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#1 |
Chance
![]() Join Date: Sep 2001
Location: Belcourt ,ND, USA
Posts: 750
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TH400 Leak fixed..new problem. Please Help.
I was finally able to get my TH400 to stop leaking. It was the speedo housing o-ring and speedo gear drive seal. Well I replaced those and it stopped leaking. Great... So I thought.
After a few miles with a smile on my face I noticed my speedometer making a winding noise. I removed the speedo cable from the dash and the noise was still there but not too bad. I thought it was the speedo so I grabbed a known working speedo from my stash and it still made the noise but not as loud. Next I removed the Speedo cable from the truck and removed the cable to clean and grease it. When I reinstalled it the noise was still there but not as bad. I am leaning towards the speedo gear housing being the problem but visually the housing and gear look fine. It seals so no leaks. Has anyone had a similar problem like this before. I want to get this issue resolved because my 17 year old nephew has been asking me all winter to let him use my truck for his prom. Well I agreed and his prom is this coming Saturday.
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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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#2 |
Registered User
Join Date: Jan 2007
Location: Topeka,KS
Posts: 778
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Re: TH400 Leak fixed..new problem. Please Help.
You could have a kink in your cable. I wouldn't think if it was the gear that the sound would travel that much.
__________________
68' C20. 283CI w/55CC 305HO heads, NP435 Close Ratio, Corp. 14 bolt FF 3.21, 75' front end swap (everything but the X-member). |
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#3 |
Chance
![]() Join Date: Sep 2001
Location: Belcourt ,ND, USA
Posts: 750
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Re: TH400 Leak fixed..new problem. Please Help.
The cable it just the right lenth. I actually tried two. The th400 cable and another one I have laying in the the garage. The noise did not start until I put a new o ring and seal on the speedo gear housing. The are no kinks and does not appear to have any extreme bends.
This is a weird issue. Any help is greatly appreciated.
__________________
1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400 |
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#4 | |
Registered User
Join Date: Feb 2009
Location: southeasternfoothillsofusa
Posts: 1,557
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Sam |
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#5 |
Chance
![]() Join Date: Sep 2001
Location: Belcourt ,ND, USA
Posts: 750
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Re: TH400 Leak fixed..new problem. Please Help.
I will try that. I am going to go get some white grease tomorrow. I will soak the cable in a coffee can with transmission fluid for a day and then coat in in white lithium grease then reinstall and hope for the best.
__________________
1968 Chevrolet Stepside BB 396 w/TH400 1972 Chevrolet 3/4 Ton 4x4 BB 496 w/TH400 |
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