Dana T18 TRANSFER CASE TIMELINE

1941 - 1945, MB, GPW Technical questions and discussions, regarding anything related to the WWII jeep.
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Chance
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Re: Dana T18 TRANSFER CASE TIMELINE

Post by Chance » Tue Nov 08, 2016 1:51 pm

Here are some pics of T/C my son is rebuilding:

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I'm a little confused as to whether this is mainstream WW2 or post CJ2A. Also (I have no idea) is this color paint similar to Marine Corps forest green found?
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Chuck Lutz
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Re: Dana T18 TRANSFER CASE TIMELINE

Post by Chuck Lutz » Tue Nov 08, 2016 4:37 pm

If that one has TWO holes on the front where the bearing retainer goes that the two shift rails for the T/C pass through rather than the larger semi-oblong opening and it has a 3/4" shaft where the caged roller bearings ride....that is the later WWII and early CJ2A case.

From the casting number....C18-15-10-1....those are the features you should find...

If so....you are good to go!

PS....looks like US Forest Service, National Park Service Green from before they went to the pale sickly looking light green. Or...what some guy had after painting something else.
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Re: Dana T18 TRANSFER CASE TIMELINE

Post by Chance » Wed Nov 09, 2016 3:31 pm

Thanks Chuck if I understood you right then I should be good to go with this one. We measured 3/4" low side of spline across to low side of spline. I also see two separate holes as you described. Very interesting thought in U.S. Forestry Service too.
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Re: Dana T18 TRANSFER CASE TIMELINE

Post by JAB » Wed Nov 09, 2016 3:44 pm

Chance wrote:
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No, the shaft in the middle of this picture is the intermediate shaft that the caged roller bearings ride on. This needs to be 3/4" for your purposes.
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Re: Dana T18 TRANSFER CASE TIMELINE

Post by Sean Collins » Thu Nov 10, 2016 8:40 am

Chance wrote:Here are some pics of T/C my son is rebuilding:
...I'm a little confused as to whether this is mainstream WW2 or post CJ2A...
As Chuck said, you have either an MB or very early CJ-2A case. Count the gear teeth to determine which.

Large cluster gear: 33 teeth = MB, 34 = CJ-2A

Small output shaft gear: 27 teeth = MB, 26 = CJ-2A

Large output shaft gear: 34 teeth = MB, 39 = CJ-2A

However, your case has been modified to fit a T-90 transmission w/2nd generation idler shaft lock plate. See area around 2 countersinks has been hogged out:

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It will still work with a T-84, but you'll need to use a later T-90 style shaft lock plate, narrowed to fit between the T-84 shafts (bottom one in the photo):

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Dana T18 TRANSFER CASE TIMELINE

Post by Chance » Thu Nov 10, 2016 1:48 pm

Sean I can't believe I didn't even notice that! Thanks for pointing that out to us and we'll count the teeth too. Kinda sucks, but at least we know what to do though to get it back up to speed. Really appreciate that because we would have spent however long trying to figure that one out.

JAB - just measured, yes 3/4". Thank you for your help on that. It's much appreciated.

DIFFERENT Dana T/C, with C18-15-10-2 and 1 1/8" intermediate shaft. I know it is not MB\GPW but were these used on M38s? Curious about that and also best place to sell it other than ebay. Is there a better forum somewhere else? Thanks.

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Re: Dana T18 TRANSFER CASE TIMELINE

Post by Sean Collins » Thu Nov 10, 2016 2:47 pm

Chance wrote:...DIFFERENT Dana T/C, with C18-15-10-2 and 1 1/8" intermediate shaft. I know it is not MB\GPW but were these used on M38s?
That's a 2nd generation made for T-90, used from March thru Oct. '46.

Casting date looks like H21-6? (Aug. 21, '46), and serial number (J46996) is appropriate for that time.

Retains the T-84 interlock slot though, so could still be used with one.

Later CJ-2A, CJ-3A and M38 used the C18-15-10-3 casting WITHOUT the T-84 interlock slot.
 

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Re: Dana T18 TRANSFER CASE TIMELINE

Post by gearhead » Sat Nov 12, 2016 8:07 pm

I have had several over the years that were in WW2 jeeps with the Brown and Lipe tag and look to have been modified to accept the large intermediate shaft.

