Rpm VS Gears

[Nugz1012]

i was wondering about a few gears and what rpms i wud be turning between 65-80 mph. i was thinking of either 3.73 or 4.10's but after talkin to some ppl i was thinking as high as 4.56's. i go to school in IL and home is in KY so its about a 650 mile round trip to go home which is about 1 or 2 times a month. so i like to make good time. if anyone who has these gears and knows the rpms they turn between 65-80 mph id appreciate the info. this will be going into my 99 cobra if it makes a difference. Thanks

 

[BrookhavenTuner]

i believe 4.30 is the highest you can use and not crack 3k at 70mph.

 

[99cruisin]

this link will save you time and from getting flamed too much....http://www.svtoa-atlanta.org/cgi-bin/trans.cgi

the link above takes you to a gear chart. just put in your cars info.

 

[omj]

Go 4.56 or go home.

 

[frankt99cobra]

I found a gear chat in this fourm once it gave mph and rpm for all the gears ill see if i can locate it again it was called gear chart i have it on my copmuter but dont know how to get it in here

 

[frankt99cobra]

These calculations are for 25.5 inch tires with the D&D T56 6-Speed

RPM Chart Gear 60 mph 65 mph 70 mph 75 mph 80 mph 90 mph Ratios
2.97 1st
3.73 4th 2940 3200 3460 3680 3940 4440 2.07 2nd
6th .62 1823 1984 2145 2282 2443 2753 1.43 3rd
T45 5-Speed OD 5th .67 1970 2144 2318 2466 2640 2975 1.00 4th
0.80 5th
3.90 4th 3100 3340 3600 3860 4110 4610 0.62 6th
6th .62 1922 2071 2232 2393 2548 2858
T45 5-Speed OD 5th .67 2077 2238 2412 2586 2754 3089

4.10 4th 3240 3500 3780 4060 4300 4850
6th .62 2009 2170 2344 2517 2666 3007
T45 5-Speed OD 5th .67 2171 2345 2533 2720 2881 3250

4.30 4th 3400 3680 3960 4240 4510 5100
6th .62 2108 2282 2455 2629 2796 3162
T45 5-Speed OD 5th .67 2278 2466 2653 2841 3022 3417

4.56 4th 3600 3900 4200 4480 4800 5400
6th .62 2232 2418 2604 2778 2976 3348
T45 5-Speed OD 5th .67 2412 2613 2814 3002 3216 3618

MPH Chart 3.73 1st 2nd 3rd 4th 5th 6th

6800 RPM 46 67 97 138 173 223
5500 RPM 38 54 78 112 140 181
5000 RPM 34 49 71 102 128 165
4500 RPM 31 44 64 92 115 148
4000 RPM 27 39 57 81 101 131
3500 RPM 24 34 50 71 89 115
3200 RPM 22 31 45 65 81 105

MPH Chart 3.90 1st 2nd 3rd 4th 5th 6th

6800 RPM 44 64 92 132 165 213
5500 RPM 36 52 75 107 134 173
5000 RPM 33 47 68 97 121 156
4500 RPM 29 42 61 87 109 140
4000 RPM 26 38 55 78 98 126
3500 RPM 23 33 48 68 85 110
3200 RPM 21 30 43 62 78 100

MPH Chart 4.10 1st 2nd 3rd 4th 5th 6th

6800 RPM 42 61 88 126 158 203
5500 RPM 34 49 71 102 128 165
5000 RPM 31 45 65 93 116 150
4500 RPM 28 40 58 83 104 134
4000 RPM 25 36 52 74 93 119
3500 RPM 22 31 45 65 81 105
3200 RPM 20 29 41 59 74 95

MPH Chart 4.30 1st 2nd 3rd 4th 5th 6th

6800 RPM 40 58 84 120 150 194
5500 RPM 33 47 68 97 121 156
5000 RPM 30 43 62 88 110 142
4500 RPM 27 38 55 79 99 127
4000 RPM 24 34 50 71 89 115
3500 RPM 21 30 43 62 78 100
3200 RPM 19 28 40 57 71 92

