Im in the middle of my turbo 6.0 project and my 4.56's will no longer be needed or wanted for that matter......

Trans is a th350 but will be changed to a th400 when it shows its getting tired.....
My set-up is twin garrett t04e's 57 trim
90mm tb Victor Jr intake and Elbow
60lb injectors
lq9 arp head studded and rod bolts
hand ported and castings smoothed 317's
23x duration camshaft specced by RPM(tech sponsor) here in delaware
also have nitrous either for sm. hit or intercooler sprayer or both.....

i was thinking 3.73's but thinking i run 295 40 r22's which are 32 inches almost on the street,
at the track i have 28" and 29" dot MT slicks which ever are on top of the pile pretty much.....


the plan is most psi without detonation on pump gas thinking 10 or so but i am totally clueless on what power to expect let alone setting the truck up for it.



should i dyno it with the 4.56s and see where im at then ask again?

 

I would step it down to 4.10's

 

Another for 4.10's

 

i say either 3.73 or 4.10/4.11 with that 3 speed tranny...

i would run the taller slick with a 4.11, depending on what you shift at.

i love my 4.11's.

 

Considering the turbo and the 3 speed, I'm leaning towards 3.73, although the taller tire makes me think 4.10...I think either one of those ratios would work nicely.

 

Since you have a turbo I would go with 3.42 or 3.73. My tires are 30.5" and I run 3.42s.

 

Do you drive on the highway at all? If I so, I strongly recommend 3.08's. The turbo will definitely love them too. No complaints here.

 

3.08 would work great on the hwy, but will hurt the mileage around town.