A stock rebuild on a TH350 should be plenty adequate if you’re not a racer.
Exactly what’s behind the 8.8:1 421 HO in my loaded Le Mans convertible.
Spending more to upgrade it is fine if you think you might be hard on it, however it does add up quickly to do anything substantial in the strength department. They’re a good transmission and my builder said upgrades weren’t necessary for my application.
__________________
1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
|