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I'm trying to find out if the GM Synchromesh #12345349 is the same as AC Delco #88900333. I bought 2 quarts of #12345349 2 yrs ago from my local dealership at $24/qt, and I think I may need about another quart. SummitRacing states that #12345349 is not available but offered #88900333 as a substitute at less than $9 a quart. I am thinking it's the same stuff. I do not have any miles on this transmission (TKO 600), and I would hate to have something go wrong.
This is what you need and is recommended by name, or was with my TKO. It is also less expensive. Be sure to change it after 500 miles. I did mine at 500 and again at the end of the summer with about 2000 more miles on it. Gets pretty expensive using the GM stuff.