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M6: 3.42 vs 3.73 differential

This is a discussion on M6: 3.42 vs 3.73 differential within the Drivetrain forums, part of the LSx Technical Help Section category; I will be here til July 2007. It depends on what job you have, to where they send you. Like ...

  1. #41
    Silver SS in Germany
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    I will be here til July 2007. It depends on what job you have, to where they send you. Like for my job I can only go to 3 places in Germany. I have about 20 more months left in the Army til I can retire. I'm thinking of re-enlisting for 2 more. Then I will have 22 years in. It will give me a better chance of getting promoted and a bigger retirement pay.
    Last edited by Silver SS in Germany; 12-05-2005 at 04:08 AM.

  2. #42
    Super Sporting It Chevypowr's Avatar
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    I have the 6 speed T56 tranny. 5th goes to about 130-140mph, then i still have 6th but the gearing is too low to accel any further than 145mph due to wind resistance and such.
    - how so i get to 140, find an open highway and hope there's no cops.
    Borla XR-1 energy bushings UMI B&M Spohn suspension techniques eibach edelbroc K&N Richmond Eaton F.A.S.T FlashTuner NGK MSD SLP J&M - I owe it all to my mentor- my dad.

  3. #43
    Silver SS in Germany
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    Quote Originally Posted by Chevypowr
    I have the 6 speed T56 tranny. 5th goes to about 130-140mph, then i still have 6th but the gearing is too low to accel any further than 145mph due to wind resistance and such.
    - how so i get to 140, find an open highway and hope there's no cops.
    I mean that we have the same trans(T56) and rear gears(3.42) right? Or do we?

  4. #44
    Super Sporting It Chevypowr's Avatar
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    Quote Originally Posted by Silver SS in Germany
    I mean that we have the same trans(T56) and rear gears(3.42) right? Or do we?
    yeah i believe so, i have the T56 3.42 combo

  5. #45
    SS#430 1 of 74 7camaro7's Avatar
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    I personally don't see anything wrong with 3.42's on the street as far as gas milage and performance go... both are good with this set up, I think....

  6. #46
    Super Sporting It Chevypowr's Avatar
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    Quote Originally Posted by 7camaro7
    I personally don't see anything wrong with 3.42's on the street as far as gas milage and performance go... both are good with this set up, I think....
    I am happy with the stock 3.42 except when i'm going highway speeds above 125mph then the car doesn't climb as easily due to wind resistance and the low gearing of 6th. I'm looking forward to installing the 3.73 for that reason. Then the engine won't have to work as hard, and should climb up in the rpms much easier at the higher speeds. Not to mention how much quicker bottom end will be. I originally was going to go with 4.10 but figured they had to be a bit too high of a gear ration for daily street use.

  7. #47
    Member tici's Avatar
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    There are gear kits to make 5th and 6th shorter, it may help for high speed
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  8. #48
    Super Sporting It Chevypowr's Avatar
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    Were can I check these gear kits out at? Do you have a website, that might be something to consider.

  9. #49
    SS#430 1 of 74 7camaro7's Avatar
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    I'm so confused So if you get taller gears like 3.73, you'll have more acceleration on the bottom end AND top? I thought it would be more like one or the other.

  10. #50
    Super Sporting It Chevypowr's Avatar
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    Quote Originally Posted by 7camaro7
    I'm so confused So if you get taller gears like 3.73, you'll have more acceleration on the bottom end AND top? I thought it would be more like one or the other.
    it will shorten the length of each gear, therefore bringing your top end down, but since the t56 already is capable of reaching speeds of 160mph+ te top end would be brought down to let say 150mph (just an ex.) So your engine will be able to rev easier to 150 then 160 because a higher gear ratio makes it easier for your engine to work. So you would run throught the bottom end gears much quicker and accelerate much faster to 150mph then try to accelerate to 160 which is harder for it to achieve. This is sort of difficult to explain but in turn, 3.73 would make your car faster all around. If you would go to 4.10's it would be even quicker but top end might be limited to 140MPH and now your are losing top end, but gaining qucker bottom end times which would be better for 1/4 mile runs where you don't see speed of 140mph anyway, so the extra top end isnt needed.

