AOD owners with 4.10s

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koss1000

New Member

Aug 5, 2004

22

0

1

N.Nevada

Aug 20, 2004

#1

• Aug 20, 2004

• #1

Id like to know what kind of RPMs you guys are pulling driving a AOD with 4.10s on the highway say 65mph...


tnx
john

 

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tjm73

Founding Member

Aug 3, 2000

2,418

2

48

Rush, NY

Aug 20, 2004

#2

• Aug 20, 2004

• #2

AOD has 0.68 overdrive gear. At 65 mph with 26" tires you would be looking at roughly 2400 rpm.

To figure it out for yourself iwht other variables the formula is....

(Gear Ratio X MPH) Divided by Tire Diameter. Then multipy that by 336 (it's a constant). That is your RPM at the choosen MPH value. Round the RPM up as their will be slight variation in RPM.

Don't forget that gear ratio in overdrive is your rear gear times the OD gear ratio. In this example it's 4.10 X 0.68 which = 2.79


4.10's and an AOD are a match made in heaven.

 

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88mustang_5.0sb

New Member

Mar 8, 2004

40

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0

Solvang, CA

Aug 20, 2004

#3

• Aug 20, 2004

• #3

How about in a 5spd? Is 5th gear taller in the 5spd than 4th is in the AOD? I have the stock 2.73 gears in my 5spd and am wondering what the best upgrade would be.

 

T

tjm73

Founding Member

Aug 3, 2000

2,418

2

48

Rush, NY

Aug 20, 2004

#4

• Aug 20, 2004

• #4

88mustang_5.0sb said:

How about in a 5spd? Is 5th gear taller in the 5spd than 4th is in the AOD? I have the stock 2.73 gears in my 5spd and am wondering what the best upgrade would be.

Click to expand...

Nope. AOD has 2.46/1.46/1.00/.068 gears (1st through 4th respectivly) and hte T5 has 3.35/1.98/1.34/1.00/.067 (1st through 5th respectivly). Now the T5 has a couple small variations in gear ratios over the years. But nothing drastic.

See this thread from the Classic section for more info on tranny ratios.....at the start of the thread there is a bunch of tranny ratio info.
http://forums.stangnet.com/showthread.php?t=492026

 

Michael Yount

Mustang Master

Apr 10, 2002

9,039

6

79

Charlotte, NC

Aug 20, 2004

#5

• Aug 20, 2004

• #5

It's easy to figure out - if you have stock 2.73's and you want to go to 4.10's, your rpm will increase in direct proportion with the ratio of the gears. 4.10/2.73=1.50. A 50% increase in rpm (HUGE difference). So, if now you're turning over 1600 rpm at 60 mph, then with 4.10's you'll be turning over 50% faster - 2400 rpm. You can use the same math to compare 3.73's, 3.55's, etc. Others may tell you their rpm, but as pointed out above, that can vary from car to car with tranny, tire size, etc. This math will work for your car no matter what size tires you have on it or what type tranny - provided of course that your tach and speedo are accurate.

 

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MUSTHAVE302

Founding Member

Oct 18, 2002

96

1

0

Aberdeen, md

Aug 20, 2004

#6

• Aug 20, 2004

• #6

for the AOD, don't forget to take into account a lockup vs. non-lockup converter. the 2400 rpm may be right w/ a lockup converter, but w/ a non-lockup, you may be looking at closer to 2600.

 

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tjm73

Founding Member

Aug 3, 2000

2,418

2

48

Rush, NY

Aug 20, 2004

#7

• Aug 20, 2004

• #7

MUSTHAVE302 said:

for the AOD, don't forget to take into account a lockup vs. non-lockup converter. the 2400 rpm may be right w/ a lockup converter, but w/ a non-lockup, you may be looking at closer to 2600.

Click to expand...

That's right! I forgot about that lock-up/non-lock-up info.

 

Michael Yount

Mustang Master

Apr 10, 2002

9,039

6

79

Charlotte, NC

Aug 20, 2004

#8

• Aug 20, 2004

• #8

The biggest differences on the T-5's are that some have a 2.95 first gear instead of a 3.35; and some have a .625 5th instead of the .67....

 

PhLoBuS

New Member

Aug 15, 2004

473

0

0

Beverly, MA

Aug 20, 2004

#9

• Aug 20, 2004

• #9

very soon im ordering 4.10s for my auto... I have been reading everywhere and It says that 4.10s are overall the best for autos

 

K

koss1000

New Member

Aug 5, 2004

22

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1

N.Nevada

Aug 20, 2004

#10

• Aug 20, 2004

• #10

You will love them but then get a stall converter lock up and set it up to your cam you will get some ba launches

 

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tjm73

Founding Member

Aug 3, 2000

2,418

2

48

Rush, NY

Aug 20, 2004

#11

• Aug 20, 2004

• #11

koss1000 said:

You will love them but then get a stall converter lock up and set it up to your cam you will get some ba launches

Click to expand...

Yes a stall convertor AND shift kit. It will TOTALLY change the nature of your car.

 

rsw007

New Member

Jul 7, 2004

469

1

0

Lexington,SC

Aug 20, 2004

#12

• Aug 20, 2004

• #12

4.10+shift kit+converter= watch out 5 speeds

 

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K

koss1000

New Member

Aug 5, 2004

22

0

1

N.Nevada

Aug 20, 2004

#13

• Aug 20, 2004

• #13

whats your stall and what do you have for a rear end? You pretty much have what I have. But alot more mods to come. 4.10s with 3000 stall here (aod)

 

PhLoBuS

New Member

Aug 15, 2004

473

0

0

Beverly, MA

Aug 20, 2004

#14

• Aug 20, 2004

• #14

How does the stall converter work on your aod? do you hold the brake and then rev it up and go? or what? let me know!!

 

willys1

Active Member

Dec 2, 2003

1,004

1

36

New Jersey

Aug 20, 2004

#15

• Aug 20, 2004

• #15

I have 410's with a lock up conv.,and drive 124 miles a day round trip to work.At 2500rpm Im doing 72mph,and get 21mpg on the highway BUT,,,My stang was 2 tenths quicker in the 1/4 with my 373's

 

jwzg

Member

Apr 6, 2004

237

0

16

Prattville, AL

Aug 20, 2004

#16

• Aug 20, 2004

• #16

If you're going to rebuild the transmission, use a wide ratio gearset and 3.55's. Then you'll have the same overall first-gear ratio as if you were running 4.10's with the stock tranny and won't take it in the shorts on highway gas mileage and engine wear.