How do you change the gearbox of a '90 LeBaron v6?
First: You have to calculate 7 h for this! Then it's the best, if you buy a Chilton Manual No 20384 (Chrysler front wheel drive cars 6-cyl. 1988-1995 repair manual) to see more. You have to remove the wheels and brakes to access the tranaxles and to remove them and you must remove all the tubes to have access to all screws.
Why proton perdana v6 auto gearbox always giving problem like oil leak is there any other option to replace this gearbox. PLEASE specify with cost?
Remove the drive/prop shaft(s) from the gear box, remove the gearbox. Take the clutch and mechanism out and replace with the new one, you will have to use a clutch alignment tool to make sure that the centre hole on the clutch lines up with the crank shaft. Then put the gearbox back on along with the drives/prop-shafts. To be honest seeing as you had to ask the question, I recommend you don't attempt it…