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On 2002-02-27 17:52, nathankey wrote:
One more thing, at what mileage did you get your transmission flushed, and what type of oil do you run in your car.. Normally I run 5W-30 from Valvoline..
I had the trans fluid changed to Redline D4 ATF at about 400 miles after the new transmission was installed. People here have reported best results with GM Synchromesh, and Tremec (maker of the 3650) stated in a private email to me that it will work fine (they have tested with it). They also stated that a Texaco Dexron III ATF (non synthetic) also works well. Addtionally, they stated that manufacturers pick their favorite fluid based on efficiency and mileage, whereas Tremec tests for durability and long term shiftability. I had asked about Redline, Synchromesh, Neo, Mobil 1, etc., and they only commented on GM Synchromesh and Texaco Dexron III...
Redline D4 ATF meets the Ford specs, but I'll check with the dealer to make sure it's OK for warranty purposes. I know Redline makes more power at the rear wheels (than so called "standard" fluids), but I have no info regarding GM Synchromesh. People who reported no improvement with Redline (100% synthetic) reported an improvement with GM Synchromesh (apparently a partial synthetic). Since Tremec also recommended a non-synthetic, I'd guess that the Texaco Dexron III ATF might shift even better. The semi- and non- synthetics probably are not as efficient and may result in reduced fuel mileage and HP to the rear wheels (guessing less than 5 HP). So far my transmission is shifting as well as GM Synchromesh users, so if it's OK warranty-wise, I may just leave the Redline in there (I had considered switching to Synchromesh).