Like the title says, it's whining in all five forward gears. I thought it was the rear end, but when I got my son to listen to it while we sat it up on jack stands, it's definately coming from the tranny. The pitch stays pretty constant with road speed (loudest between 25 to 50 mph) no matter what gear it's in. It's the original tranny with over 250,000 miles, it's my daily driver and I'm hoping I can save the trans until I'm ready to upgrade to more power and a stronger transmission in the future. I've done several searches but very few mention whining in all 5 speeds. I'm thinking output / tailshaft bearings / bushing, something that spins at a constant rate with the drive shaft. I checked the fluid and it's all good. Any ideas out there as to what it could be ?