TC output housing

[kolbafresser]

Hello,
does anybody knows if the output housings of the sprag transfer case is interchangeable with the airshift type. I have a sprag type in my truck and want to put an airshift type in, but the airshift TC I got has a few oil leaks and my sprag one is dry, so i thought of only changing the output housings.

 

[clinto]

Do a search using the words "sprag AND housing" by author "gringeltaube" and I suspect you will re richly rewarded (i.e. there is exactly a description of what's necessary).

 

[clinto]

I am bored so I went digging on my own.... try these threads.......

http://www.steelsoldiers.com/deuce/28749-sprag-airshift-conversion-question.html

http://www.steelsoldiers.com/deuce/3299-air-shift-reb-kit.html

 

[kolbafresser]

thanks for the info. Today i figured out myself that it isn't so easy. I turned the input shafts of the TCs and the sprag type has a lower ratio to the front output than to the rear. The airshift type is 1:1
I think i will install the whole airshift tC after changing the seals.

 

[clinto]

thanks for the info. Today i figured out myself that it isn't so easy. I turned the input shafts of the TCs and the sprag type has a lower ratio to the front output than to the rear. The airshift type is 1:1
I think i will install the whole airshift tC after changing the seals.

Yes, I believe there is something along the lines of an 8% difference in output speeds if I remember Gringeltaube's post correctly.

In your part of the world, are air shifts readily available?

 

[kolbafresser]

i got the airshift from france, but it's not so far away from my home, i live near the border. I paid 600 EUR for it, i thinks that are 460 $ (google said)

 

[gringeltaube]

Yes, I believe there is something along the lines of an 8% difference in output speeds........................

Correct, and the math is easy to do from this old diagram showing the number of teeth for each gear: R-output is 22T:33T while F-output is only 21T:34T.
22 div.33, times 34, div.21 = 1.0794. That is, for 1 complete revolution of the front propeller shaft the rear has to turn 1.08 revs., or in other words, the rears have to slip 8% combined, to allow for the front axle to start getting traction.

The airshift TC does not have that 21/34 gear set, it connects the front output directly to the rear via that air actuated dog-clutch.

G.