HOW LOW CAN I GO
 

CAN I PUT 4:88 GEARS IN A STOCK 90 5.0 CONVERT WITH AUTO AND WILL I NEED AN ALIMIUM DRIVE SHAFT

You could if you wanted to go like 15 miles per hour in overdrive at redline!

Seriously, as an example going from a 2.73 to a 3.73, may car lost 9 mph on the top end (went from 135 to 126 mph) so any torque advantage you might realize from going to such a steep gear would be traded off on the top end. If your mill is stock with stock electronics, it starts going south powerwise above 5500 rpm and then you bump into the rev limiter at 6250! This is all considering tires in the 24 to 26 inch range, if you plan on running a set of 44 inch super diggers in the rear then you might be able to run those 4.88's http://www.mustangworks.com/msgboard/wink.gif

SO WHAT DO YOU THINK A GOOD GEAR WOULD BE?? 4:11s IT IS AOD. AND WHAT ABOUT THE ALUMINUM
DRIVE SHAFT?

ya, 4.10 is the highest you want to go if you plan on driving on the street. if you do a lot of street driving, try 3.73

Can I suggest a 5.** gear..You wont go very fast but you sure will top out in a hurry!!
Seriously--I would go with a 4.10 gear.

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347 Stroker Motor: Balanced, Cobra Transmission, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, BBK 1 5/8 Headers, 30lb Bosch Injectors, Holley AFPR, March Underdrive Pulleys, Perma-Cool Fan, 3-Core Radiator, Accel Performance Coil, Accel 300+ Racing Wires, Ram Air, K&N Filter, 73mm Vortech MAF, 70mm TB, FlowMaster Exhaust w/BBK Offroad H-Pipe, Hurst Shifter, 3:55 Gears, Ram Clutch, Cross Drilled Rotors, AC and Smog del, rear seat del.

The driveshaft will definately clear up any shaking that comes around after gear intsall. Mine was shaking horribly around 70. I put in the Aluminum DS and it was cured. This is the only advantage of the aluminum driveshaft. Well, besides it weighs a few pounds less.

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90 GT 150k on the motor never had the valve covers off, 1 5/8" headers, x-pipe, 2chamber flowmaster,fms aluminum ds, 3.55, best time on 245/45/17 2.08 60', 13.906 @ 98.98