T34

M

magnum04rt

New member
Newbie here.....just picked up a 75 200 / 392 / 5spd w/od / Dana 70 / Dana 80 / 10,000 gvw

can someone direct me to ....or attach a link... Where I can get more familiar the t34 tranny?
 
Welcome to ihon!

First off, that sounds like a really special rig! A high gvwr version with the maxi-axles!

But I find something kinda curious, we don't discover this stuff until someone asks a question like this!

The '74/'75 (and yes there was some limited production of '76 stuff) doesn't show to have been available with a t-34/code 13034 transmission! At least that code is not shown in a parts list (mt136) for the '74/'75/'76 vehicles which were somewhat different as compared to the '69>'73 d body trucks (mt124).

However, that was a very common "option" transmission up through eop on the '73 fullsize stuff.

It's very possible the transmission was swapped in at some point. Even swapped in by the selling dealer...in that case, a notation should have been made on the lineset ticket so that the original owner and selling dealer would have a record of what was done.

But then, the "correct" version service manual for your rig (cts2303) does cover the t-34/t-35/t-36 boxes!

Welcome to the world of ihc ambiguousness! This is a very common occurrence!

All of these manuals are available from ihon.

However, if ya have a more specific question/need regarding these transmissions, I can sometime furnish a couple of pages of the parts breakdown or service specs if need be. We bend over backwards to protect our two suppliers of the reproduction service literature we have available...without them to supply this information we'd really be in trouble when playing with this old junk!
 
There are definite signs that this tranny has been swapped in. At this early point in the game I am assuming it is a t-34......hence the need for more info. Up front, I was hoping for an illustration ( or pics) that May depict some of the characteristics specific to a t-34.

The shift pattern is
1 2 od
r 3 4

additionally there are 2 different fire truck identification badges / tags affixed to this unit.

The engine is not set back as it should be for a 75 even though it is titled as a 75.
 
IH "offered" 2 5 speed transmissions on "light duty" IH vehicles (pickups and t/as). To get one, you had to "special order" the vehicle.

One was a 5 speed direct (t-36) and the other a 5 speed od (t-34).

They are truck transmissions (big and heavy) and were available in loadstars / etc, also.

The bell housing is unique to the 5 speeds.

Gear ratios for a t-34 is 6.21, 3.43, 1.81, 1.00, .082

the shift pattern for a t-36

1 2 4
r 3 5

so, if you shift from 3rd "up", there will be a "big gap" (and bog) if you have a t-34.

There was discussion on another board some time ago about being able to tell the difference between a t-34 and t-36 externally, but no definitive answer was arrived at. One time I took my t/a in for service and a mechanic asked if it had a t-34. I said yes; but he still crawled under it (at night) and came back up and said it was -- I have no idea what he looked at.

About the "no set back" -- maybe your truck was originally a 500???

You can order the line setting ticket (LST / build sheet) using the serial number and it will tell you how the truck was delivered from the factory.
 
In '74 & '75 the t-34, t-35 & t-36 5-speed manuals were updated and coded as t-494, t-495 & t-496 (13494, 13495 & 13496), all factory available. The t-494 was od in fifth. The t-495 & t-496 were direct in fifth. They all have a pto opening on both sides of the trans. The newer models now have synchronized 1st gear. The difference between the t-495 & t-496 is that one has a deeper 1st gear then the other. I have the gear ratios somewhere, but I can't find them now.

The "one ton" trucks in '74 & '75 did not get the designation of '300' they were model 200, same model number as the 3/4 ton.
The all wheel drive (4x4) one ton 200's did not have the set back engine, wider springs, etc. Like the 1/2 ton 150 & 3/4 ton 200 did.
They are essentially the same as the '73 model 1310 4x4.

Your rear alxe should be a Dana 70 if it is a single wheel model, or an IH ra-15 if it is a dual wheel model.
10,000 gvw was the maximum for the 200 one ton in '74 & '75, possibly the highest for previous years also.

You May notice that your engine is drilled & tapped for the side mounts as used in the 150's & 200's set back models, but it is mounted with the front horseshoe mount. Also your front frame rails are clearanced slightly for exhaust manifold clearance.
 
1975ih200 said:
in '74 & '75 the t-34, t-35 & t-36 5-speed manuals were updated and coded as t-494, t-495 & t-496 (13494, 13495 & 13496), all factory available. The t-494 was od in fifth. The t-495 & t-496 were direct in fifth. They all have a pto opening on both sides of the trans. The newer models now have synchronized 1st gear. The difference between the t-495 & t-496 is that one has a deeper 1st gear then the other. I have the gear ratios somewhere, but I can't find them now.

