Non Lock Rpms

j l smith · Aug 21, 2017

285/40/17 so around 26''

j l smith · Aug 21, 2017

I might send the converter back and get it restalled but I'm not gonna go back to a lock up

General karthief · Aug 21, 2017

373 gear 1 to1 on 26" tires= 2687 rpms
Same setup with od = 2025 rpms
I'll have to do some research to find loss/gain in rpms with a 3500 stall converter.

mikestang63 · Aug 21, 2017

j l smith said:
as of right now I'm running a 323 gear and I'm thinking of putting a 373 in and was woundering about how many rpms I will be turning at 60mph

Go back and read my post again
Your answer is there

mikestang63 · Aug 21, 2017

j l smith said:
I might send the converter back and get it restalled but I'm not gonna go back to a lock up

Tell me why you are opposed to a lock up converter.
Did you convert to a 1 piece input shaft
Do you have a trans cooler
Stall speed is only one factor when considering a converter. Contact a good company like TCI or Edge and complete a spec sheet.

imp · Aug 21, 2017

j l smith said:
as of right now I'm running a 323 gear and I'm thinking of putting a 373 in and was woundering about how many rpms I will be turning at 60mph

@j I smith
This question was answered earlier. Note how fast your eng. is turning while cruising at steady throttle, then take 15% of that number, add it on, and there you have the eng. speed with 3.73 gears. This is all being made so much more difficult than it really is. imp

General karthief · Aug 21, 2017

What rpms at 60 mph with the gears you have now?

imp · Aug 21, 2017

karthief said:
373 gear 1 to1 on 26" tires= 2687 rpms
Same setup with od = 2025 rpms
I'll have to do some research to find loss/gain in rpms with a 3500 stall converter.

@karthief
Yes, if the coupling characteristics (i.e. stall speed) are changed, all other things remaining the same, eng. rpms at a given cruise speed will change; however, since the horsepower needed to keep the car moving at that speed remains the same, a different converter will "eat" more or less energy as heat, depending on it's characteristics. Compare to a locked converter, which is basically the same as a clutch, which has a "stall speed" of zero. imp

imp · Aug 21, 2017

j l smith said:
285/40/17 so around 26''

@ j I smith @karththief

285-40-17 tire has a calculated rolling diameter of nearly exactly 26". Makes 776 revolutions per mile, therefore 776 rpm at 60 mph. 776 X 3.23 = 2505 eng. rpm. @ 60- mph.

For 3.73 gears: 776 X 3.73 = 2894 eng. rpm @ 60 mph.

Note 60 mph = a mile a minute. imp

mikestang63 · Aug 21, 2017

imp said:
@ j I smith @karththief

285-40-17 tire has a calculated rolling diameter of nearly exactly 26". Makes 776 revolutions per mile, therefore 776 rpm at 60 mph. 776 X 3.23 = 2505 eng. rpm. @ 60- mph.

For 3.73 gears: 776 X 3.73 = 2894 eng. rpm @ 60 mph.

Note 60 mph = a mile a minute. imp

your calculations are wrong
An AOD has a .70 to 1 ratio in OD
no way are you doing 2900 rpm at 60 mph with 3.73's and a 26" tire in an AOD. I have that setup and at 60 it is more like 2000 rpm
I posted the correct rpm for 3.23 and 3.73 gears
just plug in the numbers here

http://spicerparts.com/calculators/transmission-ratio-rpm-calculator

General karthief · Aug 21, 2017

mikestang63 said:
your calculations are wrong
An AOD has a .70 to 1 ratio in OD
no way are you doing 2900 rpm at 60 mph with 3.73's and a 26" tire in an AOD. I have that setup and at 60 it is more like 2000 rpm
I posted the correct rpm for 3.23 and 3.73 gears
just plug in the numbers here

http://spicerparts.com/calculators/transmission-ratio-rpm-calculator

2025 rpms is what I came up with
1 to 1 was 2687 rpms using similar calculator
Will using a high stall converter like a 3500 cause higher rpms that a stock one at 60 mph?

mikestang63 · Aug 22, 2017

karthief said:
2025 rpms is what I came up with
1 to 1 was 2687 rpms using similar calculator
Will using a high stall converter like a 3500 cause higher rpms that a stock one at 60 mph?

no

imp · Aug 22, 2017

mikestang63 said:
your calculations are wrong
An AOD has a .70 to 1 ratio in OD
no way are you doing 2900 rpm at 60 mph with 3.73's and a 26" tire in an AOD. I have that setup and at 60 it is more like 2000 rpm
I posted the correct rpm for 3.23 and 3.73 gears
just plug in the numbers here

http://spicerparts.com/calculators/transmission-ratio-rpm-calculator

@mikestang63
Hold on! I'm calculating everything based on 1:1 driveshaft to eng. ratio! Sorry. I forgot we're talking a non -1:1 final driver. So, what is 0.7 of 2900? About 2000.

My apologies. imp

General karthief · Aug 22, 2017

mikestang63 said:
no

Hummm, I guess I need to learn more about converters, So what gear would j l smith be better off with the 323 or 373?
Lets guess that this is a street car since he didn't say.

CarMichael Angelo · Aug 22, 2017

A 3500 stall converter at steady speed will only stay there w/o load on the engine.... The car may cruise in a "no load" scenario at 2k, but that'll go straight to hell as soon as you step on the throttle. Depending on how loose that converter actually is, the engine speed could, and probably will flare to as high as 2700 RPM every time you put your foot in it to speed up.

