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#754926 - 10/26/06 06:36 AM Good transmission fluid for a 2006 HD Sportster?
Chris B. Offline


Registered: 03/16/03
Posts: 2856
Loc: Colorado
I'm wondering what a good tranny fluid would be? I hear Mobil 1 75w90 gear oil is a good choice. Is it better then what ever the HD dealer uses? Will it meet my warranty requirments? Thanks for any segestions!!!!

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#754927 - 10/26/06 06:37 AM Re: Good transmission fluid for a 2006 HD Sportste [Re: Chris B.]
Ned Nimrod Offline


Registered: 08/07/03
Posts: 12
Loc: Fort Pierce, Florida
That is what I use in my '05

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#754928 - 10/31/06 01:15 AM Re: Good transmission fluid for a 2006 HD Sportste [Re: Ned Nimrod]
cfromc Offline


Registered: 07/28/06
Posts: 734
Loc: Illinois
I've used it before with good results. Next season I'm trying Redline's MT-90 as it is specifically a transmission fluid and not a "gear lube" although they are likely very close to the same thing.

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#754929 - 10/31/06 02:36 AM Re: Good transmission fluid for a 2006 HD Sportste [Re: cfromc]
Mr. Boston Offline


Registered: 10/12/05
Posts: 231
Loc: Kansas
Isn't that a bit heavy? I'll be changing my Sporty fluid in the spring.

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#754930 - 10/31/06 08:20 PM Re: Good transmission fluid for a 2006 HD Sportste [Re: Mr. Boston]
Norm Olt Offline


Registered: 01/27/03
Posts: 1814
Loc: Pac NW
Amsoil makes an excellent 75W-90 product, too!

I guess you could always give one of the synthetics a try: you'll know which one shifts best before very long.

Cheers!
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#754931 - 11/04/06 04:59 PM Re: Good transmission fluid for a 2006 HD Sportster? [Re: Chris B.]
KBFXDLI Offline


Registered: 01/30/06
Posts: 719
Loc: Ohio
I do believe the Sportster has a shared primary & trans sump so I would try Mobil1Vtwin 20w50

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#754932 - 11/05/06 11:07 AM Re: Good transmission fluid for a 2006 HD Sportster? [Re: KBFXDLI]
Chris B. Offline


Registered: 03/16/03
Posts: 2856
Loc: Colorado
Isn't the primary the tranny?

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#754933 - 11/05/06 06:27 PM Re: Good transmission fluid for a 2006 HD Sportste [Re: Chris B.]
Mike_dup1 Offline


Registered: 11/17/02
Posts: 3001
Loc: USA-Michigan
from HD spec;s it says;

Primary Drive - Three-row chain
Transmission Type - Constant mesh, foot shift
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2012 Sierra Denali
2009 Cadillac CTS4
2010 John Deere X728SE
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#754934 - 11/06/06 12:26 AM Re: Good transmission fluid for a 2006 HD Sportste [Re: Mike_dup1]
cousincletus Offline


Registered: 09/25/02
Posts: 2513
Loc: Richmond, VA
I used nothing but H-D Sport Trans fluid in my 1992 Sportster. Worked well for me.
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Fleet: 08 Chevy Colorado, 08 Malibu (wife's), 04 Impala.

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#754935 - 11/06/06 01:56 AM Re: Good transmission fluid for a 2006 HD Sportste [Re: cousincletus]
cfromc Offline


Registered: 07/28/06
Posts: 734
Loc: Illinois
The primary shares fluid with the tranny, but they are two separate assemblies. The primary houses the sprocket coming off the engine, the chain that transfers power from that sprocket to the clutch, the clutch itself, and the alternator assembly. At the bottom of the primary there is a fluid passage to the transmission. I have used Sport Trans fluid with decent results but I have noticed an improvement in shifting with other fluids.

Since the fluid must provide lubrication for the transmission, I would not use an engine oil since it will quickly shear down. A 75W-90 gear lube or manual transmission lubricant (MTL) is basically the same viscosity as a 20W-50 engine oil yet is made to resist the shearing of the transmission gears. I have seen UOAs of 20W-50 that has sheared to a thin 40-weight oil in less than 3,000 miles when used in a Harley transmission.


