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 Post subject: Gear ratio help
PostPosted: Sun Dec 04, 2016 10:07 pm 
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Joined: Thu Jun 23, 2016 7:14 am
Posts: 16
I have a 94 Firehawk #490 of 500
- LT1 V8
- 6 Speed Manual
- 78K miles
- Vortech V1 supercharger
- Front Tire size: 275/40/17
- Rear Tire Size: 285/40/17
- Slicks : 325/60/15
I realized the rearend was leaking all over the garage from the cover and drive shaft. I have a stock 10 bolt, w/ 3.42 gears. Since I'm ripping it apart, should I upgrade gears? Suggestions for ratios? Also when I pulled the difference. Cover there was quite a bit of metal shaving on the cover magnet. Any input would help.


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 Post subject: Re: Gear ratio help
PostPosted: Sun Dec 04, 2016 11:42 pm 
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Joined: Wed Jan 05, 2005 3:59 pm
Posts: 2586
Location: The Empire State
4.10's is a popular gear swap. Since your supercharged it might be best to stick with 3.42's. I can't speak for Supers but for turbos, i would have been shifting before boost hit full on if I had 4.10's

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 Post subject: Re: Gear ratio help
PostPosted: Mon Dec 05, 2016 12:25 am 
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Joined: Fri Dec 19, 2003 12:40 am
Posts: 137
Location: Raymond IL
410 s in a 10bolt is a timebomb. Stick w the stock ratio since you are supercharged.

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 Post subject: Re: Gear ratio help
PostPosted: Mon Dec 05, 2016 12:35 am 
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Joined: Thu Jun 23, 2016 7:14 am
Posts: 16
Thanks for the knowledge. What about the bearings and such? Should I replace all of it since I have it opened up?
Also what's the best gear oil I belive I have the Auburn rear end so from what I've read NO SYNTHETIC.... I guess it ruins the Brass components. 75W 90 but any recommendations on brand?


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 Post subject: Re: Gear ratio help
PostPosted: Mon Dec 05, 2016 2:16 am 
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Joined: Sun Jun 28, 2015 8:58 pm
Posts: 151
Location: New York
TTOP350 wrote:
410 s in a 10bolt is a timebomb. Stick w the stock ratio since you are supercharged.


Agreed. 3.42 is a pretty good all around gear for an M6. Especially with a blower you aren't going to be lacking for acceleration. What I WOULD do is upgrade as much as you can if you are keeping a 10 bolt (weld axle tubes, forged axles, rear end girdle maybe even a C-Clip eliminator, etc etc).

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2001 Formula Firehawk #293


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 Post subject: Re: Gear ratio help
PostPosted: Mon Dec 05, 2016 2:17 am 
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Joined: Sun Jun 28, 2015 8:58 pm
Posts: 151
Location: New York
tinmidl wrote:
Thanks for the knowledge. What about the bearings and such? Should I replace all of it since I have it opened up?
Also what's the best gear oil I belive I have the Auburn rear end so from what I've read NO SYNTHETIC.... I guess it ruins the Brass components. 75W 90 but any recommendations on brand?



Any off the shelf will be fine. It's going to turn to mud anyway ;-). I wouldn't pay the extra for really high end fluid in a stock rear axle unless you are hunting for every .001 at the track.

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2001 Formula Firehawk #293


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