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#1 |
Registered User
Join Date: Jan 2010
Location: Katy Texas
Posts: 501
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vibration......
hey all, I've got a quick question, I recently had my rearend rebuilt with new bearings/seals, new gears and a posi unit. Its got 4.10 gear ratio. the issue is now that its back in the truck I'm feeling a vibration that wasn't there before. It doesn't really occur until about 60-70 mph and you can only really feel it on deceleration. Should i be concerned? Im debating taking it to a different shop and having them redo it but don't know if this is a necessary thing. Any help would be great....
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#2 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: vibration......
If nothing else but the rear was changed I would start there. Also check the driveshaft and U joints.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#3 |
*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: vibration......
A quick fix might be to unhook the driveshaft from the pinion yoke, rotate it 90 degrees and bolt it back together. I usually mark the position of the driveshaft on the yoke before I pull one apart to ensure I reinstall in the same position. Maybe the shop didn't.
Keep doing this (unbolting and rotating 90 degrees and taking for test drives) until the vibe goes away or you end up back to the original position (be sure to mark the original position so you don't forget). Might be an easy fix.
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Tom ![]() Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... |
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#4 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: vibration......
If by chance you have a 2 piece driveshaft and it was separated and then slid back together without being lined back up exactly how it came apart (on the splines), it is now out of phase and will need to be rebalanced.
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#5 |
Registered User
Join Date: Jan 2010
Location: Katy Texas
Posts: 501
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Re: vibration......
thanks guys, gonna mess with it in a few minutes, ill keep you posted
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#6 |
Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,052
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Re: vibration......
What gears were in it before the rebuild ? if you had 307 the shaft speed is much higher now than before
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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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#7 |
Registered User
Join Date: Jan 2010
Location: Katy Texas
Posts: 501
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Re: vibration......
it was 308's, u joint looked great as it should with 700 miles on it, flipped it 180 degrees and will try that
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#8 |
*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: vibration......
Oh yeah going from 3.08 to 4.10. That does increase driveshaft speed significantly, which turns a small imbalance into a big one. I've been through that before. I've even had it going from 3.08 to 3.42. You may need to get the thing rebalanced if re-phasing it does not make a difference. Pretty common for doing gear changes on old iron. I've had it done at least 3 times in the past several years on different vehicles. There is a truck chassis shop about 20 minutes away from me. They can rebalance a drive shaft in about an hour for under $50. They can do car and truck drive shafts. Look for one near you. Might not be as big of a deal as it sounds to get done.
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Tom ![]() Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... |
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#9 | |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: vibration......
Quote:
Find a good driveshaft shop. Having it balanced isn't a bad idea regardless if that is the cause of your problem. Its not very expensive and making sure the driveshaft is spinning true is insurance for the rest of the drivetrain.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#10 |
Registered User
Join Date: Jan 2010
Location: Katy Texas
Posts: 501
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Re: vibration......
thanks guys, ill do that. I just had the driveline built not long ago, so ill give them a call. my main concern was if the rear diff had a problem as it was the last thing to get rebuilt and thats when the vibration started.
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#11 |
Registered User
Join Date: Apr 2014
Location: Fate, Texas ( About 35 miles east of Dallas)
Posts: 318
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Re: vibration......
I have the same problem, never really noticed a vibration except for a slight vibration coming and going like pulsing. Changed to 3.73 gears on the series 3 carrier with the thick gears from Richmond. I used the pro gear set. replaced the bearings set preload and backlash. preload was around 22 inch pounds on the pinion without the ring gear installed. Specs called for 25 so figured 22 would be fine. Set backlash to .008, specs called for 7-9. Ran for about 125 miles doing the break in as instructed. First 15-20 miles pinion was running around 160 degrees. Let cool down and took it for another 15-20 miles came back measure temp and it was down to around 140 with laser temp gun. Let sit over night and ran another 30 miles this time got home and temp was around 120. Problem I am having is a vibration comes in around 55 getting pregressively worse the faster you go. Had a new drive shaft put in about 1000 miles ago. Have rotated the driveshaft 180 degrees and vibration is still there. I read where someone said to rotate 90 degrees each time. Not sure you can do that with one piece ds. It does make sense that it is worse now as the shaft is turning faster. Went from 3.07 to 3.73. Gear wear pattern after 150 miles looks great. I guess maybe I should take the driveshaft out and get it "re-balanced" again? Could the spider gears cause this. When they fell out I might not have gotten them back with the same washers as it all fell out on the floor. Gears are not making any noise at all. The vibration gets worse when I push the clutch in and coast.
