Hopefully 4.10's will be going in mine next week, i figured it'd be a smarter bet since i still drive the car quite a bit.
OK.....
Can someone comment on these gears for me (the 4.10s)?
I really never go to the drag strip (1x since I've had the car). I've auto-x'd 2 times last year....and I would do that again before the drag strip.
My car would most likely stay N/A for the next 5 years. I would only be adding basic bolt-ons and perhaps a Roush Stage 3 suspension (road racing more than drag, etc).
What are the RPMs at 70-ish mph? I typically cruise at 70-75 on the highway. I need to avoid 1750rpm due to the drone of my Roush mufflers.
I have 3.55s now, and was thinking 3.73s would give "some" change, and not kill gas mileage. I would like to do a 5,000 mile road trip this summer too, btw. Detroit to California and back, via Route 66. Would 4.10s blow up the rear end?
Thanks!
How do you correct the speedometer? Can it be done with a gear or does it have to be done with a tuner?
I have 4.10's and the factory 235/50/18 tires. 60 mph = 2100 rpm's. 70 mph = 2450 rpm's. 80 mph = 2800 rpms. The drone of your mufflers will not be an issue on the highway. 4.10's will not hurt the rear end (tires and axles are still moving the same speed regardless of gearing).
4.10's are great for N/A GT's and make daily driving wonderfully entertaining. 5th gear becomes usable, instead of lugging down like the stock gearing. A long road trip will be fine with 4.10's thanks to the overdrive in your transmission.
You won't really notice any difference between 3.55's and 3.73's, so that would be a waste of money. You've gotta change at least two steps to really "feel" a difference (i.e. 3.55's to 3.90's, or 3.31's to 3.73's).
Dan, I'm a road racer also, it's been a difficult choice which way to go with the car. Drag or road race. I already have other drag cars and the Mustang fits into large sedan in the auto-X club I race with. So I beleive it will be very competitive. The straights on the road race tracks in the NW are not long enough for me to run out 4th gear with the 4.10's. But that was a consideration when I decided to go 4.10.
Your car is an automatic. Mine is a 5-speed manual. Does that factor in for anything different?
Interesting comment about tires and effective gearing. Never heard anyone make that comment, but it makes sense. I plan on sticking with a pretty normal setup. I'd probably run 18s with a 275 (all corners)...in a 40-45 series sidewall (or whatever is normal for that width).
Notquik, as you know, going from your 3.31's to 4.10's will be very noticable. Your 12.94 is good for the mods you have. What tires was that with?
Just a thought: giant wheels (20") look cool but slow you down. My stock 18 inchers turn more revoultions for every turn of the driveshaft. My 3:55's could be faster than 3:90's or 4:10's with bigarse wheels.
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