Need Help with a vibration in my Jimmy - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jeff r · 12-09-2011, 09:28 PM

I have a 1972 GMC Jimmy auto with 4wd. I bought the Jimmy 6 months ago and it had a old tires on it. I replaced the tires with 31" tires.

When the Jimmy gets to 55mph I can feel a vibration in rear. I had my father-in-law follow me today and he said the right rear had a wobble.

I lifted the Jimmy and shock the tire and had a little play up and down but couldn't feel any side to side. I also check the other side and it was tight. I can't here any noise going down the road.

Is it the rear end or bearing?

Jeff

Mike C · 12-10-2011, 11:02 AM

A wobble in the rear is neither. You have something bent. Either a wheel or axle. Swap wheels side to side and have father-in-law follow again. If wobble changes side, wheel. If not, axle.

You can set up a fixture using a dial indicator also on a fixed stand and put the indicator on the axle flange (truck on jackstands and wheel off) and rotate and check runout. Needs to be really level for accuracy, but if you can see the wobble it's way off.

jeff r · 12-10-2011, 12:56 PM

I jacked up the jimmy this morning and pulled on the tire and the axle has play. I can pulled it out and push it in. (very little movement but some) the movement is not really a wobble the axle just has play in and out. I can't shake the tire just pull it in and out and little movement up and down not side to side. The other side has no movement or play. I'll jack it up and try it.

Jeff

jeff r · 12-10-2011, 06:07 PM

Thanks Mike

It was a tire/rim issue. I rotation the tires and problem moved to the front. I'm getting my Jimmy set-up. I'm going to post some pics when I finish in a couple of weeks.

Jeff

69TowRig · 12-19-2011, 01:23 AM

The play on the rear axle in-out is normal. The 12-bolt is a C-clip axle and there is always a little bit of slop in the shaft. A lot of axles are like this.

capev86 · 12-22-2011, 10:31 PM

so what you're telling us.....you have a Shimmy in the Jimmy?!!

sorry, that line came to mind and i had to let it out!!!

jeff r · 12-24-2011, 11:48 PM

No more shimmy in the Jimmy. Its running smooth.

Jeff

12-09-2011, 09:28 PM	#1
jeff r Registered User Join Date: Sep 2011 Location: kill devil hills, NC Posts: 27	Need Help with a vibration in my Jimmy I have a 1972 GMC Jimmy auto with 4wd. I bought the Jimmy 6 months ago and it had a old tires on it. I replaced the tires with 31" tires. When the Jimmy gets to 55mph I can feel a vibration in rear. I had my father-in-law follow me today and he said the right rear had a wobble. I lifted the Jimmy and shock the tire and had a little play up and down but couldn't feel any side to side. I also check the other side and it was tight. I can't here any noise going down the road. Is it the rear end or bearing? Jeff

12-10-2011, 11:02 AM	#2
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,723	Re: Need Help with a vibration in my Jimmy A wobble in the rear is neither. You have something bent. Either a wheel or axle. Swap wheels side to side and have father-in-law follow again. If wobble changes side, wheel. If not, axle. You can set up a fixture using a dial indicator also on a fixed stand and put the indicator on the axle flange (truck on jackstands and wheel off) and rotate and check runout. Needs to be really level for accuracy, but if you can see the wobble it's way off. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

12-10-2011, 12:56 PM	#3
jeff r Registered User Join Date: Sep 2011 Location: kill devil hills, NC Posts: 27	Re: Need Help with a vibration in my Jimmy I jacked up the jimmy this morning and pulled on the tire and the axle has play. I can pulled it out and push it in. (very little movement but some) the movement is not really a wobble the axle just has play in and out. I can't shake the tire just pull it in and out and little movement up and down not side to side. The other side has no movement or play. I'll jack it up and try it. Jeff

12-10-2011, 06:07 PM	#4
jeff r Registered User Join Date: Sep 2011 Location: kill devil hills, NC Posts: 27	Re: Need Help with a vibration in my Jimmy Thanks Mike It was a tire/rim issue. I rotation the tires and problem moved to the front. I'm getting my Jimmy set-up. I'm going to post some pics when I finish in a couple of weeks. Jeff

12-19-2011, 01:23 AM	#5
69TowRig Senior Member Join Date: Jan 2005 Location: Raleigh, NC Posts: 894	Re: Need Help with a vibration in my Jimmy The play on the rear axle in-out is normal. The 12-bolt is a C-clip axle and there is always a little bit of slop in the shaft. A lot of axles are like this. __________________ -Chris Building a stripper, one part at a time: 1969 K5, 307, 3spd, 3 seats, hard top. Added Pwr Discs, Pwr Steering, Aux Battery, T-case Skid, Lighted Sidemarkers, HEI, Lock-Right Diff, ECE Class IV Hitch, 32" MT/Rs. Parts to Install: Hand Throttle, Console, Tow Hooks, Dual Horns, AM-FM, Dealer Swing-Away Tire Carrier, Gas Tank Skid. Also building a 1950 Willys CJ-3A and off-roading a 2001 Nissan Frontier on 1-Ton Portals...

12-22-2011, 10:31 PM	#6
capev86 Registered User Join Date: May 2009 Location: Eliot, Maine Posts: 1,314	Re: Need Help with a vibration in my Jimmy so what you're telling us.....you have a Shimmy in the Jimmy?!! sorry, that line came to mind and i had to let it out!!!

12-24-2011, 11:48 PM	#7
jeff r Registered User Join Date: Sep 2011 Location: kill devil hills, NC Posts: 27	Re: Need Help with a vibration in my Jimmy No more shimmy in the Jimmy. Its running smooth. Jeff

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