lovin the 4.10s
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Teching In
Joined: Mar 2005
Posts: 34
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From: Michigan
lovin the 4.10s yea so last nite i went and picked my car up from the shop that insatalled my 4.10s and it was raining so i couldnt really see what they were about so this morning i wake up n take the car fer a lil test drive and it seriously feels like a totally different car i mean the throttle response is so much more crisp.
im goin to the track tonite so ill let u guys kno how i did.
im goin to the track tonite so ill let u guys kno how i did.
Yes heat cycle them several times and MOST shops will tell you to break them in for 500 miles just like you would do a clutch and then reinspect the clearances and fluid for wear or shavings. I wouldn't go beat on them the day after you get them. I broke mine in for about 700 before I gave it anything close to full throttle.
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Where's all this stuff about heat-cycling gears coming from? Is this an instruction the gear manufacturers include with the gears, or is this just something someone said on one of the sites that is getting repeated w/o substance? How do the guys who put cars together strictly for racing put 500 miles on their gears before banging on them? I've got to say I've never done this with a new gear set and I've had a countless gear installs through the decades. IMO if you have a good install with the correct lash and pattern with a solid pinion spacer, you're good to go. If you have a crush sleeve/spacer on your pinion, you're screwed anyhow. Gear lash just should not change appreciably after a few heat-cycles or a break-in period. If people are trying to say you are heat-treating the gears by getting them hot and letting them cool, I don't think that's enough heat to do it.
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Originally Posted by camarodude88
well anyhow i pulled off a 12.6621 @ 110.84 with a 60FT of 1.9161 with the new gears and also launched at 2000 RPM.
Anyway you never mentioned if you're happy with that....your last times or if its feels better. We also don't know what kind of mods you have so its kinda hard to comment on it. 
Teching In
Joined: Jul 2005
Posts: 11
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There is fosfate on the gears from the factory. The fosfate is used as a anti rust. When you put the gears in at first they will heat up a lot easier casue of the fosfate. Its good to run the gear for but 40-60 miles the let it cool for 30 minutes. This will get the fosfate off the gear and allow for you to break them in properly for the first 500 miles.
Richmond gears recommend driving 10 miles of normal driving, then letting cool for 30 minutes, and repeat two or three times and that's it. Drag cars don't have to heat cycle becuase they only run short distances so they don't get a chance to heat up as a street car would. Tow cars are suppose drive 200 - 300 miles of normal driving before towing a vehicle. BTW I just had my 4.10 installed on Sat. I couldn't believe the difference in acceleration. 
I thought about getting Richmond, Strange, or Motive. Which one? Will I need a tune after gears? I was told that getting 4.10's on an auto will only bring me to about 20 MPH in 1st???? That seems a little unbelievable.
Last edited by blind527; Sep 26, 2005 at 07:44 PM.
Originally Posted by kenp
Where's all this stuff about heat-cycling gears coming from?
I don't know whether it was good advice or not; I just did it.
I can understand 2 heat cycles and a 100 miles of break-in; why it should take 500 miles seems odd to me.