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Old 07-12-2015, 04:05 PM   #1
Racin_jason
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Location: Toronto, Ontario
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transmission quesstion/ Speedometer

I had to replace the speedometer cable on the truck and had begun to pull it out this weekend. When I crawled under the truck to remove the cable from the trans I noticed that it was leaking, what seems to be the sorce of my trans leak from the attachment point that houses the speedo-gear. I was wondering if anyone would know where to look for such a part or what the name of the parts that i'm looking for are called. I'm not planning on doing this until next week or even after cause I did already have a trans-filter replacement to do aswell.

thanks yall
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Old 07-12-2015, 04:26 PM   #2
Titomars
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Re: transmission quesstion/ Speedometer

The speedo Sleeve (what the cable actually screws onto) has 2 seals. One is an o-ring the seals the sleeve to the trans case. the 2nd is a small lip seal the seals the speedo gear to the sleeve. You can see both with the sleeve and gear out. I would assume both are available through Napa or GM.

Taken from the 73 to 78 parts book.
TH400 sleeve to case seal= 6264904
all others except K series, sleeve to case seal= 6264903
speedo gear seal= 3869910
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1977 Chevrolet C/10 Silverado. Step-Side, Factory 454, TH400, 3.73 Posi 12 Bolt.
1975 Chevrolet El Camino. 350, TH400, 3.08 Posi 10 Bolt.
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Old 07-12-2015, 07:38 PM   #3
chrly1492
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Re: transmission quesstion/ Speedometer

went through this on my th350 just this year changing from a cable to electric speedometer. The bullet part is available through summit, or a local parts house. the gear gets a bit harder to find, but you will need to get it out and count the teeth to get the exact replacement. Color will be asked by the vendor, but I found with mine, that the teeth number didn't match the color that it should have been. I got mine through Napa, but it was an order, not in stock. good luck with yours..Mine didn't leak until I touched it.
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Old 07-12-2015, 07:53 PM   #4
Racin_jason
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Quote:
Originally Posted by Titomars View Post
The speedo Sleeve (what the cable actually screws onto) has 2 seals. One is an o-ring the seals the sleeve to the trans case. the 2nd is a small lip seal the seals the speedo gear to the sleeve. You can see both with the sleeve and gear out. I would assume both are available through Napa or GM.

Taken from the 73 to 78 parts book.
TH400 sleeve to case seal= 6264904
all others except K series, sleeve to case seal= 6264903
speedo gear seal= 3869910

Thank you I'll look into this asap
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Old 07-12-2015, 07:54 PM   #5
Racin_jason
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Quote:
Originally Posted by chrly1492 View Post
went through this on my th350 just this year changing from a cable to electric speedometer. The bullet part is available through summit, or a local parts house. the gear gets a bit harder to find, but you will need to get it out and count the teeth to get the exact replacement. Color will be asked by the vendor, but I found with mine, that the teeth number didn't match the color that it should have been. I got mine through Napa, but it was an order, not in stock. good luck with yours..Mine didn't leak until I touched it.
Yea you know I found that same one with summit, looked like my best bet for a full replacement. I was reading something about seating them. Do you know anything about that our are they just fitted in and bolted down?
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Old 07-12-2015, 10:22 PM   #6
chrly1492
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Re: transmission quesstion/ Speedometer

I assume that you're working on a th350... once you have the new parts put together, it all slides into place with a bit of a pop. you can tell when it's in as the bracket lines up with the slot in the bullet before you even tighten the bolt.
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Old 07-12-2015, 10:41 PM   #7
geezer#99
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Re: transmission quesstion/ Speedometer

Here's a source for speedo bullets, seals and gears.
http://www.transmissioncenter.net/sp...n_______va.htm
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