I have a 2004 4WD EX that I bought new. It has 40K miles on the clock and has been towed about that many miles behind my motorhome (towed miles don't register on the odometer). So a total of about 80K miles on the running gear. Recently, I started hearing a whine that shows up at about 30 mph and varies in frequency with speed. Don't hear it much above 45 mph because it's drowned out by road/wind noise. Whine does not change if I shift into neutral.
The transmission had a drain and fill (by the dealer) about 4 years ago (~25K miles driving + 20K towing). Manual says change the ATF at 120K miles or 6 years then every 90K miles or 5 years. Honda does not consider towing behind an RV to be severe service.
Took it to my local Honda dealer today. They hooked up their diagnostic gear and took it on 3 test drives. They say there is a loss of pressure in 3rd gear and the transmission needs to be replaced at a cost of ~$4000 including labor.
I'm not trying to find the cheap way out, but throwing away an otherwise good transmission for a whine that I can't even hear when the radio is on seems extreme to me. The transmission has never slipped and the shift quality is as good as the day I bought it.
I'm 70, so not really up to any big DIY project, but could probably manage to do the drain and fill 3 times that I've seen described. If you think that would help, is DW-1 truly the replacement for Z-1 ATF. When I searched the net for a good price on Z-1 all I could find was DW-1.
What do you think? Thanks for any replies/advice...