Can someone tell me the names of these seals? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

406cid70Chevy · 11-13-2003, 08:13 PM

here's the pic. I don't know the names, so it's kinda hard to get new ones. It's a TH400 Tranny. Thanks for any help.

*67Fleetsidedream* · 11-13-2003, 08:32 PM

Here is what I do when I don't know a name to a part. I take the part off the truck and go to the parts store or the Chevy dealerships parts counter. Show them the parts that I need and see if the can provide. Usually they can fix you up.

Hope this helps

Class of 69 · 11-13-2003, 08:38 PM

#1 is an adaptor. You may be able to get a replacement gasket from a speedometer, or transmission shop.
#2 is the speedometer driven gear sleeve. It takes an O ring. Also available at the transmission shop, or a GM dealer.
I suggest replacing the driven gear itself while you have it apart. If you have trans fluid leaking out of the adaptor, it is following the gear shaft thru the sleeve, and should not do that. I suspect the shaft on the driven gear is very worn. They are just plastic, and color coded for replacement.
When replaceing the gasket in the adaptor, it should actually be packed with grease. You may consider just taking the adaptor to a speedometer shop. They can set up a complete replacement unit at a low cost, or clean, inspect, pack, and replace the gasket for you.

406cid70Chevy · 11-13-2003, 11:57 PM

Ok thanks guys, you're a big help.

72superBB · 11-16-2003, 10:53 PM

I just replaced this on my th400. I replaced the #2 part of your picture. It isthe speedometer gear housing. The Gm dealership said to get the o ring inside I hade to buy the whole housing which was around $45. The speedometer gear was replaced as well (this was only$6) because it was worn around where the seal rubbed. I did not replace part #1 because they told me that fluid should never be past part #2. So if you replace the speedometer gear and gear housing(which comes with a new o-ring) then you should be fine with the part #1 you have.

hope this helps.

walker · 11-17-2003, 01:10 AM

The one on the left is Fred, the one on the right is Joe. Hope this helps, at least you can call them by name when you're cursin at 'em for leakin'

jugernot · 11-17-2003, 03:11 AM

Wow, good question. Thats what make this board so great. Sharing the knowledge.

11-13-2003, 08:38 PM	#3
Class of 69 Registered User Join Date: Mar 2003 Location: Stillwater MN Posts: 1,166	#1 is an adaptor. You may be able to get a replacement gasket from a speedometer, or transmission shop. #2 is the speedometer driven gear sleeve. It takes an O ring. Also available at the transmission shop, or a GM dealer. I suggest replacing the driven gear itself while you have it apart. If you have trans fluid leaking out of the adaptor, it is following the gear shaft thru the sleeve, and should not do that. I suspect the shaft on the driven gear is very worn. They are just plastic, and color coded for replacement. When replaceing the gasket in the adaptor, it should actually be packed with grease. You may consider just taking the adaptor to a speedometer shop. They can set up a complete replacement unit at a low cost, or clean, inspect, pack, and replace the gasket for you. __________________ 69 GMC K10 ..some restoration required....still.. Last edited by Class of 69; 11-13-2003 at 08:40 PM.

11-16-2003, 10:53 PM	#5
72superBB Registered User Join Date: Nov 2003 Location: Mandan, ND Posts: 422	I just replaced this on my th400. I replaced the #2 part of your picture. It isthe speedometer gear housing. The Gm dealership said to get the o ring inside I hade to buy the whole housing which was around $45. The speedometer gear was replaced as well (this was only$6) because it was worn around where the seal rubbed. I did not replace part #1 because they told me that fluid should never be past part #2. So if you replace the speedometer gear and gear housing(which comes with a new o-ring) then you should be fine with the part #1 you have. hope this helps. __________________ Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB

11-17-2003, 01:10 AM	#6
walker Registered User Join Date: Jul 2003 Location: north of Phx AZ about 30 miles Posts: 698	The one on the left is Fred, the one on the right is Joe. Hope this helps, at least you can call them by name when you're cursin at 'em for leakin' __________________ Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold

11-13-2003, 08:13 PM	#1
406cid70Chevy Registered User Join Date: Nov 2002 Posts: 43	Can someone tell me the names of these seals? here's the pic. I don't know the names, so it's kinda hard to get new ones. It's a TH400 Tranny. Thanks for any help.

11-13-2003, 08:32 PM	#2
67Fleetsidedream Wiseass secured himself a BAN Join Date: Nov 2000 Location: MOON!!! Posts: 2,282	Here is what I do when I don't know a name to a part. I take the part off the truck and go to the parts store or the Chevy dealerships parts counter. Show them the parts that I need and see if the can provide. Usually they can fix you up. Hope this helps

11-13-2003, 11:57 PM	#4
406cid70Chevy Registered User Join Date: Nov 2002 Posts: 43	Ok thanks guys, you're a big help.

11-17-2003, 03:11 AM	#7
jugernot Life, Be In It..... Join Date: Oct 2003 Location: Novato, California Posts: 1,498	Wow, good question. Thats what make this board so great. Sharing the knowledge.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.