9 inch rear driveshaft length
#1
9 inch rear driveshaft length
Over the past year we started making the length of the PST driveshafts we sell for the Moser 9 inch one inch longer than the ones we sell for the 10 bolt and 12 bolt rears. In doing this the splines will be engaged into the transmission the same distance as they are from the factory. Generally it does not cause a problem if the driveshaft length is too short by this difference, the one in my own Camaro needs to be longer as well, and we're running 1.29 60 ft times with it and the spline are in perfect condition. I will be getting a longer driveshaft for mine, we used the same PST driveshaft between the turbo 400 I was using and the Powerglide I have now.
I had a customer call last week who I have sold a Moser 9 inch to last year and a PST driveshaft. He has had a driveline vibration that he could not get rid of, and while I did not think that a longer driveshaft would take care of the vibration, I sent him one. He received the new driveshaft and installed it, and guess what, it took care of the vibration!
PST has always used the 44.25 dimension for the 12 bolt and 9 inch driveshafts, but I have been spec'ing out the 9 inch driveshafts at 45.25. If you have a nine inch with a driveline vibration, a longer driveshaft may be the cure to your problem. Bob
I had a customer call last week who I have sold a Moser 9 inch to last year and a PST driveshaft. He has had a driveline vibration that he could not get rid of, and while I did not think that a longer driveshaft would take care of the vibration, I sent him one. He received the new driveshaft and installed it, and guess what, it took care of the vibration!
PST has always used the 44.25 dimension for the 12 bolt and 9 inch driveshafts, but I have been spec'ing out the 9 inch driveshafts at 45.25. If you have a nine inch with a driveline vibration, a longer driveshaft may be the cure to your problem. Bob
#3
Yes, a lot of these cars typically have the rear sitting .5 too far back in the wheelwell. This is not normally noticed until 28 tall tires are mounted on the car. By moving the rear forward with adjustable lower control arms, some of the extra driveshaft length that may be needed is made up. Bob
#4
TECH Resident
iTrader: (12)
Join Date: Sep 2004
Location: Newhall, CA
Posts: 782
Likes: 0
Received 0 Likes
on
0 Posts
Yes, a lot of these cars typically have the rear sitting .5 too far back in the wheelwell. This is not normally noticed until 28 tall tires are mounted on the car. By moving the rear forward with adjustable lower control arms, some of the extra driveshaft length that may be needed is made up. Bob
#5
12 Second Club
iTrader: (26)
Join Date: Apr 2005
Location: Brockport NY
Posts: 1,456
Likes: 0
Received 0 Likes
on
0 Posts
When was this vibration occurring, under what conditions? I have a buddy that has a A4 camaro that has a nasty vibration at 80mph when he lets of the gas, and this is after getting the shaft balanced. I measured from center U-Joint to center U-joint and it is exactly 41" Long. Another thing that is funny is the car has a steel drive shaft witch is odd for a 2002 that was bought with only 14k miles.
#6
On The Tree
iTrader: (16)
Join Date: Nov 2006
Location: Jax Beach, FL
Posts: 105
Likes: 0
Received 0 Likes
on
0 Posts
yea I just finished up my 9 inch.. I got the factory driveshaft with a conversion u-joint.. But I noticed that my drive shaft needs to be alittle longer.. It looks like it is about to fall out of the trans...
Bob Ill send you a pm to see how much one would be..
Evan
Bob Ill send you a pm to see how much one would be..
Evan
#7
When was this vibration occurring, under what conditions? I have a buddy that has a A4 camaro that has a nasty vibration at 80mph when he lets of the gas, and this is after getting the shaft balanced. I measured from center U-Joint to center U-joint and it is exactly 41" Long. Another thing that is funny is the car has a steel drive shaft witch is odd for a 2002 that was bought with only 14k miles.
Take a look at the diagram above. For the nine inch we figure 45.25 for the X dimension. Bob
Trending Topics
#8
yea I just finished up my 9 inch.. I got the factory driveshaft with a conversion u-joint.. But I noticed that my drive shaft needs to be alittle longer.. It looks like it is about to fall out of the trans...
Bob Ill send you a pm to see how much one would be..
Evan
Bob Ill send you a pm to see how much one would be..
Evan
Thanks. Bob
#20
http://www.moserengineering.com/Page...torquearm.html
That is my car in the video on the right side of this link.
Same price for the shorter length. Thanks! Bob