G56 Transmission Issue

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Hi I’m new to this page, I barely bought a 3rd Gen 3500 with the G56 transmission. I was stupid and didn’t think of taking the truck on the freeway before I bought it, but I come to find out that in 6th gear my speed tops off at 70 mph at about 3,000 rpms. Now I don’t know if this is a common issue or something that could be easily fixed but I’m young and don’t have a lot of money to throw into this truck. It’s all stock except for a muffler delete, it’s got 151,000 miles on it so I’m unaware of the issues that could come with these transmissions.
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