large hole transfer case

does anyone know approximately when they went with the large hole transfer case for the model 18?

I have three transmission / transfer case assemblies, and I'm trying to get a feel as to which, if any are the large hole cases.

thanks

kamel

 

According to info from Novak, D18 cases behind all engines except the v-6 had the small bore ( 3 5/8") index hole. The v-6 had the large ( 4" ) bore only from the factory. What transmissions are attached?. Any t-case with the T-14 will probably be the large bore because it was only used with the v-6 ( my set up in my '69). There is also a thread showing differences between early and late model D18 cases (back a week or two).

 

This has been my thinking until Billy rebuilt his D18 behind a :hurrican:

If I'm not mistaken he said his was a large hole in a '61.

Maybe he can confirm this or clarify if it was original to his JEEP.

 

I don't know about years used or changed but heres a pic of the 2. The large hole was mounted behind my T-14a and if you notice in the pic there is an adapter ring that i am guessing made it a small hole so it would work in my V6/T-14a/D-18 set up (stock) 1970 CJ5.

 

Nice job Tim. Thanks for great pics.

 

And a pic of mine behind a T-14AA

 

Is it safe to assume that the large hole was only used on the t-14 application, or was it used with the T-86 too?

I saw the two pictures -- is it safe to assume one can tell a large hole from a small one by the shape of the transfer case?

If so, then I have a bunch of small hole transfer cases, and zero large hole transfer cases.

Zero - I counted them twice.

I am working on getting a T-98 from 2wd to 4wd, and have access to a large hole adapter. I'm just trying to make certain that I can use the adapter on a T-98. I can get a large hole T/C - that isn't the problem.

If the large hole adapter is unique to the T-14, then the bolt pattern of the adapter-to-transmission could be different from the T-86, and if it is different it would not fit on the T-98.

Or, perhaps the bolt pattern on the rear of the T-14 is the same as a T-86, and then everything will fit perfectly.

Unfortunately, the adapter in question is no where close to me, so I'm doing all this by phone.

any further input would be appreciated.


I already have the front input shaft and bearing retainer, so it is the adapter for the transfer case that I am working on.

 

large hole with T86?
affirmative, they use a bearing adapter to mate to large hole

 

Is the adapter like what Tim posted on the left? I didn't have that 'ring'. Maybe it supposed to be there and isn't. Shoot, the JEEP sure has ran good for missing that part.

 

T86 version pictured below
big difference between T90 and T14

 

But you can put the T-86 bearing retainer on the back of a T-90 and and use a large hole transfer case . Nickmil.

 

Great pics Mudwieser. Some one pointed out the different case shapes as well in a previous thread. Does any know if the earlier case shape on the right (twin sticks) ever came as a large bore unit? Just curious.

 

I can confirm the t 86 is a large bore, if that helps at all.

 

Back to the two pictures posted here on an earlier post.

Is it safe to assume that ALL large hole cases look like the large hole case in the picture and ALL small hole cases look like the small hole case in the picture.

I'm not talking about the size of the hole, but, note the shape of the top of the casing as you move from right to left.

That way one could tell large hole/small hole from just looking at the case when it is attached to the transmission.

 

The "ring" in the first picture is the bearing retainer for the rear main bearing of the T-14a. My 71 has the large hole case and bearing retainer.

 

---------------------- A Ha !!! ---------------------