I personally would worry more about the tranny than the axles Unless you are gonna run slicks. The tires will spin before you break axles. My t-5 lasted 2 years when the car was making just over 300 rwhp. I believe not powershifting was a major factor. Both areas are good to upgrade though. But if you do change out the axles, what about rear disc brakes, and 5 lug conversion and new wheels to plant the power.
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1969 Mach 1 351C with a c6(for now)
Sold 92 Rag Top GT
Procharged & intercooled DSS 331 LC
Holley Systemax 2 Intake, Edelbrock RPM Heads,E 303 ,blow thru air meter, race bypass, 42 pph injectors,65mm tb,1.7 rr, Mac long tube headers w/off road H pipe, Force 2 catback, TKO,Pro 5.0, K&N, Alum DS,3 core radiator, subframe connectors,3.73`s, Nitto DR`s and a Heavy Foot.
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