need help with my 80 auto A442F trans slipping (1 Viewer)

[yonny2k]

hi guys ive been having issues with my transmission, the symptoms are as follows
-reverse severe slippage (needs high rpm to start to engage
-not shifting into top gear until high rpm (basically putting foot almost down).
have already done a few days work on the trans trying to get it working but no hope. have been searching forums but can't seem to find any similar issues. the 80 has quite low milage for its age and what it is so I'm scratching my head on this one. any help is greatly appreciated, cheers.

what I have done so far
-replaced trans fluid 2xtimesn(checking fluid levels on dip stick constantly, fluid level ok),
-replaced trans filter
-checked used oil for fragments but all was ok although the oil was black and smelt burnt
-replaced all transmission solenoids

1996 landcruiser 80 series 218xxx KMS (135xxxmi)

 

[AussieHJCruza]

How are you checking the fluid level?

 

[yonny2k]

How are you checking the fluid level?

by slowly refilling ATF and checking dip slick as I go to not over/underfill

 

[AussieHJCruza]

by slowly refilling ATF and checking dip slick as I go to not over/underfill

Do you have the engine running and transmission shifted through all the gears before checking the level?

 

[yonny2k]

Do you have the engine running and transmission shifted through all the gears before checking the level?

yep I generally leave the engine running for about 5 minutes before placing foot on brake and running it from P to L and back up again

 

[voodu3]

Have you gone through the AT troubleshooting in the FSM? When it won’t shift do you get a flashing O/D light on the dash?

 

[Kernal]

Try to answer each of these questions:

Which transmission is in your 1996 FZJ80 (should be the A343F)?

Do you hear any grinding noises when in gear?

How did the symptoms first begin and when (miles/weeks/months) ie: did it start with different symptoms, did they change or get worse over time or?

Tell us how your 80 was used (rough off-road, getting stuck in mud/snow and rocking the vehicle to get out, etc) and what service, type of ATF, additives, etc had been done and who did them before the symptoms began?

If you've just done two drain and fills of the pan (3-4 quarts each time) you haven't replaced all the fluid (might not help anyways if there's severe wear/damage).

You could drain the fluid again in order to collect 3-4 ounces and send it off to BLACKSTONE Laboratories for a fluid analysis; that can give you some information about the condition of the ATF ie: high wear metals, water contamination, etc.

Black transmission fluid IME is almost unheard of in these transmissions but one cause might be if the friction discs inside have worn down to the metal (steel against steel). A quick test is to drain out the pan again then drop a strong neodymium magnet in the collection pan moving it around, let it sit overnight in a jar of the old fluid, then check the magnet for fine particles stuck to it. A formal transmission fluid analysis would of course give you more details.

TIP: do not over-tighten the transmission drain plug, that can cause the bung holding the threads to spin inside the pan, use a new crush washer every time you remove the drain plug.

Blackstone will send you collection bottles free, call them here:

Interesting Reports | Blackstone Laboratories

These are some of the interesting reports from gas and diesel engines, aircraft engines, transmissions, and more that we've done over the years.

www.blackstone-labs.com

Here's an example of a (Manual) Transmission fluid report (similar for a ATM):