Speedometer question

[hug_army]

I got a speedo question. I have a '96 XLT w/ 31's and my speedo is off 5mph, @ 65mph I'm doing 70mph. I went to the Ford parts counter to get the pink 19 teeth speedo gear for the transmission and the guy said the 96 XLT 4wd do not have the gear in the transmission :frustrate , it is controlled magnetically on the rear axle. He also said that there is a way to change the speedo electronically, but you can only did 5 times and also he said that he did not know how to do it though.

Thank you for your help.

 

[section525]

He's wrong. It's a gear in the tcase. They didn't switch to the rear axle until 1998.

 

[hug_army]

So there is a gear on top of the transmission for the speedo.

 

[section525]

On your transfer case, but yeah. There's one bolt holding the mechanism in. Remove it, pull the sensor out. The gear is just held on with a clip. Remove it, put the new gear on. Reinsert. Bam. Done.

 

[RammaR]

I did the same thing on my '96 XLT. The only problem I had was the first time I tried to get the correct speedo gear from Ford the gave me the one for the automatic transmission - which I have - however it didn't fit. For some reason, maybe because it goes in the transfer case, you'll need the manual tranny version of the speedo gear. Its really a simple swap out once you have the right part - good luck.

 

[TheFox88]

So, if you go from the stock 235 tires to 31" you need the 19 tooth speedo gear?

 

[hug_army]

The part number I needed for my '97 5-speed auto that originally came with 4.10 axle and 255 70R16 tires was C0DZ-B. It is the 19 tooth pink one. My original gear was the 20 tooth black one. One less tooth was all I needed. I used this formula: New Teeth = (Current Teeth x Speedo Reading)/Actual Speed. Be aware though that the table came from a Ford Ranger site. Unfortunately I don't have the link anymore so I don't know whom to give credit. The gear I used says that it goes on a manual transmission. When the parts lady first brought out the 19 tooth gear for the automatic, it was too big. Fortunately I took the gear out and brought it with me to compare (boy did it shift funny without the gear!). Here is the table that I used:

Manual Transmissions and all 4x4s:

16 tooth wine(C0DZ-A)
17 tooth white(C3DZ-C)
18 tooth yellow(C0DD-B)
19 tooth pink(C0DZ-B)
20 tooth black(C1DZ-A)
21 tooth red(C4OZ-A)

2WD Automatic Transmissions:

16 tooth blue(D0AZ-A)
17 tooth green(C7SZ-A)
18 tooth gray(C7SZ-B)
19 tooth tan(C7VY-A)
20 tooth orange(C8SZ-B)
21 tooth purple(D0OZ-B)

Quoted from the useful threads last page:
Ford Explorer Ranger Owners Serious Explorations >
__Explorer Repair Tech Modifications >
____List of Useful Threads >
______Largest Tire for 95+ Explorers & Speedo Gear

 

[Bronco638]

Here's the link to the info on The Ranger Station:Speedo Gear data

I just swapped in 4.10 axles with 32" BFGs. I used the Ford Motorsport formula:
Driven Gear Teeth = (Drive Gear Teeth x Axle Ratio x Tire Rev. Per Mile) / 1000

There are 7 teeth on the gear in my BW1354 (and since the speedo worked fine with my 4405, I'll assume there's 7 teeth on that gear too). You can find the tire's revolutions per mile under the "Specs" link on TireRack.com. From there it's simple math:
~19 = ( 7 * 4.10 * 655 ) / 1000

Hope this helps - Dave.

 

[RammaR]

Not to hijack the thread, but how hard was it to swap out to the 4.10 gears? I've got 31's with 3.55 gears and am thinking of jumping to 4.10's in the next couple of months. Thanks.

 

[Bronco638]

I didn't swap R&Ps, I swapped axles. That way I didn't have to deal with backlash settings, pinion preload, etc. If you're mechanically inclined, it's not too hard but it would be nice if you had another set of hands. I did everything solo. I had 3.55s and you could get away with driving on 31s but it'd be better if you had 3.73s (for gas mileage). 4.10s & 31s would be great off-road.

If you're gonna swap R&Ps, I suggest having someone who knows what they're doing do the work, you need a lot of special tools/knowledge. I found it to be cost effective to simply swap axles because because swapping R&Ps gets expensive.