th400 question

[AjSmoker]

what rpm at 60 mph with witch gear and tire

[2002CAMAROSSLS1T56]

um..10!
WTF are you talking about.

[AjSmoker]

simple ? if u r doing 60 mph and have a th400 what is your rpm

[2002CAMAROSSLS1T56]

depends on rear gear and tire.

Here you figure it out yourself:

Rear Gear X 355 X MPH / Tire Diameter = RPM

[pddye]

I think i'm somewhere around 3000 rpm at 65mph with 3.73 rear, 28"tire, and 3000 stall converter.

[AjSmoker]

anyone else

[ajw2500hd]

f**k th400 for street car assssssss!!!

[Cobra R]

RPM calculator

http://www.richmondgear.com/streetcalculators.html

Dont stay up all night

[ajw2500hd]

good god at 70 mph its 3444 rpms great for a car that never never goes to the track hahaha whats wrong with build 4l60

[Z28/2002]

If you posted what size tire and what gear then you might get some people chiming in

[nprather]

they still break....im prob goin th400

[ajw2500hd]

he has 28 inch tires with 4:10s now but he will be going with 3:73 with auto. but his cam is big so he needs that 4:10

[WE TODD DID]

Its going to be the same as most any other transmission. 3rd gear is 1-1.

[Z28/2002]

Here is what the MPH will be at any given RPM up to 7K. This is for a TH400 with a 28" tall tire, 3.73 gears and stock TH400 gear ratios


RPM 1st 2nd 3rd
500 5 8 10
600 5 9 12
700 6 11 14
800 7 12 16
900 8 14 18
1000 9 15 20
1100 10 17 22
1200 11 18 24
1300 12 20 26
1400 13 21 28
1500 14 23 30
1600 14 24 32
1700 15 26 35
1800 16 27 37
1900 17 29 39
2000 18 30 41
2100 19 32 43
2200 20 33 45
2300 21 35 47
2400 22 36 49
2500 23 38 51
2600 23 39 53
2700 24 41 55
2800 25 42 57
2900 26 44 59
3000 27 45 61
3100 28 47 63
3200 29 48 65
3300 30 50 67
3400 31 51 69
3500 32 53 71
3600 32 54 73
3700 33 56 75
3800 34 57 77
3900 35 59 79
4000 36 60 81
4100 37 62 83
4200 38 63 85
4300 39 65 87
4400 40 66 89
4500 41 68 91
4600 41 69 93
4700 42 71 95
4800 43 72 97
4900 44 74 99
5000 45 75 102
5100 46 77 104
5200 47 78 106
5300 48 80 108
5400 49 81 110
5500 50 83 112
5600 50 85 114
5700 51 86 116
5800 52 88 118
5900 53 89 120
6000 54 91 122
6100 55 92 124
6200 56 94 126
6300 57 95 128
6400 58 97 130
6500 59 98 132
6600 59 100 134
6700 60 101 136
6800 61 103 138
6900 62 104 140
7000 63 106 142

[pddye]

I wouldn't go any other way then my th400. Heck with that 4l60e

[Goldfinger911]

What factor did you use for the calculations? Those numbers dont look right. I think it is supposed to be 336.136. A previous post said 355 which I am pretty sure is incorrect.

(Rear end) x (336.136) x (speed) / (tire diameter)

Originally Posted by Z28/2002

Here is what the MPH will be at any given RPM up to 7K. This is for a TH400 with a 28" tall tire, 3.73 gears and stock TH400 gear ratios


RPM 1st 2nd 3rd
500 5 8 10
600 5 9 12
700 6 11 14
800 7 12 16
......
6600 59 100 134
6700 60 101 136
6800 61 103 138
6900 62 104 140
7000 63 106 142

[Z28/2002]

Here is what I used. Plugged in 28" tire, 3.73 gears and the stock TH400 gear set (2.48, 1.48, 1.1)

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

[big wally 55]

Originally Posted by WE TODD DID

Its going to be the same as most any other transmission. 3rd gear is 1-1.

But there is no lockup converter , so rpm will be a little higer than a 4l60e in third .

[spaz1]

Originally Posted by ajw2500hd

good god at 70 mph its 3444 rpms great for a car that never never goes to the track hahaha whats wrong with build 4l60

Nothing is wrong with 4l60e but the 400 is 10 times stronger and costs 1/2 to build.

[2002CAMAROSSLS1T56]

Originally Posted by Goldfinger911

What factor did you use for the calculations? Those numbers dont look right. I think it is supposed to be 336.136. A previous post said 355 which I am pretty sure is incorrect.

(Rear end) x (336.136) x (speed) / (tire diameter)

I use 355 for an unlocked converter, and 336 for a manual trans or locked converter.
I don't know how you would or why you'd need to get a closer guesstimate.