Landcruiser T/D Vibration

Is that problem in "low gear" as in first or second gear ( normal driving) or in 'low range'???

Bilbo

Parso,

How did the front diff blow?

I was thinking of the uni joints but they will vibrate at high speed.

Could a tooth be missing from the pinion gear in the front diff. It could have snapped of after the diff lock was put in, but this would have a problem at any speed.

Do you get noise/vibration at any other speed?

Could be a chipped tooth on first gear.

Wayne

Had similar, ended being a stuffed main shaft.

Parso, had a friend with a Turbo HJ78 that developed a vibration while accelerating.
They had alot of trouble locating it thinking it was in the transmission but ended up being a motor issue. Apparently Toyota developed a small valve to be added to the fuel system that fixed it. Can sympathize with your diff problem as I'm on my forth one.
Craig................

Based purely on the layout of a typical gearbox and assuming the gear you are using is 5th Gear (i.e "top" as you refer to it), I reckon it's the gearbox mainshaft. Either the bearings at each end of the box are u/s ( more likely the front of the mainshaft at the front of the box) or the small roller bearing that sits inside the primary shaft that supports the mainshaft. I'd discount the front diff or any other thing that is not common only to "top gear" use. The front diff is in use all the time and then prob would show up in all gears. The above mentioned bearings are the only bearings that would be under load at your stated observation times in a conventional gearbox. However, this is based on an "old mechanic's" (me) view of things and I've never seen a drawing or the inside of a Cruiser gearbox. However, if 5th gear is an "overdrive" gear and that it sits in the back of the box as is normal in an overdrive gearbox, then it could the back mainshaft bearing. Are you showing any signs of gearbox oil around the back of the box or dripping out of the front of the box where the bellhousing meets the engine block??

Bilbo