Looking to replace 03 manual transmission

Should test your transmissions front pump for pressure take the two transmission lines off the radiator and run them into a 5 gallon bucket and start it and look in the bucket and see if you have pressure coming out one of the lines if no pressure or weak pressure front pump is done look for a replacement most older transmission can have reverse and no forward gear due to lack of pressure or low fluid level.

1963 rambler
Laticia, Sound like your Rambler Flash O Matic transmission needs internal work/rebuilding. Have checked by a good tranny shop. No drive gears could be clutches, valve body, pump,bands,etc.
Check the attached links, transmission kits and replacements. Good luck
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AMC Transmission eBay

http://www.fatsco.net/borg-warner-35.html

T35 transmission parts Borg Warner T35 transmission parts

Most likely it's not the shift solenoid. It's an internal problem in the transmission. But if you want to throw money at it. there are two solenoids on the front side of the transmission that are always a replace on rebuilds. One is about 3 inches long and the other is the same, but is a dual solenoid pack.

Sounds like worn clutches, more than likely the transmission needs rebuilt or replaced.

Check to see if the trans codes match from the VIN or the Ford manufactures plate on the drivers side door jam on both trucks.

It is a common promblem with the Sorento, I did have the same promblem with my 03 sorento,and same with a co-worker who has a 05 sorento and you can also google it too, and it cost me well over 600us dollar to replace and fill/oil/llube and get it working. The compressor new was 289.00 and labor+, depressuring the ac refrigerant and all total was 637.88. If you plan on having this car over the summer and going without ac, that is fine. My compressor went broke for about a year until I had enough money to fix it, however since then, it went well for about 2 years, until I trade it off. I would say the sorento are cheap, which kia is.. It loose value, cheap to buy compare to other, but is a piece of junk and is very expensive to fix due to the expense of parts.

You will be fine to replace the fluid using the proper variety (or compatible modern alternative) of transmission fluid. The main concern that replacing transmission fluid in an older vehicle is that if the fluid has not ever been changed during the life of the vehicle, or not nearly often enough, that varnish which has built up on the internal passages and mechanisms of the transmission will be mobilized due to the detergent action of fresh transmission which can permanently damage the transmission. This is normally only an issue if you were to change the fluid in a car which had run for over 100,000 miles without ever having the transmission fluid changed before.

CHEAPER TO REPLACE TRANSMISSION THAT TO CONVERT IT INTO MANUAL.YOU HAVE TO PUT IN A CLUTCH MASTER CYLINDER AND SLAVE CYLINER.YOU HAVE TO PUT IN CLUTCH PEDAL IN FLOOR BOARD.YOU HAVE TO CHANGE TRANSMISSION SHIFT LEVER TO MANUAL STICK SHIFT.YOU LOOKING AT A HEAD ACHE.BETTER AND CHEAPER TO REPLACE TRANSMISSION.IF YOU GO MANUAL.YOU WILL SPEND MORE MONEY TO GET IT SET UP AND BUY PARTS TO GET IT TO WORK.

Sounds like it could be the ECU (electronic control unit); easy to change. I have bought used ones a lot cheaper than new ones and work fine. Your year may be located under the glove box to the right behind panel (my older car was passenger side under the mat). They are easy to change out regardless of location.

How tight does the brake line get when turning? How is the sturts, does the tire rub when turning? Did you replace the inner and outer bearings?