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The mkiv Supra Owners Club

Auto gear box problem maybe


Paul372

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Hi,

I’ve got a slight problem with auto box or torque converter on my tt auto, can anyone advise and help me diagnose what it could be. I’ve got no noises coming for the gearbox and it drives fine driving around normal but when I nail It, it doesn’t hook up just slips and revs right out like a clutch slipping on a manual car. I’ve changed the fluid as it was a bit on the brown side, there was no metal bits in the oil, took it for a test drive and it was still doing it, so I decided to change the filter and do a full oil flush and it’s still the same. Do you think it’s the torque converter needs changing or could it be the gearbox has had it 😬

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Yeah done all that, as soon as it first started to slip I changed the fluid, must of done it 2/3 times as I knew something wasn’t right. Test drove it and it did it again 2/3 times so I thought of changing the filter and again test drove it and still doing it. So im trying to figure out if it’s torque converter or gear box and what change next from here. 
 

My Supra is a jap spec tt, but I have a spare gear box but it’s from a uk spec car are they the same or different, can I use a uk spec box in a jap spec and will a jap spec torque converter fit a uk spec box?

 

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I previously had an issue similar to what you describe, mine would slip and free rev or fully engage, there didn't seem to be a progression in-between. It was a very short time between that first event and full failure for me. My fluid levels were correct but I was abusing it fairly heavily over a couple of years. I changed the clutch pack in the gearbox to resolve.

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  • 4 weeks later...

Turned out to be the clutch packs in the gearbox slipping it just got worse and happening more often so i swapped the box over and changed the torque converter to a 3200 high stall all sorted now. The sup hooks up a lot quicker, so now seems more responsive, wish I knew high stall would make such a difference in a auto well worth doing 

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