Hello Everyone,
I have been wrestling with this thud from accelerating from a dead stop for a while. 99 f150 4.6 4x4 supercab shortbox
I have heard it said that it is related to the yoke on the drive shaft. I think it bumps the transmission when you first start moving. And that by applying grease to the inside of the yoke it help to quiet it down.
Now i tried this and It worked for a short time, but the thud returned quickly.
I had given up on solving this until i recently added a set of extra leafs to my leaf springs. I also changed from Carquest to Edelbrock shocks, but i feel like this is unrelated to the problem.
I did notice that the thus is totally gone now, and wonder if this little bit of added mass in the leaf pack changed the drive line relation somehow allowing for a touch of extra room now so it doesn't hit anymore.
Can this be true or am i crazy? Either way i am happy the problem is gone but i would like to know what fixed it.
My other theory is that my 150k springs were weak and allowing the driveline to flex and possibly axel wrap?
On a second question, is it possible that my transmission with 150k on it can be slowing my truck down a good bit? I have almost all the easy mods done already, but it has no off the line power. I realize the 35"s don't help but the 4.56 should have made up for it. There is no way i caqn get any tire spin unless its raining.
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company
thunk when accelerating from stop
Linear Mode
