B Trans Input Shaft Question
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=139470
Printed Date: 28 May 2025 at 10:39pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: B Trans Input Shaft Question
Posted By: CrestonM
Subject: B Trans Input Shaft Question
Date Posted: 16 Jun 2017 at 8:25am
| How hard is the transmission input shaft to change on a B? I don't need to do it, but I've heard of people stripping the splines off. |
Replies:
Posted By: Dick L
Date Posted: 16 Jun 2017 at 4:00pm
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It all depends on what you have to work with. If you have a good engine lift and proper blocking or jack stands it is not real hard. You need to remove the bolts from the foot rests to the fender rails as well as the four bolts thru the torque tube into the transmission case. It would be best to have the gas tank empty or removed to keep the weight balance for the engine lift. You need to have the new/different good drive shaft into the clutch/flywheel first and then replace the cotter key thru a narrow opening just before replacing the four bolts. I tool my pictures to show what I was doing. Not as step by step on how to. You end up looking like the picture.   
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Posted By: CrestonM
Date Posted: 16 Jun 2017 at 4:09pm
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Thanks, Dick. I understand splitting the tractor and all that, but I meant actually replacing the shaft once you get it all apart. In your photos it looks like there are 3 or 4 bolts around the shaft. Do you just remove those and the shaft slides out? Thanks
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Posted By: Dick L
Date Posted: 16 Jun 2017 at 5:29pm
| After you split the torque tube from the transmission nothing holds the shaft in as long as the cotter key is out. If the splines have been stripped you would not have a cotter key holding it. The shaft can not slide out forward when split at the engine unless the throw out bearing assembly is removed. Chances are on a B you would have a larger U joint which would not come forward even with the assembly removed. |
Posted By: CrestonM
Date Posted: 16 Jun 2017 at 6:49pm
| So...you're saying it's usually the torque tube shaft that strips out, and not the stub shaft sticking out of the transmission? |
Posted By: Dick L
Date Posted: 16 Jun 2017 at 8:49pm
Correct! I did have some damage to my stub shaft. I decided to use a grade 5/16" bolt rather than weld it up and recut it even though it was not all that bad. You can see some of the damage in this picture.   
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CrestonM wrote: