I changed to redline Heavy shock proof in the trans last service and it was quitter. And used the red line primary oil, the primary oil seem to let the clutch slip a couple times and the comp was louder so I immediately change back to formula+ and all was good.

Because the red line didn't work foe me in the primary it kinda left a bad tast for the red line products and I had read that the additives can fall out of the oil and build up behind gears and cause issues. So this service I changed the trans back to formula+ with more gear clunk and overall louder trans. Has anyone had issues using the heavy shock proof over extended time and a lot of miles??

 

I use redline in the engine and trans, but formula + in the primary.
Redline IMHO has great products but I noticed the same issues in the primary.
I have well over 50K with their products in the engine and tranny - no problems.

 

I heard the same and interested to know as well. Had Red Line Shock Proof in the tranny and switched to AMSOIL Trans at the last change. Sounds louder and definitely not as smooth. Also, went from Formula+ to AMSOIL Primary. No noticeable difference there.

 

Switched from Syn3 to Redline Shockproof in my trans and really could tell a difference in 5th gear wine. Much quieter. SHifting seemed a little less clunky

Had to get the shaft and primary seals replaced at the dealer and they replaced the trans fluid with Syn3 (no shockproof on hand, should have brought my own)

Anyway now its back to being louder and it starting to annoy me. Should switch back but sucks since I hate to waste $$ since I already paid for the Syn3.

Anyway, Baker used to recommend Shockproof for their transmissions. (they recommend a different brand now but I think that's because they got it custom spec'd for them) Either way its enough proof for me.

 

My dealer on my first oil change on my 2016 Ultra LTD said they are only putting Syn 3 in the crankcase and Formula + in the primary and transmission. According to their experience Formula + is quieter.

 

I've gone to Mobil 1 in the engine, but I'm sticking with Formula+ in the primary and trans. They work for me, no issues or problems, so I see no reason to switch.

 

Using Syn 3 in the engine, Belray in the trans, and formula + in the primary.

 

What weight Amsoil Gear oil? Is it regular gear oil or Severe Gear?
I've used Severe Gear 75w/90, 75w/110 and 75w140 in my trans and I like the 75w/140 the best. Smoother shifting and more quiet. Same weight as the Red Line gear oil...I think.

 

I ran the shockproof for 10k miles in the trans. Hated it! Neutral was a bitc*. Now I run Mobil 1 in engine and trans, formula in the primary. Happy dance!

 

Harley Formula+ works good in the Rushmore primary,,,ONLY!