- Joined
- March 4, 2007
- Messages
- 26,320
- Reaction score
- 126
- City, State
- anaheim hills,california
- Year, Model & Trim Level
- 95 ranger 4x4/ 91 X 4x4
...Before I did my gear change on my 95 Ranger, I had kept reading for the 95 and newer Rangers how you needed an electronic device to dial in your speedometer or where you had to take your vehicle into a shop and have them plug into your computer to change the values for the speedometer calibration to work..
..I am happy to say that this is not the case...:biggthump
..The Story
..When I first got my truck it had 30" or 31" tires on it with stock 4.10 gears and I quickly moved up to 32" tires while working on horsepower upgrades to push the bigger tires over the past number of years..
..In the meantime I started doing speed control with my on board GPS and found it very accurate for what I needed and I learned my speedo was off (reading slower than actual speed) about 5-7 mph progressively between 50 and 70 mph..(actual 55-77 mph)
..The need for more power recently lead me to 4:88 gears as an upgrade for the 32" tires..I thought before the gear change and quickly confirmed afterward that the RPM's would be running a tad bit high in all gear ranges..With this set-up my speedo was reading 5-7 mph faster than I was actually going in all gears over 20 mph according to many miles watching the GPS..
..Along come the 33" tires to settle the 4.88's new high RPM's down a little bit and to see what a difference this would make on the speedometer reading.. I got the speedometer down a little bit to about 4-6 mph progressively in all gears over about 30mph..
...Needless to say this became a little confusing trying to keep up with my current math equations while out of town and coming up on a known speed trap....
________________________________________________________
..It was time to calibrate my Speedo..
..I knew that the older vehicles had a gear at the end of the speedometer cable plugged into the trans (auto/manual trans) or transfer case (4x4) while the 95 and newer Rangers were to use an electronic speed sensor on top of the rear axle to get the speed readings from..
..Now that I got the tire and gear ratio I wanted I decided to crawl under the truck and do some investigating...Just my luck, an electrical connector..
..So I decided to unplug it and pull it out..(7/16 socket or metric equivalent.. )
..When I pulled it out I was surprised and excited to find it had a plastic gear on the end and I remember reading up about them in this thread..
http://www.explorer4x4.com/speedo.html
..After going back and re-reading that thread now that I know I have a plastic gear I can swap out, I took special note of this information..
..With all the "Simple Gear Calculators" out there, this info helped me the best..
..Now I'm excited..
..I probably have a 19 tooth gear and all I have to do is count the teeth and verify the color of the plastic gear...I quickly ran over to read this thread before I started counting teeth on my gear.
..The Speedometer gears and color code chart..
http://www.explorerforum.com/forums/showthread.php?t=158739&highlight=gear
..Piece of cake..16-21 tooth gears and all I need to do is add 1 more tooth to my plastic gear and I'm set...(List price $18) Let's give this a count...
..Wait a minute...My plastic gear is RED and I confirmed the tooth count as being 21....There's got to be one with 22 teeth...
There is not a 22 tooth gear for this..:thumbdwn:..In fact, Ford makes up to 26 tooth gears for other vehicles but for this gear configuration they stopped using the 22 tooth gear back in the early 60's due to failures since the teeth were so thin..
..But what am I gonna do?
..So I started calling Speedo shops and Pro Street shops and after several failed attempts of finding either a 22 or 23 tooth gear at these places, I was on my own to search the net..
..I kept coming up with the same thing and every 23 tooth gear I read about was a GM product of a different configuration until...
..Until I stumbled upon and read this info on a Full Size Bronco..:biggthump
http://bronco.zenseeker.net/Speedo.htm
...He had all the gears and the numbers of the 16-21 tooth gears also but wait, what was this?..It's a 23 tooth gear that looks just like ours...But could it be?..Would it work?
..It's a Jeep part..P/N J3167393 =$10
..And it is a white gear not to be confused with the Ford white gears and their tooth counts...
..The Outcome
..While I thought the 22 tooth was the fix this is as close to probably what the stock speedometer reading was...
..My speedometer now reads about 2 to 2-1/2mph over my actual speed thru all of the gears and dead on 90% the rest of the time..(with the 23 tooth gear, 4:88 gears, and 33' BFG tires)
..Meaning that it's pretty dead on for a manual trans and if it's off it's in my favor..
________________________________________________________
Added Bonus - Parts and Part numbers
..All of the items (separate) that comprise this sensor set up..
..Installed together..
..Some info
..I wanted a new "O" ring for my sensor as mine had shrunk a little and was getting hard..Ford does not sell the "O" ring by itself and it only comes from them attached to the sensor...
..The sensor P/N from Ford is E9LZ-9E731-A while it's Alternate number (while still a Motorcraft number) used by Ford and many aftermarket suppliers is DY-588 -List Price = $39.80
This part can be found on over 1000 different models of Ford/Lincoln/Mercury and from what I could find from years 1984-2004..
..If you do buy a 16-21 tooth gear from Ford it does not come with the "C" clip..This is sold separate..P/N C1DZ-17292-A = List -$1.78
..I hope this will help you out on your next project..
