Rear end vibration GONE--- it was the dogbone!!!

[donjohn]

Now i feel really dumb. i've been having this rear end vibration when i accelerate at low speeds... turns out the dogbone was hitting the differential casing. that was pissing me off for months and i finally found it while tightening my tailpipes

REMOVE YOUR DOGBONE

i also took off the pinion snubber... anybody think i should buy some shorter bolts and put it back on?


One squeak down, about 5 more to go
fixing a plaguing problem always makes you feel better... so i just washed my car too.

 

[slo65]

took off the dogbone quite sometime ago after i did my gears, as for putting it back on, i wouldnt

 

[donjohn]

took off the dogbone quite sometime ago after i did my gears, as for putting it back on, i wouldnt

not the dogbone.. i was thinking about putting the pinion snubber back on... the thing on the topside of the ds that the dogbone screwed into

 

[CManT1914]

I thought the pinion snubber was to keep the differential case from smacking the underneath of the car. I'd put it back on. When I did my lowering springs they came with a shorter one.

 

[final5-0]

I took my db & snubber off years ago when I put my gears in. I do not have my car lowered btw.

Later
Grady

 

[94gts]

WTF is the dogbone and pinion snubber

 

[donjohn]

WTF is the dogbone and pinion snubber

it's at the back of the driveshaft where it meets the diff. the dogbone screws into the pinion snubber (i think it's called). i believe they're meant to dampen vibrations or something, but they were causing me vibrations, so it was quite counterproductive... it's about a 10-15lb weight basically

just like that DAMN 25 LB Vert weight I CAN"T FIND!!!

(it's pretty easy to see that it does nothing, if you look between the ds and diff you'll see a big metal thing hanging down with 2 bolts)

 

[HISSIN50]

As I understand it, it is for harmonics with stock gears. Once aftermarket gears are swapped in, it does not work as well.

I personally would not remove it for just weight savings (weight over the rear is not as bad as elsewhere). I might if I had symptoms going on like Chris did.

Glad to hear that it fixed the issue Chris.

 

[CManT1914]

As I understand it, it is for harmonics with stock gears. Once aftermarket gears are swapped in, it does not work as well.

I personally would not remove it for just weight savings (weight over the rear is not as bad as elsewhere). I might if I had symptoms going on like Chris did.

Glad to hear that it fixed the issue Chris.

That's how I understand the dogbone to work, that it's balanced or whatever for stock gears.

Chris, that 25lb fender weight is right behind the passenger side foglight bracket. If you were to try and remove that foglight (housing, not just the bulb) then you would see it immediately.

 

[94MustangGT5.0]

Chris, that 25lb fender weight is right behind the passenger side foglight bracket. If you were to try and remove that foglight (housing, not just the bulb) then you would see it immediately.

Exactly how I found mine, trying to take out the pass. fog light assembly. There are I believe 3 bolts holding it, and it's about a 5 min. process to get it out. If you have a cold air intake also, you most likely put your arm right past in putting the filter on the backside of your fender. I did, and never even noticed the gigantic thing. However, now that it's out of the way, it makes taking that filter in and out much easier. In case you still can't find it, it looks like a big piece of sewer pipe or something (cast steel about 12-14 inches in length with a rubber damper running throught it.) Good luck!

 

[94TURBO5 O]

Must just be the verts b/c I removed my dog bone and it vibrated like a mofo. I put it back on and no problems. I have aftermarket gears, trans, clutch and ds.

 

[94-302-vert]

Now you kave me wondering if me putting mine back on caused the additional body shake...

DOH, now I gotta remove the dogbone again... This car has been a PITA all year... BUT as soon as the top goes down on a nice day I forget it all...

 

[Venom351R]

My Dogbone came off w/ my gear swap.

 

[94-302-vert]

Mine came off slightly after then last weekend I put it back in...

 

[donjohn]

thanks hissin, chris, garrett and everybody...

i'll look for the 25lb piece when i get back from el beacho

 

[95snoozer]

its behind the corner of the passenger side of the front bumper

and it is a bastard to get out

the dog bone is 9 pounds

 

[jmoore16]

Dogbone?

This is the first time I have heard of the axle damper (9 lb weight) called a dog bone. Believe it or not, the official Ford slang term for this weight is "donkey balls" and it is tuned to the 2.73 axle. The closer you get to 3.00, the more issues you will have with NVH because of the natural frequency of the tires. This is why you don't see 3.00 gears from the manufacturer any more. The farther away you get from 2.73, the less effective the donkey balls are...

They help reduce gear noise in a stock rear end...

 

[jmoore16]

Convertible Weight

The convertible weight is tuned to reduce shake in your convertible. I removed mine for the weight save as a little shake doesn't bother me, won't hurt the car in any way and will take weight off in the right place.

Ford term - "Flobber Dobber" in case you wondered. Flobber Dobbers are also used in the exhaust of many vehicles to reduce vibration of the exhaust system. Look at the hot/cold end attachments of a Grand Marquis for example. Same thing.

You do need your pinion snubber (no Ford term - Sorry) if you lowered your car because the driveshaft can hit the floorpan, scar the driveshaft and I would hate to put a bunch of horsepower through dinged up driveshaft...

Just my opinion.