International Full Size Jeep Association
Home Forums Reader's Rigs Tech Library Trail Stories FSJ-List
International Full Size Jeep Association  

Go Back   International Full Size Jeep Association > Tire Kickin' > General FSJ Tech

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 09-22-2017, 03:03 PM
440sixpack 440sixpack is offline
Grease Monkey
 
Join Date: Jul 21, 2016
Location: oregon
Posts: 390
Dana 20 full of ATF

My 1978 J10 project is about 3/4 done and now I'm puking ATF out my transfer case on the floor.

I have a TH400 converted to accept the Dana 20 with factory parts. I assume there must be a seal that is either bad or missing between the adapter and the transfer case ? since my TSM doesn't cover this combination I don't have anything to go off of.
Reply With Quote
  #2  
Old 09-22-2017, 04:18 PM
rang-a-stang's Avatar
rang-a-stang rang-a-stang is offline
Master Mechanic
 
Join Date: Oct 31, 2016
Location: Camarillo, CA
Posts: 835
Can you verify the ATF level in your trans is going down? Does D20 take ATF or gear oil? I guess what I am getting at is: are you sure where that ATF is coming from?
__________________
2011 Nissan Pathfinder Silver Edition 4x4
2009 Mazdaspeed3 Grand Touring
1999 VW Cabrio (my daugther's to drive, mine to maintain)
1979 Jeep Cherokee Chief Wide Track, 401, bone stock
Reply With Quote
  #3  
Old 09-22-2017, 04:33 PM
KaiserMan's Avatar
KaiserMan KaiserMan is offline
I got the Willys....
 
Join Date: Jun 21, 2005
Location: Huntington, Ma.
Posts: 8,587
There are two seals in your transmission to transfer case adapter. One on each side of a large bearing. Sounds like both are bad.

Edit. Seals are both on one side of the bearing.
__________________
Thomas Russell
1971 Gladiator J2000 Platform-Stake Dump 350/T18
1970 Gladiator J3000 3407Z Camper Truck 350/T18
1968 Gladiator J3000 3406Z 160" wheel base DRW 350/T18
1963 Gladiator J300 Townside 350/TH400


Last edited by KaiserMan : 09-26-2017 at 07:32 PM.
Reply With Quote
  #4  
Old 09-22-2017, 06:10 PM
440sixpack 440sixpack is offline
Grease Monkey
 
Join Date: Jul 21, 2016
Location: oregon
Posts: 390
Yes, my transmission is low enough it won't hardly move.

I pulled the case and adapter and one of the seals is shot, the other looks okay. I'll replace both of course.

The next thing is I've seen talk on the web about an O ring on a chevy that must be in place or it will leak. on the input? I don't know where.

I would assume a chevy with a TH 400 and a Dana 20 would be basically the same set up. but I can't confirm any of this. I wish I had a TSM from the early 70's.
Reply With Quote
  #5  
Old 09-22-2017, 06:10 PM
mattmopar440's Avatar
mattmopar440 mattmopar440 is offline
FSJ Maniac
 
Join Date: May 17, 2007
Location: Algonquin (Chicago suburb) Illinois
Posts: 3,979
well if you didnt put ATF in it its comming from the TH400 the TH400 has no output seal so the input seal on the Dana 20 is bad
__________________
91' Grand Wagoneer
401/727/229, Currently:Down for Body Work
77' Wagoneer 401 Parts rig
80's J10 258/T-5/208
89' Jeep GrandWagoneer
New Project
74' J10 Go Grabber Green Running
Quote:
Originally Posted by Heavy_Metal_Thunder_81
Inferior Chevy


Reply With Quote
  #6  
Old 09-22-2017, 06:22 PM
440sixpack 440sixpack is offline
Grease Monkey
 
Join Date: Jul 21, 2016
Location: oregon
Posts: 390
There are 2 seals in the adapter to hold in the ATF, the Dana 20 is wide open. so those seals I understand.

I still don't know about the O ring or where it goes or if there is one. it looks as if ATF could work it's way between the gear splines on the TH 400 output into the Dana 20. somewhere here is where I think the O ring come into play.
Reply With Quote
  #7  
Old 09-22-2017, 10:37 PM
bufurd's Avatar
bufurd bufurd is offline
Grease Monkey
 
Join Date: Apr 13, 2008
Location: ashland wi.
Posts: 497
The o ring is on the output shaft in a groove to keep atf from going through the splines. I've "siliconed" up the splines when I put t case on in past and never had an issue
__________________
Current fleet
Abner-73 He started it all in 1979 (plow truck now)
Bufurd-69 Fixed up to take Abners place as DD
Delta-70 Built for fun, 455 Olds, T-18, D-20, 4:10 gears
Humpty-74 J-20 4BT, NV4500, 30+MPG
07 JK Wife bought new...
13 Grand Cherokee Trail Hawk, wifes new ride
Reply With Quote
  #8  
Old 09-23-2017, 08:00 AM
mokurt mokurt is offline
Grease Monkey
 
Join Date: Feb 23, 2014
Location: Hollister,Ca
Posts: 431
My old '67 was leaking the same.
I replaced the seals in the adaptor,replaced adjacent gaskets/orings and siliconed the splines.
__________________
1967 J2000
1985 CJ7
Reply With Quote
  #9  
Old 09-23-2017, 08:07 AM
440sixpack 440sixpack is offline
Grease Monkey
 
Join Date: Jul 21, 2016
Location: oregon
Posts: 390
There is a groove on the output shaft with no O ring on it. no doubt this is the problem. I'll put one on as well as silicone. since I have it apart I'll put new seals in the adapter.

hopefully this will help someone in the future, I searched hard and there seems to be very little helpful information on this issue .
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
If Jeep could make a full size pickup what direction would they take? kmass5050 General FSJ Discussion 22 03-14-2009 10:54 AM
Changing a Dana 44 bolt pattern Fox Off-Road FSJ Tech 18 09-27-2006 05:54 AM
Anyone Full Float a waggie rear end? Dan Stewart General FSJ Tech 8 08-16-2006 09:55 PM
Full Floating D44 Rear aatcman General FSJ Tech 9 07-08-2006 10:24 AM
Dana 44? always thought so. dweezle General FSJ Tech 2 12-22-2000 03:11 PM


All times are GMT -6. The time now is 07:13 AM.


Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
corner corner