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08-21-2017, 02:33 PM
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#1 |
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Registered User
Join Date: Oct 2015
Location: Lincolnshire, IL / Burlington, WI
Posts: 209
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TH400 leak question
I am getting a slight fluid leak that builds up around the speedometer cable where it enters the tranny housing. What's interesting is that there are no drips where the cable actually attaches to the tranny but the red fluid accumulates on the larger round band which is about an inch away from the housing. This round band can be finger turned to a point and then I used a pliers and tried to tighten a little but it doesn't seem to lock down. Since I'm looking at this area from my garage floor while using a floor jack, I can't get a real good look at how the speedo cable secures into the tranny housing. It almost looks like there is a small screw in the metal where speedo goes into tranny housing.
Can anyone tell me how the speedo cable is attached to the tranny housing? Also, any thoughts why the fluid would accumulate by the band and not where it enters the tranny housing?
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1970 C-10 CST, LWB, 402/400, A/C |
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08-21-2017, 03:05 PM
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#2 |
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Registered User
 
Join Date: May 2013
Location: WEST PALM FLORIDA
Posts: 1,174
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Re: TH400 leak question
most trany guys call it a bullet , has an inner and outer o ring , sounds like the inner o ring is shot , they are cheep , just get a bullets
just the seals http://www.ebay.com/itm/Speedo-LEAK-...-/310409441700
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68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive Last edited by 67 chevelle; 08-21-2017 at 03:10 PM. |
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08-21-2017, 03:08 PM
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#3 |
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Registered User
Join Date: Mar 2015
Location: st cloud mn
Posts: 163
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Re: TH400 leak question
The speedo cable has a nut that threads onto the housing at the tranny. The housing is round, and holds the speedo drive gear in place. The speedo drive gears are replaceable, and different tooth counts depending on rear axle ratio and tire diameter. There should be a rubber o - ring that seals the housing to the tranny.
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08-21-2017, 04:25 PM
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#4 |
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Senior Member
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,414
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Re: TH400 leak question
There is also a lip type seal that goes into the cable adapter and seals against the speedo driven gear. It is held in by a wire clip. You can buy a seal kit that comes with the o-ring for the adapter as well, I paid $8 on eBay.
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70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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08-21-2017, 06:40 PM
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#5 |
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Registered User
Join Date: Oct 2015
Location: Lincolnshire, IL / Burlington, WI
Posts: 209
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Re: TH400 leak question
Thanks to all. Ordered the o rings from eBay and will tackle the job this weekend!
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1970 C-10 CST, LWB, 402/400, A/C |
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08-21-2017, 06:54 PM
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#6 |
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Registered User
Join Date: Dec 2013
Location: Omaha NE
Posts: 620
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Re: TH400 leak question
Keep us posted on how it turns out! Thanks
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1972 C10 Custom Deluxe LWB, 402/400, PS, PB, A/C, Highlander, Hugger / White 1971 C10 Cheyenne LWB (SWB), 350/350, PS, PB, A/C, Dark Olive / White. |
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