02-19-2013, 04:33 PM | #1 |
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Driveline vibration
I have a vibration in the drive line on my Suburban and after reading think it may be due to the pinion angle. I am running a 4'" rear spring with a two inch lowering block. The drive shaft was just shortened and balanced since I changed to a 700R4 tranny. It also has new u-joints and a new CPP billet carrier bearing. What is normally done to correct the pinion angle. Unfortunately the shop is 80 plus miles away and I need the burb back right away so I am looking at alternatives to returning to their shop. Do you think the problems are due to the long wheel base of the burb?
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 Last edited by BB72CHEVKT; 02-19-2013 at 08:54 PM. Reason: grammar |
02-19-2013, 05:02 PM | #2 |
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Re: Driveline vibration
A couple of things that can be checked/verified @ home... Make sure u-joints are phased correctly. If not, that can cause vibrations. Also check the trans/driveline angle vs. pinion angle. They should be equal yet opposite or as close as possible.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
02-19-2013, 05:35 PM | #3 | |
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Re: Driveline vibration
Quote:
I'd definitely check the U-joints first. Posted via Mobile Device
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02-19-2013, 05:37 PM | #4 |
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Re: Driveline vibration
How can I tell if the U-joints are phased correctly? Sorry for my ignorance. The rear end seems to be tilted up too much toward the burb floor is another reason for thinking pinion angle.
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
02-19-2013, 05:41 PM | #5 |
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Re: Driveline vibration
In phase....
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. Last edited by SCOTI; 02-19-2013 at 05:47 PM. |
02-19-2013, 05:44 PM | #6 |
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Re: Driveline vibration
I don't know if this will help but here are a few pics.
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
02-19-2013, 05:51 PM | #7 |
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Re: Driveline vibration
Only way to know is to measure w/an angle finder. Measure the differential pinion angle & the trans pan angle (easiest part of the motor/trans to measure).
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
02-19-2013, 05:56 PM | #8 |
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Re: Driveline vibration
Thanks that second pic help explain better. It looks real close. Is it either right or 180 out with no in between?
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
02-19-2013, 07:44 PM | #9 | |
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Re: Driveline vibration
Quote:
It can be felt on a single shaft set-up so the 2pc set-up most likely multiplies the issue (I've never personally done the 2pc driveline on my trucks but have looked into possible concerns since my CC dually will be my 1st).
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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02-19-2013, 08:54 PM | #10 |
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Re: Driveline vibration
I am a little curious. Why do only some trucks need to shim the pinion and not others? I would think it would be an all or none situation.
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
02-20-2013, 09:38 AM | #11 |
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Re: Driveline vibration
Subjective... Some set-ups it's more noticed than others. A lwb, 2pc driveline, & OD trans would likely be more sensitive to vibration vs. say a lwb, 1pc, & a standard 1:1 3spd trans.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
02-21-2013, 07:57 AM | #12 |
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Re: Driveline vibration
you should measure your pinion angle at the pinion yoke (usually removing the driveshaft) and at the transmission tailshaft. Not the pan (although the pan rail would work)
You should be around 6 degrees( split evenly between the trans and diff 3 degrees each only opposite) total. You would probeley adjust the rear with taper shims under the lowering blocks and you can raise the trans mount (or lower the crossmember) to correct the trans.Maybe they got the wrong tranms crossmember? One more thing, If you have an IPhone they have several angle finder apps that are free and work excelent |
02-21-2013, 11:00 AM | #13 | |
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Re: Driveline vibration
Quote:
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 |
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02-21-2013, 12:04 PM | #14 | |
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Re: Driveline vibration
Quote:
http://www.stockcarproducts.com/
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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02-21-2013, 01:34 PM | #15 | |
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Re: Driveline vibration
Quote:
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71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 Last edited by BB72CHEVKT; 02-21-2013 at 02:52 PM. |
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