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I had already did a custom blend before I saw your recommendation of 75% mtf and 25% atf+4. So my mix was 1 qt syncromesh and 1.5 qt atf+4. Not sure what I drained out but it was pretty dark and smelled bad. On the first test drive it shifted better. I will go with the mtf next time but didn't...

From my research atf+4 and gm synchromesh are both synthetic products. Please correct me if I'm wrong. Big plus for me is that they are very easily obtainable at most parts stores whereas redline etc you pretty much have to mail order and is pretty high priced compared to the others I mentioned.

I have an 05 dodge 1500 with the 3.7 and getrag 238 six speed. It's spec is ap4 which is atf+4. My question is, can I mix synchromesh with atf+4 to achieve better wear protection and hopefully better performance? Thanks.