Drive shaft issues pinion angle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jgmc · 03-05-2015, 11:18 PM

I have a 1972 Gmc 1500 long box. The truck has 4" drop springs and 1" blocks in the rear. I raised the carrier bearing (the hanging rubber style) to the high position on the cross member, has anyone else done this? Do people use pinion shims? What does everyone do?

67 chevelle · 03-06-2015, 12:20 PM

I have a 5 3 drop on my 68 long fleet . Did not change anything , not even the panard bar , I have not had an issue

Lee H · 03-06-2015, 04:02 PM

Get ahold of an accurate angle finder and do some checking. Many good youtube videos to learn how to check. Check the pinion and trans angles. You should shoot for 2-3% down on trans and 2-3% up on diff. Much more or less and you will see driveline vibration. Combinations of drops and aftermarket trans cross members and mounts will change the angles. Also measure the diff and see if it's centered.

Z10 · 03-07-2015, 01:19 AM

A friend of mine showed me an app for my phone by Tremec which includes a drive line angle finder. It's free for iPhone. Tremec Tool Box. It measures and calculates.

03-05-2015, 11:18 PM	#1
jgmc Registered User Join Date: Jan 2005 Location: Brier Washington Posts: 121	Drive shaft issues pinion angle I have a 1972 Gmc 1500 long box. The truck has 4" drop springs and 1" blocks in the rear. I raised the carrier bearing (the hanging rubber style) to the high position on the cross member, has anyone else done this? Do people use pinion shims? What does everyone do?

03-06-2015, 12:20 PM	#2
67 chevelle Registered User Join Date: May 2013 Location: WEST PALM FLORIDA Posts: 1,174	Re: Drive shaft issues pinion angle I have a 5 3 drop on my 68 long fleet . Did not change anything , not even the panard bar , I have not had an issue __________________ 68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive

03-06-2015, 04:02 PM	#3
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,147	Re: Drive shaft issues pinion angle Get ahold of an accurate angle finder and do some checking. Many good youtube videos to learn how to check. Check the pinion and trans angles. You should shoot for 2-3% down on trans and 2-3% up on diff. Much more or less and you will see driveline vibration. Combinations of drops and aftermarket trans cross members and mounts will change the angles. Also measure the diff and see if it's centered. __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

03-07-2015, 01:19 AM	#4
Z10 Registered User Join Date: Aug 2012 Location: Midland, TX Posts: 1,267	Re: Drive shaft issues pinion angle A friend of mine showed me an app for my phone by Tremec which includes a drive line angle finder. It's free for iPhone. Tremec Tool Box. It measures and calculates. __________________ 1969 RS/SS Z10 Camaro Pace coupe 1972 GMC Short Step buildhttp://67-72chevytrucks.com/vboard/s...=1#post6356218 1979 Mazda RX7 1979 Pontiac Trans Am WS6 & 1979 Pontiac Trans Am 10th Anniversary 1999 Honda Valkyrie 2006 Corvette Z06 2010 BMW 650i

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