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02-08-2014, 07:13 PM
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#1 |
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Member
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Location: san antonio tx
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TH-350 Speedometer Plug Size
What's the best way to plug the speedometer cable hole on a TH-350? Use an old cable setup or what size plug?
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02-08-2014, 08:59 PM
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#2 | |
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Veteran Member
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Re: TH-350 Speedometer Plug Size
Quote:
I usually use a rubber expandable plug ..Just install it dry. I mean brake clean dry!
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"We are lucky we don't get as much Government as we pay for." Will Rogers |
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02-08-2014, 10:30 PM
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#3 |
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Re: TH-350 Speedometer Plug Size
Mark
I knew you would know the diameter but where the hell would I find that plug? I'm going to the junk yard tomorrow to finish stripping a 305 short block. What would I need from a TH-350 to plug the hole properly? |
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02-08-2014, 10:39 PM
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#4 |
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Re: TH-350 Speedometer Plug Size
If you have an old head I would just use it...has an o-ring if I remember right.
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Rich Taylor I/SA - 321 |
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02-09-2014, 10:52 AM
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#5 | |
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Re: TH-350 Speedometer Plug Size
Quote:
how about a metric freeze plug? I'm assuming it's the large speedo adapter rather than the small "bullet"....
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without losers,winning means nothing. |
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02-09-2014, 11:04 AM
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#6 |
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Re: TH-350 Speedometer Plug Size
Depending on the size you might consider a boat/livewell type expanding plug.
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Rich Taylor I/SA - 321 |
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02-09-2014, 11:13 AM
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#7 |
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Re: TH-350 Speedometer Plug Size
Sonnax Transmission Parts
Part # 35922-01K. TH350 Speedometer Hole Plug. During high performance rebuilds, the speedometer gear is often removed and replaced by a freeze plug. However, in addition to being used for driving the speedometer, the gear is also critical to lubricating the rear output shaft bushing. This new speedo plug supports the speedometer gear and allows lube to flow as the original design intended. The gear shaft has to be cut to 1.320" long. Cost $24.00  http://www.transmissioncenter.net/So...uper_Store.htm
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Rick Blake 2395 SG, SC, SP |
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02-09-2014, 11:18 AM
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#8 |
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Re: TH-350 Speedometer Plug Size
That being the case then the original stock head would seem to be the way to go after all.
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Rich Taylor I/SA - 321 |
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02-09-2014, 11:30 AM
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#9 |
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Re: TH-350 Speedometer Plug Size
I will need solid engineering proof about the statement "helps lube rear bushing"
Just consider the units in service with speedo adapter hole plugged yet they experience normal rear bushing service life.
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Larry Woodfin 471W |
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02-09-2014, 12:06 PM
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#10 |
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Senior Member
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Location: Southeast Michigan
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Re: TH-350 Speedometer Plug Size
The spinning governor provided the needed lube for the rear bushing. This was true for the 700-R4 also. When the transmissions were redesigned to the "e" versions, a hole was drilled that pee'd fluid back to lube the bushing.
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