thunk when accelerating from stop
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thunk when accelerating from stop
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.
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.
Last edited by XCalvinX; Jun 6, 2006 at 09:16 PM.