I had 4.10s installed about two months ago and will never look back. I've not really paid a lot of attention to where 1st and 2nd max out but I'm thinking around 35 and 50 respectively. At 70 you'll cruise at a comfortable 2600 or so and you'll love how the car pulls even in O/D. Great gear for these autos, no more lugging and car just feels much lighter on its feet.

On the negative side I lost 2-3 MPG (who cares) and had have had to do some transmission tune tweaks with my tuner. My regular tune loaded with a 4.10 from custom options made it not quite right due to funny shift points and too much shift pressure. After a couple of rounds we got it dialed in nice and I'm just making a few tweaks.

All in all I can't say enough good things about the 4.10s, you won't regret them.

Tim

 

Recently finished about 750 mile road trip. I got just shy of 26MPG doing 70 to 80 a lot and running the AC. The engine turns 2500 at 80. Other road trips while I still had the 3.31s would have been on the plus side of 28ish running the AC. It took only a few seconds to go from 65 to just shy of 100 up a 6% grade when I put the pass on a left lane lover. The other car tried to keep up when he saw me go for the pass. He didn't. These cars accelerate fast even up hill and still surprises me. I find the 3.73s to be adequate.

 

In my GT Automatic with 4.10's and the factory height tires, 60 mph = 2100 rpm's and 80 mph = 2800 rpm's. I don't really know where 1st and 2nd max out, but they are usable in daily (normal) driving. At WOT, 1st gear goes by quickly (so does 2nd). You can see/hear just how quickly in the video below that I took from inside my car at the track....

 

Nice...is it necessary to buy the bearing, etc? I figured the install kit would be a must. I don't have alot of knowledge about what's needed besides the ring/pinion.

 

A complete install kit that includes new bearings, crush collar and all the necessary adjustment shims is always best. Plus new fluid and friction modifier.

 

It's better to do it right. If you're in there, replacing the moving parts is the logical thing to do. Also considering that bearings can be damaged by removal and reinstallation. Best to have the new stuff go in.

The only thing that didn't get replaced with my install was the clutch packs.

 

Good to know. Thanks

 

So what is the final call?? 4.10's are my bet!

 

Yes, I believe that's the way to go. Was thinking back to when I had 3.73 in my other mustang and my buddy had 4.10's. My wasnt near enough, and everyone thought his was a rocket ship compared to mine.

 

I did them too!

Tim

 

Where did u buy everything?

 

If you get the parts from a speed shop then take them to a mechanic to install, be prepared to not have a no whine guarantee. But you will get them in for cheaper.

In my case, I went to a drive line shop who would guarantee no whine. But they supplied the parts. They went with Ford OEM 3.73s and a complete rebuild including bearings and seals. The clutch packs were optional but I elected to skip them as my car had about 8,000 miles on it at the time. There is absolutely no whine on the OEM gears.

 

I too went with 4.10's in my auto car. It's a great way to go. I have tunes for 87 octane, 92 octane (both performance tunes), and one tune for winter driving (which is good for snow & rain). I love'em.

 

Same here. I almost never buy parts at the local speed shop, I pick them up online and have the shop install. However in the case of gears I purchased all the parts and had them do the install in the event there were issues.

Tim

 

4.10's! Though not a stang I've got 4.11/3600 stall on my Z28. It was definately a blast, though street tires (even 315's) made all of first and most of 2nd useless.

 

4.10 ... best of all my mods ... you can sit in stop and go traffic w/ foot off the clutch ... you get so much more pick-up ... and I picked up 1-2 mpg (I think b/c I am running in a more efficient part of the power band). Only drawback is that 1st can be jerky. And, when I let a friend drive, I always tell them to start in 2nd. Oh, and one more thing, the Ford kit comes with many thin shims that you decide how many to add on install. I took it to a place that knew what they were doing ... they used a single shim.

 

4.10's

 

My only concern is traction off the line. Orrr any time for that matter w/ 4.10's.

 

Almost but not quite. Rear wheels feel like they are on the hairy edge of breaking loose but don't. I did have to ease back on the shift pressure (auto) to keep any semblance of traction on the 1-2 shift, but now that I have it dialed in it's perfect.

I do have a questin for you Colby... Why the heck do you not have 4.10s installed by now?

 

Lol, well ive been trying to dial in my torque coverter problems... Which seemed to be spot on now