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  • Thinking about downgrading to 3:42

    Yea, I know, you guys probably thinkg I'm crazy. My car's been stored for the winter for 2 months now and I've been thinking. Don't get me wrong, the power is there and the pull is increadible with an M6, but there's 2 reasons why I'm thinking about downgrading to a 3:42:

    1. Gas. I $h#t you not, I go thru $10.00 a day and with these gas prices it's gonna get worse.

    2. Gear whine. I've tried everything to get rid of it (even bringing it back to the shop where I had it done to get it re-shimmed), but it just won't go away.

    My 3:73 gear was the second upgrade I did to my car before my ram air. With a 3:42, I think I would feel comfortable.
    Hercules



    2008 Sunburst Metallic HHR LT

  • #2
    What brand did you get? How old are the gears? I might be interested
    Steve
    79 FSJ - most expensive AMC Jeep ever Mods
    87 GN - its just a 6... Mods
    93 Z28 - slightly tweaked Mods
    http://home.comcast.net/~budlopez

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    • #3
      You may want to consider a takeout rear end assembly from an M6 car. At least you know the gears will be quiet.

      While you're in here, you might want to read here:
      http://www.f-body.com/forum/showthread.php?t=4197

      Comment


      • #4
        Dude i feel you on the gas mileage. The whine is also an issue for me too. But when you let me drive your car at the track, i didnt notice a hint of whine in comparison to mine. Let me know if you sell the gears cause i have a friend that wants some.

        Sorry officer, im not speeding... Im qualifying
        Daily Driver:1990 ford probe 5 speed with like 13 horsepower at the crank.

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        • #5
          Do you have the original gears? If you do aftermarket, you could still have whine with the 3.42s.
          '95 Trans Am - A4, LE2 heads, LE1 cam, 1.6 ProMags, Comp R's, AS&M CAI, AS&M 54mm, MAC midlengths, Random Tech. cat, Borla cat back, PCMforless, Vigilante 2800, 3.73's, BMR LCAs/panhard/shock tower brace

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          • #6
            I can't believe the 3.73's get you all that much less miles/gallon than the 3.42's. With the M6, I found the 3.73's made 6th gear a lot more friendly. There's really no reason to drive at higher rpm... just drop the rpm by going to the next gear sooner.
            Fred

            381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor

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            • #7
              Originally posted by Injuneer
              I can't believe the 3.73's get you all that much less miles/gallon than the 3.42's. With the M6, I found the 3.73's made 6th gear a lot more friendly. There's really no reason to drive at higher rpm... just drop the rpm by going to the next gear sooner.
              im with fred. i got better mileage with my 4:10's in the CompTA than i did with the 3:42's..... and i had the lt4 hot cam and a bunch of other stuff...

              it made 5th and 6th more efficient.

              The Goldens: Reno and Rocky

              2008 C6, M6, LS3, Corsa Extreme C/B, (it flys) & 2008 Yukon loaded (Titanic), 03 Ford Focus..everydaydriver.

              Wolfdog Rescue Resources, Inc.:http://www.wrr-inc.org
              Home Page: http://www.renokeo.com
              sold: 97 Firehawk, 97 Comp T/A, 2005 GTO, 2008 Solstice GXP turbo.

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              • #8
                Originally posted by Steve93Z
                What brand did you get? How old are the gears? I might be interested
                It's a Motive gear. Got it installed back in August of '01.
                Hercules



                2008 Sunburst Metallic HHR LT

                Comment


                • #9
                  Originally posted by DJ Taso
                  Yea, I know, you guys probably thinkg I'm crazy. My car's been stored for the winter for 2 months now and I've been thinking. Don't get me wrong, the power is there and the pull is increadible with an M6, but there's 2 reasons why I'm thinking about downgrading to a 3:42:

                  1. Gas. I $h#t you not, I go thru $10.00 a day and with these gas prices it's gonna get worse.

                  2. Gear whine. I've tried everything to get rid of it (even bringing it back to the shop where I had it done to get it re-shimmed), but it just won't go away.

                  My 3:73 gear was the second upgrade I did to my car before my ram air. With a 3:42, I think I would feel comfortable.
                  Bro - your gears aint too loud. Your exhaust is too quiet

                  Comment


                  • #10
                    Originally posted by Kevin - Blown 95 TA
                    Bro - your gears aint too loud. Your exhaust is too quiet
                    Great Kevin's think alike.

                    Comment


                    • #11
                      Originally posted by Kevin - Blown 95 TA
                      Bro - your gears aint too loud. Your exhaust is too quiet
                      lol. Any louder, I'd be setting off car alarms.
                      Hercules



                      2008 Sunburst Metallic HHR LT

                      Comment


                      • #12
                        Originally posted by DJ Taso
                        lol. Any louder, I'd be setting off car alarms.
                        LoudMouth baby...LoudMouth lol. I set off car alarms just by firing the Z up lol. Also, how much do you want for the gears? I'm assuming they are for the stock 7.5" rear, right?
                        Steve
                        79 FSJ - most expensive AMC Jeep ever Mods
                        87 GN - its just a 6... Mods
                        93 Z28 - slightly tweaked Mods
                        http://home.comcast.net/~budlopez

                        Comment


                        • #13
                          I've got 4.10's and hardly noticed any difference in MPG at all! As long as you can keep your foot off the loud pedal!
                          96 T/A - Heavily Modded
                          87 Caprice DGCM Boxie - Stock

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                          • #14
                            I lost 5-7mpg on the highway and 1-3mpg in the city when I went to the 4.10s. Four years ago, when I went to Vegas from Denver, I averaged 28mpg; this last fall I averaged 22mpg. The car was a lot more mild mannered in the mountains; the gears made the drive a little less comfortable. I lost a little in the city, but mostly from getting on it a little more. I really like the performance of the gear change, but believe it or not, the car is not nearly as fun on a trip and the gears are burdensome in the mountain passes compared to the stock 3.42s. However, the speeds traveled on this trip are between 79-85mph so sixth gear with the 3.42s is incredibly efficient. Oh, the speed limit is 75mph; it is enforced as keep it under 80 in some places and keep it under 90 in others.
                            '77 K5 rock-crawler project
                            '79 T/A: WS6, 400 4sp, 40K miles; Completely stock and original
                            '87 Lifted 3/4 ton Suburban (Big Blue) plow truck
                            '94 Roadmaster Wagon (The Roadmonster) 200,000 miles and still going
                            '97 T/A: (SLP 1LE Suspension, SB, & sfc(s), Loudmouth); 4.10s; B&M Ripper; R/A Hood; ZR1s
                            My daily drivers: '06 Jeep Liberty CRD (wife); '01 Yukon Denali XL (me); '03 Stratus Coupe (me)

                            I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them.
                            Thomas Jefferson

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                            • #15
                              Originally posted by markd79ta
                              I lost a little in the city, but mostly from getting on it a little more.
                              This is ususally the reason people "report" losing gas mileage when going to a numerically higher gear over the stockers.

                              Most cars will actually see an improvent in gas mileage when going from 3.42's to 3.73's. Like mentioned before, it makes the upper gears more efficient. And when going to a 4.10 your gas mileage should be better in town and possibly just 1-3 MPG less on the highway.

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