Hi again.

2003 disco 89k.

Still have a vibratión when decelerating at high speed ( 85 MPH ) very slight now. Kind of like a hummmmm and feel it in the middle of the truck behind drivers seat.. and a little on the wheel. If I step on the gas again it goes away.

So far I have changed:

Front Drive Shaft
All U Joints with grease fittings
Rotoflex
Serviced Tranny ( Disco Mike´s way )
Checked Differentials ( both no leaks and good Oil ) no service yet.
Transfer with a very slight leak.
Checked Wheel Balance twice ... Tyres have about 25% life left.
Wheel Hubs. ( pair of used ones but they were both in good shape )
Serpentine Belt.
New rotors and Breake pads.


Tranny shop says it is coming from the transfer case ( NO WAY RIGHT ? )

Running out of ideas.
Please help.

 

Transfer / gearboxbox mountingsmight be a good bet.

 

Thanks Urban Panzer.

I can only find 1 Rubber Mounting on my Work shop Manual.
Do you Know were I can get them , I cant find them on Rover Connection or e-bay.

 

Coming from the middle of the drivers seat mmmmm, when you look up from doing your MPH calculations are you by any chance straddling a yellow line? [>:] umpgh!

 

Crawl under the truck and inspect all 3 mounts, the drivers side engine mount can crack and drive you nuts.
Service the diffs and t/case, if for no other reason then to see if you have metal chips, not mud, on your metalic drain plugs, this can tell you alot.
And per an ad on the television, never say "NO WAY" cause it may be countered by "WAY".

 

Crawled Under.the truck pushing up ( with Jack )under each Mount and The drivers side seems to have a little More play than the other 2 even do the seem hard enough for me to push them manually.

Can this Mount be causing these vibratión?

No metal chips on Differentials Or T Case drain Plugs ( slight leak on T Case ) If it were the Differentials Or T case Vibratión would Be constant and not only when decelerasting from 80 MPH right ?

I was thinking even do I replaced all U Joints mabe 1 is not installed propperly , there is a very slight Play on the rear Drive Shaft and U Joint looks OK. How Much Play is acceptable. ?

 

Thanks For the reply Night Train but no .... No yellow lines in Mexico they are all White and don´t cause a vibratión.
But very Good guess.

 

No play (ZERO) is acceptable in the universal joints.

Not sure what you mean by play in the rear driveshaft. Is it axial, radial, etc.

What do you mean by play?

Inspect the balance weights on both driveshafts, sometimes if the shafts have them, these weights may fly off causing the need to rebalance the shafts.

 

Where in Mexico? If your roads are like the roads I travel in baja, you can likely fix your vibration and maybe save your life by driving slower!



How is getting parts in Mexico?

 

Thanks Unimoged.

Play is Radial about a quarter inch or when I grab it I can Turn It. ( clock wise and counter clock wise sort to say )

On the front U Joint of the rear DS . Rotoflex is brand new.

Should i discard mountings and focus on The U Joint ?