Thread: Newbie with Series IIA gearbox headache.

G'day rolr,

Thats mighty perculier are you sure its been in four wheel drive for the last two years I would have thought the wind up would have ither blown the T- case up or you would have broken the axles

Also the gearing is lower in 4 wheel drive than when in 2 wheel drive so it would rev its tits off and not go as fast as when u are in in 2 wheel drive.........so 80 in 4x4 & 90 in 2 wheel dont make any sence.

what sort of slaping noise is it??is it there all the time when in first or reverse does it go away when the clutch is in or when your rolling or when your driveing......


Tony

Maybe the rear brakes are dragging ? By that it would be easier for the drivetrain to turn 4 wheels than two dragging ones, hence the higher speed in high four. So have a bopeep by jacking up each wheel and spin to see if brakes are dragging. Adjust accordingly.

No change in ratio between high four and two wheel but the holden is never happy without overdrive at 100ks regardless. Though the holden is a blessing in the rough country, can usually drive along with feet off the pedals using the engine torque rather than revs and definately keep your left foot off the clutch.

Depends on where you are to driving in 4x4 all the time. Not good on pavement (reasons mentioned) but I can drive around the farm in 4by without drama. So long as diagonal opposite wheels can slip, tyre wear is about all that happens.

Gearbox trouble.... can't help you there. A suggestion would be take the floor out, lift off the selector fork cover plate and have a look. Might have teeth missing from the gears or too much float on the mainshaft.

I'm sorry to say this but it sounds as if you have a rear diff problem. I had a faulty rear diff in my IIA and acceleration and top speed in 2 wheel drive was attrocious but when in 4WD high range the old beast flew. This would be much more noticable with a tired 4 cylinder than a 6 as you have. Get the diff checked out. If, as you have been told, 4WD has never been used, then this could quite possibly be the case and the seller has only put it in 4WD for the sale to make it run better.

Terry

When you talk about crook rear diff.... what was the problem, carrier bearings ?

Jay
It turned out to be a loose pinion. I suspect the collapsable spacer in between the pinion bearings was collapsed more than usual, probably caused by trying to snatch pull immovable objects, felled trees, with a chain. This was in a Salisbury diff too. They (the writers of THE bible ) reccommend that the tension be very little and to do the nut up to the previous number of turns on reassembly after being disassembled, Ha Ha. I did it up to what I reckonned it should be and problem went away. Diff still a bit noisy, but no more than normal. Who can tell in an old 2A.
If gears are misalligned there can be quite an appreciable drag. and when 4WD is engaged the front axle pulling will straighten the drive as it were, and PULL or RELIEVE the drive off the rear axle, allowing the vehicle to run easier because the gears are not binding as much.
I just thought the rear diff being used ALL the time, the bearings could be worn out of allignment and cause the same problem.
The cost of repairs to a diff can be a good incentive to get rid of an older vehicle, but I have seen plenty of diffs, both L/rover and Salisbury for sale at reasonable prices, and I am sure even someone on this website knows of or has one for a reasomable price.
Regards
Terry[/b]

Hi
To test Terrys theory one could take the drive members off the rear axles,so the rear diff is free wheeling.
Andrew

Yeah I was thinking simple stuff, brakes being a usual suspect but you're probably right. [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]

Perhaps the solution could also be drop the diff out, stick it in the bench vice and do some measuring with prussian blue and feelers. I mentioned carriers thinking there might have been noise, slightly audible over the rest of the engine room. In my experience if if there is that much wear or slack something else normally gives squignals. That drive should be flopping around like a ....... in a sock in essence ...... "clunk clunk clunk clunk" as the vehicles driven and the oil seal would be leaking.... well more than usual.

Had a loose imput shaft on our pecan harvestor once, knew something wasn't right as the PTO shaft looked like spinning soft licorice, gearbox oil streaming out the oil seal but the dead give away was the thumpthumpthumpthump of the shaft pounding the bearings. Cost a bit in time but four new bearings, speedie sleeve and standard oil seal later good as it ever was. Just always figure mechanical stuff "talks" to you when there's a problem so I'm surprised there hasn't been a mention of noises. :?

Thanks all,

Yes there is a definate Clunk Clunk Clunk (it sounds like something moving forward and back on a spring slapping) when slowly moving off initially forward or reverse but it goes away after the clutch has been fully let out and yes oil every where from the front of the gear box, more than I was expecting. This was only occuring in 4x4 and has ceased now in 2x, I'll start simple and give the brakes and the diff a look this weekend as recommended to see what the go is there and the selector cover for the noise.

The first I knew it was left in 4x4 was when I took it out bush for a test drive shortly after buying it (having driven defenders over the last 15 or so years for work I didn't know about the 2x 4x bit), as I was about to go across a water obstacle I went to engage 4x4 as instructed (push down on yellow knob) and noticed it was already engaged but the hubs had not been locked, I had already driven about 150-200 km's at speed on a highway until this point. I crossed the obstacle and on the other side I disengaged it and when moving off again I noticed the clunking had gone away. I am suspecting the forward prop shaft area or something more sinister in the clutch.

Other than that the car is a beaut to drive and it takes hours to get the grin off my dial.

The Bloke I bought it off did not appear to know much about it, he drove it to work every day and that he bought it off a bloke in QLD who had done the conversion.

This advise should fill the next couple of weekends trying to identify the cause and thanks for the info it certainly narrows it down considerably.

Cheers.
ROLR