Forum Home Forum Home > CJ-2A Discussion Area > Tech Questions and Answers
  New Posts New Posts RSS Feed - overdrive compatibility question
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

overdrive compatibility question

 Post Reply Post Reply
Author
Message
LesBerg View Drop Down
Member
Member
Avatar

Joined: 09 Apr. 2014
Location: Athol, ID
Status: Offline
Points: 1515
Post Options Post Options   Thanks (0) Thanks(0)   Quote LesBerg Quote  Post ReplyReply Direct Link To This Post Topic: overdrive compatibility question
    Posted: 11 July 2018 at 2:10pm
I haven't searched yet, I'm posting from my phone.

Will an overdrive from a T15(I think)/D20 combo fit a T90/D18 setup if I have the right trans output gear?

I have a line on one, but it's a 400 mile road trip. The guy is actually selling a complete power train for a Buick V6 jeep (sans motor) for $1000, but is willing to part out.

Thanks,
Les
1948 CJ2A 157713 24" Stretch "Old Ironsides"
1st Armored Div
6th Infantry Reg
3rd Infantry Bn
Headquarters Company #161

rubigo in quo speramus - "In Rust we Trust"
Back to Top
oldtime View Drop Down
Member
Member
Avatar

Joined: 12 Sep. 2009
Location: Missouri
Status: Offline
Points: 1244
Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2018 at 7:41pm
Are you sure about that ???
D-20 O.D. would be an especially rare find. 

For D-18 transfer cases the main concern is tooth count of your gear set. 
Early 2.43 (Pre 1955) or later 2.46 (Post 1954)
Currently building my final F-134 powered 3B .
T98-A Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
Back to Top
LesBerg View Drop Down
Member
Member
Avatar

Joined: 09 Apr. 2014
Location: Athol, ID
Status: Offline
Points: 1515
Post Options Post Options   Thanks (0) Thanks(0)   Quote LesBerg Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2018 at 9:22pm
Do those numbers translate to 26 and 29 tooth respectively?
 Let me see if I can find the picture...


here it is. This doesn't look right for a D18. The top of the case and shift linkage look like a D20 to me.



Edited by LesBerg - 11 July 2018 at 9:31pm
1948 CJ2A 157713 24" Stretch "Old Ironsides"
1st Armored Div
6th Infantry Reg
3rd Infantry Bn
Headquarters Company #161

rubigo in quo speramus - "In Rust we Trust"
Back to Top
nofender View Drop Down
Member
Member


Joined: 10 May 2016
Location: Western MA
Status: Offline
Points: 789
Post Options Post Options   Thanks (0) Thanks(0)   Quote nofender Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2018 at 9:26pm
Originally posted by LesBerg LesBerg wrote:

Do those numbers translate to 26 and 29 tooth respectively?
 Let me see if I can find the picture...

yep.
46 CJ2A rockcrawler
46 CJ2A resto-mod
14 JKU (daily driver)
15 Grand (Mrs Nofender)
Back to Top
LesBerg View Drop Down
Member
Member
Avatar

Joined: 09 Apr. 2014
Location: Athol, ID
Status: Offline
Points: 1515
Post Options Post Options   Thanks (0) Thanks(0)   Quote LesBerg Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2018 at 9:35pm
See my last for the pic. He has a complete driveline from bell adapter to brakes. From talking to him on the phone, it sounds like the axles are MB/GPW.

He's holding it for one week while another guy tries to scrounge up the cash. I could do it with a long term loan from the local strip-mall loan shark, but all I really need is the overdrive.

I could only swing that (buying the entire driveline) if other people wanted the rest of the parts and were willing to pay shipping. That said, if I can score the overdrive and it won't fit my D18, I should be able to work a deal with someone.

edit
is the tooth count in any way related to the intermediate shaft diameter, and are the 26 & 29 tooth gears interchangeable without swapping the intermediate gear cluster (I doubt this)?


Edited by LesBerg - 11 July 2018 at 9:39pm
1948 CJ2A 157713 24" Stretch "Old Ironsides"
1st Armored Div
6th Infantry Reg
3rd Infantry Bn
Headquarters Company #161

rubigo in quo speramus - "In Rust we Trust"
Back to Top
Mark W. View Drop Down
Member
Member
Avatar

Joined: 09 Nov. 2014
Location: Silverton, OR
Status: Offline
Points: 3923
Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2018 at 10:39pm
From Novaks web site

"The Dana 18 is the only cast iron, offset drive (meaning that both front and rear driveshafts are in-line) transfer case found in production Jeeps."

The transfer case in your photo must be some version of the D-18
Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962
Back to Top
bobevans View Drop Down
Member
Member
Avatar

Joined: 31 July 2005
Location: Pittsburgh, PA
Status: Offline
Points: 305
Post Options Post Options   Thanks (0) Thanks(0)   Quote bobevans Quote  Post ReplyReply Direct Link To This Post Posted: 11 July 2018 at 11:22pm
It is possible to swap D18 gears into a D20 case and to use the TeraFlex Low18 gears you HAVE to use a D20 case or a very late D18 case. The rear output from a D18 fits on the D20 case. It does look like a D20 case to me, but obviously has both outputs offset.

