M809 series t case sprag replacement - Steel Soldiers::Military Vehicles Supersite

Trango · 03-02-2010, 19:32

Hi Folks,

Does anyone know if there is (even the concept) of a permanent sprag replacement for the M809 transfer cases? Or, are there any pics out there that detail what the sprag looks like?

I'd love to see if there's a hardpart that could replace the sprag in function, but not have the same modes of failure.

Best,
Bob

KsM715 · 03-02-2010, 22:13

There's a few threads floating around that discuss welding the sprag but I have yet to find any definitive "how to" on how to do it.
You can also put a valve in the main airline going into the trans. to basically disable the sprag. So you could weld it and go full time 6x6 or put in the air valve and have a "part time" case.

Try reading thru these threads see if they help you out any.

sprag gear transfercase question

http://www.steelsoldiers.com/5-ton-up/47520-i-need-some-help.html

Trango · 03-02-2010, 22:51

This is what I was looking for. Many, many thanks!

Floridianson · 03-03-2010, 06:26

Guess I'm lucky mine has a air shift just like the Deuce transfer. Just puts in engagement when in reverse or first high or low range. Was thinking about a an air switch on the dash and remove the one from the trany. Then again first high range in a 5 ton might be all the faster you want to go in the nasty stuff.

bbf · 03-03-2010, 06:54

my went out and i just replace the t case did not want to go threw trying to fix the t case and then put it back in to find i still did not work

militarysteel · 03-03-2010, 07:40

yeah the sprag is just a totally bad idea, they should have just went with air engagment from the start. full time all wheel drive is not needed, you only need the front end when you need it, other wise the wear and tear plus worse millage then what you are already getting. not a fan of the 5ton.

BKubu · 03-03-2010, 09:23

Quote:

Originally Posted by Floridianson

Guess I'm lucky mine has a air shift just like the Deuce transfer. Just puts in engagement when in reverse or first high or low range. Was thinking about a an air switch on the dash and remove the one from the trany. Then again first high range in a 5 ton might be all the faster you want to go in the nasty stuff.

James, either you have something that I have never ever heard of in an M809, I misunderstood your post, you did not describe what you have well, or you are wrong. I have never heard of an airshift in an M809 series truck. John Winslow, Jeff Symanski and others have installed an airshift lever, but that just disables the sprag as stated above. With that set up, you flip the switch when you want to put things back to stock (rear wheels slip, front wheels pull). If you are referring to the air sound when you shift to first or reverse, the sprag is not engaging at that point, it is just switching from forward to reverse engagement (but nothing is engaged yet). As I said, perhaps I am not clear on what you were saying. Can you clarify, please?

jasonjc · 03-03-2010, 09:35

Keep in mind that in the 5 ton or 2 1/2 ton sprag t-cases the front and rear out puts DO NOT HAVE THE SAME GREARS. You can not "make" it full time. Unless you put new grears in the case.

Trango · 03-03-2010, 10:03

Jason,

Do you know if there are gears available to make the 5 ton M809 case a full time case? I understand that the front is overdriven by about 7% - are there gearsets readily available to eliminate that overdrive?

Best,
Bob

BEASTMASTER · 03-03-2010, 19:48

why does anyone buy one of these trucks if the first thing they want to do is change it???????????

" IF IT AIN'T BROKE DON'T FIX IT "