xfer case drop - The 1947 - Present Chevrolet & GMC Truck Message Board Network

85 K5 · 04-30-2003, 07:48 AM

When I installed a 2" lift on the 85 Blazer I noticed a vibration from the rear drive shaft. New u-joints didn't fix the problem so I dropped the case using the spacers that were above the crossmember mount, put them under the frame. All is well, no vibration. Question is I should not have needed to do that with a 2 " lift and 33x12.50 tires. I don't like how it looks. If I were to have the driveshaft balanced and tested would I be able to put the case back to it's original position? I also noticed the ujoint replacement was not easy. Bearing caps were stubborn, I might have a problem there. It's ran 30k miles like this I just am tired of seeing the crossmember hanging down underneath.

**JIMs70GMC** · 04-30-2003, 07:55 AM

Get a cv style rear drive shaft. Then you would be able to remove the spacers. For the rear did you use tapered blocks or new springs? I had a 2" lift on an 85 and the rear block was tapered and I had no vibration problems. Just a thought.

85 K5 · 04-30-2003, 08:13 AM

Used tapered blocks. Was your 85 a Blazer, a swb or a lwb?

6869704X4 · 04-30-2003, 08:24 AM

Check out the links for driveline angles in the 12bolt carnage thread. Thats the method I used when I put new perches on my axle. They didnt come out perfect but, no vibrations. I got it within 2 degrees. I also took my shims out.

PS: swb or lwb Blazer? I thought they were all the same.

85 K5 · 04-30-2003, 09:04 AM

Sorry about the wording - a Blazer, or a short wheel base pickup or a long wheelbase pickup. All are different.

Thanks for the replies.

**JIMs70GMC** · 04-30-2003, 10:03 AM

My 85 was a K5, I have a 70 lwb now. I believe i have a pic in the link in my signature of the k5 I had.

04-30-2003, 07:48 AM	#1
85 K5 Registered User Join Date: Nov 2002 Location: Spring TX Posts: 113	xfer case drop When I installed a 2" lift on the 85 Blazer I noticed a vibration from the rear drive shaft. New u-joints didn't fix the problem so I dropped the case using the spacers that were above the crossmember mount, put them under the frame. All is well, no vibration. Question is I should not have needed to do that with a 2 " lift and 33x12.50 tires. I don't like how it looks. If I were to have the driveshaft balanced and tested would I be able to put the case back to it's original position? I also noticed the ujoint replacement was not easy. Bearing caps were stubborn, I might have a problem there. It's ran 30k miles like this I just am tired of seeing the crossmember hanging down underneath. __________________ 350 Crate 10 bolt 3.73 2.5 lift 32x11.50 1904 Edelbrock http://www.oplnk.net/~spirit/K5front.jpg

04-30-2003, 07:55 AM	#2
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Get a cv style rear drive shaft. Then you would be able to remove the spacers. For the rear did you use tapered blocks or new springs? I had a 2" lift on an 85 and the rear block was tapered and I had no vibration problems. Just a thought. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

04-30-2003, 08:13 AM	#3
85 K5 Registered User Join Date: Nov 2002 Location: Spring TX Posts: 113	Used tapered blocks. Was your 85 a Blazer, a swb or a lwb? __________________ 350 Crate 10 bolt 3.73 2.5 lift 32x11.50 1904 Edelbrock http://www.oplnk.net/~spirit/K5front.jpg

04-30-2003, 08:24 AM	#4
6869704X4 Registered User Join Date: Jul 2002 Location: SE NM Posts: 769	Check out the links for driveline angles in the 12bolt carnage thread. Thats the method I used when I put new perches on my axle. They didnt come out perfect but, no vibrations. I got it within 2 degrees. I also took my shims out. PS: swb or lwb Blazer? I thought they were all the same. __________________ The more I learn about women, the more I love my truck.

04-30-2003, 09:04 AM	#5
85 K5 Registered User Join Date: Nov 2002 Location: Spring TX Posts: 113	Sorry about the wording - a Blazer, or a short wheel base pickup or a long wheelbase pickup. All are different. Thanks for the replies. __________________ 350 Crate 10 bolt 3.73 2.5 lift 32x11.50 1904 Edelbrock http://www.oplnk.net/~spirit/K5front.jpg

04-30-2003, 10:03 AM	#6
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	My 85 was a K5, I have a 70 lwb now. I believe i have a pic in the link in my signature of the k5 I had. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.