Second thoughts on changing AOS

[911monty]

Originally Posted by JFP in PA

If the unit is bad, it will be bad right out of the box. I would not be afraid to install it, but test it afterwards (we use a digital manometer, but you can rig up one from a yardstick and some plastic tubing). On a cold start, you should see 4-7 inches of water vacuum, which should level out to 5 inches or water as the car warms up.

We test every car that comes through the shop, regardless of why it is here, and we automatically replace the AOS on any car that we pull the trans out of for whatever reason, particularly 996's.

There isn't a whole lot of rhyme or reason why these things are what they are, but I would bet on a new unit over one with nearly 100K on it.

Thanks JFP for the quick response. Your last sentence is exactly why I am considering changing it! Should have everything here by Thursday to change out. Thanks again.

Monty