I bought some Red Line Shockproof over the winter thinking I'd put it in this spring. Moving the 07 Deluxe around I realized it can't shift any better than it does now...like butter (Amsoil SVG 75-90). Now I don' t know what to do.....just save the Red Line for now I guess.

 

Amsoil's 75W110 in the trans. I believe the 75/90 is too thin. The 75/110 is equal to the MCV 20/50 viscosity so that is why I run the75W110. I am using the MCV 20/50 in the engine. I have the Amsoil super shift in the primary and it is coming out real soon as the primary is very noisy on start up when cold and sat over night. Had the 25/50 in before and no noise from the prim.. I will put back in the 20w50 MCV in the prim., as I am now thinking that the ATF just runs off all the primary parts and therefore every thing is more or less running dry on start up or is it the fact that the 20w50 is so much thicker that it cushions the noise from the primary chain etc? No matter what, the Amsoil MCV 20/50 is back in. On their site is what they say to use, so 20/50 it is!! My 2 cents or 1. Ride safe and have a great day now eh.

 

I have a 2000 Big Dog and put the Redline in and it made it easier to get neutral, love it but looks like pepto.

Gonna put it in the RK when tranny oil is due change.

 

Redline Shockproof!

 

Guessing the previous owner, because of the dealer service records, used HD trans fluid. I just changed to Royal Purple 75/90 and the bike shifts alot smoother and it's easier to find first gear. Just my experience.

 

I was leaning towards the Mobil 1 75w90 for the trans, but I found these two comments from Mobil 1 engineers on the Mobil 1 website in the "Ask Mobil" section regarding use of this oil in the trans. It seems like they don't recommend it. Also, when you go to the Amsoil site, they don't recommend any of their gear lubes in the trans either, but rather their 20w50 synthetic oil in all 3 holes.

So I am confused, it seems like the engineers at both Mobil 1 and Amsoil recommend using their 20w50 synthetic motor oils in all 3 locations.

Mobil Site
Question: Does Mobil 1 Synthetic Gear Lube Corrode Yellow Metals?
Is Mobil 1 Synthetic Gear Lube LS 75W-90 gear oil OK to run in Harley Transmissions? The big buzz on the internet chat rooms is that it corrodes "yellow" metals, such as brass and copper. Is this true? Please answer THIS question.-- Michael Carravetta, Janesville, WI

Answer: Unless the transmission specifically recommends an API GL-5 fluid for your transmission, it should not be used. GL-5 gear oils are designed for gears that require a high level of EP (Extreme Pressure) additives to protect gear teeth under extreme stress. Unfortunately, these same additives can be very aggressive toward “yellow metals “and are generally not recommended where copper, brass and bronze components are used.

Question: Sorting Out the Lubes for a Harley-Davidson Dyna Wide Glide
I have read your question and answers regarding oils in a Harley with separate case, trans, primary. I have been using Mobil 1 V-Twin 20W-50 in all three holes. I am all about optimal product use and performance. Aside from 20-50 V Twin in the engine from what I have read it seems like Mobil 1 Racing 4T 10W-40 for motorcycles would be better in the primary, and 75-90 gear lube would be better in the trans. Is this correct? 2002 Harley-Davidson Dyna Wide Glide. Also I see you have a 75-140 gear lube. The manual does not specify weights of oil to use and it's one of Harley's marketing schemes to make you buy their oil.-- Michael Lawton, Howell, NJ

Answer: We recommend that you keep doing what you're doing and use Mobil 1 V-Twin 20W-50 in all three applications. By using a premium synthetic like Mobil 1 you are already using a high performance lubricant in your bike. Using Mobil 1 Racing 4T 10W-40 in your primary is an option but we would not recommend the use of an API GL-5 gear oil in your transmission. (Also see the question on API GL-5 gear oils in transmissions.)

Amsoil Site:
Recommended use of 20w50 synthetic motor oil for engine, trans, and primary:
http://www.amsoil.com/products/stree...oil_chart.aspx

 

The Same exact discussion goes on over in the Jeep forums.......I have not cracked open a Harley tranny.......but the yellow metals in the Jeep tranny's are the synchros......If the synchros wear = hard to shift. I run "Synchromesh" in my 5 speed jeep tranny.....it does not affect the yellow metals....it is a little expensive. I believe it is a synthetic 80 wt gear oil.

The problem with the jeep trannys have been improved with newer models...this problem has mostly affected late 80's to early 90's jeeps with the 5 speeds.

Have there been legitimate problems with the tranny's on harleys wearing out because of oils?

 

Haven't heard of any, on the street or in the forums...

 

I just put in Amsoil Sever Gear 75W/110 seems to shift smoother than the 75W/90

 

I didn't think so.....I just put the Supertech 75/140 synthetic in my RK tranny. Think the walmart supertech is made by Warren oil co.