Pinion Angle Help. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72MARIO · 07-18-2005, 09:51 PM

Oky well it's not a 73 but it a 72 with leafs. You guys will be more help to me than the others. I have 2" shackle and 3" dearched overload spring removed. 6" Drop. I have a slight vibiration around 75 MPH +. How did you correct the incorrect pinion angle ? I haver seen shims but are the useable with trucks ?

Thanks for the help,

Mario

82c10 · 07-18-2005, 10:02 PM

i don't know, but my friend has dropped 2 driveshafts in his 80 shortwide in less than a year, he knows it is beacuse of his pinion angle, first he was racing a kid on a local street (my friend) had a mild 355, the other guy had a 350 with a couple add-ons, he won, and lets off the peddle , the rearend of his truck lifts up three feet in the air, he lands sideways, with it bouncing all over the road, he saves it, then he fixed it,drove it for a while, then sold the 355 to his friend, then he bought a 327 shortblock built for racing that used a 250 shot every weekend, he never used NOS with it thought , anyways he was racing a brand new 05 Mustang GT and smoked it, lets off the gas, and boom! drops the driveshaft again, broke the transmission bellhousing, broke the driveshaft, he couldn't even find part of the driveshaft but now he sold the 327 and last time i talked to him he was building a 434

cynergygoon · 07-19-2005, 12:42 AM

i have a 80 model stepside lowered about 5 inches in the back and i got a vibration at about 6500 rpms or so after i did that. it never done it before i lowered the truck so i know its not in the motor. this really only affects me when im racing but i took the rearend out and cut the spring pads off and welded new ones on to where they lowered my pinion angle. pinion angle was at +1 before now its at -4 or 5. not real sure if this fixed it yet since i havent got it together to take it out and try it. i should be trying it this weekend if it fixed it i will let you know. the shims will work but i needed more then the 1 or 2 degrees they offer and i dont think you should stack them or you will have all kinds of problems hope this helps some. jason

**Captkaos** · 07-19-2005, 10:19 AM

The shims are availible for anything. Trucks aren't different. You just need your pinion angle between 3-4 degrees.

72MARIO · 07-19-2005, 04:18 PM

Oky I will look into the shims. SHould fix that minior problem.

**Captkaos** · 07-19-2005, 05:21 PM

That should have read Trucks AREN'T different....

72MARIO · 07-20-2005, 04:15 PM

No worries I read it as Are not. I some time just add a word. Seriously.

Thanks for the correction thought.

07-18-2005, 09:51 PM	#1
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Pinion Angle Help. Oky well it's not a 73 but it a 72 with leafs. You guys will be more help to me than the others. I have 2" shackle and 3" dearched overload spring removed. 6" Drop. I have a slight vibiration around 75 MPH +. How did you correct the incorrect pinion angle ? I haver seen shims but are the useable with trucks ? Thanks for the help, Mario __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

07-18-2005, 10:02 PM	#2
82c10 needin' money Join Date: May 2005 Location: Chickasha, Oklahoma Posts: 1,106	i don't know, but my friend has dropped 2 driveshafts in his 80 shortwide in less than a year, he knows it is beacuse of his pinion angle, first he was racing a kid on a local street (my friend) had a mild 355, the other guy had a 350 with a couple add-ons, he won, and lets off the peddle , the rearend of his truck lifts up three feet in the air, he lands sideways, with it bouncing all over the road, he saves it, then he fixed it,drove it for a while, then sold the 355 to his friend, then he bought a 327 shortblock built for racing that used a 250 shot every weekend, he never used NOS with it thought , anyways he was racing a brand new 05 Mustang GT and smoked it, lets off the gas, and boom! drops the driveshaft again, broke the transmission bellhousing, broke the driveshaft, he couldn't even find part of the driveshaft but now he sold the 327 and last time i talked to him he was building a 434 __________________ *SWB Stands for Short Wide Bed*

07-19-2005, 10:19 AM	#4
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	The shims are availible for anything. Trucks aren't different. You just need your pinion angle between 3-4 degrees. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com Last edited by Captkaos; 07-19-2005 at 05:22 PM. Reason: Meant to say AREN'T different.

07-19-2005, 04:18 PM	#5
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Oky I will look into the shims. SHould fix that minior problem. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

07-19-2005, 05:21 PM	#6
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	That should have read Trucks AREN'T different.... __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

07-19-2005, 12:42 AM	#3
cynergygoon Registered User Join Date: Jun 2005 Location: LEBANON MO Posts: 21	i have a 80 model stepside lowered about 5 inches in the back and i got a vibration at about 6500 rpms or so after i did that. it never done it before i lowered the truck so i know its not in the motor. this really only affects me when im racing but i took the rearend out and cut the spring pads off and welded new ones on to where they lowered my pinion angle. pinion angle was at +1 before now its at -4 or 5. not real sure if this fixed it yet since i havent got it together to take it out and try it. i should be trying it this weekend if it fixed it i will let you know. the shims will work but i needed more then the 1 or 2 degrees they offer and i dont think you should stack them or you will have all kinds of problems hope this helps some. jason

07-20-2005, 04:15 PM	#7
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	No worries I read it as Are not. I some time just add a word. Seriously. Thanks for the correction thought. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD



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