Thread: Adaptor shaft

I mentioned this in post 23, had no takers though.
Dougal runs this on his box, no idea how he lubes it though. It does sound the easiest providing you can lube those splines. But if you break the shaft, transcase has to come off.

Originally Posted by slug_burner

Why not just make a shaft that mates to the Isuzu gearbox output shaft at one end (female spline) and the LT230 input gear at the other end. Like the spud shaft used on the ZF auto to the LT230. Given the back of the Isuzu box is sealed then you should not need an oil seal between the adapting case and the LT230, you should be able to run the adapter case wet with the LT230 gear oil. Might still require one shot lube in the female splines of the adapter shaft as I don't see enough oil making its way to the Isuzu gearbox output shaft, even if oil holes are put into the adapter shaft like that used on the LT230 input gear.

The Isuzu box relies on the output flange and nut to clamp the rear bearing on the mainshaft. Dougal has a setup like you are suggesting and has reworked it: http://www.aulro.com/afvb/isuzu-land...ml#post2000130

Steve

Originally Posted by Vern

I mentioned this in post 23, had no takers though.
Dougal runs this on his box, no idea how he lubes it though. It does sound the easiest providing you can lube those splines. But if you break the shaft, transcase has to come off.

Why? Without an oil seal between the LT230 and the adapter case you should be able to pull it all out through the transfer case. And apart from your adapter shaft how many other shafts have broken, the axles see three times the torque and don't break (well most don't).

Originally Posted by steveG

The Isuzu box relies on the output flange and nut to clamp the rear bearing on the mainshaft. Dougal has a setup like you are suggesting and has reworked it: http://www.aulro.com/afvb/isuzu-land...ml#post2000130

Steve

Thanks for that steveG, just goes to show that I don't have an Isuzu gearbox. In that case I'd go with Ancient Mariners configuration, Dougal's looks like a lot of mucking around with the hollow splined shafts and fasteners.

I've read through all this a couple of times, but must be missing something.

Is there a perceived issue with AM's flange/shaft design that is trying to be solved?

Steve

Originally Posted by steveG

I've read through all this a couple of times, but must be missing something.

Is there a perceived issue with AM's flange/shaft design that is trying to be solved?

Steve

Not really. However i think the inner splines are unlubricated.

Originally Posted by steveG

I've read through all this a couple of times, but must be missing something.

Is there a perceived issue with AM's flange/shaft design that is trying to be solved?

Steve

I was only trying to reduce the need for the use of two flanges and 4 lots of nuts and bolts to hold them together and the amount of machining that has to be done to cut the extra pair of mating splines. Given what you pointed out with the link to Dougal's configuration (which I note also has a bearing at the LT230 interface) I would be happy to run with AM's configuration.

Hi all.. Not sure if its even relevant, but I noticed this thread for the first time this eve, and having adapted a truck gearbox to the LT230, I went about it a different way.. Having watched slim spud shafts fail, I thought I'd try the welded gear approach.. Yes the weld will be weaker than a solid one piece shaft, but, if its a larger diameter shaft it will withstand more torque.. I have welded the old output shaft flange (turned down to remove prop face) to the input gear of an LT230. Here it is pictured. There were a lot of doubters, but that was 15000kms ago and the engine and box that are in front of my LT230 is a 200hp 5.9 litre Cummins 6bt and ZF5-42 gearbox. The whole lot is in my 101 and has copped a flogging since day 1! A guy in the UK has taken on my plate design and welded gear setup and is now producing kits. One of the kit users is pumping 400hp thru that welded gear..... Just an option that might be usable in your application... Cheers.