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Subaru Forester Tranny Problem
Have you checked for play in the universals and rear end? A lot of the old trucks we used in the woods would have worn rear ends and then near new front ends, as you seldom turned them in. If you placed them in 4 wheel they would bang and hop down the road. It could just be taking out the slack in the drive train as it engages. I would roll underneath and wiggle the drive shafts to determine how much slack is there.
Second, I don't really know this system. My Uncle's Forester is AWD and manual. If it is an electric clutch like the overdrive systems on the Volvo's, Triumphs etc then it is like you drop the clutch with a bang if you do not retard the accelerator. Some of the GM products use this sensing technology and only engage the rears or front electrically or hydraulically when needed. If the rear engages with the front spinning then you may very well get a bang as the clutch pulls the other set of wheels in.
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Subaru Forester Tranny Problem
They advertise these systems as "seamless" and "you never know it is engaging". Not having owned one I can not say how they should work. I thought all the Subaru were now all wheel drive. I rented an Outback in South Dakota one snowy night and I know it was.
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Subaru Forester Tranny Problem
Art is it a viscous coupling system or a continuously variable system like the newer transmissions. My only experience with owning a AWD was an old Jeep full size Cherokee,74. It used an expensive system like the Range Rovers which is a linked chain that moves like the newer continuously variable transmissions from what I know. For the era the system was quite economical as with a 360 ci I got about 16 mpg.
What I read there are 2 different systems on the Subaru.
Active AWD: Subaru's automatic transmission use Active AWD, mostly front wheel drive and uses traction sensing computer input to electronically vary the front to rear power split via a hydraulic multi-plate transfer clutch.
and
VTD AWD (variable torque distribution). New in 2001, VTD transfers powers front to back electronically. The power split is 45/55 front/rear and the rear wheel bias is designed for a more luxury car feel as opposed to the front bias of the Active AWD system. Usually 45/55 front to back split but that varies according to wheel slippage.
My guess is the system in this Forester is the first one an there is slack in the drive train or mechanical or electronic problem with the rate of engagement. Did you check is there were any recalls on this model? It might be as simple as reflashing the control memory. I found a site once that you placed model numbers and VIN in and told you all the recalls on the vehicle. I will see if I can find it again.
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Subaru Forester Tranny Problem
My Cherokee was one of the first Quadra tracs. It had the GM TH400 transmission and the sturdy alumium chain driven transfer case. It had rare front are rear ends, I am not sure if they were limited slips or what. The thing would go anywhere. I had it walking on glare ice and steep hills a couple of times.
The one Subaru system is essentually the old locked tranfer case with the computer locking up the clutch when needed.
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