[Z06] New Diff
Thread Starter
Instructor
Joined: Feb 2015
Posts: 203
Likes: 5
New Diff
Hi everyone, just put a brand new straight from GM 3.42 diff in my car. I filled it with royal purple max gear with friction modifier already in it. This is my question. Is there any breakin procedure for a new diff? Just figure there has to be something to do before going all out on a new set of gears. Any help would be greatly appreciated.
Melting Slicks
Joined: Sep 2003
Posts: 2,458
Likes: 105
From: Northville Michigan
The answer to your question is yes. Drive easy for the first 4 to 5 heat cycles.
Also, the clutches and pre-load springs in the GM differential are prone to failure. When you become dissatisfied with the GM diff, call RPM Transmissions and have them build you a diff with a WaveTrac - http://www.wavetrac.net/ - differential assembly. End of problem.
Also, the clutches and pre-load springs in the GM differential are prone to failure. When you become dissatisfied with the GM diff, call RPM Transmissions and have them build you a diff with a WaveTrac - http://www.wavetrac.net/ - differential assembly. End of problem.
Melting Slicks
Joined: Feb 2014
Posts: 2,725
Likes: 149
From: chicago area IL.
i know every time I done a gear swap I was told to take it easy for 300 to 500 miles, 1st few drives i was told not to take short trips (a few miles) but long enough to heat up the diff to normal temps (15 to 20 miles) then let it cool
if you dont take it easy durring brake in you'll wind up with a whine (learned the hard way)
if you dont take it easy durring brake in you'll wind up with a whine (learned the hard way)
Instructor
Joined: Dec 2007
Posts: 231
Likes: 10
From: NH
The answer to your question is yes. Drive easy for the first 4 to 5 heat cycles.
Also, the clutches and pre-load springs in the GM differential are prone to failure. When you become dissatisfied with the GM diff, call RPM Transmissions and have them build you a diff with a WaveTrac - http://www.wavetrac.net/ - differential assembly. End of problem.
Also, the clutches and pre-load springs in the GM differential are prone to failure. When you become dissatisfied with the GM diff, call RPM Transmissions and have them build you a diff with a WaveTrac - http://www.wavetrac.net/ - differential assembly. End of problem.
Safety Car
Joined: Jan 2006
Posts: 3,940
Likes: 42
From: shavertown Pa.
Doing figure 8's is done for working the friction modifier into the rears clutches.
When a posi rear that makes noise on turns, you have to add GM modifier to the lube, doing figure 8's works the stuff into the clutches.
If you notice your rear making noise on tight turns you may have to add the modifier, GM Limited slip axle additive part #1052358.
Some lubes say you don't need it with their lubes but time will tell if you do need it.
Safety Car
Joined: Sep 2007
Posts: 4,168
Likes: 21
From: Sunniest city on Earth
Doing figure 8's is done for working the friction modifier into the rears clutches.
When a posi rear that makes noise on turns, you have to add GM modifier to the lube, doing figure 8's works the stuff into the clutches.
If you notice your rear making noise on tight turns you may have to add the modifier, GM Limited slip axle additive part #1052358.
Some lubes say you don't need it with their lubes but time will tell if you do need it.
When a posi rear that makes noise on turns, you have to add GM modifier to the lube, doing figure 8's works the stuff into the clutches.
If you notice your rear making noise on tight turns you may have to add the modifier, GM Limited slip axle additive part #1052358.
Some lubes say you don't need it with their lubes but time will tell if you do need it.
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