Can't get my driveshaft back into the transmission

boostcraver

Member
Mar 13, 2010
372
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16
Louisville, KY
Like the title says, I can't get my driveshaft pushed into the rear of my transmission. I have consulted the tsrm., and in any case that the driveshaft is referenced, the manual simply says remove or install, and no further instructions are given. My searches on here also failed to turn up much of anything valuable for my problem. I have dropped the exhaust, so it is out of the way, and loosened and dropped the center carrier bearing. The bolts holding the two sections of the shaft together are frozen or extremely torqued, and I cannot break them loose. (I hit them with a heavy dose of rust penetrant.) I have lubed the splines on both the output shaft of the transmission and the yoke of the shaft, as well as the outside surface of the spline housing. I tried jacking under the center bearing after pushing the shaft into position on the splines. The thought was that as I raised the center of the shaft, the splines would push into the transmission as the shaft tried to straighten itself. It did not work. I can get about a half inch of engagement on the splines when I push the shaft up to the transmission, and it appears to be pushing on straight and not binding for that reason. But it is still binding somewhere. Has anyone else run into this before? Is there something that I am missing? The car is a '91 7M turbo-powered automatic with stock trans. and driveshaft. Thanks in advance! Can post pics if necessary. Also, the trans. IS mouted on the crossmember.
 

Another MkIII

Member
Feb 22, 2009
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Chicago
Wait, you tried to use the jack to push the splines together? Or am I reading that wrong? It sounds like the splines might me chewed up for some reason, it should slide right in.
-AM3
 

boostcraver

Member
Mar 13, 2010
372
0
16
Louisville, KY
Yes, AM3, you read that right. I tried to use the jack. I was trying to jack the shaft into straightening out and pushing the splines into the trans. I'm no master mechanic, but it seemed like a good idea until it didn't work. No, I did not drop it, and other than some rust, I can't see any other imperfections on the shaft or splines. If anyone could give me the process for getting pics on here, I will post some pics of the parts in question. I have them on my hard drive in the computer, but the insert image icon only gives me one option to enter an url for the pics. Thanks.
 

boostcraver

Member
Mar 13, 2010
372
0
16
Louisville, KY
I don't know if it will help or not, but I did get some pics of the parts on here in an album. It's under the name "reconstructing the legend." Hope that helps you get an idea of what I am seeing here. It's the best i could do tonight.
 

hvyman

Dang Dude! No Way Man.
Staff member
Apr 17, 2007
12,568
1
38
Fullerton,CA
Bolt DS to the rear end, Slide the other end into the tranny, Bolt up the carrier bearing.

Some times you have to turn the DS to get it in the tranny.

Its not that hard.

Check the output shaft and the drive shaft for any damages on the splines.
 

Gargoyle

New Member
Mar 13, 2006
159
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Portland, Oregon
From what it looks like to me, and correct me if I'm wrong, it appears that you are getting stopped by the output seal on the trans. I'm not sure what the fix is but I would recomend cleaning out the spline on your driveshaft and wiping down the outside of the shaft also. It looks like there is quite a bit of extras on/in both. It could be the pictures are just making it look that way but a nylon toothbrush on the inside of the splines and a cleaning solvent could help you out. I haven't read the TRSM so I don't know if it will hurt or not, but maybe a lubricant on the outside shaft of the driveline where it will make contact with that seal.

Just my two cents.

Brian
 
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boostcraver

Member
Mar 13, 2010
372
0
16
Louisville, KY
Gargoyle;1534577 said:
From what it looks like to me, and correct me if I'm wrong, it appears that you are getting stopped by the output seal on the trans. I'm not sure what the fix is but I would recomend cleaning out the spline on your driveshaft and wiping down the outside of the shaft also. It looks like there is quite a bit of extras on/in both. It could be the pictures are just making it look that way but a nylon toothbrush on the inside of the splines and a cleaning solvent could help you out. I haven't read the TRSM so I don't know if it will hurt or not, but maybe a lubricant on the outside shaft of the driveline where it will make contact with that seal.

Just my two cents.

Brian

After you said that Brian, I looked at my own pics again and I think I agree with you about the seal. Not sure if it comes in different sizes, might just have the wrong one. Would be relieved for sure if that's all it is! Most of the junk you are seeing is the high-temp grease that I applied to both the inner and outer surfaces of the shaft. My Brother looked at it and said I should try to clean up the outside of the shaft with some emory cloth to get rid of the rust. Also gonna hit it with some parts cleaner. I have to work this weekend so I prob. won't be able to work on it again 'til tues. will keep everyone updated as to how it turns out. Thanks to all for the suggestions!
 

dumbo

Supramania Contributor
Jul 16, 2008
1,911
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Albera, Too Far North
This may be a dumb question but the rear wheels are off the ground so you can spin the DS right? Pictures don't really don't help a whole lot because it only takes one spline to have a nick or burr and she wont go. I would clean up those rusty splines my self.
 

boostcraver

Member
Mar 13, 2010
372
0
16
Louisville, KY
dumbo;1534829 said:
This may be a dumb question but the rear wheels are off the ground so you can spin the DS right? Pictures don't really don't help a whole lot because it only takes one spline to have a nick or burr and she wont go. I would clean up those rusty splines my self.

Yes, the rear of the car is off the ground. Was working on the car in semi-darkness by the time I got to the driveshaft install, so the rust and dirtiness of the splines was not as visibly evident at that time. I have since cleaned everything up, and am just waiting to have the time to fiddle with it after work this weekend.
 

boostcraver

Member
Mar 13, 2010
372
0
16
Louisville, KY
Just wanted to say thanks to all who replied to this question and report on my success. I polished the outer surface of the yoke with the emory cloth and thoroughly cleaned the splines with carb cleaner. I then lubed the trans. seal with trans. fluid and also the surface of yoke. Pushed in like it was nothing.
 

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Another MkIII

Member
Feb 22, 2009
697
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16
Chicago
Good to hear, I was kinda worried that you messed up the splines when you tried pushing it in with the jack (not trying to bash on you, I've screwed up dumber things, lol), so I'm glad to hear it went well.
-AM3