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My reverse just all of sudden started grinding while getting stuck in a mud hole. It could be slammed into reverse but after a few times it just grinded. Is this a shift linkage problem or something internal?
 

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Any error codes?
 

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No, no codes. Just grinds when I try to put it in reverse. It eventually goes in if i slam it in to gear.
 

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Once the sub-transmission either drive or reverse grinds the adjustment should be checked , if it happens a few more times then it's to late to adjust it because the corners of the dogs will already be rounded..

The parts aren't that expensive because the gears are 2 piece and you can change just the dogs , but it takes a couple of hours labour ..

Here is a picture of the drive & reverse parts .. You can see the rounded edges on the dogs ..





 

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Just suggesting, but maybe you shouldnt put it in a mudhole?
 

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Man I wish I had all this good info that saber has lots of great info. Then I would have to go tap moose's computer and get all his info.
 

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Saber6 Is correct

I did one of these the other day. If your TRX680 is crunching into FWD or RWD or simply one of these, the dogs are worn. It doesn't take much as shown in the photos above. This is a very common problem as the trx680 differs from the other trx models because it uses a torque converter (which honda call a hydrostatic clutch) like a car transmission rather than the too well known and indestructible honda steel centrifugal clutches. Honda did this because the trx680 produces to much torque which destroys the normal steel clutches that the other lesser powered models use. This problem seems to occur every 2-3 years with these bikes.

Fix***

First drain oil. Flip the bike onto its front bullbars, (this way all the gears and shafts sit in place due to the gravity). Rip the entire rear end (rear axle and drive shaft) off to allow full access to the rear of the engine. Unbolt the pull starter and the bolts inside and disconnect the wiring and shifter cable. Lift the cover off and replace 1 or both of the dogs. Dogs cost Approx $180NZD for a pair as of Dec 2011 and are available through any honda atv dealer. Replace dogs. Seal case with permatex or similar (threebond is good) and ensure no sealant has got into any galleries or will get into galleries once cover is placed. Alternatively purchase new gaskets. Bolt everything back together. Replace oil and drive away.
 

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No, no codes. Just grinds when I try to put it in reverse. It eventually goes in if i slam it in to gear.
I have the same problem. Only it's never been in the mud. The picture of the gears are not visible in you post. Could you resend them? I can use reverse if I sit the machine off. Grab and hold the right hand break. Put into reverse then turn on the key and start the machine in gear. This bypass a safety
 

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There is a fix for this problem that involves parts from the Honda Big Red UTV that uses the same basic engine/transmission. I haven't done one personally but there's lots of info out there that describes what is involved. Supposed to make all the difference.
 
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