Front and rear wheels not spinning at the same speed?

[threedogs]

You need to select high 2WD, if its in H4 you'll have a hell of a time steering it.
and very noticable, select auto on the hubs as well

[my third 256]

do you have diff lockers

[heaths_gu]

I think we're both from bathurst. If you need a hand let me know.

Cheers
Heath

[Nightjar]

You can count the teeth on the crown wheel, but you have to open up the diffs.

I think the easiest way would be to jack the truck up off the ground, lock the hubs, whack it in 4wd, mark the front and back wheels at the top or bottom, and then spin the tailshaft to see if the front and back wheels rotate to the same spot once the wheels have done a full rotation

Thumbs up to this advice.

[Covo71]

Hi mate, old gear box seized up and stuck in gear.
Had the troll 18 mths.
Most driving off road is dry and rocky. Live at bathurst.
Manual hubs changed over 12 mths ago to avm.
No front locker that I am aware of. If auto I am sure it would be clicking or clunking around corners.

[the evil twin]

Hi mate, old gear box seized up and stuck in gear.
Had the troll 18 mths.
Most driving off road is dry and rocky. Live at bathurst.
Manual hubs changed over 12 mths ago to avm.
No front locker that I am aware of. If auto I am sure it would be clicking or clunking around corners.

Hmmm, curiouser and curiouser

If the old gearbox siezed is it possible a diff is damaged as well?
What trashed the gearbox, water?
If you have had it 18 months and driven off road in rocky terrain then the tryes would be howling their guts out all the time it is in 4WD.
I would be amazed it hasn't blown a CV or FWH's over that amount of time as well if there are indeed different ratio diffs in the vehicle.

Going to be interesting to hear what is wrong when you figure it out.

[Covo71]

Ok, just put it up on stands. 4wd high, front hubs locked. 1 turn of the back wheel and the front wheel turns about 1.3 turns. Might be a problem but would explain why it is such a pig in 4wd. Will need to take off the diff covers and count the splines. Maybe they stuffed a diff at some stage as well and replaced it with the wrong ratio.
Got the missus to turn the wheel and i got under to count the drive shaft. rear wheel 1 turn is about 4.3. sounds ok. i turn of the front is only 2 turns of the drive shaft.

[the evil twin]

Unless you can lock both other wheels you need to turn the drive shaft not the wheel for a definitive result... but that is an awesomely big difference around 25 to 30%.
Even 3.9 to 4.6 isn't that much
It would buck like a Bronco in 4WD I would have thought

Replacing the diff was what I was getting at when I asked about the Gearbox.
So someone else replaced the gear and sold it to you?

[heaths_gu]

it should be pretty easy to determine which diff ratio is wrong by the revs to speed in 2wd. (not that i can remember what mine revs at @100 in 5th) Odds are it will be the front diff ratio that's wrong, but unfortunately it's a lot harder to change the front centre than the rear.

[happygu]

Unless you can lock both other wheels you need to turn the drive shaft not the wheel for a definitive result... but that is an awesomely big difference around 25 to 30%.
It would buck like a Bronco in 4WD I would have thought

Replacing the diff was what I was getting at when I asked about the Gearbox.
So someone else replaced the gear and sold it to you?

As ET said, you cant get a total definitive answer by turning the wheel, as you could get slippage through the open rear diff. Turning the tailshaft is better ..... the first assessment seems ok 1 turn at the rear - 1.3 at the front, which indicates that there could be a problem.

You second assessment of 4.3 turns of the tailshaft against 2 turns on the front seems to be a fair bit off, and dont think can be trusted to be a definitive answer.

Mic