  11. #51
    Silver SS in Germany
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    Dude just go to www.f-body.org/gears/ Check your info. You might have different gears. This does not factor in wind resistance.

  12. #52
    Silver SS in Germany
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    RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear
    500 4 6 9 11 15 22
    600 5 8 10 13 18 27
    700 6 9 12 16 21 31
    800 7 10 14 18 23 36
    900 8 11 15 20 26 40
    1000 8 13 17 22 29 45
    1100 9 14 19 25 32 49
    1200 10 15 21 27 35 54
    1300 11 16 22 29 38 58
    1400 12 18 24 31 41 63
    1500 13 19 26 33 44 67
    1600 13 20 27 36 47 71
    1700 14 21 29 38 50 76
    1800 15 23 31 40 53 80
    1900 16 24 33 42 56 85
    2000 17 25 34 45 59 89
    2100 18 26 36 47 62 94
    2200 18 28 38 49 65 98
    2300 19 29 39 51 68 103
    2400 20 30 41 54 70 107
    2500 21 31 43 56 73 112
    2600 22 33 45 58 76 116
    2700 23 34 46 60 79 121
    2800 23 35 48 63 82 125
    2900 24 36 50 65 85 129
    3000 25 38 52 67 88 134
    3100 26 39 53 69 91 138
    3200 27 40 55 71 94 143
    3300 28 41 57 74 97 147
    3400 29 43 58 76 100 152
    3500 29 44 60 78 103 156
    3600 30 45 62 80 106 161
    3700 31 46 64 83 109 165
    3800 32 48 65 85 112 170
    3900 33 49 67 87 115 174
    4000 34 50 69 89 117 179
    4100 34 51 70 92 120 183
    4200 35 53 72 94 123 188
    4300 36 54 74 96 126 192
    4400 37 55 76 98 129 196
    4500 38 56 77 100 132 201
    4600 39 58 79 103 135 205
    4700 39 59 81 105 138 210
    4800 40 60 82 107 141 214
    4900 41 61 84 109 144 219
    5000 42 63 86 112 147 223
    5100 43 64 88 114 150 228
    5200 44 65 89 116 153 232
    5300 44 66 91 118 156 237
    5400 45 68 93 121 159 241
    5500 46 69 94 123 162 246
    5600 47 70 96 125 164 250
    5800 49 73 100 129 170 259
    5900 50 74 101 132 173 263
    6000 50 75 103 134 176 268
    6100 51 76 105 136 179 272
    6200 52 78 106 138 182 277
    6300 53 79 108 141 185 281
    6400 54 80 110 143 188 286
    6500 55 82 112 145 191 290
    6600 55 83 113 147 194 295
    6700 56 84 115 150 197 299
    6800 57 85 117 152 200 304

    So if I could redline my car in 6th gear I could go 304mph.
    Last edited by Silver SS in Germany; 12-07-2005 at 07:10 AM.

  13. #53
    Member tici's Avatar
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    Quote Originally Posted by Chevypowr
    Were can I check these gear kits out at? Do you have a website, that might be something to consider.
    sorry I don't know where to get them.
    I only know they have 5th 0.82 (original 0.74) and 6th 0.73 (original 0.50)
    Maybe here http://www.richmondgear.com/

