toyota 4x4 automatics

BUILTnotBOT · Mar 16, 2012

buddy has a 85 4runner with a auto trans and dont know much about the strength and longevity of these transmissions.... Any body dealt with the A340's much?

I see the transfercase issue, but inchworm makes a kit for that, and also the interchange ability of these transmissions to run the aw4/231 or d300 setup. But overall Daily driving capability there isnt much out there about them...

any help is much appreciated.

skinny_pedal · Mar 16, 2012

There tuff. Behind a Toyota they rarely if ever fail. This is the same as an aw4, they work.

WHITE TRASH1 · Mar 16, 2012

The biggest weak link is the factory power robbing hydraulic pile of steaming **** transfer case. Keep it cool and it'll run forever.

Cave Dave · Mar 16, 2012

I love the auto in my 4Runner.Never had to do anything to it but change the fluid and that's with stock gears and 35 inch tires.

WHITE TRASH1 · Mar 16, 2012

Anal Goop said:
Well they got a little pump and cooler set up, ??

They Rob power ?

What sort of Whitetrash talk is this ??

There ya are talking out of school again. When you have first hand experience owning and driving stock and modified vehicles that we are discussing then you can join in. Until then go back to your "school of hard knocks" that has apparently taught you little.

The H in A340H stands for hydraulic. The t case is ran off of pressure from the trans pump. When the pump starts to fail or there is a pressure leak in the t case you lose high range but low range will still work. That added drag on the pump robs power.

Birdbrain · Mar 16, 2012

Reverse, snow, 4hi = KABOOM on your high range.

ask me how i know?

Now it has a 5speed, no issues, more power (lower gearing in the manual tranny) and its more fun to drive/wheel! plus i get better gas mileage, if your buddy DD's it, consider a 5speed swap. and it would solve say, dual case issues.

BUILTnotBOT · Mar 17, 2012

thanks for the all the info guys :beer: :beer:

been reading about these transmissions for awhile today and seem like most people really like em for the most part. Would anyone know what years the a340F (chain driven Tcase setups) started coming around? Ive seen mixed dates for these models

2DoorRunner · Mar 17, 2012

My buddy daily drove and wheeled his for almost 10 years i think. Never replaced it. He did mention that he never planned on getting anywhere fast.

WHITE TRASH1 · Mar 17, 2012

BUILTnotBOT said:
thanks for the all the info guys :beer: :beer:

been reading about these transmissions for awhile today and seem like most people really like em for the most part. Would anyone know what years the a340F (chain driven Tcase setups) started coming around? Ive seen mixed dates for these models

Most V6 rigs and some 4 cylinder rigs had them. The earlier trucks equipped with the F had a gear driven case. It is the unicorn of the Toyota world.