Working on refining my van:
I have been doing a bunch of diognosis on the bad vibs in my Van
#1 the drive shaft is too long (maybe).
#2 the rear end pinion angle changes too much, (spring wrap)Looks to be moving about 7* or so.The pinion picks up so much it pushes the drive shaft right into the trans and then pushes the trans forward when I apply enought torque.
#3 I also notice, with normal driving I get a vibration building up as the engine RPM increases and then it goes away right when the trans changes gear, same for all gear shifts and any road speed .
Have a look at it here.
#2 will need a set of trackion bars like panelmanrd recomends However I am going to use Track rods which when used on leaf spring suspention act like the 3rd and 4rth links of a four link setup.
This is what they look like.I will build a simular set up.
This might also fix problem #1 I will show vidio when I get it done in about 2 monthstime.
I will get all I need for that from this family busines.
Problem #3 I have encountered before, this is either crankshaft, flywheel, torque converter and/or trans input shaft imballance. Usually a Going bad torque converter although it can simply be the fact that the flex plate or torque converter has thrown a ballance wieght. First clue is, This is actually a replaced or posibly overhauled trans from some nickle and dime trans shop. I like to refer to it as a rattle can overhaul.often one can try just repositioning the torque on the flexplace by rotating it to the other bolt holes.
A simple test is in park or nutral I get the vib coming on around 2200 to 2500 RPM same as on the road.
We will see how that turns out.
Last edited by m1dadio on Fri Dec 30, 2011 11:11 am; edited 1 time in total