'48 CJ2A

'56 DJ3A

'79 CJ7

And two of them actually run!
Back to Top
LesBerg View Drop Down
Member
Member
Avatar

Joined: 09 Apr. 2014
Location: Athol, ID
Status: Offline
Points: 1515
Post Options Post Options   Thanks (0) Thanks(0)   Quote LesBerg Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2018 at 3:36am
Originally posted by bobevans bobevans wrote:

It is possible to swap D18 gears into a D20 case and to use the TeraFlex Low18 gears you HAVE to use a D20 case or a very late D18 case. The rear output from a D18 fits on the D20 case. It does look like a D20 case to me, but obviously has both outputs offset.


That was my thought. Is that the mod known as the "Super 18"?

The guy was really positive that the OD unit would fit the D18 and seemed to know his jeeps. He pulled this out of his 47 CJ2A to replace it with a different setup.

If this has the D18 internals, then this ought to fit if I have the correct bull/output gear, correct?

1948 CJ2A 157713 24" Stretch "Old Ironsides"
1st Armored Div
6th Infantry Reg
3rd Infantry Bn
Headquarters Company #161

rubigo in quo speramus - "In Rust we Trust"
Back to Top
48cj2a View Drop Down
Bantam Trailer Moderator
Bantam Trailer Moderator
Avatar
Sponsor Member

Joined: 22 July 2005
Location: Central, IL
Status: Offline
Points: 3695
Post Options Post Options   Thanks (0) Thanks(0)   Quote 48cj2a Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2018 at 7:33am
Its a D18 but with a single shifter (later model).
 
A Dana 20 would have the output where the OD unit is installed
 
Art C

47 CJ2A #134955 Project
48 CJ2A #206759
62 L6226 Station Wagon #58167 10900
45 T3-C #191 Project
47 T3-C #12183
http://www.bantamt3c.com
http://www.48cj2a.com
Back to Top
bretto View Drop Down
Member
Member
Avatar

Joined: 05 June 2010
Location: Orem, Ut
Status: Offline
Points: 1888
Post Options Post Options   Thanks (0) Thanks(0)   Quote bretto Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2018 at 8:25am
Looks like T14 tranny mounted to a dana 18 with a single stick (super-18).  You can see T14a on the trany cover.
I'd say the OD on will work as long as you have the right gears.

Found this on the web.
"The single stick 18 was limited to a specific number of jeeps, It was found behind a Buick V6 with either a T86 or T14 transmission. The shift pattern is 2High all the way up, 4High Neutral and then 4low. These transfer cases use the big hole texas bolt pattern like the spicer 20s, the have also been refered too as "Super 18's""

Back to Top
oldtime View Drop Down
Member
Member
Avatar

Joined: 12 Sep. 2009
Location: Missouri
Status: Offline
Points: 1244
Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2018 at 10:38am
Les, your pic shows what appears to be a normal Big Hole (large index bore) Dana 18.
Jeep used them in CJ's behind Dauntless engines. (1966 through 1971)
From factory they are all 2.46 ratio. 
That implies 1-1/4" intermediate shaft and it has 29 tooth input gear (mainshaft gear).

If someone would ship it then I would be interested in buying that transfer case myself.
I prefer them more than the D18's that are built inside of D20 cases.

Technically 2.43 ratio gears can be stuffed into 2.46 cases and vice versa . 
So know what your buying.
Currently building my final F-134 powered 3B .
T98-A Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
Back to Top
flatfender47 View Drop Down
Member
Member

Sponsor Member

Joined: 09 Jan. 2006
Location: Riverside CA
Status: Offline
Points: 370
Post Options Post Options   Thanks (0) Thanks(0)   Quote flatfender47 Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2018 at 10:44am
Overdrive mated to a T14 is only good for use with another T14.
Won't work with any other Jeep transmissions.
1947 CJ2A 225V6 SM420 D30 PLok/D44 D/Locker Warn OD 5:38s
Back to Top
oldtime View Drop Down
Member
Member
Avatar

Joined: 12 Sep. 2009
Location: Missouri
Status: Offline
Points: 1244
Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2018 at 11:01am
Yeah after a 2nd hard look that certainly appears  to be a 1967-1971 T14 .
So as stated the OD (as Is ) is only good behind a T14 transmission. 
T14 has 10 spline mainshaft so the Warn OD will only fit 10 spline mainshaft.

It's only a good deal if you want the T14 also.
Currently building my final F-134 powered 3B .
T98-A Rock Crawler using factory parts from the Willys Motors era (1953-1963)

http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new
Back to Top
LesBerg View Drop Down
Member
Member
Avatar

Joined: 09 Apr. 2014
Location: Athol, ID
Status: Offline
Points: 1515
Post Options Post Options   Thanks (0) Thanks(0)   Quote LesBerg Quote  Post ReplyReply Direct Link To This Post Posted: 12 July 2018 at 5:04pm
Ok. It seems that the T14 is a light duty 3speed of limited value to me.

Even if the T90 is considered light duty, I would see no real benefit on swapping one light duty trans for another.

Going to "fully synchronized" isn't a priority, so this looks like a pass to me.

The Craigslist posting is current for Yakima, Washington if anyone is interested.

Thanks for the help, guys!

Edited by LesBerg - 12 July 2018 at 5:06pm
1948 CJ2A 157713 24" Stretch "Old Ironsides"
1st Armored Div
6th Infantry Reg
3rd Infantry Bn
Headquarters Company #161

rubigo in quo speramus - "In Rust we Trust"
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.00
Copyright ©2001-2018 Web Wiz Ltd.