I have always had a small vibration somewhere in my drivetrain for as long as I have had this car (21 years). I recently removed the Muncie and installed a Tremec 5-speed. I have just recently drove the thing on the highway and anything over 70MPH will produce a tremendous teeth rattling, floor pounding, mirror blurring vibration. I was checking driveline angles with my inclinometer this past weekend. This is what I had:
Trans pointing down 3.5 degrees
Driveshaft pointing down 1.25 degrees (trans to driveshaft angle = 3.5 - 1.25 = 2.25 degrees)
Pinion pointing down 2.2 degrees (driveshaft to pinion angle = 2.2 + 1.25 = 3.45 degrees)
Driving the car with these setting was unbearable and I was waiting for something to let loose.
I raised the tail of the trans about 1" and measured again. I now have
Trans pointing down 2.7 degrees
Driveshaft pointing down 2 degrees (trans to driveshaft angle = 2.7 - 2.0 = 0.7 degrees)
Pinion still at 2.2 down (driveshaft to pinion = 2.2 + 2.0 = 4.2 degrees)
Raising the tailshaft did 2 things, lessened the angle at the trans by about 1.5 degree and increased the angle at the pinion by almost 1 degree.
So which change made it better????
The severe vibration is gone for the most part, but there is still something wrong there that vibrates the rearview mirror to the point where all cars are a blurred-double vision. I have read so many conflicting posts on driveline angle. I would like to hear some measurements from those who have installed a Tremec and know their 3 angles.
Trans pointing down 3.5 degrees
Driveshaft pointing down 1.25 degrees (trans to driveshaft angle = 3.5 - 1.25 = 2.25 degrees)
Pinion pointing down 2.2 degrees (driveshaft to pinion angle = 2.2 + 1.25 = 3.45 degrees)
Driving the car with these setting was unbearable and I was waiting for something to let loose.
I raised the tail of the trans about 1" and measured again. I now have
Trans pointing down 2.7 degrees
Driveshaft pointing down 2 degrees (trans to driveshaft angle = 2.7 - 2.0 = 0.7 degrees)
Pinion still at 2.2 down (driveshaft to pinion = 2.2 + 2.0 = 4.2 degrees)
Raising the tailshaft did 2 things, lessened the angle at the trans by about 1.5 degree and increased the angle at the pinion by almost 1 degree.
So which change made it better????
The severe vibration is gone for the most part, but there is still something wrong there that vibrates the rearview mirror to the point where all cars are a blurred-double vision. I have read so many conflicting posts on driveline angle. I would like to hear some measurements from those who have installed a Tremec and know their 3 angles.
