Axle wrap update - 2013 F150
04-03-2015, 11:12 AM
#11
Senior Member
Is that question to the original poster or to me? If directed to me; yes I've had the TSB done x2 times. Once they did the procedure to replace the pinion seal and reset the pinion lash, second time resulted in a brand new replacement drive-shaft. In both situations the clicking/popping has returned and those bandaids only last for 5k miles or so 
Wayne
04-07-2015, 05:05 PM
#12
TSB is not for the axle wrap issue which in FORD's case usually occurs on the supercrew trucks with the 6 foot box.
My 'fix' stops the rear axle from rotating upwards by forcing the lower half of the leaf pack to engage the upper half of the leaf pack sooner. It does this via a bump stop that replaces the OEM pads. Does it work....100%, but I have only tested it while unloaded.
If you do not already know the axle wrap is caused by the leaf springs not being able to stop the rotation of the axle. This results in the drive shaft and the differential being so severely out of alignment that they bind. This binding causes a vibration that is usually felt as you accelerate away from a stop. Severe axle rotation can result in a truck that cannot be driven. Being stuck in the sand is usually the worst and the entire truck will literally jump up and down violently.
My original set up used the ultra low bump stops at the back and the low's at the front. This made the ride very harsh. I then moved the ultra low bump stops to the front and re-installed the factory pads at the back. This set up works great. The ride is almost back to normal and the axle wrap is still gone.
My 'fix' stops the rear axle from rotating upwards by forcing the lower half of the leaf pack to engage the upper half of the leaf pack sooner. It does this via a bump stop that replaces the OEM pads. Does it work....100%, but I have only tested it while unloaded.
If you do not already know the axle wrap is caused by the leaf springs not being able to stop the rotation of the axle. This results in the drive shaft and the differential being so severely out of alignment that they bind. This binding causes a vibration that is usually felt as you accelerate away from a stop. Severe axle rotation can result in a truck that cannot be driven. Being stuck in the sand is usually the worst and the entire truck will literally jump up and down violently.
My original set up used the ultra low bump stops at the back and the low's at the front. This made the ride very harsh. I then moved the ultra low bump stops to the front and re-installed the factory pads at the back. This set up works great. The ride is almost back to normal and the axle wrap is still gone.