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Old 01-07-2014, 03:11 AM   #1
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Gear install (finally)

Finally looking at the potential of getting my 4.10s installed that have been sitting new in the box for over a year. What speedo will I need to correct the speedometer/odometer? The car does get a calibrated inspection so it needs to be accurate.
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Old 01-07-2014, 08:33 AM   #2
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Finally looking at the potential of getting my 4.10s installed that have been sitting new in the box for over a year. What speedo will I need to correct the speedometer/odometer? The car does get a calibrated inspection so it needs to be accurate.

Just go into your handheld tuner and switch the rear gear to 4.10. The tuner will automatically fix the speedo.
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Old 01-07-2014, 08:55 AM   #3
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Mines off by 10
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Old 01-07-2014, 08:57 AM   #4
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Quote:
Originally Posted by ColeJohnson

Just go into your handheld tuner and switch the rear gear to 4.10. The tuner will automatically fix the speedo.
It doesn't work that way on earlier cars. You have to pick up a different speedo gear to correct it
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Old 01-07-2014, 09:06 AM   #5
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speedo gear - LatemodelRestoration.com Search
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Old 01-07-2014, 09:39 AM   #6
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Is upgrade to 31 spline axles and upgrade your diff while your there
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Old 01-07-2014, 02:53 PM   #7
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It doesn't work that way on earlier cars. You have to pick up a different speedo gear to correct it
Not for 4.10s, the highest you can properly correct for with the 8 tooth drive gear in 1990+ cars is 3.27s with the red 21 tooth gear. 1989 and before had a 7 tooth drive gear which is good till 3.73s or you can pull the tailshaft and install a 6 tooth.

Anyway, none of that matters because the 94-up cars use electronic speedos which means you just get a speedcal and calibrate for anything.
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Old 01-07-2014, 05:21 PM   #8
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Got my tuner from American muscle and it took car of my speedo when I got 4.10's
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Old 01-07-2014, 05:28 PM   #9
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Just got a 4.10 tune can not wait to buy the rebuild kit and gears.
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Old 01-07-2014, 05:47 PM   #10
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Quote:
Originally Posted by scottydsntknow

Not for 4.10s, the highest you can properly correct for with the 8 tooth drive gear in 1990+ cars is 3.27s with the red 21 tooth gear. 1989 and before had a 7 tooth drive gear which is good till 3.73s or you can pull the tailshaft and install a 6 tooth.

Anyway, none of that matters because the 94-up cars use electronic speedos which means you just get a speedcal and calibrate for anything.
Hm, didn't realize that. Guess I won't be correcting my 90 afterall because the 4.10's aren't going anywhere.
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Old 01-07-2014, 06:19 PM   #11
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Hm, didn't realize that. Guess I won't be correcting my 90 afterall because the 4.10's aren't going anywhere.
You'll see a lot of crap about the 23 tooth gear. 1-it only "corrects" to 3.55s and 2- its not a Ford mesh. Its a Chrysler mesh and will get chewed up in a T-5.

Only way to correct for 4.10s in the 90 is to pull the tailshaft, put on a 6 tooth drive gear and then I forget but I think its the black 20 tooth driven gear for stock tire diameter.
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Old 01-07-2014, 06:24 PM   #12
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Quote:
Originally Posted by scottydsntknow

You'll see a lot of crap about the 23 tooth gear. 1-it only "corrects" to 3.55s and 2- its not a Ford mesh. Its a Chrysler mesh and will get chewed up in a T-5.

Only way to correct for 4.10s in the 90 is to pull the tailshaft, put on a 6 tooth drive gear and then I forget but I think its the black 20 tooth driven gear for stock tire diameter.
Mine is an aod, hence the 4.10's
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Old 01-08-2014, 12:23 AM   #13
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Ok I know tuner only won't work on this year (97) and would loved to have known that prior. So am I understanding that there is no way to change to an accurate speedo to accommodate 4:10 gears?

---------- Post added at 03:23 PM ---------- Previous post was at 03:18 PM ----------

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Is upgrade to 31 spline axles and upgrade your diff while your there

