I have a 93 toyota pickup, 4cyl, 5speed, 31s, 4.10, auto locking hubs.  money is a huge issue right now, but this truck is going to be my project for the known future.  im keeping it tame for now, and thinking of putting a locker in the rear, winch on the front, as it is my daily driver.  i was looking into detroit auto lockers because of price, but i am worried about road handling.  i drive on the highway everday to work and back, 100km/hr(60mph?) and i cant have anything squirly on the road, i realize that selectable is the best, but money is an issue.  does any one , know how these handle in the snow and ice? toyota made a factory e locker that came on late 90s trucks and 4runners, will those 3rd members fit my rear axle? and does my 4 cyl have a gear driven case still? also, any suggestions on the way i should spend my money? also, with 4.88 and 33s, what am i looking at for highway speeds?  

I own pretty much the same truck and have been thinking about this as well.
seems like the auto lockers can be really weird in snow and esp. ice.
Walking, sliding sideways and swapping ends can be an issue.
Yeah, the E-locker will fit in your housing but obviously requires some cutting, grinding, welding, tapping and bashing to make it fit.  

Right now I'm thinking limited slip cause I drive my truck everywhere and need
the traction in the snow.
The Detroit Trutrac and Downey lsd might be good options
Anyway, good luck!  

Yea, I have a truck with a Detroit... let's just say it's road manors are somewhat lacking... If I had to have a locker in my DD, I would go for a strong gear type limited slip, or a selectable locker.  

If you are looking for a cheap locker that wont affect your on road performance, while staying in a cheaper range you have a couple options..

Limited slip is one way that has no affect on the driving of the truck and it will send power to both wheels. It is not as strong or as dependable as a locker cuz it will still send more power to the wheel with the least amount of pressure on it. Most limited slip carriers run about $400

Another option is to go with a Loc-rit. These is a automatic locker. It is dependable and inexpensive. But with this locker you will get a clicking noise while you corner in town or in parking lots. This is normal from this locker, and for only around $250 it is a good way to go.  

i had a limited slip in my cherokee, and i only noticed it because it would go squirly in the snow if you applied throttle, never when i needed it  

The problem with all spider gear replacement lockers is NONE OF THEM have the ability to power both wheels at differing speeds in a turn. It is either 2wd both tires same speed with one skidding or 1WD with outboard wheel coasting/ratcheting. This can effect handling and can be a a hand full on snow and ice. The best locker is a selectable one otherwise you are better off with a good LSD if this is a daily driver.  

For the toyota e locker, I am very sure all that is needed to make it fit is minor notching of your housing, and of course some minor wiring for the locker itself.  There are write ups on other sites, try searching for those.  Because this is a dd, you should really try to come up with the money for a selectable locker.  You will benefit from it now and when your truck gets built up more down the road.  Yes, your t case is gear driven.