I have a 72 coupe with a semi-mildly built 302 and a FMX tranny

1st. 2.40
2.1.47
3. 1

ok so im debating on what gears i want. This car wont really see the track its more of a local driver occasional freeway cruiser..i only drive the car about 3 times a week if im lucky..for like about 2 hours each time. I want it to be quick(er) but i dont want to force the motor going 65 @ 3500 either..but i want to know if i should really go with the 4.10 versus a smaller ratio.what will i be more happy with? gas isnt any issue for me. But my motors health is very important to me.right now i have a 275/35/20 tire and i think it has 2.93 in them. and does 0-60 in about 5-6 seconds on a peg legger. Should i put the 4.10s posi traction? will i be happy?

 

The Coyote engine is 4.3 sec 0-60 the Boss is actually 4.5 or 4.7 both with 3.73. I've done both and I liked both. I know your not worried about fuel, but I liked the distance capable 3.73 and the kick of the 4.10. With a 4.10 you'll break traction more in rain and ice, and I believe the higher you go 4.10 4.56 the more stress you put on the other components.

I have a Shaft Master aluminum with Steel braided lines, FR 3.73 and a FR rear alum diff cover. Soon I will add a Yukon posi (stronger for drag, T2 better for track) the Traction Loc in it is just a bookmark, Alloy shafts in the diff, Spec (stage 1) clutch with Spec flywheel. Hope that bomb proofs it.

Every time someone breaks a component in their drive-line, it's usually a combo of strong motor and sticky slicks.

 

With those tires and occasional freeway driving the 4.11's might be ok but 3.73 or 3.90's would be a safer bet. The problem is not having an overdrive gear so its going to work the motor hard on any extended highway cruising.

 

The most freeway driving ill do is somewhere alot the 1 hour mark..but i still have stock drivetrain

 

and i live in SOCAL so rain and ice isnt very common..50+ temp year long mostly sunshine or occasional cloudyness..so im not worried bout breaking traction..im just more worried about messing up my car with 4.10s by freeway driving

 

well i would think it is a no brainer.

it is your pleasure car... you want to be faster... you dont drive it enough on the freeway for it to do any real damage... i say do it.

 

with 275/35/20 and a aggressively built street/mild built for strip car will perform with 4.10s?? nice long burnouts? a skid mark from launch?

 

I wish I got my 4.10 gear hinstalled 50'000 miles ago! Gears r my best mod so far

 

so it really makes a huge difference i see haha

 

I just put them in my 08 and love them.