Upgrades like that are desirable but not realistic overseas. Shipping is a pain and most companies (AM included) won't ship to military addresses for free which creates a significant and undesirable addition to price.
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Old 01-08-2014, 03:03 AM   #14
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Tuner can work depending on which. Sct could calibrate it fron what i remember however diablosport wont
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Old 01-08-2014, 03:05 AM   #15
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I'm using the Bama Tunes from AM but hearing that the 97 is one of those years that can't be calibrated that way.
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Old 01-08-2014, 07:13 AM   #16
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I'm using the Bama Tunes from AM but hearing that the 97 is one of those years that can't be calibrated that way.
Like I said in an earlier post, get a speedcal. Buy one, wire it in per the instructions, look at your gear ratio and get your setting for the switches (will be binary like 01011100111 or something). Set them to whatever you are running and boom, accurate speedo. My 98 is dead nuts accurate with 3.73s confirmed with GPS.
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Old 01-08-2014, 07:37 AM   #17
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Like I said in an earlier post, get a speedcal. Buy one, wire it in per the instructions, look at your gear ratio and get your setting for the switches (will be binary like 01011100111 or something). Set them to whatever you are running and boom, accurate speedo. My 98 is dead nuts accurate with 3.73s confirmed with GPS.
aint that like 100$?
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Old 01-08-2014, 07:44 AM   #18
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aint that like 100$?
Well yeah they arren't free...
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Old 01-08-2014, 07:47 AM   #19
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Well yeah they arren't free...
I almost bought one when I did mine, but it was 100$, but I got the gear for free, and I just moved my needle a little
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Old 01-08-2014, 07:55 AM   #20
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Well if that's good for you then whatevs but if its the white gear its currently getting chewed up and shooting little plastic bits all through your transmion. $100 for a speedcal and then never having to worry about your speedometer again is worth it IMO. Get a new set of gears or a new tire size just pull the shifter bezel, pop the lid off the box, move a few swtiches, button back up and go.
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Old 01-08-2014, 04:48 PM   #21
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Like I said in an earlier post, get a speedcal. Buy one, wire it in per the instructions, look at your gear ratio and get your setting for the switches (will be binary like 01011100111 or something). Set them to whatever you are running and boom, accurate speedo. My 98 is dead nuts accurate with 3.73s confirmed with GPS.

Thank you. "Accuracy" was what I wanted to hear. I'm in Japan and they speed test cars here every year.
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Old 01-08-2014, 05:36 PM   #22
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I don't know how to do this step by step. To adjust tuner to 4.10 gears you adjust axle ratio on tuner @810 revs/miles
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Old 01-08-2014, 06:22 PM   #23
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I don't know how to do this step by step. To adjust tuner to 4.10 gears you adjust axle ratio on tuner @810 revs/miles
Well that's if you are running stock tire size. You can use this calculator to compare other tire sizes your tire size and it tells you EXACTLY what revs per mile you will be getting with your tire size. Example is a car running 285/35/18s would be 804 so you'd have to do more math than that.

Now, Dallas Mustang makes this easy with their speedcal charts which are right below the actual product instructions. But if you have a non stock tire diameter (stock is 245/45/17 on 94-04 cars minus the 94/95 Cobra which was 255/45/17) you will need to do more math like I said.
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Old 01-09-2014, 05:14 PM   #24
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Well that's if you are running stock tire size. You can use this calculator to compare other tire sizes your tire size and it tells you EXACTLY what revs per mile you will be getting with your tire size. Example is a car running 285/35/18s would be 804 so you'd have to do more math than that.

Now, Dallas Mustang makes this easy with their speedcal charts which are right below the actual product instructions. But if you have a non stock tire diameter (stock is 245/45/17 on 94-04 cars minus the 94/95 Cobra which was 255/45/17) you will need to do more math like I said.
Your right, it isn't that simple of a explanation. It requires some math. My tuner gave me them numbers and they are for stock tires. The external circumference of my tires are almost equal to stock. I guess he decided less than 1% is equal. The great part about being wrong is, I learn something new. Appreciate the input
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Old 01-10-2014, 07:27 AM   #25
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Stock tire diameter means that the speedometer is expecting 8,000 pulses per minute. The actual VSS sent signal on a stock application is 7861 which means the stock speedo is going to be 2% off right from the factory so I would not be worried about 1% at all.

I have a website saved on my Chrome favorites (work computers have failternet exploder) that I can link when I get home which will spit out speedcal dipswitch settings for any tire size or gear ratio and can even give you the correct settings for an extended range speedcal if you put an OSS trans in a VSS car or vice versa.
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Old 01-10-2014, 09:48 PM   #26
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Those guys who are riding around with their speedos uncorrected are just cheating themselves. You're just racking up false mileage and if you decide to sell your vehicle nobody will believe you when tell them those aren't the right Miles. You will be forced to take a loss (no matter how minimal). The longer you wait the worse its gonna be.
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Old 01-10-2014, 10:43 PM   #27
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Those guys who are riding around with their speedos uncorrected are just cheating themselves. You're just racking up false mileage and if you decide to sell your vehicle nobody will believe you when tell them those aren't the right Miles. You will be forced to take a loss (no matter how minimal). The longer you wait the worse its gonna be.
On a digital odo equipped car yeah... However its not super drastic. Value is not going to decrease if the odo says 120k and its really 108k or whatever.
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