"P'ing" the PSOM - Programming the 92-96 F-Series and Bronco PSOM 

Replaced the PSOM in both of my OBS trucks since I've owned them. When it went bad in my 95 F150, my truck would not shift out of first gear and displayed no other symptoms other than a slight bobbling of the speedo needle at highway speeds. When it went bad in my 94 F250, the odometer was missing numbers from the mileage total, the speedometer went totally dead, and the truck would not shift properly whatsoever. Replaced and all was well again. When an issue comes up with the speedo or odo, and it is accompanied by strange transmission shifting, the PSOM is definitely a good thing to check/try before anything else. Cool video.. will help lots of people.

Man..... i just calibrated the PSOM to my 35x12.50x17 and worked like a charm. Thank you bunches. Made a world of difference on the shifting

Excellent Video, easy to understand and follow. I think It helped me understand the root of the problem I had on my truck. My 1992 F150 I-6 300 4AOD was running rough, late, violent upshifts from 1-2, lagging performance. it had a dead Tachometer, so I pulled the PSOM and repaired a cold solder joint, Truck ran much better after, but still had issues. I replaced oversize tires I bought it with, bought factory size on the door and now the old truck runs and shifts smoothly. I am convinced it was the PSOM Calibration setting.

Just did this reset on my 95 F150 after switching out the cluster due to the odometer and speedo failing. Your directions work A-Okay.

Owned my truck for 15 years and never recalibrated after throwing 31 bfg k/o’s on er... Wish I saw this video back then!! Great info, thanks for the upload!

Thanks for the vid, got mine calibrated down to 864 running BFG A/T 33x12.5 R15 , working better! Everything worked like a champ

A very well done video. Easy to follow instructions. This will help a lot of people out. Thanks

Great video! One thing I figured out while re-calibrating mine was the jumper didn't like the cigarette lighter ground and wouldn't let me toggle through the CAL settings. I moved the alligator clip down to the bolt that holds the seat belt to the floor by the center console and that did the trick. My tires are a little worn so now the speedo is showing high by about 1-2% but it's WAY better than it was before (10+mph low) and now the transmission is shifting much smoother, especially on downshifts coming up to a stop light. Hope this helps someone!

I’m praying this works for my bronco. I put 33s on it and have developed an issue of hard unexpected shifts. This explains everything so well. Can’t wait to test drive.

Great demonstration! You were straight to the point. Now to purchase new tires. Thank you!

Great job! Straight to the point without any fluff filler BS including being man enough to admit a mistake for the greater hood!!

Great video. You actually used my exact tires and size as your example so you did the formula work for me as well. Thanks a ton 96 Bronco I have

I Guess I need to check my 1994 F-150 Lightning it shifting a little weird pull a hill. it pulls a hill and then Jumps into the next lower gear when it shouldn't be doing that at least as soon as it does. Thanks for this info I Appreciate it. 0h yeah THUMB's UP👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻

Thanks for the video. Made the whole process a lot easier.

Why go to the trouble of removing the instrument cluster? You realize there is a single wire connector for the PSOM under the glove box right?!

Wow. I have had my bronco since 2003. Never checked this. I have 35's. I just reprogrammed it yesterday. Holly mother of Joseph, I feel like I have been missing out of a lot of power and great shifting. I wish I would of done this from day one! If you have a lifted F series and have not checked this, do it! Now the cat doesn't make so much stink, it gets and goes like i got a set of headers on it or something! It took me 5 minutes to double check math, and 5 mins to find a jumper, then 2 minutes to change it! I would say this is a MUST if you have an automatic. Also seems like my engine is a little more beastly. Over all it has definitely gotten rid of that DOGGY SLOW feeling from big tires. This is a must for anyone that is looking for more power or get up and go.

Thank you for the in-depth PSOM training on this SPEEDO ADJ adjustments... I am surprised that a math process was involved. vs, getting the formula of read end axel TONE RING nr# -X -REV-MILAGE / by 8K... Were as only thinking to use only the TIRE manufacture REVS PER MILE and use this data and input it in the PSOM.... Thanks for the clarification..!!!

Hi, Hope all is well with everyone. Would a gear change have the same effect as tire size change?

The best formula is 20168/ by tire height divided by.6666 should give you calculation number. I went by new tires and it was correct went reverse with the numbers and came up with the stock tire height for a check. Tried 2 other ways and they where off.

Thanks, you explain it very well

Great video! I’ve been having issues with my trans it seems to happen when the something on the interior side warms up. It will then down shift or sometimes shift really hard into 3rd gear. I’ve also noticed that the cruise control doesn’t work when this starts to act up. I have a 1993 F 250 XLT HD. I was thinking it’s an issue with PSOM but I don’t know how to test. Thanks and keep on making great content!

This was a great video. Super easy to follow for us who are not so mechanically inclined.... I need to replace the PSOM on my 95 f150, I would like to put in one that has a tachometer on it. Would that just be plug and play? Or do I need to do any wiring? Also does the replacement PSOM need to be from another 95? Or will a 93/94 work too?

If your counter reach to "0" calibrations left...I can help with that.

Thanks for this. Was a tiny bit different on my 92 but matched what i read in some forums, it counts forward not backwards and didnt seam to have any limit to how often i could change it, it didnt even have a reset counter, n the psom port wasnt labeled but in the exact spot shown. Just got the tuck with a bad transmission but its been on 38s for 20 years n it was still factory tire size on the psom, this should help as i get ready to swap in a good transmission.

