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4+3 Transmission I have confirmed all of the electricals and computer systems are good. That leaves me with the OD unit itself. It was only slightly low on fluid, but did have a faint burned odor. I am thinking in need to find a Corvette Specialist to look at the unit itself.

Larry, So low fluid in the OD unit will cause it not to engage?

Previously when in OD I was at about 70 mpg at 2000 rpm; now I am closer to 2800 rpm. So it appears that I am still in 4th without the OD engaging; plus the "up arrow" on the dash is still illuminated. I know this is very basic; but I have not worked on cars since I was a kid in the original...

CorvetteOz - So would start by taking apart the shift nob and examine/replace the switch and then work your way thru the firewall and then to the OD unit itself? Since the car is 23 years old, once I take it apart, it doesn't seem to make sense to but a 23 year old part back in place when for 5...

4+3 Tranny Issue VetteOZ - thanks for the info. Great place to start. I'll begin that this weekend.

I purchased my first Corvette three weeks ago; 1986 Yellow Convertible! Great Looking car. Over the last two weeks, the OD Icon has been lit on the dash, the arrow illuminates telling me to shift, but the tranny will not shift into OD. First concern, is this harmful to the engine, is this a...