..I am happy to say that this is not the case...:biggthump
..The Story
..When I first got my truck it had 30" or 31" tires on it with stock 4.10 gears and I quickly moved up to 32" tires while working on horsepower upgrades to push the bigger tires over the past number of years..
..In the meantime I started doing speed control with my on board GPS and found it very accurate for what I needed and I learned my speedo was off (reading slower than actual speed) about 5-7 mph progressively between 50 and 70 mph..(actual 55-77 mph)
..The need for more power recently lead me to 4:88 gears as an upgrade for the 32" tires..I thought before the gear change and quickly confirmed afterward that the RPM's would be running a tad bit high in all gear ranges..With this set-up my speedo was reading 5-7 mph faster than I was actually going in all gears over 20 mph according to many miles watching the GPS..
..Along come the 33" tires to settle the 4.88's new high RPM's down a little bit and to see what a difference this would make on the speedometer reading.. I got the speedometer down a little bit to about 4-6 mph progressively in all gears over about 30mph..
...Needless to say this became a little confusing trying to keep up with my current math equations while out of town and coming up on a known speed trap....
________________________________________________________
..It was time to calibrate my Speedo..
..I knew that the older vehicles had a gear at the end of the speedometer cable plugged into the trans (auto/manual trans) or transfer case (4x4) while the 95 and newer Rangers were to use an electronic speed sensor on top of the rear axle to get the speed readings from..
..Now that I got the tire and gear ratio I wanted I decided to crawl under the truck and do some investigating...Just my luck, an electrical connector..
..So I decided to unplug it and pull it out..(7/16 socket or metric equivalent.. )
..When I pulled it out I was surprised and excited to find it had a plastic gear on the end and I remember reading up about them in this thread..
http://www.explorer4x4.com/speedo.html
..After going back and re-reading that thread now that I know I have a plastic gear I can swap out, I took special note of this information..
..With all the "Simple Gear Calculators" out there, this info helped me the best..
I told Gene that I had a 19-tooth speedo gear. He didn’t ask what vehicle or gear ratio or even tire size that I had. I then told Gene that when my speedometer was reading 70 MPH I was actually going 65 MPH.
This one was very easy for Gene. He said that to slow down the speedometer 5 MPH we wanted to add one tooth to the gear. Very simple.
..Now I'm excited..
..I probably have a 19 tooth gear and all I have to do is count the teeth and verify the color of the plastic gear...I quickly ran over to read this thread before I started counting teeth on my gear.
..The Speedometer gears and color code chart..
http://www.explorerforum.com/forums/showthread.php?t=158739&highlight=gear
..Piece of cake..16-21 tooth gears and all I need to do is add 1 more tooth to my plastic gear and I'm set...(List price $18) Let's give this a count...
..Wait a minute...My plastic gear is RED and I confirmed the tooth count as being 21....There's got to be one with 22 teeth...
There is not a 22 tooth gear for this..:thumbdwn:..In fact, Ford makes up to 26 tooth gears for other vehicles but for this gear configuration they stopped using the 22 tooth gear back in the early 60's due to failures since the teeth were so thin..
..But what am I gonna do?
..So I started calling Speedo shops and Pro Street shops and after several failed attempts of finding either a 22 or 23 tooth gear at these places, I was on my own to search the net..
..I kept coming up with the same thing and every 23 tooth gear I read about was a GM product of a different configuration until...
..Until I stumbled upon and read this info on a Full Size Bronco..:biggthump
http://bronco.zenseeker.net/Speedo.htm
...He had all the gears and the numbers of the 16-21 tooth gears also but wait, what was this?..It's a 23 tooth gear that looks just like ours...But could it be?..Would it work?
..It's a Jeep part..P/N J3167393 =$10
..And it is a white gear not to be confused with the Ford white gears and their tooth counts...
..The Outcome
..While I thought the 22 tooth was the fix this is as close to probably what the stock speedometer reading was...
..My speedometer now reads about 2 to 2-1/2mph over my actual speed thru all of the gears and dead on 90% the rest of the time..(with the 23 tooth gear, 4:88 gears, and 33' BFG tires)
..Meaning that it's pretty dead on for a manual trans and if it's off it's in my favor..
________________________________________________________
Added Bonus - Parts and Part numbers
..All of the items (separate) that comprise this sensor set up..
..Installed together..
..Some info
..I wanted a new "O" ring for my sensor as mine had shrunk a little and was getting hard..Ford does not sell the "O" ring by itself and it only comes from them attached to the sensor...
..The sensor P/N from Ford is E9LZ-9E731-A while it's Alternate number (while still a Motorcraft number) used by Ford and many aftermarket suppliers is DY-588 -List Price = $39.80
This part can be found on over 1000 different models of Ford/Lincoln/Mercury and from what I could find from years 1984-2004..
..If you do buy a 16-21 tooth gear from Ford it does not come with the "C" clip..This is sold separate..P/N C1DZ-17292-A = List -$1.78
..I hope this will help you out on your next project..