1988 Ford Bronco No 4th Gear = NO GAS

Transmission problem
1988 Ford Bronco V8 Four Wheel Drive Automatic 200K miles

I Have a 88 Bronco XLT 5.8 351windsor. It shifts very good through 1, 2, 3 gears as far as I can tell.
EDIT: (DAMN, I answered my own question with this one, the c6 transmission IF it is the one I have only had 3 forward gears + reverse.)

So, let move on to HOW to save gas.

Also only getting 6-8mpg could this possibly be the reason? I am sure my EGR valve is shot and I currently have the wrong PCV installed if that could effect gas mileage as well ;) When I had it titled they said it had recently failed emissions. Judging from the exhaust tips, im guessing its running ridiculously rich. When floored, dumps a bit of black smoke (better than white smoke) :) also doesnt ROAR like you would think it should when floored, like its being flooded or vice versa with fuel.

But overall, the engine is very strong (throttle response is a bit slow) and the transmission seems to function awesome.

Any possible gas saving suggestion suggestions and could the bad EGR valve and wrong PCV hamper gas mileage?