Edited by cfromc (11/06/06 02:02 AM)

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#754936 - 11/08/06 07:12 AM Re: Good transmission fluid for a 2006 HD Sportste [Re: cfromc]
KBFXDLI Offline


Registered: 01/30/06
Posts: 719
Loc: Ohio
Quote:

The primary shares fluid with the tranny, but they are two separate assemblies. The primary houses the sprocket coming off the engine, the chain that transfers power from that sprocket to the clutch, the clutch itself, and the alternator assembly. At the bottom of the primary there is a fluid passage to the transmission. I have used Sport Trans fluid with decent results but I have noticed an improvement in shifting with other fluids.

Since the fluid must provide lubrication for the transmission, I would not use an engine oil since it will quickly shear down. A 75W-90 gear lube or manual transmission lubricant (MTL) is basically the same viscosity as a 20W-50 engine oil yet is made to resist the shearing of the transmission gears. I have seen UOAs of 20W-50 that has sheared to a thin 40-weight oil in less than 3,000 miles when used in a Harley transmission.




You are probably right about the shearing. But I used to change my oil in my Sportster at 3000 because of that reason. I now have a Dyna Low Rider which has seperate trans & engine & primary sumps and use Mobil1Vtwin20w50 in the engine, redline MTL in the primary and redline shockproof heavy in the trans. ALL work well. The best advice might be to call Redline and ask what they recommend for the Sportster shared sump. They seem to be very knowledgeable.
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#754937 - 11/08/06 08:49 AM Re: Good transmission fluid for a 2006 HD Sportste [Re: KBFXDLI]
cfromc Offline


Registered: 07/28/06
Posts: 734
Loc: Illinois
They recommended their 75W-90NS or their MT-90 to me. I've used their 75W-90 and 75W-90NS in the past and will have the MT-90 next season.

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#754938 - 11/08/06 03:06 PM Re: Good transmission fluid for a 2006 HD Sportster? [Re: Chris B.]
Big Dave Offline


Registered: 05/28/04
Posts: 178
Loc: Indiana
I don't know that the M1 75W-90 gear lube or any gear lube is suitable for a wet clutch application, certainly in a Big Twin with its seperate trans it would be fine. Also there has been some concern voiced on other forums of using gear lubes in this kind of application doing some damage to the windings in the stator.

I would think using what ever oil you use in the engine would be suitable for the trans/primary. In my Buell as well as my past Sportsters I've use M1 20W-50 in both holes with great results.

David
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#754939 - 11/09/06 08:12 AM Re: Good transmission fluid for a 2006 HD Sportster? [Re: Big Dave]
Chris B. Offline


Registered: 03/16/03
Posts: 2856
Loc: Colorado
I'm not up to date on the tranny/primary/wet clutch talk.

I'm under the impression that my 2006 1200 Sportster only has 2 fluids, the engine oil and the tranny oil....is that correct? What is a wet clutch? I think someone else answered that for me but I can't find it.

I was just wondering what a good tranny fluid would be besides what the dealer sells as they are a rip off!

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#754940 - 11/09/06 05:24 PM Re: Good transmission fluid for a 2006 HD Sportste [Re: Chris B.]
Mike_dup1 Offline


Registered: 11/17/02
Posts: 3001
Loc: USA-Michigan
Does your owners manual not spell out what fluids to use? Or does HD make it so hard to find out because they want you loyal to products they have? I have a friend who found out his dealer is a Ahole on that subject. He (the dealer) flatly refused to put Mobil in the bike for him (this guy won't get his hands dirty), its HD oil or take a hike! Really ticked him off. btw-He said the service guy was hardcore HD, tatoo's, clothing. was a walkingHD billboard and a jerk. Not sure where the dealer is but is in Northern Wis.
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2012 Sierra Denali
2009 Cadillac CTS4
2010 John Deere X728SE
2006 Honda Rincon 680

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