4 speed swap leak

B

Beef97

Member

Dec 24, 2004

46

0

7

Corpus Christi, Texas

Dec 4, 2005

#1

• Dec 4, 2005

• #1

Hey guys, a few years back i had a 4 speed toploader put in place of my 3 speed. The transmission is awesome, however i think that the tail of the 3 speed was a bit longer than the 4 and the yoke doesn't quite go as far in as it could. I'm guessing this is where my oil leak is coming from? Is there a rear seal on the tranny that might fix this? What about a different yoke? How many splines does it have? Do they make one a bit longer or is getting a completely new driveshaft the only option? I don't have any information on the 4 speed, someone found it at a salvage yard. Thanks for any input!

 

rbohm

Founding Member

Apr 12, 2002

6,698

550

204

tucson,az

Dec 4, 2005

#2

• Dec 4, 2005

• #2

there are a few different tailshaft lengths for the top loader transmissions, 3 and 4spd. check the seal and the yoke for damage.

 

Dark Knight

Founding Member

Feb 1, 2000

2,578

0

0

Chandler, Az.

Dec 5, 2005

#3

• Dec 5, 2005

• #3

If you can get underneath, try and look at the casting numbers..
http://www.davidkeetoploaders.com/idchart1.htm

I'd unbolt the driveshaft from the rear and see how much foward travel you have before it bottoms out. Check the input shaft for nicks, they'll chew up the rear seal quick.

 

1

1966conv

New Member

Mar 5, 2004

220

0

0

Dec 5, 2005

#4

• Dec 5, 2005

• #4

I agree with Dark Knights assessment. Unbolt from the rear and slide in, you should have between 1/2 to 1 inch of slide in room. If you have more than 1 inch IIRC that's too much. If you're ok there, you're loosing the seal.

 

dennis112

15 Year Member

May 15, 2005

1,561

36

79

Amish Wonderland of Central PA.

Dec 5, 2005

#5

• Dec 5, 2005

• #5

All you probably need is a fresh rear seal. Get one and then do the depth check when you go to replace it.

While you are checking for depth, also try to wiggle the shaft up and down and left to right to determine if the tailshaft bushing is bad. Excess slop will lead to leaks. The tailshaft housing would have to be dropped if this is the case.

 

B

Beef97

Member

Dec 24, 2004

46

0

7

Corpus Christi, Texas

Dec 5, 2005

#6

• Dec 5, 2005

• #6

yeah good ideas. I just ordered a new yoke and a couple of spicer u joints. How hard is it to change that rear seal on the tranny? I'm guessing the local auto parts store carry these? Thanks again!

 

HistoricMustang

Active Member

Apr 11, 2003

2,359

0

46

Confederate States of America

Dec 5, 2005

#7

• Dec 5, 2005

• #7

dennis112 said:

All you probably need is a fresh rear seal. Get one and then do the depth check when you go to replace it.

While you are checking for depth, also try to wiggle the shaft up and down and left to right to determine if the tailshaft bushing is bad. Excess slop will lead to leaks. The tailshaft housing would have to be dropped if this is the case.

Click to expand...

Same here for what it is worth.

HistoricMustang
www.historicmustang.com