap ring far enough to engage it in both groves to correctly install the 2 t-case halves. I had to use screw drivers (inserted through the 2 holes for the vehicle speed sensors) to get in front of the rear output shaft bearing and pry it up or rearward enough to engage the snap ring between the rear case and the rear bearing groove. A plastic tool is recommenced, but did not provide enough leverage in my situation.

I just bought this 2005 Silverado 2500HD with 160,000 miles. Noticed a leak on the transfer case. I was aware of the pump rub issue but was hoping for just a leaking rear output seal. I ordered this Dorman replacement half case kit just in case and pulled the transfer case anyway to inspect. Good thing I did! Looks like someone was in there already and had installed 2 upgraded anti rattle clips. 1 was broken and half of it was stuck to the pick up magnet. The other was in place but was too big for the arm of the pump plate it was stuck on. Regardless, the pump plate ate notches in 3 of the 4 saddles. The 5 o'clock positioned saddle was the worst and when I shined a flash light from the inside of the case, I could see the pin hole that was leaking. Couldn't see it from the outside. Lucky I caught it before things got worse. I also installed the "Merchant Auto" case saver kit on the pump rather than using the 4 steel clips that come with this Dorman kit. Didn't feel comfortable with them and I don't want to have to do this shitty repair again. The speed sensor hole and everything was machined perfectly to match up with the original front case and accessories. 1 major tip. Get yourself an 11inch retaining ring/ snap ring pliers. Will need it for the main shaft access slot on top to release the rear case and the pump retaining ring if you choose to swap out the plate. Can buy one on Amazon for $20

Worked well for my 2001 Silverado transfer case that wore through.

Worked perfectly no issues other than non tapered drain plugs but just put pipe tape on them 2005 gmc sierra slt crew 4x4 260k mi

Product very well made, like OEM, price is great and came complete with instructions.

fit like factory part.

It fit perfectly on my 2007 Chevy LTZ Suburban and there were no issues. I had the pump rub problem and used this with the Merchant Automotive pump upgrade kit. I did not run into the VSS issue that some others spoke of in their reviews. It's possible the issue was fixed by Dorman or maybe some reviewers torqued their VSSs down too tight? I read that the VSSs only needs to be tightened to 10 ft lbs. The case half comes with everything you need and it is extremely helpful to have the drive shaft bushing and needle bearing pre-installed. It fits as good as the factory OEM. No leaks. Highly recommended.

Bought this for the pump rub pin holes that were in my transfer case. The hardest part was getting the transfer case in and out by myself but other Han that it’s pretty straight forward. There are some videos on YouTube showing you how to replace the half and to put a pump saver in. I just sec the clips hay we’re with the new case because they seemed pretty heavy duty. So far, 2000 miles down and no leaks!

This worked great for my 98 suburban np246. I used the merchant auto motive pump plate with zero issues. Sensor holes were correct depth. Buy some new bolts too mine were bad shape. Overall excellent part and great price

Fit perfect. I would recomend and use again

THIS CASE HALF, MADE IN CHINA, DOES NOT FIT LIKE THE ORIGINAL GM CASE HALF. Impossible to get Merchant Auto upgrade kit in or shim kit. Hopefully it will not eat this case half out again.Shipping was exceptionally slow, 3 weeks USA to Canada.