M35A2 goes "clunk clunk clunk" in Reverse

[Dasgog]

Hello

So the Deuce is a '72 with 11,000 Miles on it so not a lot of wear and tear. Not too far off it was all taken apart and put back together and well maintained. I drive it once a week and usually not too far but it warms up enough and when I get home it goes into reverse just fine. This week I have noticed after two very long drives that when I return home, it will not go into reverse without the truck skipping and clunk clunk clunk and if I force it I know something will snap.
The only constant I notice is that it only does it after its really heated up.. On a fresh start after sitting it'll work fine.
The truck drives 1-5 gear like a dream and there are no noises whatsoever. Lever brake engages and I notice nothing abnormal.
Originally I thought maybe the gear oil was old and maybe wrong kind and getting too hot so I changed transfer case/transmission with 80x90 gear oil and today it did the same.
It does this in LOW and HIGH gear reverse... I engaged the 4x4 lever and heard it hiss and then it went in reverse fine in high/low and then brought it back to 2x4 high/low and worked fine.
Not sure if I got lucky or if there is something else going on.

Suggestions?

 

[cattlerepairman]

Adjusting clutch pedal free play as per the TM?

If it only made a clunking noise when backing up, I would have suspected the parking brake assembly/moustache spring.

 

[Dasgog]

Adjusting clutch pedal free play as per the TM?

If it only made a clunking noise when backing up, I would have suspected the parking brake assembly/moustache spring.

Ive not looked into that to be honest... And yes it is indeed only in reverse.

 

[cattlerepairman]

Ive not looked into that to be honest... And yes it is indeed only in reverse.

You have the noise standing still when PUTTING it into reverse - that suggests clutch to me. If it went into reverse fine but then resisted backing up and/or clunked, I would say parking brake.

 

[Dasgog]

You have the noise standing still when PUTTING it into reverse - that suggests clutch to me. If it went into reverse fine but then resisted backing up and/or clunked, I would say parking brake.

That is precisely what it does. It goes into reverse fine but when I actually try to back up it clunks/skips.

 

[frank8003]

interesting spring

Search results for query: moustache spring

I have a new one here someplace.

 

[davidb56]

Have you crawled under it and looked at the short shaft U joints yet?

 

[Dasgog]

Have you crawled under it and looked at the short shaft U joints yet?

I assume you mean the short shaft from transmission to transfer case? I have... I wiggled it and really didn’t notice anything out of the ordinary. It clunks a little but nothing that made me 2nd guess. Unless it’s supposed to be absolutely tight... And that little clunky wiggle is magnified under load.

 

[glcaines]

Undoubtedly the parking brake.

 

[Dasgog]

Undoubtedly the parking brake.

So with that being said as well as others saying and agreeing to the same, what exactly should I look into as far as which part of the parking brake would be doing this?

 

[davidb56]

TM 9-2520-246-34-1 page 2-117 in the deuce TM section on this site. 048083.pdf

 

[dmetalmiki]

If you have a habbit of setting off from reversing in second gear that can and does mess up the sprag clutch if you do not have an air shift six wheel drive deuce.

 

[frank8003]

If I could finds my glasses.............
I think they loist...............
Have to wait for my better half when She gets home to help me
I type now by just the memoriy as I can't see theboard....................it is named a jackshaft
One or and I saw it in only one, TM does referenc that ews to it only
Very special bolts and special nujts
One of the most overlookeed parts of a Deuce.
Wou;ld you like more information
I wish I hasd eysight like Chuck Yeager / ....
There is many lube points, almost always missed in there.
I wish to be young

 

[davidb56]

If I could finds my glasses.............
I think they loist...............
Have to wait for my better half when She gets home to help me
I type now by just the memoriy as I can't see theboard....................it is named a jackshaft
One or and I saw it in only one, TM does referenc that ews to it only
Very special bolts and special nujts
One of the most overlookeed parts of a Deuce.
Wou;ld you like more information
I wish I hasd eysight like Chuck Yeager / ....
There is many lube points, almost always missed in there.
I wish to be young

Yea. its called a short shaft, jack shaft, and a companion shaft depending on who you are talking to. its only about 1 foot long, but when someone uses a cheater pipe on the bolts AND nylocks, its no fun getting it out.

