Speedo gear question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69GWC · 07-17-2012, 05:31 PM

I do not have a speedo on my truck it seems the gear in the TC (221) just free spins rather then turning the cable (cable is fine and will spin the speedo with a drill on it), well i took the output cover off and the gear just sets on the shaft with no type of "key" way or anything to keep it in place.
My question is this, is this a compression fit and will taking out a shim hold it in place or am i just going to increase bearing preload.

hope that makes since as there has to be something that holds this gear in place.

thanks for any help

69GWC · 07-18-2012, 06:34 PM

Iam going to guess that the nut that holds the yoke in place was not tight enough and that the speedo gear gets squeezed inbetween the two.?
I do not see any other way to hold that gear in place as it has no type of keyway on it.

On a happy note I did fix my TC so now I have 4wd back and going..

msgross · 07-21-2012, 08:59 AM

bump to the top...

not a lot of guys have a working background of the 221 since it was only used for a few years.

69GWC · 07-21-2012, 05:07 PM

Thanks, I did get it fixed yesterday.
I put all new seals in and sealed up everything else and its nice and dry under the truck now.
The speedo gear was loose and not spinning because the nut that holds the rear drive shaft yoke in place was not tight enough when I put it back together I tighten it down and the speedo now works like a champ, I guess whoever was in there last did not install it tight so they could line up the cotter pin holes and did not realize it had another one they could have used if they had got the nut tight.

07-17-2012, 05:31 PM	#1
69GWC Registered User Join Date: Jun 2012 Posts: 1,089	Speedo gear question I do not have a speedo on my truck it seems the gear in the TC (221) just free spins rather then turning the cable (cable is fine and will spin the speedo with a drill on it), well i took the output cover off and the gear just sets on the shaft with no type of "key" way or anything to keep it in place. My question is this, is this a compression fit and will taking out a shim hold it in place or am i just going to increase bearing preload. hope that makes since as there has to be something that holds this gear in place. thanks for any help

07-18-2012, 06:34 PM	#2
69GWC Registered User Join Date: Jun 2012 Posts: 1,089	Re: Speedo gear question Iam going to guess that the nut that holds the yoke in place was not tight enough and that the speedo gear gets squeezed inbetween the two.? I do not see any other way to hold that gear in place as it has no type of keyway on it. On a happy note I did fix my TC so now I have 4wd back and going..

07-21-2012, 08:59 AM	#3
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: Speedo gear question bump to the top... not a lot of guys have a working background of the 221 since it was only used for a few years. __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

07-21-2012, 05:07 PM	#4
69GWC Registered User Join Date: Jun 2012 Posts: 1,089	Re: Speedo gear question Thanks, I did get it fixed yesterday. I put all new seals in and sealed up everything else and its nice and dry under the truck now. The speedo gear was loose and not spinning because the nut that holds the rear drive shaft yoke in place was not tight enough when I put it back together I tighten it down and the speedo now works like a champ, I guess whoever was in there last did not install it tight so they could line up the cotter pin holes and did not realize it had another one they could have used if they had got the nut tight.



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