View Full Version : automatic tranny / full time 4x4 tcase

08-28-2004, 07:23 PM
I have a automatic tranny that has a full time 4 wheel drive tcase. Meaning the front and rear driveshafts can turn at different rates if need be. It is the auto 4x4 tranny out of a 85' 4Runner. I am curious as to how this is achieved. The tranny code is A340H. Is anyone familiar with this transmissoin and could shed any info about it? [b]

81' Toyota, 2.5L 22RE, Celica EFI retro'd in, 10" of lift, TSL 35x16 Boggers, 437 gears, Rear Detroit Locker, G52 Tranny, BULL BOLLZ!

08-28-2004, 07:59 PM
Holy cow where have you been haven't heard from you in while . sorry can't shed no light on your question.any ways just wanted to say hey.

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08-29-2004, 06:47 AM
the full time case uses a differential between the front and rear outputs,the same as is in the rear end to allow the two wheels to travel at differing speeds.i believe the one you have has a viscous coupler,which is essentially a fancy limited slip in it.

i dont need people to get me,i just need people to get out of my way

sj-x 500
08-29-2004, 06:56 AM
don't that mean that you could in theory have one wheel goin 4 times faster then your speedo?

like.. when you're stuck...

zuk: being prepared for total tear down. yota's 5.29's arb's.
ford: it drives.