on my Duster, 8.75 rearend, spring suspension. messed some with this last year and lost interest because I really didn't understand pitch. now it is time to get it done. I had a slight vibration, not enough to spend a lot of money trying to find where it was. This year going to car show I have been carrying a lot more stuff in the trunk, like canopy, chairs, coolers etc. etc. now that the tranny mount problem is fixed the vibration is worse. Yesterday coming home from the show I noticed something I never had before. I am probably carrying about 400 pounds in the trunk. give or take. I was trying out the car yesterday and going down the road I hit a small dip in the road and the car went up and then squatted down a little and then leveled off. you know what I mean. When the car came down, at that point I noticed the vibration got worse at that point. when it leveled off it was back at a slight vibration. I know now that it was a change in the pitch of the rearend driveshaft tranny that caused it. Here are my questions:
1. should 400 pounds change the pitch that much. I don't remember being a kid and loading the trunks on cars like these to go on vacation causing a problem in cars.
2. Do you think that the springs may be a little weak causing it to squat more and would weak springs cause this at all.
3.at the point where the car came up and then back down in the dip, did the front of the rearend raise up that I felt the vibration a little more.
4. If that is the case, do I need to shim the back of the rearend and push the nose of the rearend down some. I know, I need to put the guage on it. I am going to do that shortly. I do not really understand this concept so I am trying to understand it in my terms about angles. I know they need to be one up and one down but it is confusing to me. I have several sets of shims but was wondering which way to start.
5.When cars shows are over and I take the 400 pounds back out, will I have to redo the pitch again.
6. last question......... would it do me any good to have a new set of springs made for this car. Or have these re-arched. would that keep the weight from changing the pitch enough to not cause a vibration.
someone explain this to me in terms I can understand. I don't understand some of the technical terms some of you guys use on these cars. I am old school. Not stupid but sometimes I read posts on here that some of the younger guys use that means the same thing we did back in the day to achieve the same results . Thanks,Bill :violent1:
1. should 400 pounds change the pitch that much. I don't remember being a kid and loading the trunks on cars like these to go on vacation causing a problem in cars.
2. Do you think that the springs may be a little weak causing it to squat more and would weak springs cause this at all.
3.at the point where the car came up and then back down in the dip, did the front of the rearend raise up that I felt the vibration a little more.
4. If that is the case, do I need to shim the back of the rearend and push the nose of the rearend down some. I know, I need to put the guage on it. I am going to do that shortly. I do not really understand this concept so I am trying to understand it in my terms about angles. I know they need to be one up and one down but it is confusing to me. I have several sets of shims but was wondering which way to start.
5.When cars shows are over and I take the 400 pounds back out, will I have to redo the pitch again.
6. last question......... would it do me any good to have a new set of springs made for this car. Or have these re-arched. would that keep the weight from changing the pitch enough to not cause a vibration.
someone explain this to me in terms I can understand. I don't understand some of the technical terms some of you guys use on these cars. I am old school. Not stupid but sometimes I read posts on here that some of the younger guys use that means the same thing we did back in the day to achieve the same results . Thanks,Bill :violent1:
