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Red Line 42804 V-Twin Transmission Oil with ShockProof Fluid - 1 Quart

4.7 out of 5 stars 151 customer reviews
| 10 answered questions

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Frequently Bought Together

  • Red Line 42804 V-Twin Transmission Oil with ShockProof Fluid - 1 Quart
  • +
  • Red Line 42904 V-Twin Primary Case Oil - 1 Quart Bottle
  • +
  • K&N KN-171C Harley Davidson/Buell High Performance Oil Filter
Total price: $47.96
Buy the selected items together

Product Information

Technical Details

Brand Red Line Oil
Model 42804
Item Weight 1.7 pounds
Product Dimensions 16 x 12 x 10 inches
Origin China
Item model number 42804
Manufacturer Part Number 42804
OEM Part Number 42804

Additional Information

ASIN B004X973EA
Customer Reviews
4.7 out of 5 stars 151 customer reviews

4.7 out of 5 stars
Best Sellers Rank #4,344 in Automotive (See top 100)
#14 in Automotive > Oils & Fluids > Transmission Fluids
#14 in Automotive > Replacement Parts > Engine Cooling & Climate Control > Coolers & Accessories
#24 in Automotive > Replacement Parts > Transmission & Drive Train > Transmissions & Parts
Shipping Weight 2 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available January 30, 2010

Warranty & Support

Warranty, Parts:Parts

Product Description

This product dampens transmission noise (reducing the notorious shifting clunk found in these gearboxes) dramatically reduces temperature provides thicker oil films between gear teeth and resists throw-offFor all aftermarket versions like Baker JIMS S&S etc.For all H-D trans including with Evolution engines Twin Cam engines and latest 6-speed Cruise DriveSame fluid as our unique Heavy ShockProof Gear OilMotor oils and gear oils are specifically engineered for the latest high-revving four-stroke motocross bikes and ATVs Sport bikes and V-TwinsEach gear oil product reduces the thinning effect from high temperaturesMotor oils are packed with higher levels of anti-wear chemistry like zinc and phosphorusSpecial friction modifiers in our motor oils better wet-clutch operationA variety of Two-Stroke oils to meet the NMMA TC-W3 regulations where required

Customer Reviews

Top Customer Reviews

Verified Purchase
I've always used Mobil 1 for my H-D Ultra Classic because it was recommended by a H-D dealership mechanic. He recommended using it for all three holes (oil, transmission & primary). I've had no complaints whatsoever with Mobil 1. I decided to tackle the latest fluid change myself. I did some research and decided to try the Red Line brand and I bought their area specific fluids; that is, Red Line 20W-50 Oil, Red Line V-Twin Primary Case Oil & Red Line V-Twin Transmission Oil. The only area where I noticed an immediate improvement was with the transmission - remarkably smoother and quieter shifts. The primary - nothing good or bad that I noticed. My Ultra has always had minor pinging under load uphill during hot weather. I thought it was something with California fuel but I always run high octane and everything is mapped. It wasn't a big deal, just annoying. I noticed that after using Red Line oil, the pinging (or what I thought was pinging) is completely gone. Maybe it has something to do with dispersing heat or controlling heat. I'm so happy. It costs more than Mobil 1 but to me it's worth it. It just seems right to me to use the three area specific oils. I'm sticking with Red Line.
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Verified Purchase
Improved the noise when shifting over Harley Oil on my 2012, 103, Streetglide. It also seem to cut down on the transmission whine during warm/hot operation. IMO its worth the cost and recommend the ShockProofFluid.

Probably overkill but I also changed the Primary and Engine to Redline, cant speak what the results will be, however, I would think any oil made specific to components and conditions would make it happy!!

Almost forgot, the oil change was done late fall so I only got to ride it a couple of times before I winterized it. The engine noise that sounds like lifters etc, seems to have quieted this down, also, that being said it was later in the season and so the engine never got really hot, per-say. Darn, those 103s sure like to talk to you.
1 Comment 13 of 13 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Verified Purchase
This was the first time I had used anything other than the Harley labeled lubricant for the transmission on the Lowrider. I didn't expect that I would see as much difference as several of the other reviews had noted, but I was wrong. Transmission shifts smoother and neutral is easier to find. I have 31,000+ miles on this bike and I have owned it since it was new so I know how it has always shifted; it's not my imagination! Great improvement.
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Verified Purchase
Just performed the 1K service on my 2012 Harley FXDC, and ended up using the Redline tranny fluid instead of the Harley stuff. Very happy with my decision. Has quieted down the transmission considerably, and shifting definitely feels smoother. I also used the Redline Primary/MTL fluid in my primary. Very happy with both products, and will continue to use in my bike.
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Always had a hard time getting my bike into neutral. I used this along with Red Line V-Twin primary fluid, and it's a lot easier to fine neutral now.
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Verified Purchase
Redline products are great. Used in 09 Harley FLHTCU. Smoother shifting, easier to find neutral, did I say smoother shifting? Good stuff.
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Just used this on my 14 Harley Limited. First time user. I could not believe how much quieter and smooth the shifting was. I have never seen an oil make this much of a difference. Hands down the best trans oil I have found. This is the only oil for the trans I will ever use going forward.
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Verified Purchase
I got a new-to-me used bike with about 5,000 miles on it. The previous owner said the gear oil was recently changed but I had a difficult time shifting through the gears, especially downshifting and finding neutral. I changed the oil and am now experiencing easier shifting and not as much difficulty finding neutral. I'm happy the product helped my shifting. Gears don't seem any more quiet and upshifting seems unchanged; that strong thunking into first gear is still there but I don't see that as a problem.
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Red Line 42804 V-Twin Transmission Oil with ShockProof Fluid - 1 Quart
This item: Red Line 42804 V-Twin Transmission Oil with ShockProof Fluid - 1 Quart
Price: $17.95
Ships from and sold by Amazon.com