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Old 08-17-2011, 05:43 PM   #1
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Tire Balance

Will one out of balance tire on the drive axle vibrate a Class A?
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Old 08-17-2011, 08:19 PM   #2
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I'm running four unbalanced tires (the rears) and don't notice it at all. On the front you could probably feel it in the steering wheel though so they're balanced.

The rears are 275/70 22.5's the fronts are 305/70 22.5's I don't need the extra capacity on the rear and there was over $100 per tire difference in price.
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Old 08-17-2011, 09:16 PM   #3
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Quote:
Originally Posted by Mr_D
I'm running four unbalanced tires (the rears) and don't notice it at all. On the front you could probably feel it in the steering wheel though so they're balanced.

The rears are 275/70 22.5's the fronts are 305/70 22.5's I don't need the extra capacity on the rear and there was over $100 per tire difference in price.
Thanks mr D. I'm just hoping for an easy vibration solution I crawled under and listened to my u joints today and didn't hear any knocks when shifted to drive and reverse by my wife. Glad she didn't let off the brake.
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Old 08-17-2011, 09:23 PM   #4
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Have you lubed the driveshaft U-joints and slip joint? They are pretty critical due to the short length in a rear engine. Spartan used to say once a year, now the say every 5,000 miles or once a year which ever comes first. Even so I do them twice a year.
I ruined the front seal on an Allison once (under warranty) probably because I didn't know about the lube requirements.
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Old 08-17-2011, 09:28 PM   #5
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Good idea. The rig is new to me and they didn't appear greased up. What is the procedure for lubing the slip joint. Is there a zurk?
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Old 08-17-2011, 11:32 PM   #6
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Yes, there is a zerk near the center of the driveshaft in the valley under the U-joint toward the front of the rig. Or at least there is on our 2002 on Spartan chassis. You pump lube in till it comes out the vent hole at the back of the driveshaft (toward the engine). You should also find zerks on the U-joints themselves. I just pump enough lube in to them to get new lube to show around the bearings. Check your owners manual for the correct grease. I'm at work right now and I don't remember the correct grease.
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Old 08-18-2011, 07:22 AM   #7
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Much appreciated. I'll check my manual after work today. Sounds like our chassis should be quite similar as mine us a 99 Spartan.
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Old 08-18-2011, 08:10 AM   #8
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I run my four rear 225r19.5 bridgestones unbalanced too. Had them mounted up in May and the shop said that they don't balance the rear duals.
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Old 08-18-2011, 08:23 AM   #9
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To properly grease a driveline, there should be no pressure on it what so ever. First, chock the wheels. secondly, put the shift lever in neutal an release the emergency brake. This is the only way to grease a driveline. Have been a heavy duty truck mechanic for thirty five years an never losed a u-joint. When it's under pressure or the splines in the slip joints are under pressure your are not getting grease to all the journals. Use a good quality grease.
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Old 08-18-2011, 08:28 AM   #10
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An another think, when greasing the font end, always jack it up, to grease the king pins and steering linkage
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Old 08-18-2011, 06:20 PM   #11
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An another think, when greasing the font end, always jack it up, to grease the king pins and steering linkage
I'm checking my OM and can't find a grease spec. Any recommendation?
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Old 08-18-2011, 09:01 PM   #12
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Never mind I found it NLGI#2 Thanks for all the input I hope it helps my problem.:dance:
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Old 08-21-2011, 09:15 AM   #13
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A badly out-of-balance or out of round tire will cause a vibration no matter where it is. But it would have to be way out to cause a noticeable problem on the drive axles. Many people don't balance those at all (but I do).
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Old 08-21-2011, 10:35 AM   #14
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Thanks for the input. Since it doesn't vibrate 100% of the time and the u joints appear ok. I think I'll make an appointment with Rocky Mtn Cummins.
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