I'm having some issues with my recently acquired 1994 NJ 3.0 (6G72) Paj's auto transmission. By way of background, i've given it the mother of all services, so mechanically it's in excellent shape except for the tranny.....
Ordinarily the car performs very well. From time to time however I'll be in 'drive' and driving along at suburban speeds (40-60 kph) and push the accellerator and find the engine RPM increases, but the car's road speed does not, ie, the transmission feels as though it's slipping.
Accellerating harder will provide a little bit of 'driving force', however 'slipping' is the best way of describing what's happening, as I look for somewhere safe to pull over.
From the side of the road I can select reverse (which engages immediately it's selected), however when I select 'drive' again, there is no feeling of drive 'engaging', however if I then push/feather the accellerator a little, the transmission does eventually start to provide some weak 'driving force', with some continued slip, then after a few more seconds it seems to engage and normal drive seems to return. At this point I can even accellerate away with full power and there is no longer any slip evident at all!???!
After the first time this happened, I resolved to service and safely flush the transmission by a very very reputable transmission shop (I've known these guys for 10 years). These symptoms did not return for these guys, and they didn't return for several days, however as I was returning home from work this evening, the symptoms as described above returned.
There is plenty of spotlessly clean, rose colored oil in the tranny (first thing I checked.... yes... with the motor running), and the service guys said that while the old oil was dark, there was no metalic residue in the pan.
Yes it seems worse when the car is hot, and these symptoms have never occurred when the engine is cold. The engine's thermostat is a brand new aftermarket unit, and the guage always sits exactly on the half way mark.
Also, there are no nasty noises coming from the tranny, however when the engine is at operating temperature and I select 'drive', there is always a very slight delay before it engages (I know this is not ideal).
So.... please guys, feel my pain, and those of your with experience / knowledge in this area I'd very much appreciate it if you can shed some light on this...