Working the pinion angle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71meangreenc10 · 08-23-2010, 09:47 AM

Well,
Finally think I know why I have my vibration @ 55. Took some measurements of the driveline and found my trans is at 4 degrees and the rear pinion is @ 7. There is a shop close to me who is making shims so lets see how this turns out.

Smitty

Rollie396 · 08-23-2010, 08:35 PM

Be sure to post your results.I'm interested to know how it goes.

Tony@AirRideTech · 08-24-2010, 09:13 AM

That definitely sounds like it would vibrate by not getting adequate cancellation.

71meangreenc10 · 08-26-2010, 06:49 PM

Well,
The vibration is history, put in two four degree shims from Carls and got the pinion to 3.2 degrees and it rides like a new one. Carl is a great person to deal with, I ordered my Shims Tuesday and they showed up Wednsday afternoon. You cant beat that. Nice shims too, I wanted to take a pic but the wifey had the camera. Didnt have to move the panhard bar at all.

Here is his link if you want information.

http://www.stockcarproducts.com/trkarm1.htm

Smitty

**lolife99** · 08-26-2010, 08:29 PM

Just one question,... why do you think the pinion angle was off so far?
What had you done to the suspension and/or tranny mount?
Anything?

71meangreenc10 · 08-28-2010, 06:40 PM

I have no idea why it was off so much, everything went back together smooth, you could tell it was off just by looking at it, I verified it with a digital meter. Its a 3 speed manual mount, everything is stock besides the drive shaft, makes no sense, but I am going to look at everything again to see if there is anything that doesnt look right.

Smitty

08-23-2010, 09:47 AM	#1
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,159	Working the pinion angle Well, Finally think I know why I have my vibration @ 55. Took some measurements of the driveline and found my trans is at 4 degrees and the rear pinion is @ 7. There is a shop close to me who is making shims so lets see how this turns out. Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time

08-23-2010, 08:35 PM	#2
Rollie396 someday it will be done! Join Date: Sep 2004 Location: Lloydminster,AB. Canada Posts: 1,620	Re: Working the pinion angle Be sure to post your results.I'm interested to know how it goes. __________________ '72 C-10 Proud owner of a million new and used pieces that used to be and will once again be(god willing) a testament to the term "they don't build em like that anymore. '80 LWB 2wd beater '67 GMC long fleet (cab donor) '66 long step (parked till it's turn comes around) '65 short step (parts truck that will donate it's bed and possibly frame to the '66) '06 Grand Prix wife's car (she hardly lets me touch it) my pics

08-24-2010, 09:13 AM	#3
Tony@AirRideTech Junior Member Join Date: Feb 2005 Location: Huntingburg IN Posts: 620	Re: Working the pinion angle That definitely sounds like it would vibrate by not getting adequate cancellation.

08-26-2010, 06:49 PM	#4
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,159	Re: Working the pinion angle Well, The vibration is history, put in two four degree shims from Carls and got the pinion to 3.2 degrees and it rides like a new one. Carl is a great person to deal with, I ordered my Shims Tuesday and they showed up Wednsday afternoon. You cant beat that. Nice shims too, I wanted to take a pic but the wifey had the camera. Didnt have to move the panhard bar at all. Here is his link if you want information. http://www.stockcarproducts.com/trkarm1.htm Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time Last edited by 71meangreenc10; 08-26-2010 at 06:49 PM.

08-26-2010, 08:29 PM	#5
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,698	Re: Working the pinion angle Just one question,... why do you think the pinion angle was off so far? What had you done to the suspension and/or tranny mount? Anything? __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

08-28-2010, 06:40 PM	#6
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,159	Re: Working the pinion angle I have no idea why it was off so much, everything went back together smooth, you could tell it was off just by looking at it, I verified it with a digital meter. Its a 3 speed manual mount, everything is stock besides the drive shaft, makes no sense, but I am going to look at everything again to see if there is anything that doesnt look right. Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time



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