EXACT MESUREMENTS FOR DRIVESHAFT FOR FORD 9"
- Thread starter LIVE4RDO
- Start date
boostjunkie
NEED MORE BOOST
- Joined
- May 27, 2001
What trans ?
boostjunkie
NEED MORE BOOST
- Joined
- May 27, 2001
I have the info for a 400 with a 9 inch
- Joined
- May 28, 2001
FWIW: When I set up my T400/9", the stock driveshaft fit perfectly, w/ a 1350 rear joint and a MW yoke. This was w/ stock length control arms.
Replaced it w/ a DST alum, for serious power app.
NY Twin Turbo
All the good stuff.....Times 2.
- Joined
- Dec 10, 2014
I hate to tell you this because I know you want a jump on things. But I would wait until the rear is in and measure it up then.
When I swapped to a TH400, I used a balanced driveshaft from an 8 second Buick with the exact same set-up. The shaft was 3/4" short of the acceptable range. I didn't know why I had such a bad vibration while cruising. I jacked it up, put it in gear, watched it spin, and could see the wobble on the trans output shaft. Had to have one made. I think I went with 1-1/8" longer.
When I swapped to a TH400, I used a balanced driveshaft from an 8 second Buick with the exact same set-up. The shaft was 3/4" short of the acceptable range. I didn't know why I had such a bad vibration while cruising. I jacked it up, put it in gear, watched it spin, and could see the wobble on the trans output shaft. Had to have one made. I think I went with 1-1/8" longer.
I run a 9 inch and a 200.do yourself the biggest favor you can and measure it order to your cars exact specs.i used pst and went with a 3.5 very reasonable.
Sounds like a good advice. Thanks
- Joined
- Nov 30, 2009
This is what Dennys Driveshaft has you measure for fitment on a non stock driveshaft application .
http://www.dennysdriveshaft.com/app/webroot/img/File/how_to_measure_diagrams/b.html
Mine fit perfect .
http://www.dennysdriveshaft.com/app/webroot/img/File/how_to_measure_diagrams/b.html
Mine fit perfect .
Last edited:
NY Twin Turbo
All the good stuff.....Times 2.
- Joined
- Dec 10, 2014
In my case, I had the wrong driveshaft and trans yolk in hand.
Measuring was super easy.
-With the full weight of the car on its suspension.
-I just inserted a 3/4 inch spacer (stacked washers) into the yolk.
-Slipped it over the output shaft of the trans until it stopped hard.
-Then measured center to center of the u-joints.
Done. No fancy calculations or information required.
I brought that measurement to a local Heavy Equipment and Big-Rig driveshaft shop called Excelsior Machine here in NY. Asked him to build it to my number and high speed balance it. A day later it was ready. I noticed it didn't have any weights tacked to it. I asked him why? He said "You got lucky. About one in ten are good right off the bench and you don't need it". I was very cautious and doubled up on my questions. And he repeatedly assured me it was "dead-on perfect".
He was right. It's been to 146 mph with much more in it, and it's smooth as glass.
Measuring was super easy.
-With the full weight of the car on its suspension.
-I just inserted a 3/4 inch spacer (stacked washers) into the yolk.
-Slipped it over the output shaft of the trans until it stopped hard.
-Then measured center to center of the u-joints.
Done. No fancy calculations or information required.
I brought that measurement to a local Heavy Equipment and Big-Rig driveshaft shop called Excelsior Machine here in NY. Asked him to build it to my number and high speed balance it. A day later it was ready. I noticed it didn't have any weights tacked to it. I asked him why? He said "You got lucky. About one in ten are good right off the bench and you don't need it". I was very cautious and doubled up on my questions. And he repeatedly assured me it was "dead-on perfect".
He was right. It's been to 146 mph with much more in it, and it's smooth as glass.
Last edited:
T- Type Tim
Vice Chairman
- Joined
- Jul 8, 2001
I had to lengthen mine exactly .75"
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