I have had no trouble with it-it has been on the road 3yrs and is driven nearly daily from spring to fall. But, I do run a th350 with stock replacement parts (and a shift kit) in the 54 and usuall manually shift up and down. I would go with a Kevlar band if you plan on doing much forced/manual downshifting under heavy load. The bands hold the drums during manual down shift( or upshifting) and these are usually what burns up first. The shift kit will not help the trans hold up to down shifting at all. The lower first gear can help fuel economy especially if you do a fair amount of stop and go driving. I would do the swap in a minute, infact I am trying to get a friend to swap his iron glide out of his 348 powered 59 Impala and go to a th350 (or 700r4). Fits all 68-77 TH350 and TH400 applications. Higher stall speed improves acceleration and provides better idle characteristics when the car is in gear. Then push the accelerator to the floor while holding the brakes on. This 12', 2500 rpm stall speed, high performance torque converter is designed for factory performance applications as well as modified applications. Start the engine and place the transmission in drive while holding the brake pedal under firm pressure so the vehicle doesnt move. Chock the wheels and set the parking brake. Not to mention the early glides took more hp to spin than the alum cased ones due to heavier internals. Before conducting a stall test, check the fluid level and condition. Mostly 283 or 327 cars and a couple also got upgraded from 2bbl to 4bbl (the cars that got the trans and intake/carb swap felt like 'racecars' compared to stock form.) Every time the car felt a whole bunch better to drive. I have done a few th350 swaps in place of glides in mid 60s impalas.
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