speedometer to transmission - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71 3/4 ton · 10-23-2007, 12:33 AM

is there a seal on the speedometer cable where it connects to the transmission
i believe there is a leak coming from there

dave2953 · 10-25-2007, 12:13 AM

I know my PG has has an o-ring inside the end that threads on to the transmission. Not sure if that's standard for all trannies, but I'd start by checking there first.

72BLUZ · 10-25-2007, 12:51 AM

there is seal, which looks like a smaller version of the rear seal. you have to drill it out. and then tap a new one in place. the cable to could need replaced. i am experiencing the same problem. i have already changed the seal. but now i need to order a new cable

68gmsee · 10-25-2007, 10:03 AM

This is what mine looks like. There is an o-ring seal on it. Also, the nylon driven gear could be worn enough to allow fluid to leak through it. They are color coded and the dealers carry them.

Mine was leaking and I found out my cable was loose. I gave it a little tightening with a pair of pliars and stopped the leak.

72BLUZ · 10-25-2007, 09:38 PM

where the threaded end is there is a seal inside that part of the housing

derrickc · 10-25-2007, 09:42 PM

on mine it looks like a cap with no top to it, mines a 400, ill post a pic tommorow

Texasdeere · 10-25-2007, 10:03 PM

Mine TH400 is leaking at that same place.

Any idea on who would have that inner seal?

I had enough trouble trying to explain to the parts guy what a selector shaft seal was!

derrickc · 10-25-2007, 10:05 PM

not sure, I would say the dealer if any, ill post a pic tommorow and then you have one

1969k10stepside · 10-25-2007, 10:32 PM

Don't you have a 4wd? On a 4wd the speedometer cable goes in the transmission.

72BLUZ · 10-26-2007, 11:10 PM

I Bought Mine From A Trans Supply Shop In Chattanooga, Tn. Im Sure The Could Ship It To You. I Could Furnish You A Number If You Would Like

10-23-2007, 12:33 AM	#1
71 3/4 ton Registered User Join Date: Oct 2006 Location: spokane Posts: 51	speedometer to transmission is there a seal on the speedometer cable where it connects to the transmission i believe there is a leak coming from there

10-25-2007, 12:13 AM	#2
dave2953 Dave's not here, man Join Date: Jun 2004 Location: Winder, Georgia Posts: 2,000	Re: speedometer to transmission I know my PG has has an o-ring inside the end that threads on to the transmission. Not sure if that's standard for all trannies, but I'd start by checking there first. __________________ - 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250

10-25-2007, 12:51 AM	#3
72BLUZ Registered User Join Date: Nov 2006 Location: lafayette, ga. Posts: 832	Re: speedometer to transmission there is seal, which looks like a smaller version of the rear seal. you have to drill it out. and then tap a new one in place. the cable to could need replaced. i am experiencing the same problem. i have already changed the seal. but now i need to order a new cable __________________ Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same.... Ronald Reagan Last edited by 72BLUZ; 10-25-2007 at 12:52 AM. Reason: spelling

10-25-2007, 10:03 AM	#4
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: speedometer to transmission This is what mine looks like. There is an o-ring seal on it. Also, the nylon driven gear could be worn enough to allow fluid to leak through it. They are color coded and the dealers carry them. Mine was leaking and I found out my cable was loose. I gave it a little tightening with a pair of pliars and stopped the leak. Attached Images

10-25-2007, 09:38 PM	#5
72BLUZ Registered User Join Date: Nov 2006 Location: lafayette, ga. Posts: 832	Re: speedometer to transmission where the threaded end is there is a seal inside that part of the housing __________________ Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same.... Ronald Reagan

10-25-2007, 09:42 PM	#6
derrickc Registered User Join Date: Oct 2007 Location: Newfoundland, Canada Posts: 51	Re: speedometer to transmission on mine it looks like a cap with no top to it, mines a 400, ill post a pic tommorow

10-25-2007, 10:03 PM	#7
Texasdeere Registered User Join Date: Sep 2006 Location: League City, Texas Posts: 732	Re: speedometer to transmission Mine TH400 is leaking at that same place. Any idea on who would have that inner seal? I had enough trouble trying to explain to the parts guy what a selector shaft seal was!

10-25-2007, 10:05 PM	#8
derrickc Registered User Join Date: Oct 2007 Location: Newfoundland, Canada Posts: 51	Re: speedometer to transmission not sure, I would say the dealer if any, ill post a pic tommorow and then you have one

10-25-2007, 10:32 PM	#9
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,019	Re: speedometer to transmission Don't you have a 4wd? On a 4wd the speedometer cable goes in the transmission.

10-26-2007, 11:10 PM	#10
72BLUZ Registered User Join Date: Nov 2006 Location: lafayette, ga. Posts: 832	Re: speedometer to transmission I Bought Mine From A Trans Supply Shop In Chattanooga, Tn. Im Sure The Could Ship It To You. I Could Furnish You A Number If You Would Like __________________ Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same.... Ronald Reagan



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