Hello everyone, I have a couple of questions about the transmissions in the 1st gen FX's that I'm hoping some of the members here may have some expertise in. First some background info: I've had a 2003 FX35 since new and still use it as a daily driver. It has been my favorite all around car and the most versatile that I've ever owned. I also have a 2010 G37xS and an older 350z and I prefer the FX over them both. However, the FX is starting to show its age and its history isn't perfect. In 2012 at 74,000 miles it suffered the transmission cooler rupture in the radiator. At the time, the dealer diagnosed the transmission as toast and quoted a reman replacement at $5500. That was the last time the FX has been to a dealer. A trusted independent mechanic replaced the radiator, flushed the cooling system and drained and filled the transmission a couple of times and the FX lived. Fast forward to present time and the FX is still going at 200,000+ miles. However again, the transmission is going to eventually need service. So finally, my questions are: what is the difference between transmissions in the 2003-2005 models and the 2006-2008? What would prevent a 2007-2008 (or any 2003-2008) transmission from going into my 2003? As long as the configuration is like for like, i.e. AWD 2008 to AWD 2003, is there anything that will prevent it from being a happy marriage? Infiniti has multiple part #'s for transmissions and even multiple part #'s within particular model years, but is there any difference besides updates and revisions. The valve body could be different, but would it still work and require only a flash from the dealer or would there be a conflict between the ECM and the TCM that couldn't be resolved? Sorry for the long post, just trying to expand the possible options while I'm nursing my old tranny...
Transmission compatibility in 1st gen FX's?
- Thread starter r1isfast
- Start date
Thanks for reply. Considering a trans rebuild, yes. That may be the simplest and most logical path. Unfortunately, those are two qualities that I'm not often accused of. My old timer mechanic always favored the used replacement route mostly because his supplier offered a reasonable warranty on time and mileage that also covered the cost of labor for warranty replacement. (He probably gets a kick back too). It may or may not be a good tranny but if you get a bad one, they replace it and cover the cost of replacement. It's not my favorite path, but if the cost is low enough I like the idea of a replacement, paying the core fee, and keeping my own transmission for a rebuild while seeing how far a used replacement makes it. The idea I have though is if I happened to find a pristine or near mint transmission (at a good price) that isn't the exact year and part # of mine, would it work? It may be a case of the only way to know is try it and see.