All-Wheel Drive System

R

repoman

New member
Hello
first time posting here.

Hoping someone here May help me identify my transfer case model & also if I am missing something on it.

1960 b-120 all wheel drive.
Info on the awd is what I cant locate.

I purchased the 2 volume service manuals & owners manual from binder books , that were supposed to cover this truck.

Neither really seem to cover my drive system as far as identification, proper operation, fluid (assuming 90 weight?), etc.

I called them back on it - but got no help - said they would look into and call back - never did.

I was under truck yesterday scraping gunk off the front face of the tcase looking for numbers and I uncovered an open hole in lower right corner. Im guessing its 3/8 or 1/2" with no threads unless back inside.

The hole was packed full of hard grease.

Does anyone know if I am missing something here ? It doesnt look like a drain hole as no threads.

Also, im sure there must have been manuals updates that would have covered this system - any one know ?

I would greatly appreciate any help.

Jim
 
Welcome to the forum jim. I'm surprised at the lack of response from bb. I'd stay persistent on that front. I encourage you to post pictures of the items you're attempting to identify.
 
Thanks scoutboy74, glad to be here.
Will get some pics.

Was under it again today & still cant find any numbers on the tcase.

Fired up first time without a gas can & hose - took spin around yard - felt like it was in 4x4 even though lever was full forward - checked shift positions - sure enough, seems to be one short - dont think its going into 2 wheel drive (yet).

Other than she feels like a beast !
 
I've been perusing what literature I have pertaining to the a-b-c models, which is likely the same as what you have.

Transmission section q, page 1 of cts 2040 details case t-140, having two ranges and two control levers.

Transmission section dd (supplement 139) page 1 of cts 2166 details case t-141, having two ranges and a single control lever.

Transmission section I (supplement 259) page 1 of cts 2048-y details a family of four similar cases...t-152, 153, 155, & 156, having two ranges and two control levers. The 155 & 156 models are heavier duty and have a one-pint larger fluid capacity.

There are good pictures of each model, but there are no shift pattern legends displayed for any of them. Original fluid spec called for straight mineral oil (gl1) ranging from sae 75 (cold climes) to sae 140 (hot climes).

Does any of this jive with what you have, or is it new information?
 
I did some of that last night also.

To me it looks like a np 202 , I have not yet related that to the IH number assigned to it.

It is a single lever unit & the pattern should be (from full foreward to full back) : 2hi , 4hi, neutral, 4lo - I think.

The lever moves very easily thru positions, I just dont think im feeling it go into 4 positions.

I have had locking hubs & auto locking hubs. Im just not familiar with the IH "all-wheel drive" system & cant find any thorough info on it.

If this is like other auto locking hubs, it should unlock if in 2wheel drive and back up and hit brakes - but I still see front drive shaft turning when I go foreward.

Maybe that is normal to some extent ?

Dont really have much brakes just yet - have to pump em up.
So I will try again after being sure I have them pumped up goon.

Thanks
 
You could be right about it being an np 202. I googled "t-141" and came up with some positive hints, including a couple threads from binder planet discussing np 200, 201, 202 which were in common use in IH vehicles during the late 50's and early 60's. There is also a link to a fabco website that has a parts catalog in downloadable pdf form. It has exploded views of every sub-assembly in the unit.
Have you been able to locate the line set ticket for this rig? If it is still present and legible, (big if) it would list every piece of equipment that your truck was ordered and assembled with originally.
I could be wrong, but I strongly suspect your truck pre-dates automatic wheel hubs by long time. I think what you have are drive flanges which don't allow the front wheels to free wheel like selectable hubs do. Once again, there were a number of front driving axles available for this vintage range, so making certain id of what you have would be most helpful. The line set ticket would be invaluable in this process.
 
That would explain the drive shaft spin (no free wheeling hubs).

No, dont have the build sheet on it - plan to order one though.
 
Transfer case:
tc-141 is IH code 13141 which is a new process model 202, single lever - two speed transfer case.

Shift pattern from front to rear:
2h-4h-n-4l, photo attached.
 

Attachments

  • NP-202 Shift Knob.jpg
    NP-202 Shift Knob.jpg
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Thanks for the IH codes for the np 202. That helps.

And also for verifying the 202 shift pattern - wanted to be sure it hadnt been switched out - as it doesnt feel like its going into 2hi.

Do you have any insight into the '60 all wheel drive system ?

Specifically - do the hubs stay locked into the front drive shaft all the time , with only the t.case disengaging ?
 
repoman said:
Do you have any insight into the '60 all wheel drive system ?

Specifically - do the hubs stay locked into the front drive shaft all the time , with only the t.case disengaging ?
Click to expand...

It depends on whether your truck has locking hubs or not. Can you provide an answer to this, or post a photo of the front axle/hub?

"IH" used the term "all wheel drive" for '4 wheel drive'. It is not anything special or unusual. Merely a manual shift transfer case and two drive axles.
Locking hubs were an option early on, either from the factory, or dealer installed, or aftermarket.
Factory stock, with no option: will have the standard axle drive flange bolted to the axle hub. This engages the front axle shafts all the time and the only disconnection is at the transfer case. The front axle shafts & front drive shaft will always rotate when the vehicle is moving, even when the tc is in 2h and neutral. Nothing wrong with this.
This would be the same as if you left locking hubs locked all the time.
 
Which would help explain why all of the pictures of the 3/4-ton 4x4 vehicles with the big-6 lug wheels either didn't have front hub caps or had the standard hub caps without a hole in them to access lock out hubs.

If there are no lock out hubs there is no need for a hole in the hub cap.
 
Ok, thanks
you verified what scoutboy said.

Now I know my hubs are always locked - - im 99.9% sure I have the np202 - - & "all wheel drive" aintnuttin special.

Appreciate the feedback guys.

Will see if I can upload some pics of 'ol "fire dog"
 
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