So I finally got my Dmax back after it was in the shop twice for rear housing and transfer case issues. Truck was OK up until last week, was towing a small enclosed trailer with some furniture, after I was done towing, I started getting an annoying high pitched squeak whenever I go over a bump. Sounds like it's only when I hit a bump on the right side, but I can't be sure. I can hear it clearly in the cabin, seems to also have gotten worse over the week. Has anyone had something like this? It is driving me crazy and any help would be appreciated.

I had a problem like that and it was after driving on logging trails. I couldn't figure out where it came from, but I greased all 11 points and within about a day it was gone. Hasn't been back since. You might want to see if your spring isolators on the rear springs are there (on the overloads).

I'll check that out, thanks.

Suspension - Squeak Noise From Rear of Vehicle

Bulletin No.: 06-03-09-004

Date: June 02, 2006

TECHNICAL

Subject:
Squeak Noise From Rear of Vehicle (Lubricate Rear Leaf Springs)

Models:
1999-2007 Chevrolet Silverado (Classic)
1999-2007 GMC Sierra (Classic)

Condition

Some customers may comment about a squeak noise coming from the rear of the vehicle. During normal operation, certain vehicles may exhibit a squeaking noise that may be traced to the rear leaf springs. While this noise is an operating characteristic of leaf springs, the frequency and severity of this noise will be affected by the roads that the vehicle is driven on.

Cause

This condition may be due to debris getting between the leaf springs.

Correction

To correct this condition, lubricate the rear leaf springs using the following procedure.

Important: It has been found that the application of grease to the rear leaf springs does a better job of preventing the noise from reoccurring than replacement of the spring.

1. Raise the vehicle on a frame lift-type hoist.

2. Inspect the springs for damage. If none is found, proceed to the next step.

3. Pressure wash the rear leaf springs to remove as much dirt and grit as possible.

4. Dry the springs with compressed air.

5. Apply a liberal amount of grease, GM P/N 12345996 (in Canada, use P/N 10953501), under the front and rear tip inserts for the # 2 and # 3 leaves, on top of the tip inserts, and in between the # 1 and # 2, and # 2 and # 3 leaves, as indicated below. A screwdriver can be used to gently pry up the tip insert; however, a rag around the screwdriver must be used to prevent damage to the spring. Use a flat-bladed tool, such as a gasket scraper to properly distribute the grease.

6. Lower the vehicle to the ground and test drive to verify the repair.

Please inform the customer that this will offer relief, it is by no means a lifetime repair. Periodic cleanings and grease re-application may be necessary throughout the life of the vehicle.

For 1500 Series (1/2 ton) models only: On vehicles built prior to October 2004, if the above procedure does not correct this noise, it could be caused by an incorrectly dimensioned splay clip (the band holding the ends of the leafs together) that interferes with the leaf springs. A 5 mm (0.197 in) wider splay clip was introduced in early 2005 model year to provide additional clearance. To correct this concern, replace the rear leaf spring assembly. There was no change to the part number.

I hope this helps ya, I wish i could include the pics

Thank you very much!! I will check this out for sure.

Thank you very much!! I will check this out for sure.
No problem!! :D