folks,

i've started to notice something on my truck that seems odd to me. when the truck is cold and i pull up to a stop sign, then let off the brake pedal i get a thunk that emanates from the rear of the truck. you can actually feel it, almost like the truck lurges when you let up the brake pedal. the sound/feel almost entirely disappears once the truck has warmed up. the sensation to me feels as if the rear brakes aren't releasing as fast as the fronts and then all the weight and forward inertia of the truck is placed on them before they release...

anyone else notice similar behavior with their s-crew? i'm positive my '01 s-crew never did this. i would like some feedback before i take it to the dealership. thanks,

troy

 

TroyK,

Very similar situation on my Screw. It's faint and doesn't do it all the time but, I think mine does exactly what you're talking about...

I'm interested in anything that anyone can offer on this subject... I've been wondering about this...

 

Mine does the same thing, and has for the past year. I took it to the dealer twice and couldn't get it to duplicate. Something is not right though. Mine seems to be getting a little worse. I may make another trip to the dealer and let them keep it overnight. Maybe that way when it's cold they'll find the problem

 

thanks for the feedback...mine has been pretty good the past couple days. i does seem to be directly related to how cold it is outside, and how far you've driven. the thunking is most noticeable on the first few stops after having sat overnight...

 

I haven't been able to make a relation between the 'thunk' and temperature. Interesting observation however.

I did have a similar problem on my 1998 Explorer XLT however. After it would heat up, you could hear a strange 'thunk' every now and then when you were slowing down. Dealership seemed to think it was the steering colum but, after replacement of the suspect part, it was deemed that was not the problem.

I've since sold the Explorer (in an effort to help promotion of the payment to Ford Credit on a certain F150 KR SuperCrew) and thus, I'm not exactly sure what it was. I had a suspecion that it was something related to the drive shaft that went to the rear differential but, I could never prove it. *shrugs*

Any chance it could be something to do with the Limited Slip?

Had any luck with this post on any other threads? I'm still curious.

 

rockpick,

well, my '01 s-crew had limited slip also, and never thunked...so i'm shrugging my shoulders too. i'm not gonna take it in until it starts doing it all the time, otherwise i'm sure i'll get the "we can't make your truck do that" line from the service department.

btw, does anyone know if there is some sort of "sleeve" in the driveline somewhere. i remember my dad had a gmc truck that did something similar until they lubed what they called a sleeve. i really don't know what that would be unless it had a two piece driveshaft. does the s-crew have a two piece driveshaft?? just throwin' out some ideas...

 

Troy,

Ever find anything out on this issue? I'm still interested.

 

no, i prolly won't know anything until i go in for the next oil change. the "thunk" is only occasional and i'm not too worried about it. however, when it does happen, it is annoying...

 

My next oil change is up in about 800 miles I believe. I have to rotate and stuff thus, I'll probably just run it by the dealership. I'll ask the question as well. Wonder how much they'll wanna charge me to 'look at it'. I hate the dealership... too many bad pocketbook memories with that place.

 

rockpick,

your truck is still under warranty, isn't it. but i hear ya, i don't like going to the dealership either...even it it won't cost me a dime!!

 

Yeah, it's still under warranty (only 8500 miles on her) but, I still hate, like you said, to go to the dealership. I'd rather get kicked in the ... well.. never mind.

 

rockpick,

i had today off so i thought i'd investigate that "thunk" a little more and try to figure out what it is. i think i now know.

if i coast up to a stop in neutral, it doesn't happen. if i put the truck in low gear a few feet before i stop, i don't get the "thunk". i tried these two scenarios quite a few times, and didn't once get the "thunking" sensation.

therefore, it seems to me that the tranny is downshifting into first gear right about the time we stop, and putting a lurchiness into the stopping process. make sense??

try these tests on your truck and report back...

 

 

and i thought i had a sick sense of humor??

 

AHH SH*T! I never realized Cousin Ralph might have been rolling around in the bed of the truck! DAMN! I'm either going to have to tie him back down or I'm going to roll him off in the Ohio River later on today... I'll let you know if that has any effect on the problem.