There is one? Do you have the number? I checked the Alldata list and
didn't see anything to do with vibration.
Dale
Bernd D. Ratsch wrote:
> Have you looked at the driveline vibration TSB (been out since 1998).
>
> - Bernd
>
> -----Original Message-----
> From: owner-dakota-truck@bent.twistedbits.net
> [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Dale Schultz
> Sent: Saturday, October 25, 2003 6:29 PM
> To: dakota-truck-moderator@bent.twistedbits.net
> Subject: Re: DML: Vibration in Chassis (very very long post)
>
>
>
> Tony Cellana wrote:
>
>>Another possibility I forgot to mention is pinion angle. If the
>>pinion angle is off, it can cause some movement and/or binding in the u
>
> joints.
>
>>Not sure what the specs are on pinion angle for the truck. If it is off
>>from ideal, pinion angle shims can be purchased, and installed between
>>the axle and spring.
>>
>>TonyC
>>
>
> Hi:
> I used a steel protractor and a small bubble level to measured this. I
> forgot to put the info in the original post.
> At the transfer case yoke I measured 8 degrees clockwise from vertical. At
> the transfer case on the drive shaft, 8.5 degrees from vertical. At the
> pinion yoke, 6.5 degrees from vertical.
>
> From what is in the Field Service Manual an angle under 5 degrees is
> acceptable for a shaft that spins up to 3500RPM.
> My angle calculates as:
> Front: 8-8.5 = -0.5
> Rear: 8.5-6.5 = 2.0
> Final angle difference: 2.0-0.5 = 1.5 degrees
>
> The FSM also indicates that GOOD cancellation is within 1 degree and
> that there should be at least 0.5 degrees of continuous operating angle.
>
> I think mine is okay except for the fact that the angle at the front and
> the rear are not that close to each other to cancel out the phasing of
> the shaft. Maybe the transmission mount has settled some causing the
> angle at the front to drop. I could replace the mount or shim the axle
> 1 degree.
>
> Anyone know what the typical angles are on a one-piece drive shaft?
>
> I'm pretty sure that I have either a drive shaft run-out problem or the
> pinion bearings are worn (possibly due to a drive shaft run-out problem).
>
> Thanks.
> Dale
>
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