no drive in 2wd

[adamjamescook18 Lurker Find all posts View Profile Close adamjamescook18]

i have a 2000 manual rv6 and i initially had issues with loud short clunking noises approx 1 in 5 times of releasing clutch. i did some research and after a couple of checks i was sure that it was stuck in 4wd (light on dash went out normally). so i tried reversing and putting it in and out of 4wd and i heard the clunk again but this time i lost all drive in 2wd. in 4wd i have drive. when in 2wd i left it in gear and released the clutch but the engine didn't stall and the rear drive shaft wasn't spinning. the rear wheels have drive as normal in 4wd, any suggestions would be great

[croozza Avid PP Poster! Find all posts View Profile Close croozza]

Broken CV, by the way you dont have 2wd, it is a constant 4wd vehicle, with a broken CV all the power is going to that CV, until you lock the centre diff, then the power will do to the rear as well.

[adamjamescook18 Lurker Find all posts View Profile Close adamjamescook18]

thanks croozza, i really dont know alot about the vehical as i have only had it for 2 months. so now that i know that it is in constant 4wd, what is the difference between hh and hl or would u have a link that explains this

[williade Avid PP Poster! Find all posts View Profile Close williade]

Being constant 4WD there are 3 differentials. 1 in each axle and 1 in the transfer case (centre diff) to split the torque evenly between the front and rear. When you are in HL the centre diff is locked and is effectively the same as 4H in a part-time 4WD.

On a side note, where do people get "HH" from? I have only ever seen H, HL and LL.

[adamjamescook18 Lurker Find all posts View Profile Close adamjamescook18]

sorry yes just 1 H, i checked the cv joints and there is alot of movement in the drivers side. i guess this is where the problem is but i cant understand why the rear wheels and the passenger side front lose drive until i lock the centre diff

[Seththecursed Member Find all posts View Profile Close Seththecursed]

Being constant 4WD there are 3 differentials. 1 in each axle and 1 in the transfer case (centre diff) to split the torque evenly between the front and rear. When you are in HL the centre diff is locked and is effectively the same as 4H in a part-time 4WD.

On a side note, where do people get "HH" from? I have only ever seen H, HL and LL.

This maybe...

http://www.pradopoint.com/showthread...-part-time-4wd

[adamjamescook18 Lurker Find all posts View Profile Close adamjamescook18]

ive just figured that because of the center diff, it will choose to drive the front because the broken cv gives it the easiest distribution and this as well happens to the front diff as it sends the power to the broken side. considering this is correct, i should assume that the front drive shaft would be spinning when i have it in 'H' and in gear. but it isnt

[williade Avid PP Poster! Find all posts View Profile Close williade]

This maybe...

http://www.pradopoint.com/showthread...-part-time-4wd

He's another offender. It reminds of people who think HL is "high-low" and LL "low-low".

[glen_ep Addicted PP Member Find all posts View Profile Close glen_ep]

ive just figured that because of the center diff, it will choose to drive the front because the broken cv gives it the easiest distribution and this as well happens to the front diff as it sends the power to the broken side. considering this is correct, i should assume that the front drive shaft would be spinning when i have it in 'H' and in gear. but it isnt

Yes, at least one of the driveshafts should spin whilst in "H". If neither of them are spinning, it indicates a failed transfer (gearbox). Have you been driving on tar road in HL?

Try this:
Engage HL (ensure transfer lock light appears). Turn off the engine, securly chock both passenger side wheels, and lift both driver side wheels into the air. (lifting the axles will be quicker than lifting the chassis).

Test 1: Set the manual gearbox to neutral, release handbrake, and rotate the driver side wheels one at a time - in HL, they should rotate together at equal speed. Take note of the driveshaft movements.

Test 2: Engage 1st gear (with the handbrake still disengaged, and the engine still off), and try to rotate a driver side wheel. It shouldn't be possible to rotate either of them. Again, take note of drive shaft movements during this test.

These tests could also be performed with the engine running, and carefully using idle RPM power to drive the wheels (instead of your hands), but extreme care must be taken! (and you'll need a friend to watch the driveshafts) *EDIT: Actually, this is a slightly different test, but both wheels should spin whilst in gear.

[Derb Senior Member Find all posts View Profile Close Derb]

Hi Fellas. I would have thought that with LSD diffs, regardless of a broken CV joint, some load would have been transferred to the other three wheels and the vehicle would have moved whilst transfer box in normal position. I know that the 4WD fraternity bag the Toyota LSD's mercylessly but they can't surely be that bad. My 2 bobs worth. Cheers.

[williade Avid PP Poster! Find all posts View Profile Close williade]

Only the rear is an LSD. With the centre being an open diff all the drive would go the front with a broken CV.

[glen_ep Addicted PP Member Find all posts View Profile Close glen_ep]

Yup LSD is only in rear, but it's weak enough that lifting one rear wheel in the air (whilst in normal H position), will result in that single wheel spinning. I"ll go and test my theories now to ensure I'm not spittin bull..

[glen_ep Addicted PP Member Find all posts View Profile Close glen_ep]

Confirmed:

H/neutral, both rear wheels in air = can easily spin one wheel by hand, and the other spins in the same direction = LSD locked up. [Rear driveshaft rotates]

H/neutral, only one rear wheel in the air = can easily spin one by hand, no other wheels spin = LSD let go. [Rear driveshaft rotates]

H/neutral, both driver side wheels in the air = can easily spin one wheel, the other does not [one driveshaft rotates, depending on which wheel you spin]. Also, careully using engine power in gear, only the rear wheel spins (as slight brake preasure is preventing the front). Engage handbrake, retest with engine power, only the front spins. With the right amount of hand/brake preasure, both can spin [and both driveshafts rotate]

H1/neutral, both driver side wheels in the air = can spin one wheel with some effort, the other wheel spins exactly the same [both driveshafts rotate]. Carefully using engine power in gear, both spin exactly the same [and driveshafts]

[williade Avid PP Poster! Find all posts View Profile Close williade]

I have found that with both rear wheels in air, the front wheels chocked and the transmission in Park, the LSD provides a terrific amount of resistance when trying to spin 1 wheel. In theory the wheels should turn in opposite directions.

But maybe the friction packs my rear diff aren't as worn as yours Glen.

[adamjamescook18 Lurker Find all posts View Profile Close adamjamescook18]

i have removed the front drive shaft so i can still get from a to b in HL, im thinking that my problems could be deeper then just cv joint. out of curiosity i had it in H and stated to turn the drive shaft mount on the transfer case. it was very easy to spin and made a grinding noise. i then put it in gear with the engine running and nothing changed. i thought the mount would be spinning but no. now i put it in HL and i thought it would have been locked in but was still the same, easy to spin and made grinding noise