$150 sounds about right for a shop to do it. IIRC I paid around $70 for mine at the dealer.
Its not a real tough job and there are great instructions somewhere on here that show exactly how to do it.
I did a couple of them and I can finish it in 15min and not work real fast.
If youre on here HEAVY you probably are mechanical enought to do it. All you need is a 15MM socket
I used the GM grease kit @17K now have 36K not a sound/rattle from the intermediate shaft. Took me 20-25 minutes. Do a search and I think you'll find people having better success with greasing. Lots of pix this site in the DIY section. Good luck.
A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more!