Whining or whistling is typical of the front pump sucking up air instead of fluid. The pitch will increase with an increase in engine speed. Was the engine running when you checked the fluid level?
There are some mechanical things that can cause no or sluggish reverse, but they shouldn't be related to temperature. One simple thing to not overlook is the kick-down cable. The diagnostic charts make repeated reference to its adjustment but in the '90s, there was a lot of trouble caused by that cable sticking. It usually caused delayed up-shifts and early downshifts but check it for free movement anyway.
I would disregard code 783 for now. It could be set as a result not shifting properly due to low governor pressure. Your transmission doesn't use shift solenoids and a Transmission Computer like the front-wheel-drive cars and minivans. The torque converter lockup clutch is controlled by the Engine Computer just like they did since the mid '80s. What is different though is the governor valve is computer-controlled instead of mechanically-controlled on the tail shaft. That's how they can detect fault codes related to that circuit. Codes 1757 and 1764 both refer to the voltage being too low. Given that, you might suspect a problem with the governor solenoid or pressure sensor. Start by checking the pins in the electrical connector. There's also a transmission control relay. Just to be safe, swap it with a different one like it.
Saturday, January 22nd, 2011 AT 12:38 AM