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I would think twice about your tripple cases. All that torque the 4.3 will produce with a ton of deep gearing is going to kill diff parts pretty easily or shorten there life span. As for a toy tranny behind a 4.3--I would not use anything below 151r. Anything weaker again will have a short life span. One thing that will help is the th350 with what gearing you want to run--the tranny will help lesson the shock loads--but typicly you don't that deep of gearing (tripple cases) with with an auto---plus get good brakes.
I would think twice about your tripple cases. All that torque the 4.3 will produce with a ton of deep gearing is going to kill diff parts pretty easily or shorten there life span.
As for a toy tranny behind a 4.3--I would not use anything below 151r. Anything weaker again will have a short life span.
One thing that will help is the th350 with what gearing you want to run--the tranny will help lesson the shock loads--but typicly you don't that deep of gearing (tripple cases) with with an auto---plus get good brakes.
