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I have a 72 coupe with a semi-mildly built 302 and a FMX tranny
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?
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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.
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
i have had my 4.10's for about 50k miles. i use it as a daily driver and take it from arizona to san diego or anaheim at times and never had any real issues. plus like evryone says, it will give u a great kick whenever u take off from a stop. id recommend them to anyone. really good mod
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