Auto Tranny Slipping

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Date: Thu, 05 Mar 1998 17:28:54 -0800
From: Jim Brink 
Subject: Auto Tranny Slipping Question
To: "Dupree, Robert A." 

Dupree, Robert A. wrote:
> 
>         After the new engine I have noticed a problem with the tranny
> not engaging properly into gear.  During the re-assembly while
> tightening the fly-wheel bolts to the torque converter I heard a fairly
> loud thunk.  I can attribute the noise to the front of the torque
> converter smacking up against the fly wheel, so I thought nothing of it
> at the time.

Hmm. Sounds like the torque converter wasn't indexed properly into the
front pump housing upon reassembly. You may not have removed it, but
there is a slim chance it could have backed out when you pulled the
motor.

>         Now I am wondering if I have missed something, or worse broken
> something.  The torque converter (TC) was never taken out of the tranny,
> but I am wondering if bolts connecting the front of the TC to the fly
> wheel are also supposed to connect into the back of the TC.  I am
> unfamiliar with how TC work, look or any of that.  I have checked the
> bolts for tightness, and there is of course fluid in the tranny, correct
> amount of DEXRON III.

>         The problem is worse when it is cold, but even after warm up the
> tranny drops out of gear when at a stop sign, and then re-engages when
> the RPMS hit 1000.

This is symptomatic of a torque converter leaking fluid back into the
pan. Check the fluid when the engine/trans. is cold. It should be higher
than the cold mark but if it is really far up the dipstick, you have
either a faulty pump and/or torque converter. If all of the fluid from
the converter drains back into the pan, it will take a while to pump
through the system upon restarting. Same goes for when it freewheels at
stop signs.

A good trans. shop should be able to diagnose the problem without a
teardown.

- -- 

Jim Brink, Toyota/ASE Certified Technician	1986 Toyota Std. Bed 4WD
Manhattan Beach, CA				32x11.50/15 BFG M/Ts
ToyTech@Off-Road.com
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