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Hi demonicwillow,
I seem to have had a similar problem with the all wheel power transmission to the rear wheels, my ladies is an 96 850 with 142 kWatts( 193 HP. The front wheels used to skidd, when driving up a steep hill on slippery surface, this I found abnormal. Neil from this post mailed me some pdf files to get an overview over the arrangement of parts, function and test.In my case, the given torque 50Nm was reached, so it seems ok, in the meantime in the lots of snow we had, the awd has proven to work.
On last Saturday I bought a V70 AWD 2/97, same engine. when checking before the buy, I had it jacked up on a 2post jack with all four wheels in the air.
On the 850, high up, all the wheels would turn at the same speed, whereas here nothing happend to the rear.
The function is as follows:
From the Main Gearbox in the front the so called angle gear or bevel gear is driven and transmitts the torque at same rates to the right front and the rear central shaft. All the time, no matter, if visco coupling (VC) is engaged or not.
At the end of this shaft, sits the VC, directly on the rear axle with differential.
In the VC there are some discs joined to the incoming shaft and others to the outgoing. Is there a difference in revs between these two, the VC jams and so the power is transmitted to the rear.
My advice to You:
get Your car jacked up at some garage, start the engine and carefully engage in 1st gear. DO NOT ACCELARATE A LOT , otherwise You'll ruin Your gearbox!!
at idling revs all four wheels should turn.
If this does not happen: does the shaft turn? Y,Then there should be a difference in revs between shaft going in VC to VCbody. This means that the VC has a fault, check manually.
No turning shaft, angle gear broken, check VC manually:
turn engine off, turn rear wheel by hand an get a second person to try to hold
it fixed. if there is some strong power feeling, the VC works.
On 850s and V70s the angle gear is the most sensitive part to worn tyres, one-side worn tyres,unequal tire sizes, etc, because unequal tyres have different rotation speed, these different speeds join in the angle gear box, which is actually not to happen and the cock-wheels receive enourmous stress, at some rate they give in. About the interior of such an angle gear, I'll be able to report, once I have changed mine.
best wishes, good luck,
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