Author Topic: Auto trans 4wd slipping  (Read 2185 times)

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Bigshrugs

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Auto trans 4wd slipping
« on: Feb 27, 2018, 08:59:25 AM »
Truck is a 87 SR5 TURBO 4runner automatic. I believe the trans is a a340h. Having issues with 4wd.while in 4wd (high and low) and climbing the rear wheels spin only. Front driveshaft kinda twitches like it wants to move but doesn't.  Jack the truck up off the ground and all 4 will spin. I've verified front drive shaft, differential and manual hubs are all in good working condition. And 4wd light does come on.

joeyf

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Re: Auto trans 4wd slipping
« Reply #1 on: Feb 27, 2018, 12:31:26 PM »
Where you able to stop the front drive shaft by hand when all four tires where off the ground.

Bigshrugs [OP]

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Re: Auto trans 4wd slipping
« Reply #2 on: Feb 27, 2018, 01:10:02 PM »
I tried stopping the wheels while in the air and could not. Front has locker.

joeyf

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Re: Auto trans 4wd slipping
« Reply #3 on: Feb 27, 2018, 01:44:01 PM »
I ran into the same problem a few years ago, nothing while it was on the ground and couldn’t stop it in the air. The locker was pushing it self apart hard enough to still work with the tires in the air. Not until I finally pulled the diff that I could see what went wrong. It’s the old style detroit.


Bigshrugs [OP]

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Re: Auto trans 4wd slipping
« Reply #4 on: Feb 27, 2018, 02:54:37 PM »
Hmm. Just put a brand new Yukon in the front. Don't think that's it though. Think it's a tcase problem while in 4wd I can dig the rear tires in and the front drive shaft just twitches And will not turn.

redneckcustoms13

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Re: Auto trans 4wd slipping
« Reply #5 on: Feb 27, 2018, 08:07:47 PM »
Have you been in the t case lately? It would be very strange that the shift collar for 4wd be damaged but I suppose it could be possible.
83 long bed 2wd sas, 3rz, w56, duals with 4.7 rear, 4.88 elock front, spartan rear, 39.5 iroks
01 double cab hunting truck
06 tacoma street truck

Bigshrugs [OP]

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Re: Auto trans 4wd slipping
« Reply #6 on: Feb 27, 2018, 08:46:34 PM »
No other than changing fluid I haven't touched it. Don't know a whole lot about them hoping for a easy fix

R.DesJardin

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Re: Auto trans 4wd slipping
« Reply #7 on: Mar 03, 2018, 06:46:45 AM »
The  A340H stock t-case is a disaster waiting to happen. The H model t-case is hydraulic actuated everything. It is just possible the clutches are just wore out. I tore one apart once, years ago but never messed with driving one. Plenty of fluid?
R.DesJardin
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redneckcustoms13

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Re: Auto trans 4wd slipping
« Reply #8 on: Mar 03, 2018, 06:51:12 AM »
Is there another case he could easily swap in place do that one?
83 long bed 2wd sas, 3rz, w56, duals with 4.7 rear, 4.88 elock front, spartan rear, 39.5 iroks
01 double cab hunting truck
06 tacoma street truck

 
 
 
 
 

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