Weird shutter while in reverse and park ‘07 1500 4x4

[Huggy16]

Hey everyone! I’ve been looking all over to see if anyone has had the same problem but cant seem to find anything. When I put it in reverse I get a weird shutter as well as in park. It doesn’t do it all the time though. The pickup runs great and shifts perfect, the oil looks a little dirty so I’m gonna flush it this weekend and replace the filter. Should it be anything to worry about and has anyone experienced this? The pickup only has 70,000 on it as well and the u joints are in good condition 

[Supreme Pizza]

 

[Huggy16]

8 hours ago, starman8tdc said:

 

Thanks for the reply man! Doesn’t really sound like what’s going on with mine, but now I’m kinda worried about changing my fluid. The fluid looked good a few weeks ago but now has a brownish tinge to it. And with only 70,000 miles on it I don’t think it would really hurt anything, or would it?