Ive got a 2750 pound mustang,306 on alcohol timing currently on 28 10.5 radial tire running 710s at 3500 ft pf air 90 degrees.Going from a 411 gear to a 488 just curious what difference this would make?

This message has been edited. Last edited by: Bubba9x9,

Need a little more info , what trans you using, you using a tranny brake and what RPM you leaving at , also what RPM shifting at and what RPM fall back after shift and RPM at the stripe...

posted July 05, 2018 09:28 PMHide Post

Need a little more info , what trans you using, you using a tranny brake and what RPM you leaving at , also what RPM shifting at and what RPM fall back after shift and RPM at the stripe...

Powerglide,no brake,leaving 3800 shifting 6400,pretty sure going through the lights about 6400 as well

what is your MPH now , if its around 96 MPH I'm not sure your motor could use that gear

This message has been edited. Last edited by: J178RED,

Mph is 96-97

That boy will be choking on the top end

Should help little motor pull on bottom end as long as can handle rpm at the stripe.!/8 mile no issue,but 1/4 mile it will be humming pretty good. Go to Wallace calculator and rn humbers it will get you dang close to real numbers.

If it hooks up, it will be faster. You may be in for some suspension retuning to keep it consistent, especially with the radial.

try shifting higher also