Tranny oil for 2011 Fatboy ??

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Sep 1, 2011 | 06:14 PM

#11

Willie D

Road Master

Joined: Feb 2006

Posts: 781

Likes: 3

From: 85.38W 42.13N USA

trany oil

Quote:

Originally Posted by BassCatcher

I will second the Mobil 1, 75-90 for the trans. $7.59 at Autozone.

Yup what he said

Been using this combination since 2002 . . .

http://

Sep 1, 2011 | 06:21 PM

#12

Stiggy

Seasoned HDF Member

Joined: Nov 2010

Posts: 17,548

Likes: 7,207

From: Oxford, Nc

Mobil 1 75W-90. Bike just turned 93,000 miles last week, no issues, no leaks...

'nuff said

Sep 1, 2011 | 06:44 PM

#13

wiktor

Thread Starter

Tourer

Joined: Jan 2011

Posts: 266

Likes: 1

Thanks for all the reply's! I thought running gear oil such as 75-90 was corrosive to soft metals in the tranny?? Also, wouldn't running Mobil 1 15W-50 be almost the same as running Syn3? Any negatives with the Formula+? Thanks!

Sep 1, 2011 | 07:06 PM

#14

watchluvr4ever

Road Captain

Joined: Jan 2010

Posts: 678

Likes: 0

From: MI

I've not read of any negatives about Formula+ other than most change it out because they want synthetic.

Sep 1, 2011 | 07:17 PM

#15

Jackie Paper

Seasoned HDF Member

Joined: Mar 2010

Posts: 38,655

Likes: 6,455

From: Honah Lee

Just my opinion but I would not run any thicker lubricant in transmission then Harley says. Some people think they need to quiten the clunk which is the square drive dogs dropping in. The gear teeth are always engaged. Problem lies in the small needle roller bearings in the inner input shaft that runs in the outer output shaft. Too thick and you have less chance of flushing crud thru. Usually the bearing are the hardest piece in there and they flatten the crud and move on. If they get stuck and start sliddings rather then rolling, the bearing life will shorten. Just my opinion.

Sep 1, 2011 | 07:47 PM

#16

olongapo1

Road Master

Joined: Oct 2008

Posts: 970

Likes: 19

From: Philippines

GRFOOO,

I partially agree with your opinion not to run thicker fluid than what the manufacturer recommends. I do run the 75W-110 Amsoil because it's Synthetic. I would not run this thick of a fluid in a straight fossil product.

Sep 1, 2011 | 08:04 PM

#17

King of beasts

Intermediate

Joined: Aug 2011

Posts: 49

Likes: 0

From: airway heights

Gear oil

Forget The rest AMSoil 75-110 as good as it gets since 1979

Sep 1, 2011 | 09:22 PM

#18

streeteagle

Club Member

Joined: Feb 2007

Posts: 2,404

Likes: 12

From: Haymarket, VA

Quote:

Originally Posted by lionsm13

Spectro HD Platinum 6speed Trans Oil 75/140

Best stuff that there is, bar none.

Details:
Heavy Duty Platinum 6-speed Transmission Oil: Designed by Spectro in response to complaints from Harley owners about the great but noisy new 6-speed transmission. This full synthetic provides ultimate lubrication protection. Formulated to significantly reduce gear noise and provide easier, smoother shifting. This SAE 75w140 formulation eases shifting when cold. High loads and extreme heat do not affect the oil, so it performs well when pushed hard and long.

There you go! Been using for 3 years in my Deuce. Best thing I've done for my bike.