Thread: Isuzu MSA gearbox into 6x6

Thanks mate, I have a similar setup 4bd1 msa and series transfer box,, nice to get an idea of what it looks like off.

The extension housing has a division with a seal in it.





Bolted up.



Drive flange on. And made sure its staked this time


Last time I staked it through the back. This time I drilled and tapped a half inch hole above where the nut is and staked it with a blunted small cold chisel.

Adapter flange bolted up.


Keith

Thanks for posting 123Rover50.

I'm probably not understanding something. How can the staked nut in the photo be responsible for gear change difficulties? Working with my setup the nut would seem to be there simply to hold the drive flange in place.

The photo perspective had me fooled, but I now see the grooves in the adapter are very coarse by the peaks just in the right of frame.

Originally Posted by workingonit

Thanks for posting 123Rover50.

I'm probably not understanding something. How can the staked nut in the photo be responsible for gear change difficulties? Working with my setup the nut would seem to be there simply to hold the drive flange in place.

The photo perspective had me fooled, but I now see the grooves in the adapter are very coarse by the peaks just in the right of frame.

You are right. I dont understand it either. The nut had worked loose and I thought that may have let the shaft move back and forth.
Something has worn because the rearmost gear has about 4mm of end play whereas the replacement box gear has only 1 mm or so.

The LT 95 WSM states the spacer and transfer gear should be locktited to the shaft. Of all the boxes I have stripped not one was tight and all showed some flogging of the shaft splines.
This time I thought I would cut some grooves to make it easier for oil to get in and see if that makes a difference.



Keith

Just looking at the spline wear in the shoulders of those gear splines I wouldn't reuse that gear Keith. It is going to have slop there when you accellerate/decellerate unless you loctite it. Even with loctite it will probably eventually loosen. It's important to loctite the sleeve/spacer as unless you do it will remain stationary inside the seal while the shaft turns and act like an oil pump and transfer oil from the transfer to the gearbox. I would also check the mainshaft splines for wear where the gear sits on it.

I had better rephrase my last post - the transfer oil will end up in the adaptor instead of the gearbox as I stated!!!
Any chance of a photo of the front of the T/C where the adaptor bolts on Keith?
Did you machine/drill the front yourself or get someone else to do it.

I'm a novice re contact patterns, but the top photo seems to show the contact is well inside the tooth length; yet seemingly worn at the other end. Mismatching contact due to worn shimming?