MPH Chart 4.56 1st 2nd 3rd 4th 5th 6th

6800 RPM 38 55 80 114 143 184
5500 RPM 31 44 64 92 115 148
5000 RPM 28 40 58 83 104 134
4500 RPM 25 36 52 75 94 121
4000 RPM 23 32 47 67 84 108
3500 RPM 20 28 41 58 73 94
3200 RPM 18 26 37 53 66 85


3.73 3.90 4.10 4.30 4.56

35 punch "1st 5000
2nd 3500" 2nd 3600 3rd 2700 2nd 3900 3rd 2900 2nd 4100 3rd 3000 2nd 4400 3rd 3150

45 punch 2nd 4500 3rd 3200 2nd 4800 3rd 3300 2nd 5000 3rd 3500 2nd 5200 3rd 3700 2nd 5500 3rd 3900

55 Punch "3rd 3900
4th 2600" 3rd 4000 4th 3100 3rd 4300 4th 3000 3rd 4500 4th 3150 3rd 4800 4th 3300

65 Punch 3rd 4500 4th 3200 3rd 4800 4th 3400 3rd 5000 4th 3500 3rd 5200 4th 3700 3rd 5500 4th 3900

 

[frankt99cobra]

came up funky ill see if i can fix it or create a link

 

[Orange Stang 04]

650 mile round trip once to twice a month? I'm a HUGE fan of 4.56's, but that might be pushing it. Depends on what all you use the car for too. I love my 4.56's but I couldnt do many long trips with them. At 65 I'm at 2600 rpms. Not bad but if your doing like 80 or so the whole way home it might get annoying. The way the 4.56's pull is insane though, check out the videos i made, just search under my created threads, its called 3.27's vs. 4.56's

Edit: Here ya go http://videos.streetfire.net/video/d6152c43-a792-4997-9e02-99250134ae22.htm

 

[cobraboy169]

I have 4.10s in my 5 speed sn-95 and when I am doing 80 I am around 2600 rpm or so and at 90 mph I at at 3k. I have to drive 3 hours to get home to visit the family and freidns and I think the 4.10s are good enough for freeway driving. You can get some good pulling from them but still don't have to yell to your passanger to talk to them. But if I didn't drive on the freeway as much I woudl rather have 4.30s.

 

[01 Cobra]

mine runs about 3k @ 80mph with 4.30s.

 

[Nugz1012]

ya i would go 4.56's if i had a 6 speed i just dont think i cud put up with the drives home as much tho :\ with the 5 speed atm

 

[Nugz1012]

lol i was just watchin that video of the green cobra with the 4.56's a couple of days ago and it made me really want those gears ><

 

[Orange Stang 04]

lol i was just watchin that video of the green cobra with the 4.56's a couple of days ago and it made me really want those gears ><

Haha yeah, they are the sh*t. If its not a DD i would consider them if i was you,

 

[Nugz1012]

will a good street tire do fine with 4.30's or am i looking at gettin some dr's to hook with em? cuz atm i need new street tires and i think the highest i can go on stock rims r 275, just needin to know what else should be put on the wish list lol

 

[kxt]

remember most t56s have a similar 6th gear ratio to our 5th speed ratio. The viper spec t56 has the .5 6th gear ratio.

 

[hatsharpener]

http://www.f-body.org/gears/

 

[Nugz1012]

ya that just dawned on me yesterday when i was lookin up specs and i was askin a few friends and none wud give a clear answer. i saw that they were a close ratio and didnt know if it wud make a difference then since they r close

 

[Mustang4vSVT]

Go 4.30's. My buddies Mach does a tad under 3000rpm at 80. He has 18's which would make it lower. If ur running stock rims or any other 17 inch rim it might be at 3k for you

With my T56, 4.56's, and larger diameter rims (18's) im right at 3k at 80. Its not bad at all dude, you get use to it. IF traffic is really flowin ill be cruising at 3300 sometimes. its just 'wierd' to see ur tach that high, but there are cars that run 3500rpm's at 80 STOCK. Dont fear it man!!

 

[BrookhavenTuner]

but doesnt the PCM go in closed loop at 3k making the the MPG take a HUGE drop?

 

[Nugz1012]

i wud go 4.56's if i didnt have such a long trip home, the car will probly get em when i get settled after school but ya about that mpg all ive been hearing from my roommates r ur gas is gonna be shit. i figured since id still be runin close to the same rpms as i wud with stock gears just at a lower mph id be fine.