Reprogram for new rear gear?

O'Rattlecan · Jan 30, 2008

So I know there is a speed sensor on the rear differential. I was thinking about swapping out gears to a 3.73 if I can muster up the knowledge and guts to learn how. If I were to put in the 3.73 gears, is there a way to reprogram the computer to make speedometers read correctly? In the same swoop, would there be a way to program the size of the tire also (since it is not stock)?

Ryan

blacksnapon · Jan 30, 2008

On the newer ones, you can program tire size into the modules, but I'm not sure how far back that goes.

Skandocious · Jan 30, 2008

Yes sir. You'll need to recalibrate the [appropriately named] PSOM (programmable speedometer/odometer module). There's a specific procedure which involves pushing the Trip/Mode buttons on your dash in a certain sequence to calibrate it to counter the effects of a non-stock tire size. However, changing your gearing won't effect the speedometer, only a change in tire size will

EDIT: Found the procedure:
http://ford.off-road.com/ford/bigbr...Broncos/ArticleStandard/Article/detail/198381

Hey and what do ya' know, the first paragraph says EXACTLY what I just said. Man I'm smart

Blue Goose · Jan 30, 2008

Skandocious said:
Yes sir. You'll need to recalibrate the [appropriately named] PSOM (programmable speedometer/odometer module). There's a specific procedure which involves pushing the Trip/Mode buttons on your dash in a certain sequence to calibrate it to counter the effects of a non-stock tire size. However, changing your gearing won't effect the speedometer, only a change in tire size will

EDIT: Found the procedure:
http://ford.off-road.com/ford/bigbr...Broncos/ArticleStandard/Article/detail/198381

Hey and what do ya' know, the first paragraph says EXACTLY what I just said. Man I'm smart

mrfixit · Jan 30, 2008

Ahh the old days, when all ya had to do was put a new speedo drive gear in the tail of the tranny....

Skandocious · Jan 30, 2008

mrfixit said:
Ahh the old days, when all ya had to do was put a new speedo drive gear in the tail of the tranny....

Lol that wasn't THAT long ago. Pre 93 that was how they did it, before the turned the RABS sensor into a multifunction RABS/VSS.

But cmon, this method is better anyways, you don't have to buy any parts or dissemble anything!

Brian_B · Jan 30, 2008

mrfixit said:
Ahh the old days, when all ya had to do was put a new speedo drive gear in the tail of the tranny....

Yeah...$5 and 5 minutes and you were done. One bolt to remove the clip.

I hate this new stuff. LOL

mrfixit · Jan 30, 2008

...but you could TELL the guy behind the parts counter what gear ratio you put IN , any tire size changes etc and he'd hand you the solution. No second-guessing.

Brian_B · Jan 30, 2008

No fancy scanner or re-programmer needed!

d-kuzmen · Jan 31, 2008

Brian_B said:
Yeah...$5 and 5 minutes and you were done. One bolt to remove the clip.

I hate this new stuff. LOL

Only takes 5 min with the scan tool too, just costs $105!! :rofl:

Nothings cheap and easy anymore.

6L PWR · Jan 31, 2008

d-kuzmen said:
Nothings cheap and easy anymore.

I am, and from my understanding, so is Tony. Hey Tony, you cheap and easy too?? 'smiliepig'

Skandocious · Jan 31, 2008

I am! Count me in Todd

Gunner · Jan 31, 2008

mrfixit said:
Ahh the old days, when all ya had to do was put a new speedo drive gear in the tail of the tranny....

Ahhh the even OLDER days.............when you just drove it and guessed

Gunner

Gunner · Jan 31, 2008

6L PWR said:
I am, and from my understanding, so is Tony. Hey Tony, you cheap and easy too??

Well I'm not EASY, but I CAN be tricked............Ask my wife

Gunner

6L PWR · Jan 31, 2008

Gunner said:
but I CAN be tricked............Ask my wife

Gunner

You fall for the old "I've got a headache huney." line??

Blue Goose · Jan 31, 2008

Ahem,..... smiliehijacked

Skandocious · Jan 31, 2008

Lol, all these replies and Ryan hasn't said a word.... No thanks or NOTHIN.

mrfixit · Jan 31, 2008

Question was asked and answered; anything after that is fallout!

O'Rattlecan · Feb 1, 2008

been busy myself... Sorry.

I was just considering the gears as a way to make up for the slightly bigger and heavier tires I put on, plus a little extra kick when I'm putting around town. It's good to know that won't throw off the speedo.

Ryan

89frankenford · Feb 2, 2008

speaking of speedo gears and stuff, does anybody know where i can get a new speedo gear that will adjust my speedo to compensate the 33" tires i have? i KNOW its off.

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