What is this?!

[Jakescoots]

I am holding my foot steady, and I can feel when it drops down
http://www.youtube.com/watch?v=I_bZsE9RkSQ

[01gpgt01]

Looks like its going in and out of convertor lockup quickly

[97gtsc]

Can u hear the rpm change? If not then it might b in the cluster? or pcm doing it?

[TheOtherNick]

If you can fell the rpm change I would say it is the converter locking and unlocking, try a transmission serivce.

[matt5112]

Also perhaps scan.... your magical check engine light is on.

[Jakescoots]

The read only says o2 sensor

[matt5112]

and thats without turning the car off after driving it and it doing what it did in the video?

I'd have to agree with everyone else though, it looks like its in/out of lockup.

[blueguy]

Pan drop...filter change. Never hurts. Upgrade to Dexron VI while your in there

[matt5112]

Pan drop...filter change. Never hurts. Upgrade to Dexron VI while your in there

'parently synthetic dex III would be a better idea according to tep dave.

[TheOtherNick]

Yeah just run a synthetic dexIII compatible fuild.

[MBruneaux]

Try this

Pontiac Grand Prix Forums : Grandprix > W Body Tech > Transmissions > 1997 to current 4 speed Automatic (4T65E) (4T65E-HD) » ***FIXED*** TCC

[Jakescoots]

I will try that tomorrow

[trickytransam]

Pan drop...filter change. Never hurts. Upgrade to Dexron VI while your in there

Gotta be careful with Dexron VI. Alot of components required seal modulus changes to be compatable with Dex VI.
I'm not a trans guy, but I can tell you other products that use it had to make changes to accomodate it.

[matt5112]

apparently synthetic dex III is the best bet for vehicles that came with dex III.