VT Auto no Drive once warm

[Logz10]

Hi all. I have tried to find someone with the same problem on here and I don't know much about autos so bare with me. My wife was driving the car during the week. Stopped at the lights and waited a good 3 min before trying to take off again. She tells me the car just started to rev. She had to keep the car at about 5500 rpm for it to crawl off the road. She parked it there until I could get there after work. As it was dark by this stage I just jumped in and started to drive home. As i was driving home I could feel the rpms rise but i was going slower. I pulled over checked the fluid level. To dark so I walked to the local servo bought some oil, returned to car, chucked in the 1 litre and drove home. I had assumed the car was low on fluid but have checked it today and if anything its might be too high. (after I added a litre last night) I have allowed the car to warm up and again loose drive and reverse after 5 min. Car cools down and its back again. All gears change fine and its very smooth when cool.
Any ideas

[accentstencil]

It might just need a fluid and filter change. If it hasn't been changed in a long time the fluid could have deteriorated. Adding a bit of new fluid might have help a bit but not enough.

[sleepa]

Hmm, lost drive and reverse, I read about that being a common problem. I'd take it to an auto transmission place and they should be able to tell whats wrong. To me I'd say the gearbox is damaged, the bands could be stuffed. I know the first gears I lost were drive and reverse in one of my cars ages ago.

Has the gearbox heated up heaps?
What colour is the fluid (probably won't be able to tell as you put some new fluid in)

[wrx884]

Was at the misus old mans work shop the other day, he had the same problem with a ford telsta or wat eva they r. drove fine cold but as soon as it warmed up lost all gearing. turns out the box is stuffed so id assume the same thing here??

[REDNUT 80]

not sure but do you have the oil cooler built into the raidator? perhaps check your coolant for oil, i imagine if the radiator can suck the oil into it it could also push water into the box, and make it boil a lot faster?

[TheIceman]

maybe a cracked clutch housing inside tranny, cant remember exact name but it houses the clutches and attached to inputshaft is of bell shape design. these have tendancy to break/crack on V8's and give those symptoms. if it is, very costly to fix. it would have burnt the clutches as well.

[Tree cutter]

Sound like a job for a trans specialist. If it has got enough trans fluid and is slipping then you either have a faulty pump in the trans or a pretty bad internal leak. The trans fluid is thicker when cold so it will drive then but as it warms up and thins out it will bypass easier.

[seraphic06]

When was the last time the transmission was serviced? If it has been a while it is a good bet that the fluid is on its last legs. Make sure the fluid is it at the correct level. Get it serviced and hope for the best. It does sound like you will be up for a replacement transmission though.

[Logz10]

Yep, Autos knackered.
I'm looking for a changeover. Does a supercharged vt use the same box as the normal?

[moose man]

I know the first gears I lost were drive and reverse in one of my cars ages ago.

So, which gears did you lose next?

[9C1pack]

Yep, Autos knackered.
I'm looking for a changeover. Does a supercharged vt use the same box as the normal?

No they are different.
Check ebay, someone had brand new ones for $1800
Search for "COMMODORE VT VX V6 SUPERCHARGED AUTOMATIC TRANS NEW"