[HammerHead]

Ok guys I had 410 gears put in a few months ago and wasn't very surprised at first. Dident really see a difference until recently. Lately my truck has been very responsive with a noticeable improvement. I've heard that you need to give them time to break in which make me ask the question. How does a fixed mechanical gear need time to break in? Or is it the computer adjusting to the new gears? Thoughts?

 

[SK-Ram]

I regeared my mustang this summer. Shop advised me to heat cycle them, and to not go wot for the first 500miles. I only made it about 80 miles before I started to hammer it, couldn't resist!

 

[Sixfive]

Ok guys I had 410 gears put in a few months ago and wasn't very surprised at first. Dident really see a difference until recently. Lately my truck has been very responsive with a noticeable improvement. I've heard that you need to give them time to break in which make me ask the question. How does a fixed mechanical gear need time to break in? Or is it the computer adjusting to the new gears? Thoughts?

Pretty sure its the computer learning new shift points(to keep it simple)
The purpose of breaking in gears so they wear/seat proper,dont get them too hot before their seated.

 

[HammerHead]

I regeared my mustang this summer. Shop advised me to heat cycle them, and to not go wot for the first 500miles. I only made it about 80 miles before I started to hammer it, couldn't resist!

80 miles? Lol. You did better than me, I made it 3 miles and laid my first patch beautiful 17 yard patch. Just look at my avatar pic:SHOCKED:

 

[roo]

Roads need to be repaved!

 

[battlerattle]

Ok guys I had 410 gears put in a few months ago and wasn't very surprised at first. Dident really see a difference until recently. Lately my truck has been very responsive with a noticeable improvement. I've heard that you need to give them time to break in which make me ask the question. How does a fixed mechanical gear need time to break in? Or is it the computer adjusting to the new gears? Thoughts?

Your talking about two seperate things here.

Breaking in the gears is allowing them to heat cycle, work harden, and for the contact surfaces to mate. There will be a bit of metal worn during this period (normal) as all the surfaces "get to know eachother". You should probably change your gear oil after 500 miles.

The feeling you are speaking of, "seat of the pants" is the computers catching up to the new ratio and adjusting all the parameters of the computer for them. Generally when you get new gears on a modern vehicle you will do one of two (or possible both) things. First is to program the computer for the new ratio to ensure accuracy of the speedo and odo. Second is to disconect the battery (or otherwise reset) to reset the computers learned functions allowing those functions to be relearned with the new ratio.

 

[HammerHead]

^^ thank for the good info.

 

[cvieke]

What Battlerattle said. I had 4.56 gears put in. Told by the shop to take it easy for the first 500 miles and bring it back to change the oil in he rear end. Took the computer awhile to learn about the re-gearing. Big differance now.

 

[HammerHead]

I changed the gear oil after about 2000 miles and it was black. At first I thought the dealership put used oil in it looked so bad. If you do a gear swap defiantly change the oil after you get them broke in.

 

[Off-Kilter]

I changed the gear oil after about 2000 miles and it was black. At first I thought the dealership put used oil in it looked so bad. If you do a gear swap defiantly change the oil after you get them broke in.

Dumb question, but why wouldn't you want to do this with a new vehicle then?

 

[dustinlee]

How is the highway driving/mileage with 4.10?? I don't want to lose any top end cruising.

 

[HammerHead]

How is the highway driving/mileage with 4.10?? I don't want to lose any top end cruising.

My gas mileage went from 18.5 to 16.2 per mile, RPS's at 80mph went from 1995 to 2375 RPS's. you will lose a little top end but not much. But your low end will improve. At first I was pissed with the mod, it took months for the gears to brake in, but now I can roast both rear tires with no problem. What gears do you have now?

 

[dustinlee]

@HammerHead
I currently have the factory .392. once I get my truck back up and going with its new mods (260cam, springs, pushrods, underdrive pulley, lifter rollers) I am leaning towards a gear swap next since the motor will be set. but I do some distance interstate driving and didn't want to kill my mileage worse than my heavy foot already does.

 

[HammerHead]

@HammerHead
I currently have the factory .392. once I get my truck back up and going with its new mods (260cam, springs, pushrods, underdrive pulley, lifter rollers) I am leaning towards a gear swap next since the motor will be set. but I do some distance interstate driving and didn't want to kill my mileage worse than my heavy foot already does.

I'd keep the 392, not much of a difference between that and the 410. I went from 355 to 410 and like it but it wasn't mind blowing like I thought it would be.

 

[dustinlee]

Thanks for saving me money I don't have!!! will keep her as she is

 

[gofishn]

3.92

Have had practically every rear end gearing known to man. in everything from Buick GS400, GTO's, Road Runners, Chargers, Monte Carlo's, etc.

I really like a 3.92 for all around use. Of course, for strictly racing, hard to beat a 4.56.

Dave
Jeesh, now I'm bummed thinking of all the great cars I was dumb enough to let go over my lifespan.

 

[dustinlee]

Yea im definitely not disappointed with my current gearing. ive hauled trailers/ camper and done really well. decent take offs and at one point ive had up to 18.5 mpg. not bad for my old goat pre mds.

 

[HammerHead]

How is the highway driving/mileage with 4.10?? I don't want to lose any top end cruising.

Just drove from Atlanta GA st. Charles MO and got 19.3MPG. Crazy but awesome