I have a 2700 stall speed L/U 10" converter in my 4R70w. Same high gear ratio as your AOD. (.67) w/ 3.73's and a 315/17 rear tire

My test speed is higher than your's though,(70-75 mph) and there's a pretty good chance that my speedo is off a little.
When I lock up my converter in OD,..my RPMS drop to 2900-3k from about 3300 at a no-load steady state...But,....if the lock up is off....who knows where it goes when I stand on the throttle..

imp · Aug 22, 2017

madmike1157 said:
A 3500 stall converter at steady speed will only stay there w/o load on the engine.... The car may cruise in a "no load" scenario at 2k, but that'll go straight to hell as soon as you step on the throttle. Depending on how loose that converter actually is, the engine speed could, and probably will flare to as high as 2700 RPM every time you put your foot in it to speed up.

I have a 2700 stall speed L/U 10" converter in my 4R70w. Same high gear ratio as your AOD. (.67) w/ 3.73's and a 315/17 rear tire

My test speed is higher than your's though,(70-75 mph) and there's a pretty good chance that my speedo is off a little.
When I lock up my converter in OD,..my RPMS drop to 2900-3k from about 3300 at a no-load steady state...But,....if the lock up is off....who knows where it goes when I stand on the throttle..

@madmike 1157
We are remembering, I hope, that the AOD converter "lockup" is not controllable, as are the electronically shifted TCCs which I imagine 4R70W has. Moreover, the AOD converter is not in action at all in both 3rd. and 4th. (OD) gears. This is accomplished by having TWO input shafts from the converter; one drives 1st. and 2nd. gears, while the other, being driven by the converter housing (and thus the eng.) provides engine-to-transmission mechanical drive with no fluid converter action at all in 3rd. and 4th. gears. imp

CarMichael Angelo · Aug 22, 2017

imp said:
@madmike 1157
We are remembering, I hope, that the AOD converter "lockup" is not controllable, as are the electronically shifted TCCs which I imagine 4R70W has. Moreover, the AOD converter is not in action at all in both 3rd. and 4th. (OD) gears. This is accomplished by having TWO input shafts from the converter; one drives 1st. and 2nd. gears, while the other, being driven by the converter housing (and thus the eng.) provides engine-to-transmission mechanical drive with no fluid converter action at all in 3rd. and 4th. gears. imp

My 4vR 70w is completely manual. I control OD, and LU w/ a switch.

imp · Aug 23, 2017

madmike1157 said:
My 4vR 70w is completely manual. I control OD, and LU w/ a switch.

@madmike
But the lockup is solenoid-operated, is it not? The AOD is a non-electronic transmission, Ford's first real attempt at providing an overdrive automatic for rear-wheel drive. It was a reasonably staunch box, but not used universally. imp

CarMichael Angelo · Aug 23, 2017

imp said:
@madmike
But the lockup is solenoid-operated, is it not? The AOD is a non-electronic transmission, Ford's first real attempt at providing an overdrive automatic for rear-wheel drive. It was a reasonably staunch box, but not used universally. imp

I'm guessing that you are pointing out the difference between an AOD and my transmission, and not asking me what I'm using to make mine work.
There are still solenoids in there to actuate the LU in my transmission,..The switches that I toggle are tied to those. The rest of the transmission functionality is controlled through some old crotchedy vacuum modulator installed in place of the EC valve.
I never closely looked at the differences between the AOD/AODe, and my transmission...I sorta assumed that the AODe and 4R70w were similar in respect to the AODe being the less power capable transmission

imp · Aug 23, 2017

madmike1157 said:
I'm guessing that you are pointing out the difference between an AOD and my transmission, and not asking me what I'm using to make mine work.
There are still solenoids in there to actuate the LU in my transmission,..The switches that I toggle are tied to those. The rest of the transmission functionality is controlled through some old crotchedy vacuum modulator installed in place of the EC valve.
I never closely looked at the differences between the AOD/AODe, and my transmission...I sorta assumed that the AODe and 4R70w were similar in respect to the AODe being the less power capable transmission

Yeah, we're talking bananas and oranges. AOD was mechanical, but featured no torque converter action in 3rd. & 4th. gears only. AODE was electronically controlled, shared some components with AOD, but none of the important ones. 4R70W was a revised version of AODE introduced in 1993 in Lincoln Mark VIII.

What might be of value to you in particular is that units used with 5.4 eng. featured stronger gears. imp

Non Lock Rpms

j l smith

Member

j l smith

Member

General karthief

wonder how much it would cost to ship you a pair

mikestang63

mikestang63

imp

Mustang Master

General karthief

wonder how much it would cost to ship you a pair

imp

Mustang Master

imp

Mustang Master

mikestang63

General karthief

wonder how much it would cost to ship you a pair

mikestang63

imp

Mustang Master

General karthief

wonder how much it would cost to ship you a pair

CarMichael Angelo

my rearend will smell so minty fresh,

imp

Mustang Master

CarMichael Angelo

my rearend will smell so minty fresh,

imp

Mustang Master

CarMichael Angelo

my rearend will smell so minty fresh,

imp

Mustang Master

Similar threads

Non Lock Rpms

Member

Member

wonder how much it would cost to ship you a pair

Mustang Master

wonder how much it would cost to ship you a pair

Mustang Master

Mustang Master

wonder how much it would cost to ship you a pair

Mustang Master

wonder how much it would cost to ship you a pair

my rearend will smell so minty fresh,

Mustang Master

my rearend will smell so minty fresh,

Mustang Master

my rearend will smell so minty fresh,

Mustang Master

Similar threads

Privacy & Transparency

Privacy & Transparency