what should the length of the tailstock shaft stick out past the flange with the seal. Mine sticks out 1.250" , is this right? Thanks

 

I take it you are talking about the yoke. I have read the optimal distance is 1 inch. I imagine there is a + and - distance to go with this. Some yokes are longer then others and don't bottom out into the transmission without having some still sticking out. The 1 inch is base upon the distance in which the yoke is pulled out after it has bottomed out.

 

I was looking at getting the driveshaft cut to size. I have a problem with the crossmember that was in the way. I started to cut away the piece that was in the way. I get the yoke of the drivshaft to enter the trans but was not sure how far it should be in or out. This is a complete airbag setup on the truck so in not sure how far it should slip in and out. I have it on my lift so i was going to play with it up and down and see what the lenght changes.

I looked up on the internet and saw some drawings with what looked like shorter lenght that stuck out past the end of the trans where the seal was. This is the reason for the question, Thanks!

 

I just had my driveshaft shortened and different yolk installed for the red truck, now that I have the lm7/700r4 instead of the 408/c4..

the measurement I gave them was from the bottom of the u-joint socket on the rear end to the face of the tranny seal. 57inches.

the new driveshaft is 56inches to the edge of the yoke flange, and 1 inch exposed yoke shaft to 57 inches..

Sam

 

Sam who did you get to resize the drive shaft? I am guessing it will be up near you and no where down south by me. :-)

 

I read on here somewhere many many months ago that you push the yoke in till it bottoms out then pull it out 1 inch. Thats how I did mine and set the length for the new driveshaft. And if I remember correctly my drive shaft was 56 inches. Thats with a C6 and an 8.8 explorer rearend.

 

Check with the shop you are going use as some want different measurments. That being said most I have worked with can use the distance between the end of the tailshaft and the back of the joint cup on the pinion yoke and by the way that should be measured at normal ride height, so unless you need the shaft right away I would wait until you know where ride height is with it assembled.

 

I pushed it in and pulled it back out an inch and bolted the u-joint that i cut off on the rear, marked and cut the driveshaft down. Took about 2" off and pushed it back in the pipe and turned it over and over with an indicator on it till it was as good as it would (had to tap it to get it in) tack welded it and removed and burned it in. Will have to wait and see if it vibrates, if so i have it ballanced.There is a few pics in my photobucket link take a peak if you wish.

 

Roger,
Looked at the photos, it's looking good and you do a nice job at burning steel. You make me jealous because my lift is outside and it was 2 degrees here this morning. I to have shortened my own driveshaft for my '69 mustang convertible with out any issues, I just assumed you were going to send it out. Good job.