Ok guys I know I've asked this question a few months ago, but I noticed on tower hobbies that there are 2 part numbers for the steel center shafts for the older versions of maxx trucks. The first number I found was TRX4949R made for the older #4909 tmaxx (I also have a 4910 tmaxx) and the length of those 2 center shafts are 3.34" (85mm). And the other part number I found was TRX4951R is 3.5" (89mm) and the price is $34.99. The TRX4949R is $38.99. I have a feeling my LHS ordered me the TRX4949R instead of the TRX4951R. What my question is, would I still be able to use the TRX4949R shafts on my 3906? Thanks for any info. I just want to make sure I purchase the right parts for my emaxx.