 

[Welder1]

I assume you mean the short shaft from transmission to transfer case? I have... I wiggled it and really didn’t notice anything out of the ordinary. It clunks a little but nothing that made me 2nd guess. Unless it’s supposed to be absolutely tight... And that little clunky wiggle is magnified under load.

There should not be any clunking out of the jackshaft. If there is any looseness that is an issue you need to find out the source. Could be worn u joints, loose bolts, worn splines. You may want to remove it for a close inspection.


Eddie C

 

[Dasgog]

There should not be any clunking out of the jackshaft. If there is any looseness that is an issue you need to find out the source. Could be worn u joints, loose bolts, worn splines. You may want to remove it for a close inspection.


Eddie C

In all honesty I’ve not done much with the truck since this initial discussion as I’ve been busy. I did replace the trans and transfer case fluid to 80/90 and it still did the clunk. I then verified all “shafts” were tight and nothing wobbly or loose bolts. What I did then was grease each fitting having to do with the hand brake , maybe wasn’t greased enough? , snd the 3 times I drove it it went in reverse just fine. Maybe it’s just intermittent and I got lucky. Also I did look at the whole brake assembly and the mustache spring thing and all looks good.
Maybe the brake lever was sticking?

anyway if I find anything else I’ll post. Thank for for the help

 

[Dasgog]

Hello

So the Deuce is a '72 with 11,000 Miles on it so not a lot of wear and tear. Not too far off it was all taken apart and put back together and well maintained. I drive it once a week and usually not too far but it warms up enough and when I get home it goes into reverse just fine. This week I have noticed after two very long drives that when I return home, it will not go into reverse without the truck skipping and clunk clunk clunk and if I force it I know something will snap.
The only constant I notice is that it only does it after its really heated up.. On a fresh start after sitting it'll work fine.
The truck drives 1-5 gear like a dream and there are no noises whatsoever. Lever brake engages and I notice nothing abnormal.
Originally I thought maybe the gear oil was old and maybe wrong kind and getting too hot so I changed transfer case/transmission with 80x90 gear oil and today it did the same.
It does this in LOW and HIGH gear reverse... I engaged the 4x4 lever and heard it hiss and then it went in reverse fine in high/low and then brought it back to 2x4 high/low and worked fine.
Not sure if I got lucky or if there is something else going on.

Suggestions?

Well it seems to have done it again. To start off, I replaced Front/Rear Differentials, Transfer Case and Transmission all with new 80/90 Gear Oil. I greased every fitting including Emergency Brake and everything in between. The “mustache” spring is secure and fine. Emergency brake pad and area is clean and looks good.

I drove about 20 miles up hill till I hit dirt road and rocky terrain. Enabled front wheel drive and the lockers. Drove whole way 3rd gear low around 1500 RPM whole time. Drove like butter.
After an hour of that I died aged 4 wheel drive and the lockers and drove home 20 miles 5th gear high 2000 rpm smooth as can be. Got to the house out it in neutral then reverse and it went back fine then clunk clunk clunk . Like I don’t wanna say gear grinding, more like heavy resistance like if I forced it something would snap. I put it in neutral, put tcase in low then High again and tried and it went remaining 10 feet fine.

I just don’t know what to do.

 

[doghead]

Confirm you have 3 springs on the parking brake system.

 

[doghead]

Do both shoes release from the drum and not touch it?

 

[doghead]

Need some help with Parking Brake issue

So my parking brake hasn't been holding the truck on an incline for a while and I decided to adjust it today. I found the shoe liners are shot and I also found that the "outer shoe return spring" (?) is just leaning against the bracket that the adjusting bolt threads into. Also found that the...

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