Rear wheel spinning in 2WD

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Roon1973

Member
Posts
15
Location
kent
Hi All,
on my '77 series 3 in 2 wheel drive in reverse on wet grass etc (nothing too taxing) one of the rear wheels spins (drivers side RHD) and i don't get a lot of traction . 2 and 4 wheel drive (as in the selection) works fine..is this normal ? or do i need to jack it up and get dirty !!!!
 
Roon1973 said:
Hi All,
on my '77 series 3 in 2 wheel drive in reverse on wet grass etc (nothing too taxing) one of the rear wheels spins (drivers side RHD) and i don't get a lot of traction . 2 and 4 wheel drive (as in the selection) works fine..is this normal ? or do i need to jack it up and get dirty !!!!
Click to expand...
its normal there no locking device in the axle diffs,so in 2wd 1 rear wheel can spin if tractions lost and in 4wd 1 front and 1 rear can spin leaving you stood still
 
jamesmartin said:
its normal there no locking device in the axle diffs,so in 2wd 1 rear wheel can spin if tractions lost and in 4wd 1 front and 1 rear can spin leaving you stood still
Click to expand...
Yep, really a 4wd is usually only 2 wd unless there are diff locks, then you are 3wd.
It really is miss leading the term 4wd
 
Wet grass has been the downfall of many. It's not far behind ice in the gripping stakes.:)
 
Sometimes, poorly fitting brake shoes jam or bind when the wheel is rotated backwards. If the LH rear was like that it push drive to the other wheel. Possibly just a binding brake in general?
 
Thor 1950 said:
Yep, really a 4wd is usually only 2 wd unless there are diff locks, then you are 3wd.
It really is miss leading the term 4wd
Click to expand...

Not really- an open diff splits torque equally, so each rear wheel gets 50% of the torque in 2wd. Trouble is, torque on all wheels is then limited to the wheel with the least traction.
On a Defender with the center diff open, each wheel gets 25% of the torque. It's still 4wd as all four wheels are driven.
 
FlyingPete said:
Not really- an open diff splits torque equally, so each rear wheel gets 50% of the torque in 2wd. Trouble is, torque on all wheels is then limited to the wheel with the least traction.
On a Defender with the center diff open, each wheel gets 25% of the torque. It's still 4wd as all four wheels are driven.
Click to expand...
BS if they are.
 
FlyingPete said:
Not really- an open diff splits torque equally, so each rear wheel gets 50% of the torque in 2wd. Trouble is, torque on all wheels is then limited to the wheel with the least traction.
On a Defender with the center diff open, each wheel gets 25% of the torque. It's still 4wd as all four wheels are driven.
Click to expand...

That's wrong.

All the wheels only get 25% of the torque, if all wheels have equal traction. If any wheel looses grip, and the centre isn't locked, then the wheel with the least grip will spin helplessly.
 
Nodge68 said:
That's wrong.

All the wheels only get 25% of the torque, if all wheels have equal traction. If any wheel looses grip, and the centre isn't locked, then the wheel with the least grip will spin helplessly.
Click to expand...

And because that wheel can't take any torque, none of the others get any either and the vehicle is stuck. You can measure this experimentally (play with some lego technic) and you will always see equal torque at both shafts. Physics.
 
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