alright. i have a 350, which i'm gonna switch out for another better 350. i also have a 3 speed, and dont liek it too much. I want a 4 speed auto, but i have no diea where to start looking. another problem; tight budget. anybody got some suggestipns where to start looking for a GOOD 4 speed auto tranny at a nice price? any models that are good to look for?

You need to look for a 700r4, these also have over drive. One thing to remember is that your driveshaft will need to be shortend or lengthened; probably the former.

A TH200R4 is an easier bolt in, no need to shorten the driveshaft. Since the TH200R4 was available in later year G-Bodys the necessary crossmember and TV cable are available in a wrecking yard. Swapping the trans, crossmember and TV cable from a G-Body is the absolute cheapest way to get a four-speed auto into your TH350 equipped El Camino.

how much power is going into this trans?

well im thinkin somewhere round 3-400 horses or more. btw can u guys include prices for these suggestions? in kinda on a budget.

a well RE-BUILT 200 might do the trick. I still am sticking with the 700r4, you'll be happier with it; I belive.
As far as pricing, it varys from 800-2500. It all depends on location, availability, and what the guys hourly rate is.

I'm in north Florida and it cost me $700 for my TH400 to be gone through. took'em about a full day to complete.

Whether you choose a TH700R4 or TH200R4 a junkyard transplant won't hold up inder that kind of horsepower. Either trans can be built to easily handle 300-400 hp and the prices will be about the same. A performance rebuilt 200 or 700 about $1200-1400, torque converter about $250.00, crossmember about $200, misc, parts $150. On, add another $100 to shorten the driveshaft if you use the TH700R4. Sorry pal. just can't do it on the cheap.