Thread: Isuzu MSA Gearbox to LT230

Not ever having had one apart, I would have to make an educated guess, that's the main shaft that sticks out the back, so a replacement shaft may be a massive outlay...

Back in the day when people in the LROC Sydney were converting series land rovers, we had a member/machinist make replacement shafts for C4 Ford autos to series TF and New Process 4 speed manual boxes to series transfers. The biggest problem was to get the machined shaft hardened without bending. (They needed to be hung vertically not laid horizontal)

The issues would be the OD sizes of the splines, shoulders and bearings which must step down rather that up and down to be able to load the gears from the respective ends.

1/ I don't know of any one

2/ Its certainly possible But why? .There are 6 different bearing surfaces 4 different splines as well as a thread to control end float shaft run out is max.008" standard .002 which is easy till the heat treater gets his hot little hands on it The mainshaft as it is will handle anything a ****y little 4b will put it thru till you put a crappy 10 spline for the TC gear on the end of it

Noel

Originally Posted by Ancient Mariner

1/ I don't know of any one

2/ Its certainly possible But why? .There are 6 different bearing surfaces 4 different splines as well as a thread to control end float shaft run out is max.008" standard .002 which is easy till the heat treater gets his hot little hands on it The mainshaft as it is will handle anything a ****y little 4b will put it thru till you put a crappy 10 spline for the TC gear on the end of it

Noel

but it wouldn't have the problems of the interface being out of line or need additional lubrication for the interface splines etc.

Originally Posted by Ancient Mariner

1/ I don't know of any one

2/ Its certainly possible But why? .There are 6 different bearing surfaces 4 different splines as well as a thread to control end float shaft run out is max.008" standard .002 which is easy till the heat treater gets his hot little hands on it The mainshaft as it is will handle anything a ****y little 4b will put it thru till you put a crappy 10 spline for the TC gear on the end of it

Noel

Diana just wants to convert the MSA box to the Land Rover philosophy. Take something that is well designed and works, then put one weak part in it that will cause oil leaks and premature failure...

Originally Posted by Lotz-A-Landies

but it wouldn't have the problems of the interface being out of line or need additional lubrication for the interface splines etc.

Why would it be out of line I had .002" TIR when all bolted up the shaft is a firm fit to the flange .It could be Loctited but this would defeat being able to replace the shaft in 15 minutes if needed .I tried to post a pic of a Ford Toploader to series mainshaft we used to make but Manage Attachments panel has altered and says my JPG files are a invalid attachment

Noel

Originally Posted by Lotz-A-Landies

but it wouldn't have the problems of the interface being out of line or need additional lubrication for the interface splines etc.

Isn't the alignment controlled by the accuracy of the adapter housing?
I don't see how a one piece mainshaft is going to help with that.

My thought is that a splined adapter shaft (like AncientMariner has done) is a more accommodating of any slight misalignment than a stub shaft like TheGrubb's.

Regarding spline lubrication - if its a real issue how about running the adapter wet?

Steve

Hi Lotza. Although not answering your question it may help to know that Outcast got their shafts made my an axle manufacturer (obvious I guess ), such that shafts bolt to the existing MSA5 drive flanges, with 10 spline into to LT230 input gears.

Do I recall somewhere someone talking about EDMing/weld adapting the LT230 input gear to a different spline count and making a better spud shaft to match? From memory, some parts of the input gear do not have much thickness to play around with.