Any ideas? Thanks Ron |
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#12 |
Registered User
Join Date: Jan 2010
Location: Katy Texas
Posts: 501
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Re: vibration......
sounds like the same setup i used ronw435, I haven't been able to get mine up to speed and see if anything changed after the 180 swap on the ujoint but hopefully this evening. Im running a new 1 piece shaft that i had built when i did the motor swap, The vibration didn't show up until the diff was rebuilt and regeared. Also had the rear wheels rehooped to set the backspacing where i wanted it. I think if it was the wheels id feel it more often though?
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#13 | |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: vibration......
Quote:
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#14 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: vibration......
Quote:
If you are off anything on the on the balance or driveline angles, you will find a vib, that you never saw ,even @ 100 mph +! longhorn
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#15 |
*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: vibration......
If you have any doubts about the wheels, get them balanced. It could be an issue that only shows up at higher speeds.
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Tom ![]() Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... |
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#16 |
Registered User
Join Date: Jan 2010
Location: Katy Texas
Posts: 501
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Re: vibration......
took the wheels down to get the balance checked. guy said they were definately off. Will drive it to work tomorrow and see if that was the culprit
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#17 |
Registered User
Join Date: Jan 2010
Location: Katy Texas
Posts: 501
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Re: vibration......
wheels and tires weren't the issue, driveshaft gets rebalanced tomorrow........
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#18 |
*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: vibration......
Sounds like the tires needed balanced anyways. So that will at least help them (and your suspension) last longer. Keep us posted.
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Tom ![]() Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... |
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#19 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: vibration......
Getting closer.
![]() Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
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#20 |
Registered User
Join Date: Jan 2010
Location: Katy Texas
Posts: 501
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Re: vibration......
ok! vibration is gone.... stupid simple issue. I didn't realize it but somehow the joint caps, which have a teflon washer at the end of the cap, got switched around during the reassembly. Not a big deal except somehow the teflon washers both ended up in 1 cap. Obviously that throws the joint out of center......... Ez fix though and now i can drive it again
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#21 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: vibration......
Sweet!
![]() ![]() Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
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#22 |
Registered User
Join Date: Apr 2014
Location: Fate, Texas ( About 35 miles east of Dallas)
Posts: 318
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Re: vibration......
Wow good for you aboesec10. Took driveshaft out again and took it to be "re-balanced". They told me I had a bad rear ujoint and re balanced the drive shaft. The ujoints were new about 5k miles ago. Put the ds back in took for a ride and it is a little better but the vibration is still there. Has anyone had any problems with wheels from LMC? I have the six hole chrome blade wheels and replaced one because it seemed to be out of round when I got the tires balanced. You could actually see the out of round on the machine. I know this could contribute to the vibration problem but was wondering if anyone has had any problems with their(LMC) wheels?
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#23 |
*** That's interesting ***
Join Date: Oct 2008
Location: Pittsburgh, PA
Posts: 2,772
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Re: vibration......
Can you try swapping a known good set of wheels and tires from another truck? Otherwise you may be chasing your tail...
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Tom ![]() Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... |
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#24 |
Registered User
Join Date: Apr 2014
Location: Fate, Texas ( About 35 miles east of Dallas)
Posts: 318
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Re: vibration......
Storm I really dont know anyone that has a set of 6 lug wheels near me.
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#25 |
Registered User
Join Date: Jan 2010
Location: Katy Texas
Posts: 501
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Re: vibration......
I agree with storm, thats a quick way to tell if thats the culprit. Newer gm 6 lugs will fit your truck as well.
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