Driveline Stuck in Transmission

[littleratsunlife82]

I have a 1982 datsun 720 regular cab, and i am having the hardest trouble removing my drive-line. I removed the bolts from the differential and got that disconnected and i was trying to pull the drive-line out but it wont come out like it should so i am wondering if i could have some help diagnosing the issue. i was reading some of the other forums and the only possible issue that i could think of is the output shaft has a nylon rubber or something on it so it expanded and wont budge, i am trying to remove it so i can replace the output shaft seal because i have a bad leak. ANY HELP WILL BE GREAT, i have tried getting it out 5 times and still no solution.. so i am just waiting till i get some new ideas to try it again.

[datzenmike]

Do you have a two piece driveshaft?

[metalmonkey47]

I'm willing to bet you haven't disconnected the carrier bearing yet...

[littleratsunlife82]

I only have a one piece driveline

[datzenmike]

Maybe the spline is a bit rusty. Tap the U joint forward into the transmission. Once loosened it should slide back and out.

[littleratsunlife82]

I have already tried that and that didnt work either

[datzenmike]

Yes, short wheelbase trucks had the single driveshaft.  It should slide in and out of the transmission as the rear axle moves up and down.

 

Has the truck been lowered?

Has it been in an accident?

[littleratsunlife82]

it has been lowered i flipped the leaf springs

[datzenmike]

Longest leaf at the top and shortest at the bottom I hope.

 

Can't see anything that would jam it in there but rust maybe. Can you post a picture? Maybe something obvious?

 

http://community.ratsun.net/topic/54932-photobucket-ratsun/

[littleratsunlife82]

yeah it is the longest one and the shortest one and no i dont have anything to take a picture of it with

[Stoffregen Motorsports]

On most other vehicles, when you make changes to the ride height, the driveline length is affected. If you lowered the truck and put in the stock driveline, it may be too long and it may have bottomed out in the trans and got stuck. I don't believe the slip yoke has splines all the way through, so maybe the tailshaft of the trans got jammed into an area of no splines and it's simply stuck.

 

If you do get it apart, inspect it closely to see if anything got damaged. Bearings inside the trans can get damaged from too much thrust and u-joints don't like it either.

[datzenmike]

I checked and the trans mainshaft spline ends and the remainder forward is smaller diameter. This only leaves the driveshaft mating spline. I checked this against a spare FS5W71B and yes it obviously will bottom. Only the forces generated by a vehicle would be enough to jam it.

 

How did you get the differential end off if solidly connected? When unbolted, did the differential suddenly release and shift to the rear?

 

Well there is only one way for this to come off. The front is too crowded to work on so try the differential end. Some form of slide hammer? Stick something through the rear U joint and strike with a sledge hammer?

[Stoffregen Motorsports]

My mind automatically goes through all the scenarios when facing a problem like this. Best case, it comes out with a few blows from a 3# sledge hammer. Worst case... slip yoke welded itself to the tailshaft and the only way to get it apart is to use a cutoff wheel to score it and then split it with a chisel.

 

I like the idea of a slide hammer. You can make one with a length of cable or any piece of steel and use a large sledge hammer head for the sliding hammer. Attaching it to the driveshaft may get tricky though. There may be some sacrifices made, like welding the slide hammer to the slip yoke, etc.

[datzenmike]

Tugging by hand and hammer taps won't do it but a good well directed blow might.

[littleratsunlife82]

thanks for all the help and it was not to difficult to disconect the end of the driveline from the diff it is a tight squeez to get it on and off so it might just be jammed into the transmission really tight and what would be your guys plan on pulling it out?

[Lockleaf]

Ideas for removing it from the trans

 

 

My mind automatically goes through all the scenarios when facing a problem like this. Best case, it comes out with a few blows from a 3# sledge hammer. Worst case... slip yoke welded itself to the tailshaft and the only way to get it apart is to use a cutoff wheel to score it and then split it with a chisel.

 

I like the idea of a slide hammer. You can make one with a length of cable or any piece of steel and use a large sledge hammer head for the sliding hammer. Attaching it to the driveshaft may get tricky though. There may be some sacrifices made, like welding the slide hammer to the slip yoke, etc.