Oddball transmission ideas

1mouse3

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If you insist on something different... I would look at IDI transmission pairings in heavier International trucks. This thread has some details...
https://www.binderplanet.com/forums/index.php?threads/ih-7-3-to-ih-5spd.87015/


That is good to know the 404/446 ih have a bell that can be used, that makes it one less rare part for going to sae trans. Founding this bell looks to be fairly easy compared to the one for the 6.9/7.3, @ISPKI these came up in a quick search


https://www.vanderhaags.com/detailview.php?part=24150174
https://www.vanderhaags.com/detailview.php?part=24200861
https://www.vanderhaags.com/detailview.php?part=24551114


You can fit an SAE2 in our transmission tunnel without modification. I swapped my engine and with that am running a medium duty transmission with it. One item to consider is that single shaft overdrive transmissions are not really common. I did manage to find a FSO-6404A which is like a ZF-5 with an extra low gear. So far I really like it.

Another consideration is the clutch disengagement, the stock slave cylinder is not just going to bolt up without a custom mount.

Good to know there would not be much fit issues, I like the spread of the FS-6406N paired with 3.55 final and 35in tires. What did you do about the clutch hydraulics?
 

1mouse3

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The international s1600/ s1654's have the 5 speed I mentioned. 1983-1990 IIRC

These would have the gear ratios of the spicer 5 speeds avalable for what to search for

http://partsmanuals.org/spicerpartsmanuals/Spicer-6000-Series-Parts-Manual.pdf
http://partsmanuals.org/spicerpartsmanuals/Spicer-5000-Series-Parts-Manual.pdf

Here would have the gear ratios of fuller transmisions

https://www.eaton.com/content/dam/e...transmission-specifications-catalog-en-us.pdf

This a good calculator I found for gear ratios

http://www.grimmjeeper.com/new_gears.html
 

mblaney

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I have a ZF5, and I am pretty sure it is for 2wd, you could have the damn thing. Not sure why I am storing it. Came off a 93 IDIT - I scored the engine and tranny just for the turbo.

Maybe if/when the border opens :rolleyes: you can take a vacation to Canada and I will give it to you.
 

ISPKI

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I have a ZF5, and I am pretty sure it is for 2wd, you could have the damn thing. Not sure why I am storing it. Came off a 93 IDIT - I scored the engine and tranny just for the turbo.

Maybe if/when the border opens :rolleyes: you can take a vacation to Canada and I will give it to you.

Helluva community we have here. F-Super Duty trucks take a 4WD transmission though to fit the parking brake on the back in place of the transfer case. That leads me to wonder how medium duty trucks overcome that issue? They dont have air brakes like the big rigs do they?
 

ISPKI

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Something I am trying to keep an eye for my application is the gear ratios. My truck has a 5.13 rear and can barely keep up with highway traffic in the slow lane. Alot of the transmissions I am seeing for these medium duty trucks are direct drive in the final gear so I will have to keep an eye out for one with a decent overdrive.

I believe with a 1.00 final gear ratio, my speed at 3000 RPM would be just under 60mph...no bueno
 

u2slow

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Driveshaft brakes are still done on 2wd transmissions. The matter of using a modular unit on a 4wd trans is a manufacturing efficiency.

Driveshaft brakes are also done on the diff pinion.

You can Google and read about lucas-girling parking brakes too...

EDIT: re-gearing the f-superduty (dana80) may be a good idea.
 

subway

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Good to know there would not be much fit issues, I like the spread of the FS-6406N paired with 3.55 final and 35in tires. What did you do about the clutch hydraulics?

that is pretty close to what I have, 3.55 with 285/75-16 tires.

I actually made an adapter bracket and am using a pull type slave cylinder to pull the stock clutch lever on the side of the transmission. I have pictures in my build thread I can dig up if you need. In my case I could not find a location to put a regular push slave cylinder.
 

