I have a 2009 FLHTCU and I had the same problem. Clunked going into first and hard to get into neutral. 5th gear was very noisy. This has to do with the way they cut of the 5th gear. In 2010 they changed the type of cut. I changed to Amsoil Severe Gear 140W and it has helped the shifting alot and it quietened the 5th gear noise also.

 

Yes don't use Syn 3 in your engine, transmission, primary or lawn mower there are much better options.

 

i have a 10 ultra and the first time i dropped it into 1st, i thought something was wrong. Damn was that think loud. I've had my first 1000m service and switched to syn and its better but stull noisey. have occasional problems finding neutral. hope it gets better as time goes on.

cass

 

I just got a 2010 FLHX and I will switch to Amsoil at 1000 miles. Hopefully that will quite the clunk.

 

leave the oil in the motor, use gearlube in the gearbox.

 

It won't. Nothing will. Harley transmissions clunk.

 

HD trannys are built like a Mack Truck. Get used to it...Everything you say is normal for you bike.

 

redline shockproof....great improvement....but it will never be quiet!

 

+1 on the redline shockproof, great stuff!! made my 09 roadie quiet and smooth as butter

 

Get that engine oil out of the tranny and put some proper gear lube in. I use 75-110 Severe Gear by Amsoil in mine and it made a large difference.