Spedometer Problem

Charging, starting, lighting, gauges, HVAC

Moderators: FORDification, Thunderfoot

Post Reply
User avatar
Jarrad
New Member
New Member
Posts: 45
Joined: Tue Sep 05, 2006 12:07 pm

Spedometer Problem

Post by Jarrad »

The speedometer in my F350 is not working no odometer when I remove cable from tranny and turn gear speedometer works. Gear on cable looks good, when I insert in tranny I cannot turn cable so I assume it is engaging a gear. I removed instrument panel and drove truck with cable installed in tranny and cable does not turn. I bought a new complete cable but gear did not come with it nor did mine fit the new one. I replaced the cable only but same results.

At this stage I do not want to disassemble the tranny. I need to get this safetied. Any Ideas?
User avatar
19674x4
Blue Oval Fanatic
Blue Oval Fanatic
Posts: 903
Joined: Mon Jun 27, 2005 12:31 am
Location: Oakland Oregon/Sheridan Wyoming

re: Spedometer Problem

Post by 19674x4 »

sounds like the gear in the tranny is shot, i would pull it out and check it out. Because if you could spin the cable by hand and the speedo works, then it has to be in the tranny
My Photo Album
2012 Cummins-the luxury Tow Pig
1967 F-250 highboy 352, np435(((((((sold))))))))) My first true love
1968 F100 SWB. 360, np-435, flatbed, currently acting as a hornest nest and bee hive.
1971 F-100 4x4 Step-side. 360, np-435, 70k origional miles- needs allot of love.
User avatar
Jarrad
New Member
New Member
Posts: 45
Joined: Tue Sep 05, 2006 12:07 pm

re: Spedometer Problem

Post by Jarrad »

Would you consider this a big job or is there an easy way to get at that gear?
User avatar
Jarrad
New Member
New Member
Posts: 45
Joined: Tue Sep 05, 2006 12:07 pm

re: Spedometer Problem

Post by Jarrad »

Here's a photo of the rear end of my drive shaft it looks like a problem occurred here or does this look normal ? Could be when this repair was made the speedo gear was compromised ?

Image
fordman
100% FORDified!
100% FORDified!
Posts: 22329
Joined: Sun Aug 28, 2005 8:17 pm
Location: Kansas, Ottawa
Contact:

re: Spedometer Problem

Post by fordman »

to get to the gear i think you have to just take off the tailhousing of the transmission. i haven't messed with that many ford transmissions. and i haven't messed with any others for quite awhile.
User avatar
19674x4
Blue Oval Fanatic
Blue Oval Fanatic
Posts: 903
Joined: Mon Jun 27, 2005 12:31 am
Location: Oakland Oregon/Sheridan Wyoming

Re: re: Spedometer Problem

Post by 19674x4 »

Jarrad wrote:Here's a photo of the rear end of my drive shaft it looks like a problem occurred here or does this look normal ? Could be when this repair was made the speedo gear was compromised ?

Image

I don't see where it comes out of the tranny, could you make the pic bigger. Or have you found where it comes out of the tranny? It looks normal, your u'-joint looks fine. the gear should have a threaded collar on it to attach the cable to. If it's a 4x4 the cable is on the output shaft of the t-case. follow the cable out of the firewall all the way to it's destination.
My Photo Album
2012 Cummins-the luxury Tow Pig
1967 F-250 highboy 352, np435(((((((sold))))))))) My first true love
1968 F100 SWB. 360, np-435, flatbed, currently acting as a hornest nest and bee hive.
1971 F-100 4x4 Step-side. 360, np-435, 70k origional miles- needs allot of love.
User avatar
FORDification
Site & Forum Admin
Site & Forum Admin
Posts: 8049
Joined: Sun Jul 11, 2004 12:52 am
Location: Kansas, Wellsville
Contact:

re: Spedometer Problem

Post by FORDification »

I think he was referring to what appears to be a rewelded driveshaft, probably shortened from a different application. No, I doubt that had anything to do with the speedo problem. Those plastic drive gears just wear out over time, it's not uncommon....especially if the speedo cable wasn't adquately lubed and it siezed up, taking out the plastic drive gear.
____| \__
-O-----O- Keith
'67 F-100 2WD SWB ~ '69 F-100 4WD SWB w/7" chop ~ 1975 F-250 Ranger XLT Supercab Camper Special
ImageImageImage
My '67 restoration video
-> Posting and you! <-a MUST watch for all!!
User avatar
19674x4
Blue Oval Fanatic
Blue Oval Fanatic
Posts: 903
Joined: Mon Jun 27, 2005 12:31 am
Location: Oakland Oregon/Sheridan Wyoming

re: Spedometer Problem

Post by 19674x4 »

wow, i just noticed that shortened driveshaft, good eye keith
My Photo Album
2012 Cummins-the luxury Tow Pig
1967 F-250 highboy 352, np435(((((((sold))))))))) My first true love
1968 F100 SWB. 360, np-435, flatbed, currently acting as a hornest nest and bee hive.
1971 F-100 4x4 Step-side. 360, np-435, 70k origional miles- needs allot of love.
User avatar
Jarrad
New Member
New Member
Posts: 45
Joined: Tue Sep 05, 2006 12:07 pm

re: Spedometer Problem

Post by Jarrad »

Is that spedo gear plastic inside the tranny ? I have had a look at the schematics for the tranny and I am going to have a try at removing the rear housing. Im not shure if I will find a new gear/gaskets but I will check with napa today.
fordman
100% FORDified!
100% FORDified!
Posts: 22329
Joined: Sun Aug 28, 2005 8:17 pm
Location: Kansas, Ottawa
Contact:

re: Spedometer Problem

Post by fordman »

the plastic one comes out with the cable i think. inside the case is a metal one. that runs the plastic one.
User avatar
Jarrad
New Member
New Member
Posts: 45
Joined: Tue Sep 05, 2006 12:07 pm

re: Spedometer Problem

Post by Jarrad »

I replaced the gear in the transmission for $100 after an unsuccessful try at fabricating it on my lathe. Speedometer works now although very jumpy ?
kid

re: Spedometer Problem

Post by kid »

Jumpy? Sticking cable or missing teeth on the plastic gear. Each application gets a different plastic gear on the cable. The tranny gear stays the same across many models.

Plastic gears are also color coded for different gear ratios on the older Fords.
Post Reply