1mouse3

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I actually made an adapter bracket and am using a pull type slave cylinder to pull the stock clutch lever on the side of the transmission. I have pictures in my build thread I can dig up if you need. In my case I could not find a location to put a regular push slave cylinder.



That is not a bad fit and adds to the temptaion of one.

https://www.oilburners.net/posts/952566/
 

Booyah45828

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Something I am trying to keep an eye for my application is the gear ratios. My truck has a 5.13 rear and can barely keep up with highway traffic in the slow lane. Alot of the transmissions I am seeing for these medium duty trucks are direct drive in the final gear so I will have to keep an eye out for one with a decent overdrive.

I believe with a 1.00 final gear ratio, my speed at 3000 RPM would be just under 60mph...no bueno

You need to read what subway wrote about single countershaft OD transmissions and the rarity of them. Finding one isn't super difficult, but a direct trans will definitely be cheaper then an OD one. I think I'd get rid of the 5.13 gear set out back before I look for a deep od transmission.

Also, driveshafts do have RPM limits based off of length and diameter. Keep that in mind when you're working on driveline stuff because you don't want to find it out the hard way.

I think I'd prefer a spicer 6+1 with a better rear gear in the dana 80. The trans is fairly common, pretty durable, has even ratio splits, and with a 10:1 granny gear, you won't need so much gearing in the rear axle.
 

Booyah45828

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Nice, that is a much better chart than the one I was looking at.

As of now I am looking to put together a list of donor vehicles and their associated transmissions. To start off, I am researching which medium duty vehicles came equipped with the 6.9, 7.3idi, and the 444E.

Right now I just have the following;

Most likely all of the predecessors of these vehicles dating back to the mid 80s would also be possible donors.

S-series internationals would have them all as well. Essentially any IH from 83 when the IDI came out to about 94, when the T444e/powerstroke took over. I'm not all that sure on parts interchanges with 404/446 stuff.

Best bet would be to get a donor vehicle, and swap like for like. I'm sure you could find something cheap for sale that's rusted out. You might even prefer the heavier duty IH over the superduty:p
 

subway

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That is not a bad fit and adds to the temptaion of one.

https://www.oilburners.net/posts/952566/


hey you found it lol, I did not even have to cut out the opening in the floor when I was running my spicer non overdrive 5 speed. I was able to fabricate a bracket to even use the stock slave cylinder.

another reason to stick with a single shaft medium duty is a dual shaft will take up all the room between the frame rails. this does not give you any room for exhaust or a drive shaft inside the frame.
 

ISPKI

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You need to read what subway wrote about single countershaft OD transmissions and the rarity of them. Finding one isn't super difficult, but a direct trans will definitely be cheaper then an OD one. I think I'd get rid of the 5.13 gear set out back before I look for a deep od transmission.

Also, driveshafts do have RPM limits based off of length and diameter. Keep that in mind when you're working on driveline stuff because you don't want to find it out the hard way.

I think I'd prefer a spicer 6+1 with a better rear gear in the dana 80. The trans is fairly common, pretty durable, has even ratio splits, and with a 10:1 granny gear, you won't need so much gearing in the rear axle.

Yeah the truck is primarily used for log and material hauling, not alot of long distance driving certainly but I will take it out on highways on occasion. I looked up Spicer 6+1 transmissions a bit...wow those are tanks. It seems that they do make them with an overdrive in 7th, .74 ratio only. Also puts 1st at 7.48:1. I just have no idea what they came in.
 

Booyah45828

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Yeah the truck is primarily used for log and material hauling, not alot of long distance driving certainly but I will take it out on highways on occasion. I looked up Spicer 6+1 transmissions a bit...wow those are tanks. It seems that they do make them with an overdrive in 7th, .74 ratio only. Also puts 1st at 7.48:1. I just have no idea what they came in.

The 6+1 was used in a lot of MD trucks from the 90's - 2000's. Before that, they tended to favor five speeds with split rear axles.

You'll find more of them to be the direct version, vs the overdrive, and the overdrive seems to fetch double the money on the internet.
 

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