Quote Originally Posted by BillBoost37 View Post
It might be third. Let's say you have a ton of KR and a flashing check engine light etc that you didn't mention. Car can't make the power and if you are in third at 90ish.. the kr etc is probably holding things back.

Something as simple as a dirty MAF, bad TPS can mess with shifts badly. Also KR etc can.

Fuel mileage..your testing wide open runs with no maintenance and saying mileage is bad? Not saying this to be mean, but to open your eyes as to what I'm reading into when you say that.
This is where I was going. If you have a brand new-to-you car with higher miles and take it out to beat on it and see how fast it will go, but something isn't right, maybe you should consider doing some maintenance on it first.

I obviously would change the tranny fluid and filter. But things like plugs and wires can also do like Bill said and not allow the car enough power to shift.

But bottom line I think, if you are going to run your car hard, high RPMs and high MPH, you need to make sure it is in good mechanical condition and the maintenance is up to date. Otherwise, if it doesn't run right, you are just taking a shot in the dark of what it is.