speedometer off
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More Turbo
Joined: Jan 2010
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From: Western NC mountains
speedometer off
So using my gps my speedo reads ~5mph fast. Mine is driven off of tcase. Dont remember gear color or teeth count. 235s 4:10 zf5. Can i change just gear on cable end or do i have to change worm drive gear?
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I put bigger tires on and it was right. I don't think you have to change the worm gear I did a 4.10 and 3.55 a couple years ago and they had the same worm gear it's either brown or yellow the gears are color coded
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with the digital speedo there is suppose to be an dial on the back of the instrument cluster, but I've never cared enough to look.
i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
yup, all you need to change is the cable gear . i have used red,yellow, green and white gears in my 88. 1 tooth is good for about a 2.5 mph change in speedo reading.
i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
pre 91 is simply changing the gear on the cable, 92 and newer is electronic and reads off the VSS in the rear differential.
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Posting Guru
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From: western washington
the cable and gear are for the speedometer and odometer, the vss converts information to electrical signals for the E4OD PCM, ALL VEHICALS with E4OD have a vss on tranny or when they went digital used the same sensor for anti lock, speedometer, cruse control, and tranny in latter models mounted in rear-end. not all vehicles, or drivetrain combinations that ford produced went digital at the same time.
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From: Over There
Cause speedo calibration is a math thing I need to point out that these statements don't give enough information. Speedo correction is a matter of percentages or ratios, so "5 mph fast" or "2.5 mph change" also need to know at what speed so a percentage or ratio can be found. For example if it's reading 5 mph fast when you're going 50, then it's 5/50 or 10% off, but if it's reading 5 mph fast when you're going 25 then it's 5/25 or 20% off.
i ain't rite
Joined: Mar 2005
Posts: 65,429
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From: Marlboro Mental Hospital.
the cable and gear are for the speedometer and odometer, the vss converts information to electrical signals for the E4OD PCM, ALL VEHICALS with E4OD have a vss on tranny or when they went digital used the same sensor for anti lock, speedometer, cruse control, and tranny in latter models mounted in rear-end. not all vehicles, or drivetrain combinations that ford produced went digital at the same time.
once again.
SPEEDOMETER on vehicles 91 and older is gear driven.
SPEEDOMETER on vehicles 92 and newer is electronic and driven off the VSS is the rear differential.
we are not talking about ABS, trans signal, or cruise control signal.
if you disconnect the electrical sensor on a pre 91 vehicle with E4OD trans, the speedometer will still work, but the trans will go into limp home mode.
i ain't rite
Joined: Mar 2005
Posts: 65,429
Likes: 5,509
From: Marlboro Mental Hospital.
if you are off around 5 mph low at 55-60, i would drop 2 teeth size on the speedometer gear. this should get you in the ballpark.
this is what i had to do to get mine close.
this is what i had to do to get mine close.
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