Using th400 tranny with 403 olds engine?

Je suis nouveau sur les téléphones Galaxy et j'aimerais savoir comment ajouter ma chanson préférée comme sonnerie.
j'ai un Galaxy s20: https://sonneriesgratuite.com/vela-samsung-galaxy-s20-ultra/
Merci.

I would think a beefed up 350 would work fine, the 403 is not really a high output engine that would overstress the stock trans.

having owned a 400 and the 350 transmissions I would not spend or do all that work for the 400 to fit.

I had a 350 tranny in a gm sedan for 17yrs and 380K miles . the only part I had to replace was the tail shaft bushing. I would install a 10K lbs tranny cooler with the 350 tranny. change the fluid every 20-40K miles and use dexron VI not dexron III.

anytime a transmission blows up all the tranny lines and radiator fluid system must be cleaned very completely with a flush solution.

I agree with the above two statements. The TH400 is stronger out of the box, but a well built TH350 will be just as good, and the gear ratios are better on the TH350 than on the TH400. That plus less rotating mass will result in better all around performance, and less fuel usage due to power loss in the transmission.

One other aspect - unless you get your hands on an Oldsmobile "TH-375", you will be replacing the yoke on the driveshaft. In either case, you will be shortening the driveshaft, and relocating and potentially replacing the transmission xmember.

A lot of work for less 'wheel feel' performance.