Tailshaft removal

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Feb 28, 2012 | 11:56 AM

lavatan

Thread Starter

Laughing Gas

Joined: Oct 2010

Posts: 997

Likes: 2

From: Rock Valley, IA

Tailshaft removal

Hello all,

I've done some searching on the forum and the almighty googler and haven't really found any definitive information on removing the tailshaft from my T-19 transmission. The closest thing I could find is this thread: https://www.ford-trucks.com/forums/2...eedometer.html

That deals with the speedo in a transfer case (which is what this whole tailshaft removal process is about). I don't have a transfer case as I have only a 2 wheel drive truck.

Now, my question is this: I think it should be fairly straightforward to remove the tailshaft. Take off the nut and pop it out but I would like someone with experience to give me some advice for the seal and other nuances that I might run into in this little endeavor.

My goal is to find the correct drive gear/driven gear combination that will make my speedo finally read correctly. Thanks to all of you in advance.

Feb 28, 2012 | 01:00 PM

ctubutis

Moderator

Joined: Nov 2007

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From: Denver Metro Area, CO

Tailshaft, same as the output shaft?

if so, it looks like you have to disassemble the entire transmission:

http://www.flickr.com/photos/ctubutis/6792812764/http://www.flickr.com/photos/ctubutis/6792812764/ by http://www.flickr.com/people/ctubutis/, on Flickr

Feb 28, 2012 | 01:07 PM

Rogue_Wulff

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Joined: Dec 2007

Posts: 8,521

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From: Lost

I believe the tailshaft housing can be unbolted and removed rather easy. If that's what you are asking.
The tailshaft itself requires trans disassembly to remove.

Feb 28, 2012 | 01:14 PM

lavatan

Thread Starter

Laughing Gas

Joined: Oct 2010

Posts: 997

Likes: 2

From: Rock Valley, IA

RW, if removing the housing will allow me to get to the drive gear for the speedo, then yes, that is exactly what I am referring to.

Ctubutis, can you tell me if the part number that I'm lookin for is 7017?

Feb 28, 2012 | 01:44 PM

85lebaront2

Old School Hot Rodder

Joined: Feb 2006

Posts: 6,472

Likes: 11

From: Exmore, VA

Lavatan, 7017 looks like the brass synchro ring for 3rd or 4th gear. If you are looking for the speedometer drive gear it looks like it is 7072 or 17285. The picture is a front 3/4 view. Chris, it may be listed under the speedometer section. It would be called a speedometer drive gear. To my knowledge Ford only used a very few drive gears as a one tooth change made a big change in driven gear speed.

Depending on how far off it is, you can calculate the needed driven gear from your present gear.

Feb 28, 2012 | 01:51 PM

lavatan

Thread Starter

Laughing Gas

Joined: Oct 2010

Posts: 997

Likes: 2

From: Rock Valley, IA

Currently it is off by about 36%. It's reading 35 when I'm going 55. I have an 18 tooth gear in but it seemed to me that when I had the 16 tooth gear in it didn't change that ratio at all which is why I want to get to the drive gear to see what exactly I'm dealing with. I think the drive gear may be chewed up. The original driven gear that was in there was pretty chewed up when I replaced it. I was a newb (who am I kidding I still am) and didn't think that the drive gear was another plastic gear. The way the driven gear looked it appeared to be chewed up by something metal...

Feb 28, 2012 | 02:06 PM

85lebaront2

Old School Hot Rodder

Joined: Feb 2006

Posts: 6,472

Likes: 11

From: Exmore, VA

Lavatan, Ford makes right and left hand driven gears, if someone had the wrong rotation gear it will chew up in a hurry. Does you truck have a slip yoke at the transmission or is it a bolted on flange for the U-joint? The difference is how you get it off. Once the U-joint stuff is out of the way, all you should need to do is remove the bolts on the rear housing. I would get a gasket and seal, maybe two gaskets if you need to use the truck while waiting for a gear.

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Mar 9, 2012 | 07:30 PM

lavatan

Thread Starter

Laughing Gas

Joined: Oct 2010

Posts: 997

Likes: 2

From: Rock Valley, IA

Here are a couple of pictures of the tailshaft or output shaft of the transmission. I think if I take that nut off and take the housing bolts off it should slide right out and expose the gear. What do you think?

Mar 9, 2012 | 08:02 PM

#10

85lebaront2

Old School Hot Rodder

Joined: Feb 2006

Posts: 6,472

Likes: 11

From: Exmore, VA

Jeremy, you are correct, put the transmission in either first or reverse so you can get the nut off easily, then take it out of gear and remove the tailshaft housing, AKA extension housing. Be careful not to let the mainshaft slide back or you will have a real problem.

Mar 9, 2012 | 08:26 PM

#11

lavatan

Thread Starter

Laughing Gas

Joined: Oct 2010

Posts: 997

Likes: 2

From: Rock Valley, IA

Thanks, Bill, for confirming that. I can imagine the trouble I'd be in if I slipped that out. From what I gleaned from the diagram it would be a big ol' pile of worms.