I’ve read a bunch of threads on this subject. Seems a lot of people use shock proof. I was looking to go with the belray vtwin.

I have a well trusted friend of over 20 years that has worked at in the Harley service dept for over 20 years. That’s how I met him actually. He said that essentially every trans they have seen with a failure was gummed up with shock proof.

Not trying to slam the product because i see lots of people on here use it. Just passing along what I have been told. I even bought some to use, and now it’s just sitting in my storage cabinet.

Was going to run the belray in the trans and primary on my next service interval.

I’ve used the mobil1 and the amsoil in all my bikes. They both seem to perform sufficiently.

Just looking for feedback on the belray specifically, and to pass along what I was told about the shock proof.

Cheers and ride safe. There’s an idiot updating their snapchat profile and driving at this very moment.

I used to use Redline Shockproof in the transmission of my 2012 Glide for a few years.
I have since changed over to Bel Ray Big Twin Transmission Oil and am very happy with it.
Mike U.

Either one will give you good service.

Most techs don't like shockproof. But I think its in no small part about the difficulty in cleaning the trans up when they work on them. The shockproof is like trying to clean up spilled glue.

i've not heard of any oil related failures, be it transmission, engine or primary. that said, shockproof is good for telling if you have a leak, nothing else on your bike is that pepto color

personally, $20 for a qt of shockproof, vs $6 for a qt of full synthetic supertech 75-90. both good for 20,000 miles. i'll stick with the supertech.

From the little info I’ve found on it, people seem to swear by it. Thanks for giving your experience with it.

I found the Belray for $8 a liter on rockymountainatv. Seems like a good price. Ordered enough to do three bikes. Free shipping by that point. I’ll give it a go on the next service.

Teds in Alton IL sells shockproof. And if they service your bike. That is what they'll put in the tranny.

Ran shockproof for 30k in last bike with no issue.. Have also run Amsoil 75/110 with no issue 50k with that.. So pick your posion...

Thanks for that info!! They also have spectro gear oil oil at that price point..and the belray primary at $9..nice!!!

That’s a great price for it, Trintcole.
Rocky Mountain ATV always has great prices and Customer Service.
Mike U.


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for primary oil, i use shell rotella t 15w-40. can buy it almost anywhere, my local advance auto has it for about $15 for a gallon jug. enough to do almost 4 oil changes.

i change mine every 5k along with the engine, even though the manual specs 10k on the primary. when i had a cable clutch, i would do the primary change and adjust the clutch every engine oil change. kept the bike feeling 'new'.... now, with the hydraulic clutch, no adjustment, but still continue to change the primary oil every 5k to get all the crud out of there.

oh, and the rotella t is jaso rated for wet clutch use.