1989 7M-GTE MA70 Supra Auto gearbox slipping badly

[mikeBrotherd]

My current auto has developed a bad slip in second gear which happened all in a matter of 1 days driving. I know its overfull with oil & has about 185,000Kms on the clock.

Im going to have a go at dropping a bit of oil out to the correct level to see if that helps, any other suggestions welcome.

Is it throw away material or is it common when its getting to the time where it needs a flush, oil change, etc...



Many thanks in advance...

[Dell'Orto]

When you say its overfull, are you checking it with the car running?

[mikeBrotherd]

There are two setting on the auto dipstick, one from when the box is cold & one for when the box is warmed up....never while it is running

But both hot of cold show it being way over the top

[Dell'Orto]

You're meant to check auto trans levels while its running

[mikeBrotherd]

dohh, man im such a dope haha!

Ill check it tonight and find out exactly where its at....




*bangs head* shut up Richard!

[deaf_rattle]

and i believe its supposed to be in drive when you do, so might pay to have a mate in the car

[Lloyd]

And no its not so ignore what deaf_rattle said

[deaf_rattle]

And no its not so ignore what deaf_rattle said

that was what the manual for my old holden said, i presumed all autos would be the same.

My understanding is because this filled up the torque convertor and thats when you want to know how much fluid was left in the trans.

[Zak]

All toyota's, and lexus for that matter are tested in park or neutral.

[mikeBrotherd]

All toyota's, and lexus for that matter are tested in park or neutral.

Im glad we cleared that one up, i could just imagine a monster V8 in drive jumping forward every time the motor surges!

[deaf_rattle]

All toyota's, and lexus for that matter are tested in park or neutral.

Im glad we cleared that one up, i could just imagine a monster V8 in drive jumping forward every time the motor surges!

you wont be testing it right then. but hey your car

i looked on the net last night, several sources said to test in drive, the other ones said to cycle through gears while foot on brake, then check(but thats probably just so you can check it on your own)

As mentioned this is to fill up the torque convertor.

But go ahead and do it half assed if you like

and whats this about motor surges? you got a bhg or something?

[deaf_rattle]

http://www.cygnusx1.net/Supra/Library/T ... ?S=AT&P=18

even mention in there about cycling through the gears..

but hey what do i know?

[spencer]

^ cycle through the gears all you want there aint going to be $&#$% all difference. Like the torque converters empty when your not in gear

[mikeBrotherd]

Ohhhhhhk, this isn't a cresh people.

I rang Pacific Toyota today and they said to do the following procedures,

Start and run the vehicle for about 15min to get the oil heated up so that the best possible reading could be made.

Check the oil level while the vehicle is running and see where it come between the hi and low levels, the optimal level would be half way between the two....

He also added as a side note that oil above the hi was a no good....was some Indian man i was talking to.

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=AT&P=18

even mention in there about cycling through the gears.. Wink

This is actually a damn good find, thanks.



So there we have it, the TOYOTA gods have spoken....

[Crimson Tears]

To accurately check the transmission oil level:

Vehicle must be on a level surface.
Start the engine.
Run through all the gears a couple of times.
Put the transmission in park.
The oil level should be between the two dots/notches on the 'cold' section when the vehicle is cold.
The oil level should be between the two dots/notches on the 'hot' section when the transmission is hot. If you have been doing a lot of high speed driving or towing, then wait around 30 minutes to allow the transmission fluid to cool, otherwise you may get an inaccurate reading.
Do not overfill or underfill the transmission.

This is the correct method for Toyota.

[mikeBrotherd]

Ok, i checked the oil level as best i could. When the transmission was cold it was reading well above the cold "Hi" level almost near the hot. So i took the car for a drive trying as best as possible not to let the gear slip but its nearly impossible to stop it from doing it at all. Went for a short drive just to get the engine and gearbox nice and warm.

Got back and rechecked the oil levels and found it was about 1cm above the hot "Hi" level, left the engine running again for longer just in case the gearbox was really hot and needed to settle and then rechecked but no change in level.

After this i decided i would drain a little bit of oil. To start with i probably only drained about 100mls if that. Dropped the car back to level, started it and let run for a bit, then rechecked. To my surprise the level was now sitting just below the hot "Hi" level, which is probably an ideal spot for it to be.

One thing i did note when i looked at the oil i had just drained was that it was a very dark brown and smells burnt....is this normal? I checked it for any metal shaving or anything out of the ordinary but couldn't see anything.

I took the car for one more road test to see if the gearbox was reacting any better. At first i thought it was worse because first gear seemed to be jolting me forward strange, but once the car was moving all the gears engaged better and held through acceleration/deceleration batter, with an all over better smoothness. Its still far from great as it takes a lot of light throttle work to keep second from slipping but not as bad as earlier.

But as for oil condition im not sure what to do from here.....

1.)Do i drain the gearbox from oil and top up with new oil, cross my fingers and hope that does it?

2.)Do i just say its $&#$% and start pulling it down to put another one in?

Do these things have an oil filter i could check or replace also??

[Dell'Orto]

No the trans oil is usually red, and although it smells pretty rancid, burnt isnt what I'd describe it as.
Just bite the bullet and take it to a trans specialist, they can flush the system for you and fit a new trans filter and it'll only be like $150 or so. Flushing it will get all the crap out that you just cant get out at home.

[blackmk3]

Supra autos are that cheap and nobody wants them, if its brown and smells burnt bin it mate, get a auto from a running car that somebody pulled to do a manual conversion

Dropping the gearbox is easy as, the hardest part is manovering the dam heavy gbox around

[supraTT]

Hi, i work for toyota and i have jusat converted my jza70 to manual after running into a similar problem, i have been told my auto suffered from burnt or slipping discs, otherwise my auto is fine (and shiftkitted). These autos can be very hard to find parts for but i have put mine on trademe, hopefully someone will want it for parts *sigh*