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  #1  
Old 09-11-2007, 01:46 PM
mike Moran mike Moran is offline
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Default What tranny would you use behind a 7.3 NA

hi all,
Acquiring a 89 7.3 NA from a S1600 medium duty truck with 152k. The tranny is blown so my buddy is giving me anything i want off the truck. I already have the engine unbolted and will be yanking it this week. Any known problems with this engine?
My intention is to put it in a 70 1200 Travelall. What tranny would you guys use?. Should i take the bellhousing too or is that only good for the monster 5 speed that its hooked to now. I am open for all suggestions. Fabricating is the fun part as I did when i put the mercedes 5 cylinder in my 73 travelall that is now a wagonmaster. That has been about 3 years i guess and is my daily driver. Runs great on veg,diesel or whatever and gives me 20 mpg consistently.
If i went with an automatic is the c-6 my best bet or could i use one with an overdrive?. Whatever is the concensus i will start lookin for a wrecked complete vehicle. I find its best to have the donor vehicle at hand when doing this stuff.
thanks Mike
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  #2  
Old 09-11-2007, 02:34 PM
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John Donnelly John Donnelly is offline
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Default Re: What tranny would you use behind a 7.3 NA

Given some recent experiences with a Ford F-250 with a 6.9L and a C-6, I would opt for a manual transmission wherever and whenever possible.

Ford, Diesel, and Automatic just don't seem to meld well.

I would get the bellhousing and the clutch from the S-series also. It will expand your transmission options for certain.

-John
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  #3  
Old 09-11-2007, 05:02 PM
cartwright cartwright is offline
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Default Re: What tranny would you use behind a 7.3 NA

I would use a ZF 5 or 6 spd.
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Old 09-11-2007, 11:24 PM
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WRENCH MAN WRENCH MAN is offline
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Default Re: What tranny would you use behind a 7.3 NA

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Originally Posted by cartwright View Post
I would use a ZF 5 or 6 spd.
I wouldn't, I would use a cast iron tranny.

What's wrong with the tranny out of the S1600?
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Old 09-12-2007, 02:28 AM
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CareyWeber CareyWeber is offline
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Default Re: What tranny would you use behind a 7.3 NA

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Originally Posted by WRENCH MAN View Post
I wouldn't, I would use a cast iron tranny.

What's wrong with the tranny out of the S1600?
Nothing wrong with them, but the ZF Five and Six speeds have been proven to be good tranys in trucks up to Ford F-550 with Power Stroke @ much higher horse power levels than the 7.3 NA will ever have.

If it was going in a Truck like a 1600 or up I'd say stay with a mediem duty truck trany, but in a Travelall I'd get a ZF.

Carey
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  #6  
Old 09-12-2007, 05:42 AM
truck mechanic truck mechanic is offline
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Default Re: What tranny would you use behind a 7.3 NA

Hey Mike
I am looking at the same swap for my pick up. I have a na 7.3 and a zf 5spd. I am going with that set up. I would love to do an auto but have pulled to many of those to count. Just keep in mind you will need the addapter that goes between the motor and trans from a Ford.
Paul
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  #7  
Old 09-12-2007, 06:03 AM
mike Moran mike Moran is offline
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Default Re: What tranny would you use behind a 7.3 NA

thankyou to all for the respones. Seems that the zf 5 speed might be the way to go. I will start my search for one in my travels.
As far as the tranny in S1600 now it is blown. That is what took the truck off the road in the first place. My friend was quoted a price of 4,500$ to fix it and he opted not too because he was buying a new truck anway.
I also like the sugestion of a Allison 545. Seems that many school busses came with them and it should be more than able to push a travelall down the road.
Would anyone know what model tranny is in that S1600 now. I believe it is a 5 speed?
Mike
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  #8  
Old 09-12-2007, 08:21 AM
MarkO MarkO is offline
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Default Re: What tranny would you use behind a 7.3 NA

Since you are having to purchase a transmission anyway, why not purchase a used school bus and use everything out of it--engine, transmission, wiring harness, motor mounts, transmission mounts, etc.

There are whole fleets of IHC conventional buses on the market with the T444/T444E or the DT360 out there with good power packages. Since you are in the rust belt you won't care if the body is shot which should lower the price considerably. Around here, a good running used school bus is going to cost about what you would have to pay for a new or good used transmission (I purchased a good running IHC/BB bus with the 6.9/AT540 for $1500.00 and a good running IHC/Carpenter with the DT466/AT643 for $1500.00). In addition, you would get all of the parts and pieces to make your new power package work.

At the end of the project you would have either a really ugly storage shed or about 5 tons of scrap at $100 per ton.

The Allison AT500 series transmission in a light line vehicle would be real overkill. With the proper cooling system you would be hard pressed to ever hurt it. The only downside is it would not have a park position in the transmission. But if you were to get the power package out of bus with hydralic brakes it would come with a medium duty truck sized driveline emergency brake.

The Allison AT500 series uses a direct drive top gear. Since it has 4-speeds you should be able to put some real highway cruising gears in the rear end and still have some first gear grunt power.

Just my two cents worth.

Mark O.
Castle Rock, WA
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  #9  
Old 09-12-2007, 12:00 PM
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Jim Grammer Jim Grammer is offline
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Default Re: What tranny would you use behind a 7.3 NA

Quote:
Originally Posted by mike Moran View Post
Would anyone know what model tranny is in that S1600 now. I believe it is a 5 speed?
Spicer 52xx series is one likely suspect.
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  #10  
Old 09-12-2007, 03:58 PM
IHWillys IHWillys is offline
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Default Re: What tranny would you use behind a 7.3 NA

Another option is the T3x IH 5-speed transmission. I have almost all the parts for this.

Parts needed to do this:
- SAE#2 flywheel housing for 6.9/7.3 IDI
- SAE#2 clutch cover(trans adapter) for IH T3x transmission
- Starter
- Flywheel
- Pilot & throwout bearings
- clutch disc/pressure plate

I have the first 3, and possibly the last 2(will have to wait and see after I get a flywheel).

Atleast one caveat learned thus far: There are 2 different sizes of indexing circle for the starter on the flywheel housing, obviously the starter and housing need to match on this point. I suppose because they use the same bolt pattern a small circle starter could be used on a large circle housing with a ring used to center the starter.

I like this option for several reasons. One is the inexpensive aspect of the IH T3x transmissions. I have several and the most expensive was a rebearinged T34(OD) at $500. The others were less than half that, one of which is a freshly rebuilt T35(DD). Another reason is that one can easily change from one set of ratios to another by swapping in another model of the T3x transmission. The T35 is a nice set of ratios for a pickup truck diesel as it provides what a close ratio Warner T19 offers plus a 'granny' 1st and reverse and T36 is even 'closer', all in a cast iron case that is an IH product. No they don't shift like the newer transmissions, they're definitely more truck-like. Also the throw-out is done the same way in the SAE clutch cover as in the lightline gasser bellhousings. So swap the throw-out cross shaft from an IH gasser bell into the SAE clutch cover and the stock external clutch setup works for swaps of IDI into lightline vehicles(provided clearance, etc).

If anyone sees fault with my assessment please "speak up" as I like to learn as much as I can before going the school of hard knocks route.

Ken
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