Thread: Non-threaded 3/4" hole in Tremec 3550. What is it ?
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Old 05-31-2010, 04:47 PM
Ronbo Ronbo is offline
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Yep, that sounds like the mechanical speedo hole. You can verify with the manual available here:

http://ttcautomotive.com/English/onl...er/product.asp

The electrical speedo sender is on the opposite side.
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