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Discussion Starter · #1 ·
I purchased a belt from Rock Auto and it was too short, even after taking the belt tensioner to the maximum relief position.

It was a Motorcraft JK6844C. The equivalent Fort Part numbers listed by Rock Auto for this belt are:

4L8E8620AB
4L828620A

It was a couple of inches too short.

Does anyone know what the proper number is supposed to be?

There is another one listed which is JK6858A but I thought I’d check it before ordering. I have a 3 year old Continental “ Gator Back” on it but I’ve exhausted my other options and want to try a new belt. I have some other posts dealing with my saga of noise.
 

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85.5 inch belt for my 2005/2007 Taurus cars with 3.0 Vulcan. Look up Gatorback 4060855 belts. Should be on Ebay/Amazon. Gaterback are very quiet belts and forgiving. Awesome belt.
 

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85.5 inch belt for my 2005/2007 Taurus cars with 3.0 Vulcan. Look up Gatorback 4060855 belts. Should be on Ebay/Amazon. Gaterback are very quiet belts and forgiving. Awesome belt.
Gatorback is no longer made, the design went to Continental and now they have discontinued that.
-chart-
 

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Gatorback is no longer made, the design went to Continental and now they have discontinued that.
-chart-
I still see them on Ebay-- but I bought a couple as back up years ago and still have one in the package, so I didn't know. That is too bad, as it was a great design/idea. The part number should still be searchable to find a like-for-like replacement.





eBay item number:
132206476037
 

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^+1. Goodyear Gatorback became Continental Elite a while back. I still see them occasionally on Wholesaler Closeout at Rockauto.com. I recently bought a couple for my Impalas @ $10/ea.
 

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I run Gates K060850 on my cars, fits perfectly. Are you following the diagram for installing it?
Outside circumference is 85.63 In.
 

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Discussion Starter · #10 ·
Thanks everyone. I picked up a ACDelco Professional 6K850. The package says 2175 mm which is 85.6 inches. I mounted it and it went on fine. I measured my three year old continental elite belt. To measure it I put it on a nail hammered into a shelf, pulled it tight and measured it with a tape measure. It measured 42 inches x 2 but there is a bit more to go around the curve and double back. I’d say it’s 84 to 85 inches. Any way, the indicator on the tensioner shows some relaxation. I attached two shots showing the new tensioner being a bit too tight with the old belt and being OK with the longer AC Delco belt. Unfortunately the sound is still there. I’m going to try pull the power steering pump on the shaft a bit more as I see the belt riding a bit off center.

51465A81-BE67-4687-A986-E7DC7768927D.jpeg 2C73F405-5AC0-4152-9674-78D24137F8E7.jpeg 77D14773-4F79-4F60-AE64-5D8F74193870.jpeg A76A299E-4D68-46F3-9811-7D4B4C4DF886.jpeg
 

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Discussion Starter · #11 ·
A slight correction. Those two shots of the tensioner are both with the Continental Elite “ Gatorback”. Here is the shot of the tensioner with the AC Delco Professional 6K850. Notice the indicator marker shows the tensioner is a bit more relaxed because of the longer length.

7D67B107-6032-47CC-8C1A-EE89EE72C57C.jpeg
 

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I have a 2000 Vulcan and as you have seen from the picture it has a ACDelco 6K854 belt (recommended by Rockauto). With it, the tensioner is exactly at the middle indicator. So I'm a bit surprised that Rockauto recommends the ACDelco 6K850 for your 2005 Vulcan which then also turns out to be ever so slightly to short. I guess 0.4" to short.

Perhaps their catalogue is not as infallible as it seems.
 
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