Originally Posted by andrewwynn (Post 1123006)

Lots of what you described sounds like subframe bushings. Especially freeway thump from the rear.

Example: a distinct thump if on power up hill and hit a bridge expansion bump. Every time I'll get a thump that feels like a gear slipping a tooth. E.g. Instantly loose power and get it back.

The twist of the subframe does exactly that: for a split second when the car gets light on the spring power goes to twisting the subframe not pushing the car forward.

I also get a creak every time I start accelerating from zero as the subframe twists.


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Originally Posted by crystalworks (Post 1123042)

How many miles are on the truck? If over 100,000 then it's likely a driveshaft servicing is in order. I did both guibos and my CSB as well as greasing the splines on the shafts. Solved some noise issues I was having.

Note: your clunk sounds more like a rear bushing, just suggesting the above as part of maintenance.

Originally Posted by JokerElite (Post 1123325)

About 146k. This is good to know. Might go this route if I can't find an issue. Did you change auto/diff/tc fluids on yours? I was thinking of it but have been reading mixed results.

Originally Posted by nizz (Post 1123483)

I just changed the TF on my '04 4.4 n62 and wow what a difference. I use to get a loud thud and kick from the back end at lower speeds when slowing down and hitting the gas again. Small thumps are gone as well. I was hesitant as well being at 150k and never having done any tranny maintenance. Car shifts smoother than ever now.

Originally Posted by JokerElite (Post 1123484)

How many miles have you put on it since the fluid change?