  14. #54
    Super Sporting It Chevypowr's Avatar
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    Quote Originally Posted by Silver SS in Germany
    RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear
    500 4 6 9 11 15 22
    600 5 8 10 13 18 27
    700 6 9 12 16 21 31
    800 7 10 14 18 23 36
    900 8 11 15 20 26 40
    1000 8 13 17 22 29 45
    1100 9 14 19 25 32 49
    1200 10 15 21 27 35 54
    1300 11 16 22 29 38 58
    1400 12 18 24 31 41 63
    1500 13 19 26 33 44 67
    1600 13 20 27 36 47 71
    1700 14 21 29 38 50 76
    1800 15 23 31 40 53 80
    1900 16 24 33 42 56 85
    2000 17 25 34 45 59 89
    2100 18 26 36 47 62 94
    2200 18 28 38 49 65 98
    2300 19 29 39 51 68 103
    2400 20 30 41 54 70 107
    2500 21 31 43 56 73 112
    2600 22 33 45 58 76 116
    2700 23 34 46 60 79 121
    2800 23 35 48 63 82 125
    2900 24 36 50 65 85 129
    3000 25 38 52 67 88 134
    3100 26 39 53 69 91 138
    3200 27 40 55 71 94 143
    3300 28 41 57 74 97 147
    3400 29 43 58 76 100 152
    3500 29 44 60 78 103 156
    3600 30 45 62 80 106 161
    3700 31 46 64 83 109 165
    3800 32 48 65 85 112 170
    3900 33 49 67 87 115 174
    4000 34 50 69 89 117 179
    4100 34 51 70 92 120 183
    4200 35 53 72 94 123 188
    4300 36 54 74 96 126 192
    4400 37 55 76 98 129 196
    4500 38 56 77 100 132 201
    4600 39 58 79 103 135 205
    4700 39 59 81 105 138 210
    4800 40 60 82 107 141 214
    4900 41 61 84 109 144 219
    5000 42 63 86 112 147 223
    5100 43 64 88 114 150 228
    5200 44 65 89 116 153 232
    5300 44 66 91 118 156 237
    5400 45 68 93 121 159 241
    5500 46 69 94 123 162 246
    5600 47 70 96 125 164 250
    5700 48 71 98 127 167 254
    5800 49 73 100 129 170 259
    5900 50 74 101 132 173 263
    6000 50 75 103 134 176 268
    6100 51 76 105 136 179 272
    6200 52 78 106 138 182 277
    6300 53 79 108 141 185 281
    6400 54 80 110 143 188 286
    6500 55 82 112 145 191 290
    6600 55 83 113 147 194 295
    6700 56 84 115 150 197 299
    6800 57 85 117 152 200 304

    So if I could redline my car in 6th gear I could go 304mph.
    Oh man imagine that. I took my camaro to 140 once and in 6th I was in between 3500-4500 but I was watching the road so I don't know exactly. I think that chart is a bit top-heavy. Or it doesn't simulate real driving conditions like wind resistance, dead weight of the vehicle and such

  15. #55
    Silver SS in Germany
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    Someone else posted gear ratios a while back and I wrote them down.
    1 2.66
    2 1.78
    3 1.30
    4 1.0
    5 .75
    6 .50

  16. #56
    Story of My Life!! BIG D's SS's Avatar
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    I have 4.10's in my SS and at 75 I'm turning about 2000 80 is about 2200.
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  17. #57
    Super Sporting It Chevypowr's Avatar
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    Quote Originally Posted by BIG D's SS
    I have 4.10's in my SS and at 75 I'm turning about 2000 80 is about 2200.
    Thats not as bad as I thought it would be, with my stock 3.42 i'm turning 1500 at 70. What MPH does first gear redline at?

  18. #58
    rlerma
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    All this information is very interesting, i just got a 2000 Camaro SS with 65,000 mlies. I am more interested in highway racing. I was testing it and went 155MPH, but how much faster can you go on an LS1? I know the suspension has to be upgrated, any tips? i am new at this...

  19. #59
    Senior Member MadSeason's Avatar
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    Quote Originally Posted by rlerma
    All this information is very interesting, i just got a 2000 Camaro SS with 65,000 mlies. I am more interested in highway racing. I was testing it and went 155MPH, but how much faster can you go on an LS1? I know the suspension has to be upgrated, any tips? i am new at this...
    http://www.gmhightechperformance.com/features/0503htp_speed/ should interest you

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