I have an 84' F250 that has what looks like factory-installed cruise control as well as a Stewart-Warner ratio adapter. There are a total of three cables from dash to transmission. The Instrument cluster to speed control sensor D4AF-9E731 (near the booster) is ~15", from the sensor to the ratio adapter is ~33", and a third ~15" cable from the adapter into the C6 auto trans.

The ratio adapter started to seize up and broke the portion of the cable coming from the transmission going to the ratio adapter, and the cable under the truck has simply started to fall apart. Problem I'm seeing though is that none of the parts catalogs appear to show the short cable going into the transmission (C6) or the 33" cable that comes up to the speed sensor adapter. ATP and Pioneer show multiple length cables and reference the ratio adapter and speed control sensor and one that's about the right length, but none of the photos of the cables seem to have the right ends on them.

Has anyone seen a setup like this before, and if so where do I find these odd-length cables or do I have to make my own? RockAuto and LMC Truck don't have them, not sure where else to look. I took apart the ratio adapter and have cleaned and re-greased it so would rather not leave it out unless I have to.

 

My guess the ratio adapter was used because of a gear change and no need to check the gear on the speedo cable or the transmission or both.
I had to run one on a K5 Blazer when I checked to 4.10 gears but it went on the transmission and the factory cable then screwed into it.
I have not see one in the middle of a cable?

I dont think I would trust pictures 100% as they can use any old picture and you start thinking like you they will not work.
Any way to call who list the cables and maybe get pictures of them or send a picture of the ends on your cable.
Other than that I got nothing sorry
Dave ----

ps was there a name on the adapter who made it and if so look to see if they have any information.

 

Here the standard length cables. Looks like the shortest with cruise is 35". Why don't you take the ratio adapter out and buy the longer 35 inch cable? Do you have a overdrive unit and need it?

https://www.rockauto.com/en/catalog/...ter+cable,1440

 

Dave if you read my post I had one when I swapped in 4.10 gears so I would not need to figure out what gears was needed to change in the trans / transfer case to get the speedo to read right.
In my case you undid the cable at the trans / transfer case, install the adapter and screw the cable into the adapter and done.
So there was no need for a short cable like he has.
Dave ----

 

Hold on to your original stuff don't make the mistake of discarding. I once had a 1964 Ford 4-wheel drive separate transfer case I don't remember how to Speedo was hooked up but I know it was one long length I took it out and down in the valley there was a truck parts Outlet and they made up the inside cable itself and you used your same jacket if it was good because a lot of the classic trucks still had cable Speedo drives . eBay motors seems to have stuff that's hard to find you can search there if you haven't already.

 

No overdrive unit. The truck has a Dana 4.10 rear and a C6 trans. I have a full set of Factory manuals and this setup looks 100% stock though the ratio adapter doesn't appear in any photos, there is one vague reference to the "corrector" in the troubleshooting section.


I'm going to assume the instrument clusters were probably all calibrated the same to save money and easy of manufacturing (1:1 final drive, maybe 3.73 rear and stock tire size). Going to 4.1 would shift the speedo high by about 9% by my calculations assuming all else is equal. The ratio adapter is hand scribed with a 1.088 on the side, which makes sense if the adapter ratio is 1.088 IN and 1 OUT as the engine is turning more RPM's for the same road speed with the 4.10 rear...or do I have that backwards?

Either way, the 35" cable is the one from the back of the cluster (with plastic clip) to the speed sensor, which because I had a brain fart last night when I measured the cables I was totally wrong. That upper cable IS about 35" long. However, there is no corresponding ~33" from the cruise module under the cab to the ratio adapter or a ~15" cable from the ratio adapter to the transmission. There is suspiciously a 60" cable for trucks "with cruise" that goes from the cruise module into the transmission. I may ditch the ratio adapter and use this cable and see how far it's off with GPS and go from there. I don't care about the speed too much but I do want it to have a relatively accurate but at least functional odometer. Makes me wonder if someone didn't install it to get out of a speeding ticket by getting their speedometer recalibrated and the ticket reduced to improper equipment or something.....

EDITED: I did fine a pretty useful link: https://www.garysgaragemahal.com/spe...--sensors.html which when I dug in actually does not show an application P/N for a 84 F250 with factory cruise AND a ratio adapter. So something about this may not be stock after all.....as least I feel vindicated that I found something not really covered in the shop manuals...

 

All mechanical speedometers in all older cars are calibrated to 1000 revolutions per mile. Any corrections needed during the design are done on the vehicle, usually the speedo gears in the tailshaft, and the speedometer is left alone having that same calibration.