4:10's are in, couple questions.
 

Well, it took a little longer than expected, but the 4:10's are installed. Gonna give them a little break in time just in case before I do any spirited driving. No whining, but I have a couple questions.

Is it normal for 4:10's to:

1. Be slightly louder than stock when in reverse?
2. seem to slow you down quicker when you let off the gas, (maybe its my imagination)

lol mine seem to slow me down quicker for sure, i use that more than I do the brakes

You dont have to break them in. They're good to go from the install.

there gunna slow you down quicker cause your riding a higher RPM basically all the time.

No need for breakin kemosabi, let er' rip.

You should always break in your new gears using the process off roaders have for a long time. after you get them dont drive faster then 55-60 mph only drive for 20mins at most then pull over let them cool for awhile then drive them again for 20 mins at most you do this about 2-3 times and then they are seated well and will wear nicly.

I was told to first, drive the car 1-2 miles, let cool. Drive for 5-10 minutes around 45-55 mph, let cool. Make a couple 10 min. trips, good to go.

http://tccoa.com/articles/gears/gearbrake.html No I didnt do this, I found it after I got my gears installed. Getting the measurments wrong while installing your gears will also make them wine.

Gear break in time WTF

The guy that installed mine has been doing it for years and laughed when I asked that.

the only thing that will hurt brand new gears, I mean just installed is traveling at a steady high speed say 65mph for a long period of time. So don't go on vacation the next day after a gear install. But really there is no break in period.

yes there is they need to heat up expand cool and do it again a few times to set well. or they will throw off the tolerances later on and whine (in most cases). "Ask any real street racer, it doesnt matter if you win by an inch or a mile."

I have always broke them in before racing or long drives. It is common for a lower gear (3.90, 4.10, 4.30, 4.56 etc.) to make a slight whine. Have you ever noticed the gear whine on a steep geared truck such as a dump truck? You can hear them pulling away from a light. They run very tall gears. Yes a lower gear ratio will slow you down faster just as letting off in first gear will slow you down faster. Enjoy your 4.10's!

:ban: :ban: :ban:

For what......its true.......and he's a mod he'll ban you

There is no time needed to break in gears. They are either going to work, or not. simple as that.

Then why do the gear manufactors recommend breaking them in?

Everyone has an opinion on breaking in geras or not breaking them in. I did the heat up cool down trick on mine.. drove for 10 miles let cool for about 30 minutes, did it 2 more times. I dunno if it really helps or not but I changed my gear oil after about 2k miles to make sure they were wearing ok.

Its saving their ass if something goes wrong. Obviously you take it for a drive and listen for problems. With the installation of gears, if you have someone unexperienced or doesnt know the correct backlashing and blah blah blah, you can cause damage. "break-in" is easier to say then "dont go too fast as first, and please listen to problems so that you dont break something or cause damage to your rear end components." Ive had all of our drivetrain master techs and two other drivetrain techs down the road also say that "break-in" isnt necessary as well. If something is wrong, youll hear it in the test drive.

It's not to determine if they are okay. You do that by running them through with marking compound and checking the pattern during install. It's just like Spike said you need to heat them up and let them cool before prolonged use.

++++++1 that is correct. IF you dont break them in will they whine? maybe not now, but they sure as heck might later on. IF you look at any off-road shop that does gears such as 4wheel parts, you can not leave until you sign a waiver that says you will fallow the break in setup to a T or they wont warrenty your rear end at all (i have done a good bit of business with them in the past). we can all argue for hours but you should really break in your new gears to get them to seat well.

Now i need my overnight parts from jaaaa-pan so i can build my h-22 for my mustang.

The guy that did mine did about the same thing but it was weird. He did it at his house for side money. He works for ford and has done gears for 35 years. The way he set mine up for 373's, which usually don't whine, was he used paint and patience. Then he opened the shop door with my car facing the door and let it run in first on jack stands at idle. Not sure how long with some kind of lube, he didn't say. Took the cover off and checked the gears. Put diferent lube in and basically did what every one else did. The only thing he told me was that he liked to see the pattern before it was under driving load. I used frpp gears. That was all he would install. Before you attack it was just his preference and he cut me a deal.

Huh? ......:confused:

it was a joke at what dustin was saying.

He used Ford gears because they have a uniform backspacing making them faster and easier to install. Ford uses the same backspacing on all it's sets so you don't have to measure them. You use marking compound to coat the gears, run them through then diassemble and read the pattern. If it is not uniform you are not making full contact and will cause pre-mature wear and a whine.