Finally got the gears broken in enough to actually start driving her hard again, and I know there's a million threads that are "What gear should I choose", so I'll post up my thoughts and reviews of running a 4.10 gear in a 5 speed, 2V car.

The good:
Feels like a totally different vehicle. Really added to the attitude of the car, and makes it really fun to drive over the stock 3.27's.

5th gear is actually useable below 60mph. My 3.27's were always ticking me off when I had to slow down to 50mph, and then try to accelerate back up to 60-65mph, and there was nothing there. Now 5th gear is reponsive from 45mph and up.

My fuel mileage in town during the break in period, went up 4mpg. Attribute part of that to the reduced throttle input needed to get up to speed, and the other part to me driving like an old man.

The bad:

60mph is now 2200ish rpms. If you do a lot of highway driving above 70mph, this may not be the gear for you. However, short jaunts on the highway are not bad. I would drive to Myrtle Beach with these on my car, which is about 2 hours away. Probably wouldn't drive across the country though. Part of this is because at those rpms, my exhaust is pretty darn loud, and would drive me crazy.

So my final recommendation for gears:

If 75% or more of your driving is in town, or on back country roads, or secondary highways (55mph), then 4.10's are the perfect choice for a naturally aspirated car. If 75% or more of your driving is highway driving, then 3.73's may be better for you, if you have a loud exhaust and would like to stay sane.

 

Them gears are the *****. Remember a couple things, these are OHC motors and 2200 is a walk in the park for these motors. Second, after you drive the car for a month or so you want even remember what those 3.27's were.
The exhaust is a hassle, just try to find a "sweet spot" on the throttle to keep the noise down a little. Congrats!

 

Ughhhhhhhhhhhhhhhhhh now you REALLY makin me wish i could hurry up n come up with the install cash for my 4.10's. I just went out in the utility room just to look at my gears sittin in the box lol

 

Mine sat in my office from Mustang Week up until 3 weeks ago, so I feel your pain. It takes time to make them bad, just doesn't happen overnight........

Unless you're independently wealthy or something, and I'm definitely not. I have to budget my mods, so things happen a bit slower than I want them to.

 

LOL no im FAR from wealthy. So yeah it definitely takes time, and much more time than i want as well

 

If you think looking at gears for a few weeks is bad. Try having to look at your supercharger for like 4-5 months before you can install it.

 

I bet that DID suck

 

Thanks for the honest review. I am going with 3.73's on my car because of the trap speeds its going to be hitting and the fact that I run 26" tall tires not 28" at the track.