I'm pretty sure the psom in my 94 f150 needs to be replaced. The Speedometer does not work, the od light is flashing and the transmission won't downshift on it's own. Could it be the psom?

Thanks for sharing this, I had no idea you could do this. I'm currently in the process of changing my psom out. Do these hold their last value when being changed out?

Great information. Thank you.

Replaced my cluster 3 times still not workin..no bad fuses ..any help would b great

the tire revs was 640 how come you input 677 on the formula?

Good stuff bro. Thanks for the info!

The program worked, just like in the video. But still didn’t fix my problem. Needle still bouncing and I am not sure the Bronco is shifting into overdrive. Thanks.

Thank you for a easy to understand video

Awesome video, thank you for the info.

Thanks man for the video

Thanks for posting....EXCELLENT

really well done - thanks

Hey I’m having trouble with my bronco not wanting to shifting while I’m drive, it automatically goes to 4th gear. I’ve replaced the solenoid pack plug, the MLPS plug, TPS, VSS, and all fuses. I’m going to be replacing the Speedo as well and the coolant temperature sensor maybe even the PCM to be safe, but if you have any idea or advice where to look please share thanks again for the helpful video

My odometer and speedometer are completely off , flashing overdrive light and rough shift .

My E4OD is shifting erratic. I replaced my tires with a bigger size. Would not changing psom settings make my transmission shift all crazy?

PLEASE HELP I went through this video step by step, however when I hold the RESET button and turn the key to RUN, I get the code “E 03”. When I click RESET again, I get 1000CAL but it won’t let me change the calibration number no matter how many times I click SELECT. I have a wire running from the PSOM terminal to a ground while I’m doing this. Any ideas on how to fix this?

Is it possible to change the psom from E to O? That is the problem I'm having, I believe. My speedo is set to E, but the speedometer is metric and reads too high, while the odometer reads too low, I believe. It's a Canadian truck, and I would think the PSOM should be set to O and not E. I've heard about people who have had this setting change on them....but don't know how to change it back.

Were those bfg all terrains 35's ?

Tengo una van econoline del 1995. El marcador (speedometer) no funciona. Le puse otro y no funcionó. Le compre el speedsensor y no hace nada. Los fusibles is ok. Cual será el problema? Saludos desde Puerto Rico👍

I'm replacing my 97 f 250HD XL guage cluster with an XLT cluster which includes the tachometer, like the one in your video. 2 Questions, is this a plug and play swap as far as the tach goes and what will the odometer read, actual vehicle mileage, or replacement cluster mileage. I guess what I'm asking is where is actual vehicle mileage stored.

Hello I'm doing this calibration of psom what if I'm running front tires different that the rear which one would I enter info on?

My 94 xlt f150 has an rpm gauge. I don't know what trucks they put the ones without in. Maybe the xl

every time i try this, as im pressing the select button to lower the number it switches to trip and miles. i’m at 9.17 and im trying to go down to 8.10. it stops me around 900

What do I need to set mine at? 35x12.50x17 all terrain ko’s. Which is 602 revs per mile. I have 4:88 gears. Truck is a 1995 ford bronco with a 5.0. Thanks

Are all the tone rings the same. 96 150 with 4.9 factory tires. 235/75r15. Thanks

Wow! Thank you for sharing! Cheers! 🍻

Hi My 1995 Ford E-350 the transmission shift early because the speedometer needs calibration the tire size 225/75/16 can anyone help me to get the conversion construction Thank you

What's the 8,000 stand for?

So when I regear will that mess with the PSOM calibration?

I’m dumb how exactly do I get the tone ring teeth? This is my first time doin this so idk wtf I’m doin

My needle will occasionally bounce around as I drive ????

hi i dont have the wire harness u can help me let me know the pin numbers 6 top and 6 bottom for conect negative and positive thanks

did you use your last reset when you checked it if worked at the end?

4:56 How does the speedometer influence a electronic controlled transmission. Im looking at eecIV and eecV pinout and I dont see anything from the speedometer or tach. Im under the impression that the MLPS, OSS and VSS controls when to shift. Please what am i missing?

Does this effectively change the shift points?

Hello my F150 1996 4WD my tire is (( 35x12.5 R20)) how to calibrate my speedometer help pls

If I change diff ratios from 4.10 to 3.55 do I need to reprogram? Ford 10.25 both

what if the thing reads E 03 and thats it

Just curious if an extra step needs to be taken for vehicles that are in KM? As in getting it to revolutions per KM

Will this work for a 1997 f250hd? 7.3 4x4

Ok, can anybody help me out here? - Great video - I have a 97 F250 OBS, how do I disconnect that shift cable, so I can get the cluster out to change a simple bulb??? I feel like I'm getting a lot of resistance from that cable and I'm afraid if I keep pulling on it, I'll break something....Many thanks in advance for some direction!

All the f-150's that i have seen that have never been changed starts out 972! If you do the math on the factory 235/75/15 the number should be 943! I wonder why it is defaulted at 972?

Damn it!

I f…. up my truck as soon as I did that. Now I can’t get my truck to go back to taking off on first gear !!

Why should we care to do this? If you upsize the tire, your odometer will increment more slowly, helping the value of the truck. If you go from 29" to 32" just add 10% to the speedometer reading. While it's cool that it's possible to program it, I see no reason to actually do it