Gearbox problem

I have a series IIA
Runs OK in firsr and second gears, whan I change up to 3rd / 4th gears it whines really loud. Sounds more like I changed down a gear rather than up! Does not accelerate as you would expect.
Seems strange - any ideas?
Thanks
Steve

hae you got it in low?

Do you have an overdrive? (4th lever, coming out of the side of the transmission tunnel nearest the seat box). Is it still engaged? That would make a different noise and affect acceleration.

Low ratio is not selected, although it sounds as though it is!

It does not have overdrive.

On inspection there is a shaft, about inch diamater that protrudes from back of gearbox a couple of inches.
I can push it back in with ease, I am no expert but I doubt if that should happen.
Is this a clue?
Steve

this is on the transfer box right? just above where the propshaft fits.if it is thats the shaft that governs whether you have selected high or low ratio.looks to me as if your linkage is broken and you may well be stuck in low.

Actually I was thinking that sounds like the intermediate gear shaft. There should be a bolt on tab that fits into a groove on the end of that shaft and stop is coming out of the box.

Andy66,
I think you may be on to something there. There is a slot at the end of the shaft but no tab to secure it.
If I push the shaft in and fix a securing tab do you think it will be OK or will damage have been done whilst it has been loose?
Cheers,
Steve

I suspect damage will have been done.

The gear that runs on this shaft has caged roller bearings inside it that may well be breaking up or have broken up. There are also thrust washer between the gear and the transfer box casing.

Your best bet is to drain the transfer box and remove the bottom cover, about a dozen bolts. Be warned that there is a cork gasket behind the cover and it is easily damaged so expect to have to replace that. Anyway, once 'inside' you should be able to see and inspect the damage......actually you will get a pretty good idea from what comes out in the oil

Thanks Andy,
Sounds ominous!
I better be on the look out for a replacement gearbox.
Steve

Any one out there with a suitable gearbox in good working order they want off load?
Cheers,
Steve

Where are you based? PM me if you like.

Hi,
I am in West Yorkshire
Steve

Might be worth a look in tranfer case as Andy suggests, particlarly if shaft pushes in easily as it shows its still alingned correctly.

once bottom comes off and shaft pulled out you can inspect all the bits for wear

trhe pics show the little plate keeping shaft in (bolt removed)

and the intermediate shaft in the middle

Thanks,
Unfortunately it looks like the gearbox will have to come out.
Is it possible to do this without ripping the inside out and taking it out the door?

Steve

Transfer box is rebuildable in situ, unless casing has been damaged by floating gears.

Gearbox has to up and out of the passenger door if you do not have removeable gearbox crossmember on the chassis. It will be a bolt in affair. If you are handy with a welder then this is the ideal oppotunity to make this 'adjustment'

Otherwise, removing the passenger door completely can give you just that little bit more room.

HTH

Thanks Andy,

I think I will be quicker cutting out the crossmember.

Will a 1981 series three gearbox be compatible as a swap out, I think the engine is already a series 3 but dont know age.

Cheers,
Steve

The S3 box clutch slave is in a different place (opposite side), so clutch release and actual clutch are different. If you get all those bit with the box and you can make a new pipe to from clutch master to slave (I don't think the old one will reach) then yes, pretty much a straight 'nut and bolt' swap.

Thanks Andy