Rumble/Judder Problem Updated.

I have had a good look underneath at prop bolts, props and U spring bolts plus I have had the wheels balanced but I still have this rumble in 3rd & 4th gears. Although I said last time I could drive out of it after giving it a run yesterday that's not true it just gets faster so less obvious. Any more suggestions ~ gearbox??

Engine mounts? Tried holding the gear lever ie its not a rattle rather than rumble?

Gearbox output shaft bearing? Loose hand brake drum? Well worn UJ?
Try dropping the rear prop off and driving in 4WD. Do you have free wheeling hubs? I have had one break up giving this sort of bother.
When rear prop is off spin rear wheels to see if they are smooth+ have a wiggle on the diff input flange.

How strange - just posted a thread with a similar problem - should have searched more thoroughly I know.
all is well apart from a knocking, rumble in 3rd and 4th.

Mine only happends when its cold - its goes when the oil gets up to where ever the noise is coming from .

Is your diff oil level ok?

Hi, I finally got around to taking the rear prop off and the uj's look ok to me. Now I am no mechanic far from it I am learning slowly as I go but I put it in four wheel drive and the car doesn't move! I jumped out and the front prop shaft is spinning but no wheel movement does this mean my front diff has gone ?

Hi, I finally got around to taking the rear prop off and the uj's look ok to me. Now I am no mechanic far from it I am learning slowly as I go but I put it in four wheel drive and the car doesn't move! I jumped out and the front prop shaft is spinning but no wheel movement does this mean my front diff has gone ?

Please ignore last update as in my rush I stupidly forgot the FWH, so I will have drive to the front so I will test drive and update again ~ sorry to mess you all around.