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First, I am looking for a trakloc differential. Can anyone recomend one that is not too expensive and doesn't require any mods? And which gears are better, 3.73s or 4.10s? Second, what is a good stall rpm for a torque converter for street use with occasional racing? And where is a good place/brand to get it? Also, should I just do a jmod, or get a valvebody from Performance Automatic? My car has 81,000 miles, and I know I also have to get a chip for all of this.

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Trak-Loc: it depends on what you want. The easiest might be to find a used unit and have it rebuilt if necessary. A more expensive option is to buy the Trac-Loc unit and have it installed. (At least I think it is more expensive.) Maybe someone else will chime in.
Gear choice: you really should just read up on them and decide for yourself. Look for some RPM calculators and figure up what RPM your engine will run at different cruising speeds and go from there.
J-mod or valve body: j-mod, j-mod, j-mod.
Torque converter: when you ask on these forums you will find that nothing short of a DirtyDog built TC is acceptable. Get in touch with him.
 

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You are asking questions that cannot be answered as simply as you'd like. Alot of it is a matter of opinion.
Gears
4.10 will be faster they will also use slightly more gas than 3.73's (1-2mpg) and will require a speedcal to correct your speedometer.
3.73 is a very popular choice for daily driven cars. Mine has 3.73's and I lost 2-3mpg from stock on the highway and actually saw improvements in mpg on the back roads. If you keep it under 60 3.73's are a very economical choice. For the 3.73 you can use a purple 21 tooth speedometer gear to correct your speedometer.
As for cheap on a rearend you might look for used otherwise if you don't have a good 900 to invest you'll be better off taking a 3.27 traction lock unit and using it until you can afford to change gears in it.
Converter stall is another variable. Personally anything under 3200 on any 4.6 is a waste unless maybe you have a roots supercharger. For a stock motor I'd say 3600-3800 or maybe more if you want serious aggresion however without any power the lockup will seem fierce if you use a good converter. Don't bother with the PI singleplate units. Go triple plate or don't bother. For quality singleplates there are 2 other options. CircleD converters or myself.
Alan
 
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