Trans fluid
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2nd Gear
Joined: Nov 2019
Posts: 6
Likes: 0
From: Philly area
Trans fluid
2015 Fatboy lo 103 TC, cams .o30 head gaskets. What's the best trans fluid to run? Currently running vtwin trans fluid. I feel it may be too thick. Feel like clutches aren't grabbing for a sec at very high rpms..
Outstanding HDF Member
Joined: Oct 2016
Posts: 2,530
Likes: 546
From: Wayne County, PA
Gear oil. A transmission is just a bunch of gears. I always used 75w-90 whether it be in a evo or twin cam. In the evo i use regular dino oil and in twin cams I would use synthetic.
Cruiser
Joined: Jul 2014
Posts: 122
Likes: 71
From: Indiana
Cadipietro - You really should ask this question in the Softail Models section, this one is for 2018 and up Softail.
With that said transmission oil tends to be heavier in a HD, your manual can give you the correct weight required and any quality brand should be fine.
If your clutch is slipping you probably need to adjust your clutch, refer to your manual or take it to a shop.
Good luck
With that said transmission oil tends to be heavier in a HD, your manual can give you the correct weight required and any quality brand should be fine.
If your clutch is slipping you probably need to adjust your clutch, refer to your manual or take it to a shop.
Good luck
Seasoned HDF Member
Joined: May 2008
Posts: 21,134
Likes: 12,695
From: South Carolina
No....
Automatic Transmission Fluid is for automatic transmissions.
Automatic Transmission Fluid is for automatic transmissions.
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Tourer
Joined: Jul 2008
Posts: 295
Likes: 87
From: Portland, OR
I agree. In the transmission--which is separate from the primary and crankcase, gear oil is really the best option. The high-sulfur content helps with the shear and EP (extreme pressure) on the gearsets. Gear oil is also more suited for transmission as the gear oil additive package helps against aeration and foaming.
