ive repaired a similar issue with that kit. that tsb may not apply to your exact jeep. sometimes the problems blend into other years though. i looked up that part number and its description is "shaft". it should go for about 30-40$. order it in and see if it helps. when it comes to old tsb's for older vehicles its common that we dont see them since the jeep was new. in this case, the jeep is 13 years old. looksl ike the part would take a few days to arrive. were there any other issues that could cause the noise?