What gear to use with the 402/th400??

[TBone1970]

Originally Posted by Daves72'GMC

I have a 402BB 30 over with turbo 400 and 3.54 dana 60 and an edelbrock cam a little bigger than stock and good on the highway and quick from the start and good milage.

Hello Dave,
I have the same setup in my '70 C20. However, my RPM's get up to over 3K when on the freeway. Where does your truck run for RPM's doing 65?

Would you know how to bring the RPM's down using the same tranny and diff, maybe gearing? Any feedback/input is appreciated.
God bless,
TBone

[CG]

Originally Posted by TBone1970

Hello Dave,
I have the same setup in my '70 C20. However, my RPM's get up to over 3K when on the freeway. Where does your truck run for RPM's doing 65?

Would you know how to bring the RPM's down using the same tranny and diff, maybe gearing? Any feedback/input is appreciated.
God bless,
TBone

Dave hasn't logged in since 2010, he might not get back to you. Pretty old thread. But ... Maybe?