4.88 installed...break-in suggestions?
01-18-2009 | 05:04 AM
#21
JK Freak
Joined: Feb 2007
Posts: 709
Likes: 1
From: Downunder
Then help us all. Whats up with the JK manual clutches???????why are the squeeking????
Also it is good option to put in 4l and drive on dirt road normally to break in the front gears also....
Also it is good option to put in 4l and drive on dirt road normally to break in the front gears also....
You're right about being no difference. However, it is recommended to go easy on the driving for your first 100 - 150 miles. Many think it's just for the engine but it's also for the rest of your powertrain components to have time to break in properly.
With a new gear set, I would recommend not off-roading, keeping it under 65 mph, and no full-throttle starts for the first 150 miles. Other than that, drive it like you would normally do.
To qualify my statements, I used to be a GM tech for 15 years. I was technically a "bumper-to-bumper" tech, but my specialties were transmissions, transfercases, and differentials.
With a new gear set, I would recommend not off-roading, keeping it under 65 mph, and no full-throttle starts for the first 150 miles. Other than that, drive it like you would normally do.
To qualify my statements, I used to be a GM tech for 15 years. I was technically a "bumper-to-bumper" tech, but my specialties were transmissions, transfercases, and differentials.
01-18-2009 | 05:21 AM
#22
JK Junkie
Joined: Jul 2008
Posts: 3,017
Likes: 0
From: Lakewood, OH
There is a big difference between race gears and street gears. Street gears use a harder metal than race gears. Race gears use a softer metal to promote impact loading and bending. While this isn't exactly ideal for racing, the flex of the metal is certainly better than a broken tooth. The downside being a shortened life of the gear set.
Street gears use a harder metal and that's why a break in period is needed. As a rule of thumb, getting 500 casual miles on a new set of gears, changing the gear oil before tearing it up is advisable. That allows the gears and their harder metal to clean up before serving their next 100,000 miles.
I also run some ATF in the differential for a couple miles (less than 5) before loading it up with gear oil to clean up anything left behind. Works well and assures you are starting off with a really clean differential.
Street gears use a harder metal and that's why a break in period is needed. As a rule of thumb, getting 500 casual miles on a new set of gears, changing the gear oil before tearing it up is advisable. That allows the gears and their harder metal to clean up before serving their next 100,000 miles.
I also run some ATF in the differential for a couple miles (less than 5) before loading it up with gear oil to clean up anything left behind. Works well and assures you are starting off with a really clean differential.
01-18-2009 | 08:19 AM
#23
JK Jedi Master
Joined: Feb 2008
Posts: 12,882
Likes: 172
From: Maine
There is a big difference between race gears and street gears. Street gears use a harder metal than race gears. Race gears use a softer metal to promote impact loading and bending. While this isn't exactly ideal for racing, the flex of the metal is certainly better than a broken tooth. The downside being a shortened life of the gear set.
Street gears use a harder metal and that's why a break in period is needed. As a rule of thumb, getting 500 casual miles on a new set of gears, changing the gear oil before tearing it up is advisable. That allows the gears and their harder metal to clean up before serving their next 100,000 miles.
I also run some ATF in the differential for a couple miles (less than 5) before loading it up with gear oil to clean up anything left behind. Works well and assures you are starting off with a really clean differential.
Street gears use a harder metal and that's why a break in period is needed. As a rule of thumb, getting 500 casual miles on a new set of gears, changing the gear oil before tearing it up is advisable. That allows the gears and their harder metal to clean up before serving their next 100,000 miles.
I also run some ATF in the differential for a couple miles (less than 5) before loading it up with gear oil to clean up anything left behind. Works well and assures you are starting off with a really clean differential.
I don't see where this is good advice. It doesn't show up in any published instructions for changing gears and properly breaking them in.
Regular gear oil would have the same cleaning effect, and would not have to be changed after five miles. Change the gear oil after a few thousand miles to remove the debris from the gears' lapping in process.
01-18-2009 | 08:51 AM
#24
JK Junkie
Joined: Jul 2008
Posts: 3,017
Likes: 0
From: Lakewood, OH
You had a pretty good post going until the last two sentences.
I don't see where this is good advice. It doesn't show up in any published instructions for changing gears and properly breaking them in.
Regular gear oil would have the same cleaning effect, and would not have to be changed after five miles. Change the gear oil after a few thousand miles to remove the debris from the gears' lapping in process.
I don't see where this is good advice. It doesn't show up in any published instructions for changing gears and properly breaking them in.
Regular gear oil would have the same cleaning effect, and would not have to be changed after five miles. Change the gear oil after a few thousand miles to remove the debris from the gears' lapping in process.
During the break in period of new gears they will be exposed to more heat in the first few hundred miles than they will likely see over the rest of their useful life. Cleaning them up for the next several thousand miles is beneficial, isn't harmful for a few miles and provides an excellent base for your new gears to live for a long time.
