Changing gears 3.73 or 3.91?!? - Pontiac GTO Forum
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post #1 of 22 (permalink) Old 03-24-2010, 12:08 PM Thread Starter
 
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Changing gears 3.73 or 3.91?!?

I want to switch my diff soon to 3.73 or 3.91 gears I am goin to be racing the car at the track so I want a strong rear. I want to know what brand to go with and what people are running gear ratio wise? I know there is richmond and motive gear but I wanted to know the best one to go with, and I am goin to do the install myself if any sugestions please let me know thanks
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post #2 of 22 (permalink) Old 03-25-2010, 10:52 AM
 
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i cant believe no one replied yet lol!!
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post #3 of 22 (permalink) Old 03-25-2010, 11:13 AM
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What kind of track?
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post #4 of 22 (permalink) Old 03-25-2010, 11:27 AM Thread Starter
 
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1/4 mile drag I have headers and I am goin to cam it by the summer and mabe in the way future supercharge it
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post #5 of 22 (permalink) Old 03-30-2010, 04:07 AM
 
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If it's an auto 3.73's, if it's a stick 3.91's. On a side note i always laugh when people tell me you'll have less top speed with 3.91's! Like our cars will really reach redline in 6th This isn't the days of four speed sticks anymore people!

<-- Guess which ones quicker?.....Nope! Not even close.
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post #6 of 22 (permalink) Old 03-30-2010, 03:53 PM
 
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its a stick... thanks guys
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post #7 of 22 (permalink) Old 04-21-2010, 08:06 PM
 
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so whos making gears these days on our cars? thats one thing i'm looking for ..... i was looking for 4 10 gears.... but can't seem to find them....any idea if they are out there....?
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post #8 of 22 (permalink) Old 04-23-2010, 12:02 PM
 
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re

here is my input on this. With the stock gear 6 speed we are just shifting into forth at the finish line. Not sure about the automatics but if the overdrive gear is an actual gear and it will upshift into overdrive at full throttle then I would say that the autos can use a steeper gear. Now with the 6 speed launching it out of the hole is important to get a good 60 foot. But getting a good top speed MPH is also important and you are only gonna knock off a few tenths at the end of the quarter by adding horsepower but keeping the stock gears. Your still crossing the finish line at the same RPM and the Same MPH unless you can get into fourth as soon as you can. I would imagine any time after the 1/8th mile. Im not sure what gear we are in by the 1/8. On one outting at the track I held 3rd gear until the end hitting the rev limiter and had my fastest run but the slowest MPH 60 ft 2.25 330 6.091 1/8 9.208 MPH 79.39 1000 ft 11.829 1/4 14.12 98 MPH----danfigg
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post #9 of 22 (permalink) Old 04-23-2010, 12:17 PM
 
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I've got the A4. What kind of gas mileage would I lose going from the 346 to a 373?
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post #10 of 22 (permalink) Old 04-23-2010, 02:29 PM
 
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Quote:
Originally Posted by 1badass06goat View Post
so whos making gears these days on our cars? thats one thing i'm looking for ..... i was looking for 4 10 gears.... but can't seem to find them....any idea if they are out there....?
Here you go: GTO WHEEL HOP AXLE AXLE GFORCE1320 GFORCE ENGINEERING GFORCE1320 SPOOL GEARS



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