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10-18-2014, 09:12 PM
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#1 |
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Registered User
Join Date: Nov 2013
Location: Kings Mountain, NC
Posts: 30
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TH350 Trans Leak
I know this has been asked before, but I haven't been able to find the thread. My TH350 is leaking around the speedo cable, what can be causing this and what do I need to fix it? Thanks for any help.
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“Somebody has to do something, and it's just incredibly pathetic that it has to be us.” Jerry Garcia |
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10-18-2014, 10:54 PM
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#2 |
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Registered User
Join Date: Jan 2011
Location: Redmond, OR
Posts: 760
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Re: TH350 Trans Leak
Should be an O-ring on the speedo gear portion that goes into the trans.
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68 Chev C20- son has it now 83 K20 - bought from son 70 C20 - in progress |
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10-19-2014, 01:50 AM
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#3 | |
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Registered User
Join Date: Jun 2014
Location: Glendale, Arizna
Posts: 1,642
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Re: TH350 Trans Leak
Quote:
http://www.ebay.com/itm/GM-TH350-Tur...7503bc&vxp=mtr And then if you need a new speedo gear (seal groove worn into the shaft or worn shaft) count the gear teeth and note the color of the gear and get a new gear: scroll down this page a pick out a new one, not used. http://www.ebay.com/sch/i.html?_odkw...r&_sacat=33726 |
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10-19-2014, 10:07 AM
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#4 |
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Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,147
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Re: TH350 Trans Leak
A new bullet will likely solve your problem. Be sure the lip seal is seated. The last few I've gotten the seal was only pressed in a little and it leaked worse than the old. You can get these bullets at your local auto parts house. You can also get the the lip seal and o-ring if you have a local trans parts house and replace them your self. If your speedo if off nows a good time to get the correct speedo drive gear.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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10-19-2014, 08:02 PM
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#5 |
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Registered User
Join Date: Nov 2013
Location: Kings Mountain, NC
Posts: 30
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Re: TH350 Trans Leak
Thanks for the info!
__________________
“Somebody has to do something, and it's just incredibly pathetic that it has to be us.” Jerry Garcia |
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10-19-2014, 08:33 PM
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#6 |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: TH350 Trans Leak
I don't know about the TH350, but some transmissions (like the TKO-600 as an example) have both an inner and outer o-ring and if you forget either, it'll leak.
I'm sure someone will chime in here if, in fact, there are two on an old hydramatic.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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