Removing the speedo gear housing? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

C&C Chevy · 07-06-2009, 10:33 AM

Is it safe to remove the gear housing attached to the tranny without draining it first? I want to check the plastic drive gears to see if they are stripped out. Thanks.

Jonboy · 07-06-2009, 11:12 AM

You will lose some fluid, but it shouldn't be too bad. If you can lift the rear of the truck up, that will help.

C&C Chevy · 07-06-2009, 11:37 AM

So I just remove the retainer and unbolt using the nut in the middle?

C&C Chevy · 07-06-2009, 03:12 PM

OK, i have everything ready to go back in, one question though. How do I make sure I get the driver gear seated correctly onto the drive gear?

Jonboy · 07-06-2009, 03:23 PM

It really can't go anywhere else. You may have to turn the driven gear a little to mesh them. If they are not meshed, the gear housing will not fully seat.

C&C Chevy · 07-06-2009, 03:45 PM

I think I might be missing something. The last pic is the cable end. Its just a square shape, but the housing end has a key shape hole. Am I missing a part??

Jonboy · 07-06-2009, 04:02 PM

The piece that is still in the gear housing goes to that adapter (that makes the 90 degree turn). Should be a key on that pin. If not, pull the pin out, and connect the cable directly to the gear housing. If it works, the key on the pin has sheared, and the 90 degree adapter is your culprit.

C&C Chevy · 07-06-2009, 04:59 PM

ok, now I'm stumped on the 90 degree adapter thing. the adapter works fine if I use a screw driver to turn one side, the other side turns easily. I know the speedo is hooked up good to the gauge, because when I turn it by hand the gauge moves. But when I attached the adapter to the speedo cable and use the key from the drive gear to turn the other side of the adapter, nothing moves on the gauge. So, something is not working in the 90 deg. adapter, and there is no way to take it apart that I can see. A new adapter online is just under $100..

C&C Chevy · 07-06-2009, 08:20 PM

Any ideas? Why would a screwdriver turn the 90 deg. thingy but the speedo cable won't?? Is there a key-shaped adapter for the end of the cable? Never seen one, but who knows?

C&C Chevy · 07-06-2009, 08:26 PM

Any ideas? Why would a screwdriver turn the 90 deg. thingy but the speedo cable won't?? Is there a key-shaped adapter for the end of the cable? Never seen one, but who knows?

Jonboy · 07-06-2009, 08:52 PM

My guess is that something stripped in that adapter. If your cable will not reach, get a longer cable and pitch the adapter. Those aren't all that common.

07-06-2009, 10:33 AM	#1
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Removing the speedo gear housing? Is it safe to remove the gear housing attached to the tranny without draining it first? I want to check the plastic drive gears to see if they are stripped out. Thanks. __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007

07-06-2009, 11:12 AM	#2
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Removing the speedo gear housing? You will lose some fluid, but it shouldn't be too bad. If you can lift the rear of the truck up, that will help.

07-06-2009, 11:37 AM	#3
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Re: Removing the speedo gear housing? So I just remove the retainer and unbolt using the nut in the middle? Attached Images __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007 Last edited by C&C Chevy; 07-06-2009 at 11:39 AM.

07-06-2009, 03:12 PM	#4
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Re: Removing the speedo gear housing? OK, i have everything ready to go back in, one question though. How do I make sure I get the driver gear seated correctly onto the drive gear? __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007

07-06-2009, 03:23 PM	#5
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Removing the speedo gear housing? It really can't go anywhere else. You may have to turn the driven gear a little to mesh them. If they are not meshed, the gear housing will not fully seat.

07-06-2009, 03:45 PM	#6
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Re: Removing the speedo gear housing? I think I might be missing something. The last pic is the cable end. Its just a square shape, but the housing end has a key shape hole. Am I missing a part?? Attached Images __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007

07-06-2009, 04:02 PM	#7
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Removing the speedo gear housing? The piece that is still in the gear housing goes to that adapter (that makes the 90 degree turn). Should be a key on that pin. If not, pull the pin out, and connect the cable directly to the gear housing. If it works, the key on the pin has sheared, and the 90 degree adapter is your culprit.

07-06-2009, 04:59 PM	#8
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Re: Removing the speedo gear housing? ok, now I'm stumped on the 90 degree adapter thing. the adapter works fine if I use a screw driver to turn one side, the other side turns easily. I know the speedo is hooked up good to the gauge, because when I turn it by hand the gauge moves. But when I attached the adapter to the speedo cable and use the key from the drive gear to turn the other side of the adapter, nothing moves on the gauge. So, something is not working in the 90 deg. adapter, and there is no way to take it apart that I can see. A new adapter online is just under $100.. __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007

07-06-2009, 08:20 PM	#9
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Re: Removing the speedo gear housing? Any ideas? Why would a screwdriver turn the 90 deg. thingy but the speedo cable won't?? Is there a key-shaped adapter for the end of the cable? Never seen one, but who knows? __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007

07-06-2009, 08:26 PM	#10
C&C Chevy Registered User Join Date: Feb 2003 Location: Midwest City, OK Posts: 1,001	Re: Removing the speedo gear housing? Any ideas? Why would a screwdriver turn the 90 deg. thingy but the speedo cable won't?? Is there a key-shaped adapter for the end of the cable? Never seen one, but who knows? __________________ Robert Current: 1986 SWB Silverado 4.3 / TH400 Past: 1985 SWB Silverado 305 / TH350 - sold 1995 1987 1/2 ton Silverado - FI 350 / 700R4 sold 2007

07-06-2009, 08:52 PM	#11
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Removing the speedo gear housing? My guess is that something stripped in that adapter. If your cable will not reach, get a longer cable and pitch the adapter. Those aren't all that common.

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