5 Ton Problems

[USMC Devildog]

I just bought my first 1970 5ton and i think i know the problem but im hoping you all can help me some more. I just got it today and on the way home i was driving great but when i got close to the house it acted like the power was cut in half could barley get out of 3 gear and then it stated to make a loud bang from the transfer case area about every 100ft. I think the sprag has gone out but i wanted to see what you all thought before i did anything
Thanks for the help
Semper Fi
And if anyone is in the middle tennessee area that really knows these things that could come drive to see for sure i would be ever greatful

 

[ranchhopper]

Sounds like the sprag engaged itself and the loss of power was the driveline binding on the hard road.

 

[porkysplace]

Here are some related threads ;
5 ton sprag transfer case a power divider?
5 ton t case issues
how to adjust the sprag
Why do I have no front drive in forward, but do in reverse?
Testing 5 ton Sprag?
Sprag Adjustment for 5 tons
Sprag substitutes?

 

[USMC4302]

Devildog -- I can't help you with your issue (I sure hope it works out well), but I am new here myself and have recently acquired a 5-ton (817) that I have been working the snot out of and having big fun doing so.

http://s160.photobucket.com/albums/t172/stovebltr/Milliman/5%20ton/?albumview=slideshow

Just wanted to say Semper Fi back at ya.

John

 

[jedawson1]

I'm in Christiana/Murfreesboro, TN but I am only familiar with the 939 series and know nothing about the sprag other than no one on here likes them. Where did you get your truck? How far was your recovery? I hate to think the sprag engaged on pavement but will be reading some of the above threads to learn more. Good Luck.

 

[USMC Devildog]

USMC4302 Very nice truck what year i have the same truck dump bed and all do you have a winch on yours also, ya im sure it will all work out just takes time but having a blast at it so far.

 

[USMC Devildog]

Jed i got my truck in tullahoma from a friend so not to far and so far im liking it very much i have pulled the front driveshaft foe the time being until i can find a replacement sprag

 

[WILDBOY6X6]

HI I have my 1st 5 ton too,an 818 (was last used in my cal guard unit too) also worked on all types of trks from HMMWV'S to HEMTT'S at a cal guard FMS shop.
The noise sounds like transfer is on the way out,1 sign is the spedo drive will twist around and brake the cable this happend to 1 in my unit then later the transfer broke and had to go tow it in.

steve

 

[Gunner0311]

This is the downside to the All Wheel Drive set up that the sprag is the centerpiece of.

I am beginning to think the "part time" system of the M35 series is better in the long run. You shift the transfer case to power the front driveshaft when you need it, and
otherwise leave the front axle spin on its own. A lot less headache in the long run.

I have never had any problem with the sprag on my five ton, but posts like these do
make me realize that the sprag is a "weak link" in an otherwise strong driveline.