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Hey

On the servo cover there are three bolts that hold on the cover. what is the small bolt/plug on the bottom right for? Thanks
 

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Hey

On the servo cover there are three bolts that hold on the cover. what is the small bolt/plug on the bottom right for? Thanks
I imagine you are talking Powerglide.


The small port is for a pressure reading.
 

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You can read both low and high gear line pressure there. In low there's pressure on the outside of the piston; in high on both sides. Some later Glides had a separate port in the case ahead of the servo area that you can read just high pressure at. It was used for a spark retard switch.
 
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