Cummins Diesel Forum banner

Reviewing TSB's for 1996

1150 Views 12 Replies 4 Participants Last post by  sootnsmoke
I was looking through TSB's for 96' and I found two uncorrected conditions on my 96' that match the TSB description exactly. My truck is all stock with 94k miles. Anyone have any more info on these two TSBs or info on thier technical/corrective action and verification?


Creaking noise from rear of vehicle.
The diagnosis involves the inspection of the rear leaf spring assembly to verify the appropriate
number of spring tip inserts are present. If tip inserts are broken or missing the repair procedure
is detailed in the TSB.



Droaning noise/vibration.
The symptom typically occurs at maximum load and is engine speed specific - 1900 rpm for 4x2
models, 1850 rpm for 4x4 models with the truck in fourth gear and the torque converter clutch
locked up. If the problem is identified, a repair procedure involving a revised propeller shaft with
a yoke weight damper is described.

94-’96 (BR)
With automatic
transmission and 5.9
Turbo Diesel engine.
Note: ‘96 2500 club
cab, 155 WB 4x4 with
heavy duty transfer
case built after 5/9/96
have the revised
propeller shaft.
See less See more
1 - 6 of 13 Posts
I drive a '96. It makes a lot more noises than those two, that's for sure.
Do you have spring tip inserts on your rear leafs?
Are you getting TSBs confused with recalls?
A TSB be is just a recommendation for dealer mechanics to diagnose or fix certain problems.
Thanks for the response. I understand the TSB is not a recall item. I was interested in getting any detailed technical diagnosis/fix info associated with those TSBs. I am assuming that it may be obtained but I am not sure where to go for it?
Usually the TSBs have the complete instructions when used in conjunction with pages in the factory service manual mentioned in the TSB
I have not been able to find anything in my FSM I got from Geno's regarding those TSB's. Also, in the brief TSB identification text I have not seen any page numbers referenced. I have only seen the TSB's described with a date and name/general description? If there is a location on line that has more than a date and name/general description I would love to find it.
Yes! I could not find the full description of those two TSB's anywhere I looked. I obviously did not get to :banghead:

Looks like I would need the updated yoke with dampner to eliminate the 1,800to 1,900 RPM heavy drone. The drone comes on strong and consistently when towing up a grade with torque converter locked in 3rd gear. When I first experienced it, I thought WOW, that is some serious harmonics with this powertrain in that condition. Thought it was just the reality until I saw the brief description of this TSB which outlines Dodge's fix for it. Can't imagine the cost for the updated part. Its too bad the original owner didn't get it fixed for no charge while under warranty. Guess its too late for that now? Seems like it should be a free fix since Dodge put out a part which replaces the defective one resulting in said condition. Alas, it is not a recall or a safety issue so I guess if you don't catch it before end of warranty you are out of luck. It may be more than I am willing to spend or do to fix it but its good to know it is a "normal" condition without running the updated yoke with dampner as shown in the TSB diagram. Thoughts?

TSB 03-03-96

Here is the other applicable TSB procedure/fix regarding the rear leaf creaking noise I have always wondered about. This is a interesting one as I have never owned a truck that does not have the factory leaf clamps or isolators at each end of the leaf pack. This one may be worth addressing. Very annoying. When loading or unloading weight from the bed or going slow over speed bumps with a camper hooked up, a very annoying and loud creaking during up and movement of rear. Again, thought it was just something that is a reality of the rear axle leaf design until I saw this TSB. Not sure how many other 94 to 98 owners have been bothered enough by it to fix. Obviously other have noticed it enough for Dodge to put out the TSB. Thoughts?

TSB 02-04-00
See less See more
Reading this you would see...

One person had the dreaded drone with one exhaust setup and eliminated it by changed the preload and hanger locations to stop the pipe from resonating and droning.

Clamp a piece of angle iron onto the straight pipe to change its weight and resonance to reduce and eliminate drone. Putting different lengths and weights may be required to find the sweet spot."

From TheDieselStop.Com Forums: Can I dampen my drone? Please!

""Do a search on "flex kits" and you may find your answer. My truck had a significant drone/resonance starting in the 1700 RPM range. After reading a couple of positive posts about installing a section of flexible exhaust I obtained a pre-made kit that consists of a 6" section of flex exhaust complete with the couplers and U bolts. I installed the kit last night and I am very pleased with the results. I cannot hear/feel the drone." (and) "The flex pipe eliminates about one third of the normal noise this truck makes" That makes sense as putting in a flexible pipe would change the resonance frequency of the exhaust system.

Another person glued lead sheet using liquid nails panel adhesive onto their roof. This was done because of drone using stacks. That helped the drone a lot. The roof can be a cause for excess noise in at least some cases.

Stock trucks are around 92-98 Db under load at 70 mph. (88-90db is where most say hearing damage starts) and this is more than enough to cause hearing damage over time."
If you read the TSB, the drone/vibration is caused by the PROPELLER SHAFT transferring normal powertrain actions. That is not to say that there may be other approaches to minimizing or eliminating this drone. However, its source is not exhaust or exhaust related at all (if you believe the engineers and the corrective action resolves the issue).
1 - 6 of 13 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.