Interesting post. Never heard this explanation before. Some questions:

Were both c900 and ng900 molybdenum-coated synchros manufactured from the same materials, using the same design, same manufacturing process, and by the same vendor?

Where does one purchase all-brass synchros -- from a source other than Saab? I don't see in my parts catalog part numbers that supercede moly-coated rings.

How do you (or Saab?) correlate trim level (S vs. Base) with owner shifting technique? Owning a higher trim level means nothing more than the owner wanted more features; it says nothing about their ability to operate their vehicle. Further, cars are often driven by multiple family members.

Where can I find these warranty statistics? Can you post the TSB numbers? What about failure rates in Turbos?

I'm confused by your statement that "more non turbo 5 speed had P/B
failure than Non turbo "Plain Jane" models." Did you mean the opposite?? You wrote that "Serious and performance...drivers fast and correctly shifted" their [S models]. Why, then, did S models have more failures if they were being "correctly" shifted? Furthermore, how is it possible to conclude that drivers in one trim level versus another somehow have "better" shifting technique or driving habits?

(Remember, too, that from 86-88, S models were 16V vs. 8V Base models. What are the stats for non-turbo cars during these years?)

What about metal bits in the oil from poor reverse shifts (chipped teeth); NO specified gear-oil change interval; exposure of the gear oil to high heat; pinion crush sleeves that can give due to shock-loading (wheel hop); claims that pinion bearing pre-load from the factory was sometimes out-of-spec; and claims that the pinion shaft length adversely affects pinion bearing life due to excessive length?

In other words, there are lots of potential causes. And correlation is not causation.

posted by 67.183.141...

• 5 speed with all brass syncros, Don Wollum, Sat, 2 Dec 2006 05:36:31
  • Re: 5 speed with all brass syncros, Hans, Sat, 2 Dec 2006 14:53:15 <-- Viewing This Message
    • Wow., RayF, Sat, 2 Dec 2006 15:17:56
      • Re: Wow., DonWollum, Sat, 2 Dec 2006 17:35:58
  • Cool, but why post this now?, Chaz, Sat, 2 Dec 2006 08:59:25
    • Reading it kept me out of trouble for 2 minutes., MS, Sat, 2 Dec 2006 12:52:44
      • Re: Reading it kept me out of trouble for 2 minutes., pjkbrit, Sun, 3 Dec 2006 10:11:35
    • Gunning for Scott's information award?, JohnB, Sat, 2 Dec 2006 09:34:57

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