I am contemplating having 3.55 or 3.73 gears
installed in my 95 F-150 with AODE/5.0.
What would be necessary to make my speedo correct? Thanks

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1995 F-150XL 302/AODE JBA Headers/Cat-Back 2 1/4" No Muffler,
K&N Filter, Eagle Alloy Wheels, Spray in Bedliner, Etc..

 

Bulk,

Try this formula: # of teeth on old gear X new gear ratio = # of teeth no new gear. It should either be a purple 21 tooth gear or a white 23 tooth gear. You can get them froom Steeda. Best of luck!

WarEagle

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98 F150 Lariat extended cab, Pacific Green/Silver Frost,
Grey Leather Capt chairs, AM/FM/Cass/6-cd changer,
full tint, color matched bug deflector, vent shades,
A.R.E. hard bed cover, Ultra type 50 polished wheels,
BF Goodrich 315 55R x 16 Sport Truck Radial T/As, 4.6L,
AT, Towing Package, Airaid, Superchip, JBA headers,Flowmaster dual
exhaust, Flowmaster 50 series muffler, 4.10 gears

 

There is nothing to do as the speed is read off a ring on the diff... it always reads the same doesn't nmater if you have 1.1:1's or 6.50's the speedo will be calibrated correctly.

 

The spedometer cable in pre 1999 models is run from the rear of the transmission via a drive gear (either 7 or 8 tooth) and a reduction or driven gear. Changing the number of teeth on this driven gear calibrates the speedometer for things like tire size or gear change. When I changed from 3.55 to 4.10 I had to go from a 16 tooth gear to a 23 tooth gear to recalibrate the speedometer. Go to www.ring-pinion.com and check it out!

WarEagel

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98 F150 Lariat extended cab, Pacific Green/Silver Frost,
Grey Leather Capt chairs, AM/FM/Cass/6-cd changer,
full tint, color matched bug deflector, vent shades,
A.R.E. hard bed cover, Ultra type 50 polished wheels,
BF Goodrich 315 55R x 16 Sport Truck Radial T/As, 4.6L,
AT, Towing Package, Airaid, Superchip, JBA headers,Flowmaster dual
exhaust, Flowmaster 50 series muffler, 4.10 gears

 

Hate to continually seem like a schmuck about this, but a 1995 F-series TRUCK does not have a speedo cable, it is all electronic. The 97-98 trucks also do not have cables but they use the old style VSS which bolts to the tranny. The 92 thru 96 and 99 thru present light duties and 92 thru present heavies all use a tone ring mounted next to the ring gear in the differential in the rear axle. I am a ford tech I have replaced many rear axle sensors. As long as he doesn't change tire size he will not need to recalibrate squat. IF he changes tire size he will need to ground the PSOM wire and set the proper number for speedo correction into the PSOM's display.
War, you have a 98, one of only two years that the older style VSS was used. Your truck still doesn't have a cable driven speedo however. Don't believe me? crawl under and look.

 

I hate to disagree, but - I changed the gears on my 99 Expedition 4X4 from 3.55 to 4.10 and confidently predicted that the speedo would still be correct since I understood it reads of the ring gear.

After getting the truck back, I found that the speedo is now off by about 15%. The only solution now seems to be the dealer or Superchip.

Does anyone know where the speedo is read from? There definitely is not a VSD on the transfer case.

BTW, the change in gears was worth every penny.

Ian

 

Bulk,

What I found when I crawled under my truck was what appeared to be a speedometer cable attached to a plastic gear that went into the nose of the tranny. I took that gear out and replaced it with a gear with 23 teeth. My speedometer went from about 20 mph off to within 1 mph on a dyno. This might not have been a speedometer cable but it damn sure fixed my truck!

WarEagle

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98 F150 Lariat extended cab, Pacific Green/Silver Frost,
Grey Leather Capt chairs, AM/FM/Cass/6-cd changer,
full tint, color matched bug deflector, vent shades,
A.R.E. hard bed cover, Ultra type 50 polished wheels,
BF Goodrich 315 55R x 16 Sport Truck Radial T/As, 4.6L,
AT, Towing Package, Airaid, Superchip, JBA headers,Flowmaster dual
exhaust, Flowmaster 50 series muffler, 4.10 gears

 

That only works for 97 & 98's. 99's up don't have the VSD on the transfer case.

 

Ian, what is the build date on your Expy? I read somewhere where early build 99's MAY have VSS's yet? Anyway, I's be glad to preprogram the speedo for you, but.. I am in Iowa.
War, you saw the convolute tubing surrounding the wires that lead to the VSS. Yes, it has a gear. Yes that is how you change the speedo on it. But, your speedo IS ELECTRONIC.

 

Ok, I have a 2000 F150 4x4. I changed the gears from 3.55 to 4.10's(I think 4.56's would have been better). Anyway, my speedo is now 14% off, if this can be corrected please explain how and/or in what service manual can I find this "how to"

Iseejets

 

I checked the VSS, believe me. I have a shop manual subscription for the 98 Expy since ALLDATA doesn't have one for a 99 and I spent a couple of hours trying to find the VSS where the manual indicates it belongs. The plug is there on the tailshaft but it is not machined.

I have ordered a superchip flip chip from Mike at Superchips. He says he can correct for the gearing. Will let you know how it works out.

NoMopar - Thanks for the offer - how would you make the correction?

Ian


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99 Expedition EB
5.4l, 4x4, 4.10'S
WMS Tube, Bassani Cat Back Exhaust.
Superchip Flipchip on Order

 

nomopar, if I get smaller wheels and tires, would you be willing to change my spedo gear, so i'm not putting miles on the speedo that I shouldn't be. I live in Chariton, IA. Send me you e-mail address if you are interested. Mine is ericr@mhbank.com

 

IAN, I made a boo boo, the 99/00's are read off of a sensor on the trans or transfer case, which is a reluctor type. the only way I know of to modify it is to reprogramme the PCM to accept the gear change. it is a simple task that ANY dealer worth his salt can do. but I have to warn you we cannot go much larger on tire size. The PCM will only acccept tire sizes that are under acertain size (680 revolutions per mile I think it is)

screw, i'll e-mail you soon.

 

I called a few dealers. The only one that was any help says the best they can do is to set up the lowest gearing available on the truck ie 3.73's with 16" wheels. This would be closer but still out a bit.

I also looked at the possibility of using a corrector to bring it in line, but I would have to buy two of them because it reads off the transfer case sensors and any difference engages the transfer case, so I would be driving in 4x4 all the time.

This is an old post. To bring you up to date, I got the flip chip from Mike and it seems to be right on. So I'm happy.

Ian


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99 Expedition EB
5.4l, 4x4, 4.10'S
WMS Tube, Bassani Cat Back Exhaust, Superchip Flipchip