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12-26-2015, 08:06 AM
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#1 |
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Registered User
Join Date: Jan 2009
Location: Perth Australia
Posts: 51
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TH400 Trans Leak at Speedo Housing
Hi all,
I recently changed the speedo housing o ring and driven gear seal to stop a leak. Well it still leaks! After doing some research it looks as though there should have been a small spring clip holding the lip seal in position. However that was missing when I replaced the oring and seal. Would this cause the leak? or perhaps a worn driven gear shaft is the culprit. any ideas appreciated. Last edited by 65 Fastback; 12-26-2015 at 08:19 AM. |
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12-26-2015, 09:42 AM
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#2 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: TH400 Trans Leak at Speedo Housing
I had the same thing on my 700 r4. I ended up having to buy a whole new one. I went to the transmission shop bought a new one. I put a good coat of dow corning 111 all around the o ring and it never leaked again.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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12-26-2015, 10:12 AM
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#3 |
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Registered User
Join Date: Nov 2013
Location: Midland, Texas
Posts: 203
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Re: TH400 Trans Leak at Speedo Housing
A friend of mine owns a transmission shop and he told me he always puts 2 seals in all of them he works on. I have never seen one with a clip in it.
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"In an insane world a sane man must appear insane" ~Spock~ |
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12-26-2015, 10:39 AM
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#4 |
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Chance
 
Join Date: Sep 2001
Location: Belcourt ,ND, USA
Posts: 750
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Re: TH400 Trans Leak at Speedo Housing
Make sure there is not a hole all the way through your speedo gear. I had a slow leak and it turned out it had a hole in it. I took the gear out and air was able to blow all the way through it.
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1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400 |
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12-27-2015, 07:56 PM
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#5 |
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Registered User
Join Date: May 2012
Location: Faith,NC
Posts: 1,626
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Re: TH400 Trans Leak at Speedo Housing
I did the same thing and mine still leaks too. I didn't change the inner o ring though, just the outer one. I don't know about the spring clip, maybe someone who knows will enlighten all of us. Let us know when you get it fixed and how you did it.
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12-27-2015, 09:57 PM
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#6 | |
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Registered User
Join Date: Jan 2009
Location: Perth Australia
Posts: 51
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Re: TH400 Trans Leak at Speedo Housing
Quote:
He did say if your driven gear is old and worn out, fluid could be slipping by on the stem of the driven gear, especially if it has a ring groove where the inner seal rides. I need to remove mine anyway and install one with 2 extra teeth as I changed my rear gears from 308 to 372 and the speedo reads 5/6 mph to fast on the gauge |
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