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strange "bump" when decelerating quickly

stampy

Active member
1,321
22
38
Location
Henderson. NC
Ok I have this problem on my m1009 that I had since I bought it, I already searched and found nothing. If I pull up to a stop sign and decelerate quickly there is a noticable "bump". I have new brakes all around and that didn't fix it, new shocks too, as well as a new to me driveshaft. If I approach the stop sign slow enough there is no "bump". It's annoying but I wanted to make sure it wasn't going to cause me trouble down the road. any ideas?
 

MDSA

Member
705
12
18
Location
Valdese, NC
Don't know if this will help, but I had a similar strange noise in my M37. Mine was a rattle. It developed after I had done some PM about 2 months ago. Took it for a drive, and it rattles!? Sometimes I heard it, sometimes I didn't. I tried to figure out what I had done when I changed oil, greased, etc, but couldn't find anything loose. Took me about 3 weeks to remember that I had put a can of brake fluid in the glove box. It was rolling around. No more rattle.
 

BIG_RED

New member
385
0
0
Location
Winnipeg, Manitoba
I just started noticing something like that on my M1009 too.. It sounds almost like there might be movement in the calipers, so when they stop being dragged by the rotors (the truck stops), they move back to where they usually sit. I have given everything a wiggle and it all seems solid.
 

stampy

Active member
1,321
22
38
Location
Henderson. NC
I will do that! Thanks! I know it isn't the junk in the truck as I removed everything from it one time just to be sure. I haven't checked the motor mounts. Is there an easy way to replace them? I chained up my Mercedes 300sd's motor and lifted (gently) with a forklift to replace the motor mounts on it without having to unbolt anything on the motor but I have never done a CUCV.
 

BA232

New member
Steel Soldiers Supporter
26
1
3
Location
Aurora, OH
I have the same thing on my m1008, kind of a dull thud and only at higher speeds. I was thinking it was something in the drive line, I'll be checking my motor/trans mounts.
 

stampy

Active member
1,321
22
38
Location
Henderson. NC
Yes checked the tire Thanks! I actually feel the bump I thought maybe the rear axle was moving slightly. I hope it is the motor mounts!
 

stampy

Active member
1,321
22
38
Location
Henderson. NC
No not yet. I will do that. I did check the spring to axle attachment. If it's not the motor mounts looks like it may be spring bushings. I hadn't even thought of that thanks!
 

Pawnshop

Active member
1,798
23
38
Location
Austin/Cedar Park Texas
Check your transmission fluid. I had a leaky line on my M1009 and sometimes when the fluid was low and I would rapidly lift off the throttle the tranny would go into a neutral state for a moment, then give a noticeable "bump" when it re-engaged, sometimes after I came to a full stop. I am referring to a felt "bump" not an audible one.
 

stampy

Active member
1,321
22
38
Location
Henderson. NC
Ok thanks...lots to do tomorrow! It has been normal, but I haven't checked it in a few weeks. It's possible, but I haven't noticed any "slop" in the drivetrain. It seems to be tight. I may have to mount a video camera (one of those reverse cameras) underneath to see if anything is moving around when I come to a stop if it is not any of the above stuff. Oh and I have both a felt and audible bump.
 
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Goose2448

New member
1,500
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0
Location
TEXAS Hanover, Pa/Bokeelia, Fl
I had a similar thing on my civy C20, and came to the conclusion it was the rear drums engaging. Only did it when I hit the brakes. I never did figure out how to fix it. My best guess was that the proportioning valve was sticking, or it had to do with the load level brake system. Never sounded too bad when I had a good load on. Just food for thought.
 

O.D. Fever

New member
545
2
0
Location
Howard City, Mi.
Hello Stampy, also check the tranny and case mounts, push up and down on the driveshafts at trans and case, also look for oil leaks at the seals, could be bad bushings for the shafts. Or it could be nuts and bolts rolling around in your head..:-D
 

moody

New member
1
0
0
Location
NE Fla
I'm just getting educated in the CUCV world, but this complaint is a common one for owners of full size Broncos. The fix for Broncos is to lube the slip joint in the rear driveshaft. Although I've never seen a M1009 rear driveshaft, I imagine it's also a DC with a splined slip joint since both vehicles deal with a short wheelbase and a relatively steep rear driveline.

Anyway, there's one more thing to consider while your underneath checking bushings and mounts and what-not.

Good luck.
 

Grega

Member
205
1
18
Location
St. Paul Nebraska.
Someone here awhile back had your same problem, turned out it was the transmission mount. Also if you changed your driveshaft or other componet a while ago, recheck the bolts, something may have come loose.
 

edpdx

Active member
794
75
28
Location
Oregon
Stampy, when you figure this one out, please post the fix. I am having the same issue. It seems that when I let off the accelerator at anything over a moderate speed, I hear and feel a bump that feels like the rear axle or u-joint at the rear driveline. I don't know enough (yet) about rear suspensions to know what to look for; but I'll have a look at the topics that have been covered here.

What is axle wrap- is this possibly the start of this condition?
 
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