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Re: Dana T18 TRANSFER CASE TIMELINE

Post by JAB » Mon Nov 14, 2016 12:58 pm

Yes, it wasn't uncommon in the '70's to machine the case and gear to accept tapered roller bearings with a kit from Advance Adapters and IIRC Novak, or the larger shaft, or both.
-Jeff

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Re: Dana T18 TRANSFER CASE TIMELINE

Post by Chance » Mon Nov 14, 2016 1:10 pm

What's a fair price for this T/C, the one last posted here above. I am going to sell it, your opinion would be helpful.
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Re: Dana T18 TRANSFER CASE TIMELINE

Post by Chance » Mon Nov 14, 2016 2:31 pm

Sean, is it worth having a machine shop fill that back in?
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Re: Dana T18 TRANSFER CASE TIMELINE

Post by tamnalan » Mon Nov 14, 2016 3:35 pm

Chance wrote:What's a fair price for this T/C, the one last posted here above. I am going to sell it, your opinion would be helpful.
I bought a similar transfer case, complete with gears and internal drum brake assembly at the Findlay, Ohio show a couple of years ago for $100. The guy had two of them. I use my T-84 with it and converted it to an external drum brake. The nice thing about the postwar transfer case (besides the bigger intermediate gear shaft) is that you get a better low range ratio... from approximately 2:1 to about 2.5:1. I'm doing a tapered roller intermediate gear conversion to mine now.

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Re: Dana T18 TRANSFER CASE TIMELINE

Post by Sean Collins » Sun Nov 20, 2016 7:59 am

Chance wrote:Sean, is it worth having a machine shop fill that back in?
Sorry Chance, missed your question earlier.

No, it's not worth it. It will work fine as-is with either T-84 or T-90. Just can't use the T-84 lock plate, have to use the later T-90 style lock plate.

The T-90 idler shafts are spaced farther apart than T-84, so the stock T-90 plate won't fit a T-84. You'd have to grind it shorter, or fabricate one from scratch.
 

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Re: Dana T18 TRANSFER CASE TIMELINE

Post by Chance » Sun Nov 20, 2016 12:32 pm

Thanks Sean - no worries. So we will need a T90 lock plate. I got that much . Then you're saying we will need to grind it shorter to work with a T84. Want to make sure I'm tracking you. Appreciate all the help.


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Re: Dana T18 TRANSFER CASE TIMELINE

Post by wc56daveyboy » Wed Apr 19, 2017 6:25 am

I ran across this tread as I too was searching about why my recently purchased T90 w/ transfer case attached had a BROWN-LIPE tag on it.


After reading this tread, I went out and looked at the now de-greased unit and looked it over for serial numbers/ casting info.

Heres what I found:

Aluminum Tag reading BROWN LIPE GEAR BOX
absolutely NO stampings faint or otherwise in the aluminum tag, so no serial numbers obtainable

Rear of transfer case has the following:

GPW 7705 with a big "F" script (SO I know its a ww2 case)

transmission currently mated to this transfer is a T90A transmission.

this unit, as it is, was remove from a running jeep and stored for years by now deceased previuos owner, so cannot ask any questions. His son just does not know..

So, my question is, after trying to understand all the posts here, did this transfer case have to be reworked to accept the T90?

I see someone noted that it was a common thing in the 70's or there abouts to machine the ww2 cased to fit the T 90 transmission

and if Im about to repair this unit for use, and need to order bearings and such, I am thinking that a standard "kit" offered with all
bearing and seals might not do it for this combination. I mean I intend to break this apart anyway, this week, so can take more pics and see better the internals.. hopefully, if the T-case was in fact machined to accpet the T90 input, the bearing and seal? would still be there and numbers I can get off of it. I hope
Attachments
brown lipe tag.JPG
brown lipe tag.JPG (100.68 KiB) Viewed 4004 times
GPW transfer serial.JPG
GPW transfer serial.JPG (101 KiB) Viewed 4004 times
GPW Transfer w BROWN LIPE tag.JPG
GPW Transfer w BROWN LIPE tag.JPG (120.52 KiB) Viewed 4004 times
GPW transfer w t90.JPG
GPW transfer w t90.JPG (112.25 KiB) Viewed 4004 times


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