Pinion angles? Squealing after static drop. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DBK81 · 03-30-2016, 12:15 AM

Did a static 3/5 drop and now have a squealing coming from the rear of the truck, very noticeable at low speeds, when I'm hard on the breaks it does let up, thinking either pinion angle is off or possibly carrier bearing? Any thoughts? I'm also running the stock panhard bar, wondering if that would cause issues on a 5" drop?

Ruscal · 03-30-2016, 01:28 AM

Squealing sound doesn't seem like a pinion angle problem. More like a tire contacting bed or body parts. You should check your pinion angle compared to your harmonic balancer. should be the same. As to the panhard rod you can do some measuring at ride height to see if the wheels are centered to the frame. The aftermarket bars are adjustable, so you could adjust out any centering issues.
Russ

cdowns · 03-30-2016, 08:01 AM

wwhen you did the drop did you shorten the driveshaft so it doe\sn't bottom out in the ranny tailshaft??

snipescastle2 · 03-30-2016, 08:08 AM

Good call, lot less driveshaft travel when lowered.
Ben

DBK81 · 03-30-2016, 08:29 AM

I didn't adjust the driveshaft, something I should look at?

DBK81 · 03-30-2016, 08:58 AM

Update: great news, it's neither the panhard bar, carrier bearing or the driveshaft, crawled under (which is hard when it's lowered haha) and now that it's lowered its moved the drive shaft further up into the frame and it has slightly come into contact with the passenger side muffler, a quick adjustment to the muffler hanger and problem solved.

03-30-2016, 12:15 AM	#1
DBK81 Registered User Join Date: Jan 2016 Location: Saskatchewan Posts: 357	Pinion angles? Squealing after static drop. Did a static 3/5 drop and now have a squealing coming from the rear of the truck, very noticeable at low speeds, when I'm hard on the breaks it does let up, thinking either pinion angle is off or possibly carrier bearing? Any thoughts? I'm also running the stock panhard bar, wondering if that would cause issues on a 5" drop? __________________ 1972 C10 - It might be old, but it's not slow Last edited by DBK81; 03-30-2016 at 12:42 AM.

03-30-2016, 01:28 AM	#2
Ruscal Registered User Join Date: Jun 2013 Location: Carlsbad, California Posts: 165	Re: Pinion angles? Squealing after static drop. Squealing sound doesn't seem like a pinion angle problem. More like a tire contacting bed or body parts. You should check your pinion angle compared to your harmonic balancer. should be the same. As to the panhard rod you can do some measuring at ride height to see if the wheels are centered to the frame. The aftermarket bars are adjustable, so you could adjust out any centering issues. Russ __________________ RC

03-30-2016, 08:01 AM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Pinion angles? Squealing after static drop. wwhen you did the drop did you shorten the driveshaft so it doe\sn't bottom out in the ranny tailshaft?? __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

03-30-2016, 08:08 AM	#4
snipescastle2 Registered User Join Date: Mar 2009 Location: WARRENSBURG,MISSOURI,64093 Posts: 1,518	Re: Pinion angles? Squealing after static drop. Good call, lot less driveshaft travel when lowered. Ben __________________ "Persistence is the twin sister of Excellence.one is a matter of quality,the other, a matter of time" “Serious Black” my 1971 Short Bed Fleetside Sold to an outstanding man in Lees Summit,Mo. “Gone, but by no means,Forgotten”

03-30-2016, 08:29 AM	#5
DBK81 Registered User Join Date: Jan 2016 Location: Saskatchewan Posts: 357	Re: Pinion angles? Squealing after static drop. I didn't adjust the driveshaft, something I should look at? __________________ 1972 C10 - It might be old, but it's not slow

03-30-2016, 08:58 AM	#6
DBK81 Registered User Join Date: Jan 2016 Location: Saskatchewan Posts: 357	Re: Pinion angles? Squealing after static drop. Update: great news, it's neither the panhard bar, carrier bearing or the driveshaft, crawled under (which is hard when it's lowered haha) and now that it's lowered its moved the drive shaft further up into the frame and it has slightly come into contact with the passenger side muffler, a quick adjustment to the muffler hanger and problem solved. __________________ 1972 C10 - It might be old, but it's not slow



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