3.0, 3.73 speedo cable drive gear ? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 11-06-2008
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3.0, 3.73 speedo cable drive gear ?

was wondering if anyone had the same truck and knows what color my gear is. i have driven next to someone and figured out about my speed difference more or less (would like some advice on that to) but i have not taken it out and looked. Is this hard? i had 225 and now 32's with 3.73s soo just trying to get my speedo right, its about 8-10 mph off going 60 on my speedometer really im going about 69 sooo, need to change it or imma get a ticket. thanks for the advice and help!
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Old 11-06-2008
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No cable or gear on yours. It is driven from a sensor on the rear axle. The correction is done in an electronic module using a dealer tool.
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Old 11-06-2008
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really, i was on the ranger station and they sell these plastic gears for auto trannies to, soo i just assumed mine would work like that. where do i go to ford? thats going to be a pretty penny. and what do i ask for. thanks alot man
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Old 11-06-2008
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97 and earlier use the gears. 98~2000 are driven from the rear axle ABS sensor. 2001+ are driven from a transmission sensor.

If your 2000 truck has 4WABS, the correction is done in the 4WABS Module.
If it has Rear ABS only, the correction is done in the Generic Electronic Module (GEM),

A dealer can change it easily but you may have to supply the tire "revs/mile" from your tire manufacturer's website. As an example, my 31" BFG A/Ts are 677 revs/mile. Your 32" tires should have a slightly lower number.

I don't know how much they charge for that service. Any Ford dealer will have the special tool. A well equipped independent shop might also have it.
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Old 11-06-2008
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i wonder if i have 4abs or not, and what do you think the price is going to be for them to change that? i will look up the revs/mile on that tire. thanks so much for your help
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Old 11-06-2008
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4WABS will have a wire going to each front spindle but RABS will not. The price is whatever they want it to be. I would shop around.
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Old 11-06-2008
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Try this site. It will tell you the diff between the tire sizes.
Just plug in the old and the new size. If you can't find your
new tire size, just try to find one close to 32"
ex. 305/70 X 15 = 31.8" & 315/70 X 15 = 32.4"
That should get you in the ball park.

http://www.miata.net/garage/tirecalc.html
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Old 11-07-2008
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Be careful with "inch-size" tires. Contrary to logic, most run smaller than the number embossed on the sidewall. "32s" may actually be 31.4" or 31.7" or some other rolling diameter. There is even some variability among tire models from the same tire company. For greatest accuracy, it is best to look up the true revs/mile figure for your specific tire size and model on its manufacturer's website.
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Old 11-07-2008
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the best your gonna get from ford is 677rpm. your speedometer is still going to be off. and thats going to cost you 85-100 bucks

have you thought about re-gearing?

the only other option you have is to get a programmer at 400 bucks
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Old 11-07-2008
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yes i plan on regearing, wanted to put a 4.10, L/S 8.8 rear end in before i got these tires, but my tires are balddddddddddddddddddd, and unsafe even with some water from sprinklers on the road i get loose. is it tru that 4.10 gears will put me back withing a mph or so on my speedo with 32s? thanks
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Old 11-07-2008
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Yeah, carefull, I called ford about this, and they warned me its $100, and they can't guarantee my truck will even take the new numbers, and of course they charge you anyways.

I just never speed, cause I am always speeding.
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Old 11-07-2008
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Quote:
Originally Posted by ChicksDigIt View Post
is it tru that 4.10 gears will put me back withing a mph or so on my speedo with 32s? thanks
No. For 98~2000 ONLY, the vehicle speed is measured at the ring gear which runs at the same revs/mile as the tires. For these three model years, a change in tire diameter changes the speedometer reading but axle ratio doesn't.

Last edited by V8 Level II; 11-07-2008 at 02:48 PM.
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Old 11-07-2008
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Quote:
Originally Posted by 04 EDGE View Post
the best your gonna get from ford is 677rpm. your speedometer is still going to be off. and thats going to cost you 85-100 bucks

have you thought about re-gearing?

the only other option you have is to get a programmer at 400 bucks

2001+ Ranger PCM's have VID BLOCK that sets calibratable upper and lower limits for revs/mile. The VID BLOCK limits only allow for a range of revs/mile that match the stock combination of axle ratios and tire sizes that were originally available with the factory calibration.

An aftermarket PCM flash programmer can reset the speedometer calibration in a 2001+ because the speedo parameters are in kept the PCM.

A programmer wouldn't work on a 2000 though because it has the adjustment in a different module that the programmer cannot reach.

I believe that the OP's 2000 may have a wider range of adjustment available for revs/mile because the flash adjustment for the speedo cal is done in the other module which probably doesn't have anything like VID BLOCK.
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Old 11-07-2008
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once again i have been corrected by the master !

yeah i always get confused with the 2000-2001 stuff bob.

anyway the best ford could give me was 677 rpm. made it close with my 32's and stock 4.10's

after re-gearing to 4.56's now my speedometer is 7-10 mph FAST!!!

i am not sure if ford could change the gear ratio in my pcm via re-flash to 4.56
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Old 11-07-2008
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I believe that 4.56 is not allowed by VID Block since it is outside of the stock range of 3.55 to 4.10.

On the other hand, you might be able to fool it by using the revs/mile that correspond to a smaller tire size along with the 4.10 RAR.

225/70-15 tires were OE on base Ranger models for many years. Their 761 revs/mile along with 4.10 RAR should make your speedometer a lot closer to the 32's with 4.56.

677/761= .890
4.10/4.56 = .899

That would only be about a 1/2 MPH difference at 50 MPH.

Of course, that assumes that VID BLOCK in your PCM will allow that combination of revs/mile and RAR ... it might not depending on the equipment combinations that are covered by your truck's calibration.
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Old 11-07-2008
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bob can you re-crunch the numbers, i have 33's on it now, well 33's for the summer and 285-75-16's for the winter, there 32.8 inches
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Old 11-07-2008
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You could see if the cal will allow 721 revs/mile with 4.10 RAR. 721 corresponds to a 235/75-15, also a Ranger size for many years. Without a true spec, I would assume something like 635 revs/mile for the 33s.

635/721= .881
4.10/4.56 = .899

Gives about a 1 MPH difference at 50 MPH. Still not bad at all.
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