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Discussion Starter · #1 ·
For some reason, the last 2 gear installs I've done in my firebird have howled. I did 3:55's in my mustang and they don't make a sound. I followed all the instructions out there to the letter. Set the preload, checked the backlash. Both seemed to be in spec.

So is there anything I might not be aware of, that can cause the dreaded howl? Tired of hearing the gears whine when I'm driving that car.
 

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Discussion Starter · #5 ·
The stang gears are factory Ford out of a Mercury Marauder. The firebirds are Richmond. What other brands are known for howling? I want to avoid that at all costs. What is GM's brand? With ford you can just buy Ford Motorsport.
 

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good gears make some noise even at specified lash, it's something you have to live with

personally i would always run it for a while, then pull the inspection cover and inspect wear pattern. that way you have peace of mind that the noise isn't a bad thing. if it's good, throw it back together and away you go. changing oil is a good thing after breaking in gears anyway.

i've quieted them down a little bit with a thicker aftermarket diff cover, but most of the noise is resonance through the entire assembly that's hard to get rid of
 

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Discussion Starter · #7 ·
Ok now I've got a question about setting the pre-load on the pinion gear.

1. How many inch pounds is the preload supposed to be? Its the firebird formula with the 7.5" rearend.

2. Can I use this torque wrench to set the preload? As you can see, it measures in foot lbs. So I can still use it, as long as I just divide whatever the number is by 12, correct? So for example: If I need to set something to 15 inch pounds, then My needle would be in between the first and second line from zero. That sound about right?

 

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Discussion Starter · #9 ·
good gears make some noise even at specified lash, it's something you have to live with

personally i would always run it for a while, then pull the inspection cover and inspect wear pattern. that way you have peace of mind that the noise isn't a bad thing. if it's good, throw it back together and away you go. changing oil is a good thing after breaking in gears anyway.

i've quieted them down a little bit with a thicker aftermarket diff cover, but most of the noise is resonance through the entire assembly that's hard to get rid of
They say running thicker full synthetic oil, combined with a thicker differential cover can reduce noise. Anyone know what gears are known for whining the least? I take it its GM Goodwrench or AC-Delco?
 

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I don't see how richmond can stay in business if they're known for howl.
they make quailty proformance parts, if you want a fast car, you want the best parts even if there is a lil whine, but if you dont want a fast car keep it stock or drive your moms civic (not being rude at all bro) richmond are the only gears id use if i wasnt going stock
 

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Do yourself a favor by getting a smaller inch pound torque wrench. Here's one reason to. Your beam type torque wrench reads most accurately middle of the scale. Anywhere other than the middle of the scale will be off in it's reading. Then your trying to guestimate the proper place to take the reading so you end up FUBAR.

And don't sweat the money for the new torque wrench. Since you seem to have changing gears down, except for the torque thing, your friends, and friends of friends will be coming to you to do the job on their cars. You'll make your money back and then some.
 
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