Transmission fluid leak - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tomatocity · 07-09-2005, 01:52 AM

Transmission fluid is leaking from the speedometer gear. I don't have the manuals to look it up so does the speedo gear have a O-ring or gasket that could be leaking? Thanks in advance.

Ps-Iwill be getting a Service Manual soon.

woodridge · 07-09-2005, 07:33 AM

There is an o-ring around the "bullet" that the gear goes in and a metal clad or rubber seal, depending on the type of bullet, inside.

**pjmoreland** · 07-09-2005, 08:30 PM

The speedometer gear can also get a groove worn in it from rubbing on the internal seal, so just replacing the seal may not fix the leak.

Fred T · 07-09-2005, 10:56 PM

If there is fluid in the speedo cable, it's the inner seal. If the cable is dry, it's the outer o-ring. To remove the bullet, jack the rear of the truck up so the fluid flows to the front, and less comes out when you remove the bullet.

tomatocity · 07-10-2005, 02:18 AM

Quote:

Originally Posted by Fred T

If there is fluid in the speedo cable, it's the inner seal. If the cable is dry, it's the outer o-ring. To remove the bullet, jack the rear of the truck up so the fluid flows to the front, and less comes out when you remove the bullet.

Thanks Fred. I will check it tomorrow.

Oh yes there is, my truck is ugly but it only has one way to go.

07-09-2005, 01:52 AM	#1
tomatocity Registered User Join Date: Jun 2005 Location: Sacramento CA Posts: 1,255	Transmission fluid leak Transmission fluid is leaking from the speedometer gear. I don't have the manuals to look it up so does the speedo gear have a O-ring or gasket that could be leaking? Thanks in advance. Ps-Iwill be getting a Service Manual soon. __________________ Got bored, sold everthing. Got bored, looking for a 1960-66 C-10. Want to build my last truck.

07-09-2005, 07:33 AM	#2
woodridge Senior Member Join Date: Feb 2005 Location: Maynardville, Tn Posts: 3,030	There is an o-ring around the "bullet" that the gear goes in and a metal clad or rubber seal, depending on the type of bullet, inside. __________________ SEMA Network- Protect our Hobby! 71 C30 in pieces, starting to come together. Click here for A Place For Tennessee Truck Enthusiest To Meet

07-09-2005, 10:56 PM	#4
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	If there is fluid in the speedo cable, it's the inner seal. If the cable is dry, it's the outer o-ring. To remove the bullet, jack the rear of the truck up so the fluid flows to the front, and less comes out when you remove the bullet. __________________ Fred There is no such thing as too much cam...just not enough engine.

07-09-2005, 08:30 PM	#3
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,406	The speedometer gear can also get a groove worn in it from rubbing on the internal seal, so just replacing the seal may not fix the leak.



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