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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Speedo Cable Leak

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G3GM :: G3 Tech :: Engine & Driveline

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Speedo Cable Leak Empty Speedo Cable Leak

Post by Hawk03 Fri Apr 03, 2020 2:58 pm

I think my bullet where my speedo cable attaches is leaking. I'm not sure what I need to order to replace it and stop the leak. Are the bullet's universal to install every TH350 or do I need to search for a specific one? Below are some pics and a couple of videos and a previous thread on the issue as well.

Can I replace without taking the housing off?

Speedo Cable Leak 20200410
Speedo Cable Leak 20200411

https://www.youtube.com/watch?v=H-3Fk5X7p2o
https://www.youtube.com/watch?v=QNw0Rp_INL0

https://www.g3gm.com/t7532-leaking-transmission

https://www.summitracing.com/parts/tci-880021?seid=srese1&gclid=CjwKCAjwvZv0BRA8EiwAD9T2Vd2CoLRDkbZNfayXp03UP1EFMMenW9asILpLLhIZ6ezYF4EHz57GxRoCUJYQAvD_BwE
Hawk03
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Speedo Cable Leak Empty Re: Speedo Cable Leak

Post by Joe73 Fri Apr 03, 2020 4:33 pm

Ive heard guys replacing the speedo cable seal.  The bullet on my manual trans just has an O ring on it.  
Maybe research this...

https://www.amazon.com/Housing-Speedo-Sleeve-Adapter-THM-TH-350/dp/B074YLY3FH
Plenty of info about that lead for a TH350.  

https://www.youtube.com/watch?v=H-3Fk5X7p2o
https://www.youtube.com/watch?v=QNw0Rp_INL0
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Speedo Cable Leak Empty Re: Speedo Cable Leak

Post by 73ss Fri Apr 03, 2020 6:17 pm

easy fix, take out the small bolt & retaining clip shown in your pic. Grab a drain pan and the bullet pulls right out. from the looks of the pic, the seal inside the bullet is leaking. remove it with a pick or something & replace. Should be easy to find a new seal.
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Speedo Cable Leak Empty Re: Speedo Cable Leak

Post by Hawk03 Mon Apr 13, 2020 9:42 am

Thanks guys, it was an easy fix. I installed a new bullet with orings but am going to order a set of new orings to keep on hand. Seems like a good thing to keep an extra one on hand for next time.

Speedo Cable Leak 20200422
Speedo Cable Leak 20200423
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