T660 Turbo Chain Case Transmission Fluid? - ArcticChat.com - Arctic Cat Forum
4 Strokes Z1 Turbo / Z1 / T660

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post #1 of 12 Old 04-12-2019, 07:56 AM Thread Starter
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T660 Turbo Chain Case Transmission Fluid?

Hi,
I know this has been discussed a few years ago but, I'm really interested in why Arctic Cat can't answer a simple question;
What took place of the Arctic Cat transmission fluid for the reverse chain case? There has been three different part numbers and now none can be found.
Part numbers:
4639-364
0636-817
5639-039

I see that several people here on the forum are using all kinds of different fluids for these chain cases. Makes it pretty hard to really pin point what's the best to use. I'm not complaining to you fellow members here. I know you're taking the ball that AC dropped. It's just too bad that AC hasn't addressed/recommended a replacement. Thanks, Ray

Last edited by CrazyRay; 04-12-2019 at 07:59 AM.
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post #2 of 12 Old 04-12-2019, 08:15 AM
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Well you can use the 6639-538 Chain lube which I use in mine or the 6639-539 Synthetic Chain Lube in which both are the 15 ounce container. You won't use all of it in a T660.
If you type the 5639-039 number on Country Cat, the 6639-539 comes up.

Current Sled rides
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2006 T660 Turbo Touring
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1980 El Tigre 6000

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RTR Bushings & shock bushings
Motobatt Battery


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Motobatt Battery
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post #3 of 12 Old 04-12-2019, 08:56 AM
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You'll get 15 different answers from 12 people on this topic. They all range from personal preference, proven methods, and dealer brainwashing.

That being said, I been using 12 oz of left over Mobil one 5w-30 from a 5 gallon jug after changing the oil for over 10 years.

Never underestimate the power of stupid people in large numbers.
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post #4 of 12 Old 04-12-2019, 09:04 AM Thread Starter
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Quote:
Originally Posted by 660catman View Post
Well you can use the 6639-538 Chain lube which I use in mine or the 6639-539 Synthetic Chain Lube in which both are the 15 ounce container. You won't use all of it in a T660.
If you type the 5639-039 number on Country Cat, the 6639-539 comes up.
Thank you for the help....... very much appreciated. I would have to agree that you're using the correct chain case oil 6639-538. I know the discontinued part number was non-synthetic as well because I have the old 12oz. bottle. I would imagine the 6639-539 would be fine upon changing out the 6639-538. Thanks again. Ray
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post #5 of 12 Old 04-12-2019, 09:28 AM Thread Starter
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Quote:
Originally Posted by Tacanmech View Post
You'll get 15 different answers from 12 people on this topic. They all range from personal preference, proven methods, and dealer brainwashing.

That being said, I been using 12 oz of left over Mobil one 5w-30 from a 5 gallon jug after changing the oil for over 10 years.
Thanks for the help....... I totally agree with you. It appears that 660catman above is on track as far as AC oil. Thanks again, Ray
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post #6 of 12 Old 04-12-2019, 09:59 AM
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Quote:
Originally Posted by Tacanmech View Post
You'll get 15 different answers from 12 people on this topic. They all range from personal preference, proven methods, and dealer brainwashing.

That being said, I been using 12 oz of left over Mobil one 5w-30 from a 5 gallon jug after changing the oil for over 10 years.
And this is why I use Cat oils and lubes. No brainwashing here, just keeping my brain from overthinking all the suggestions and opinions lol.
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Current Sled rides
2005 Sabercat 600 EFI LX
2006 T660 Turbo Touring
2016 Bearcat 2000XT

Past Sled rides
1993 Pantera 550 EFI
1980 El Tigre 6000

Current ATV rides
2005 A/C 300 manual 4x4
RTR Bushings & shock bushings
Motobatt Battery


2003 A/C 400 auto 4x4 FIS
RTR Steerlites & Shock Bushings
Motobatt Battery
26" Kenda Bearclaw HTR's


Past ATV rides
2003 A/C 400 manual ACT 4x4
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post #7 of 12 Old 04-12-2019, 11:26 AM Thread Starter
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Just ordered the 6639-538 Chain Oil........ Thanks for the help guys.
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post #8 of 12 Old 04-15-2019, 08:37 PM
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Crazy Ray not that you got the wrong stuff, but just to give you an example, My old 69 and 70 panthers had a tin; "Ham-Can" chain case and they notoriously leaked. Back in the day and even the ones I restored I just shlobbered wheel bearing grease on the chain, it never mattered. I think in this case just about everyones right

Owning a Thundercat is like having a totally hot wife..... All of your friends want to see it, feel it and check it out..... They all want to know what it is like to ride it, but if they only knew how much time and money it takes to keep one up, they would call you a fool!

Seen in a DOO forum

"Of all the 850 vs Sidewinders/Thundercat/ZR 9000's; you are the first I have ever heard that beat one. I know the 850 is strong but it's down 30 hp from the turbo sleds.
I have a low slung fully built( by a well know engine builder) 3 cylinder 800 cc that made multiple dyno pulls over 200 hp on a calibrated Land and Sea dyno and I barely pull my buddy on his stock Thundercat. And I do have video."

Things on NASA headphones that are not good;
"That supposed to be like that?" "What the hell was that?" "Did you just pee in your spacesuit"
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post #9 of 12 Old 04-16-2019, 05:51 AM Thread Starter
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Quote:
Originally Posted by guudasitgets View Post
Crazy Ray not that you got the wrong stuff, but just to give you an example, My old 69 and 70 panthers had a tin; "Ham-Can" chain case and they notoriously leaked. Back in the day and even the ones I restored I just shlobbered wheel bearing grease on the chain, it never mattered. I think in this case just about everyones right
I hear ya...... The main thing here is lubrication along with pickup of the oil keeping the chain well lubricated. I totally agree that different varieties of oil could be used for this chain case. In my case, I haven't had any leaking issues with my T660 using the AC thinner viscosity transmission oil. "Knock on wood...... LOL. Thanks for your input. Ray
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post #10 of 12 Old 04-16-2019, 07:45 PM
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You know that i think of it, I even used 80/90w once , Like you said it's just so the chain gets "something". Heck look at bikes, what do they get?

Owning a Thundercat is like having a totally hot wife..... All of your friends want to see it, feel it and check it out..... They all want to know what it is like to ride it, but if they only knew how much time and money it takes to keep one up, they would call you a fool!

Seen in a DOO forum

"Of all the 850 vs Sidewinders/Thundercat/ZR 9000's; you are the first I have ever heard that beat one. I know the 850 is strong but it's down 30 hp from the turbo sleds.
I have a low slung fully built( by a well know engine builder) 3 cylinder 800 cc that made multiple dyno pulls over 200 hp on a calibrated Land and Sea dyno and I barely pull my buddy on his stock Thundercat. And I do have video."

Things on NASA headphones that are not good;
"That supposed to be like that?" "What the hell was that?" "Did you just pee in your spacesuit"
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