The "one ton" trucks in '74 & '75 did not get the designation of '300' they were model 200, same model number as the 3/4 ton.
The all wheel drive (4x4) one ton 200's did not have the set back engine, wider springs, etc. Like the 1/2 ton 150 & 3/4 ton 200 did.
They are essentially the same as the '73 model 1310 4x4.

Your rear alxe should be a Dana 70 if it is a single wheel model, or an IH ra-15 if it is a dual wheel model.
10,000 gvw was the maximum for the 200 one ton in '74 & '75, possibly the highest for previous years also.

You May notice that your engine is drilled & tapped for the side mounts as used in the 150's & 200's set back models, but it is mounted with the front horseshoe mount. Also your front frame rails are clearanced slightly for exhaust manifold clearance.
Click to expand...

This is really odd.....my second binder is a 1975 all wheel drive 200 / 392 / 4 speed/ Dana 44 and Dana 80 (srw)/ 7700 gvwr
this one is definately has the engine set back and has the rear dump style exhaust manifolds. This truck appears to be original in all aspects. It spent it's whole life with a huge camper on it's back. (perhaps the Dana 80 was ordered as a camper special option?)
 
magnum04rt said:
newbie here.....just picked up a 75 200 / 392 / 5spd w/od / Dana 70 / Dana 80 / 10,000 gvw

can someone direct me to ....or attach a link... Where I can get more familiar the t34 tranny?
Click to expand...

My bad......
Correction:
75 200 / 392 / 5spd w/od / Dana 70 / Dana 70 / 10,000 gvw
 
Fwiw re your second 75 200

with a gvw of only 7700 lbs, the rear axle should be a d60 -- unless it has been swapped. With a d80, the gvw should be higher...

My 73 1210 t/a (d60) has a gvw of 8200 lbs.

There is not much of a "gap" in the "6".
 
Probably because there are not that many around...

And, I think the IH info (service manual) is still copyrighted (via binderbooks).

There is a section in the full size IH service manual on the 5 speeds.

I have read posts, but I cannot remember who built the transmissions for IH (fuller?, spicer? Or both or somebody else over the years). And, the transmission might have another "name" when used by another manufacturer.
 
IH used several builders of transmissions, depending on the platform/application; the big 4 were warner, fuller, clark, and spicer. There were a couple that were sourced from IH.
One of my repair manuals shows that the t34 and t35 were from fuller.
 
There are service kits for these boxes available. The gasket/seal kit is a separate item from the bearing kit.

We're not currently stocking this stuff but May in the future since our supplier, dave the gear man, is in the middle of closing his retail shop and re-locating. In fact, I have most of dave's transfer case-related inventory here at my location now.

Try some of the online suppliers for this stuff, primarily the industrial power transmission suppliers since that tranny is a clark-based product.

Here's an operation I use on occasion, call 'em and they can refer you to a retailer or distributor:

welcome to all transmission
 
Since the t-34 (and t-36 / t-35) is a truck transmission, I would call places that maintain / fix the long haul semi-trucks --like peterbilt; frieghtliner; mack

ask them if they rebuild transmissions. If they do not, find out where they have the transmissions rebuilt -- then, you will probably find a parts source...

You could even contact the local International dealer -- maybe they can still source parts for the transmissions since they were also put in loadstars, etc. You do not need to tell them it is in a light line vehicle.
 
Thanks for the info guys.

Off the top , any idea of the amount of torque that holds the output yoke is to the output shaft?
 
Companion flange nut to mainshaft torque for the 7/8-14 retaining nut is 190>230 ft./lbs., threads clean and lubricated.
 
Well, I am looking for input and output seals and a gasket kit for the t-34.
I took a look at the ring & pinion, transmission and transfer case parts - drivetrain.com They show that they have a bearing and seal kit for an International Harvester t-33 transmission that came on 392 equipped trucks.

This is their line item listing. The cast number on the case of my t-34 is "592"

8cyl 392ci t33 1969-75 5spd, iron case, cast "440288c2"

any idea if t-33 parts are interchangable with a t-34?
 
According to a doc stewart tech tip (I printed) the number bk287 is the correct kit.

Also, pilot bearing bca205ff

and, he mentions a "special" gasket for the shift tower sp14379

you can find this tech tip if you search on binder planet.

Doc stewart is a member of this site and you May be able to pm him, but he is mostly on binder planet, I think.
 
one Question Please. Is there and model numbers stamped into the case on the T34 T35 T36. Or the newer models like the13495-495-496. I'm 73 and know IH inside out. But I never could find any # on these trans. Just casting #. Maybe one of you boys can tell me. I have T-34 and the T-35 T-36 trans here at the shop. Ever have a T-495 and T-496. But Nobody can say if they have a #
 
Typically the transmission has a small metal tag attached to one of the cover bolts.
The tag will have the IH part number on it.
 
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