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Old 12-13-2011, 08:14 PM   #1
domeier
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th350 speedo leak

My speedo cable adapter is leaking at the trans, but I don't see the adapter pictured in the manual. I don't want to open it up without knowing what's in there. Any trick to it, or just pull it out and match the o-rings?
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Old 12-13-2011, 08:22 PM   #2
dmwphoto
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Re: th350 speedo leak

just pull it apart. the problem will likely reveal itself
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Old 12-14-2011, 12:39 AM   #3
dmack91
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Re: th350 speedo leak

Check here:

http://67-72chevytrucks.com/vboard/s...t=th350+bullet
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Old 12-14-2011, 10:41 PM   #4
hayhauler71
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Re: th350 speedo leak

GM# 345215 this is the part you may be looking for
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Old 12-15-2011, 12:57 AM   #5
domeier
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Re: th350 speedo leak

Thanks, hay. Also, I forgot to ask: I don't need to drain off the trans fluid - right?
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Old 12-15-2011, 11:58 AM   #6
gcburdic
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Re: th350 speedo leak

domeier.....when I changed mine, I jacked the back of the truck up (put blocks in front of the front wheels)...some fluid will leak out, but jacking it up may limit it....
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Old 12-15-2011, 05:47 PM   #7
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Re: th350 speedo leak

If it is leaking between the bullet and the case, an o-ring may fix it. If it is leaking between the speedo driven gear and bullet and coming out around the cable, then you need a new bullet and driven gear. The steel bullets are much better than the aluminum ones. Very common problem with aluminum ones.
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Old 12-15-2011, 06:03 PM   #8
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Re: th350 speedo leak

It's raining today, so I ain't getting under no truck. Appreciate all the replies.
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