BJ74 Transmission problems

[Mick]

I have just ( yesterday ) bought an imported right hand drive 1987 BJ74 with 128000 kilometers. During the 800 kilometer drive home I stopped for a break and noticed oil smoke coming from underneath the vehicle, and found that there was oil everywhere from the transfer box back and the transfer box was very hot. I bought a couple of wrenches and discovered the transfer box was overfilled with hot gear oil and the gearbox it'self was dry. I replace the oil in the transfer box and filled the main gear box to the correct level. I made it home ok with several stops to check the oil levels were still good.

The gearbox seems to be working as it should, but what damage am I likely to have done ?
Why should the gearbox oil end up in the transfer box, and how can I fix the problem ?

Thanks

Mick


PS eveytime I go over 100 kph an alarm like a cell phone ringing starts how can I kill the noise ?

 

[wesintl]

Hopefully nothing.. might have reduced bearing life but it didn't lock up eh?

I'm assuming this was a h55f and split case and not an auto? Your seal went between the 2. easy to fix, pop off the back of the case and replace the seal. usually it starves the xfer though..

 

[Mick]

Hi wesintl

No it did not lock up, there were no signs at all until I stepped outside the vehicle. I have done about 400kms since the problem and have not need to drain any exess from the transfer box or top up the transmission. It is a manual transmission.

I will have to get it fixed soon as I need it for the winter, it gets could and snowy here in Saskatchewan, driving something like this is not fun.

Mick

PS What do you mean "usually it starves the xfer though.." ?

 

[wesintl]

PS What do you mean "usually it starves the xfer though.." ?

There is a sel between the tranny and xfer. usually when it goes the vacuum causes the xfter to fill the tranny. Usually the bearings get starved of oil and fail.

also see this tread https://forum.ih8mud.com/showthread.php?t=25176

 

[Mick]

In my case it was the other way around.