Accidentally hit the gear shift into the first gear position driving 70 MPH?

So, I accidentally hit the gear shift into the 1st gear position going 70 MPPH quickly put it back, didn't notice much until I stopped it would go in reverse or first gears. I put it drive and it goes but feels like it's actually in second. My question is, will I have to replace my transmission or what? It's still drives and the 4x4 still engages and seems to work it also drives great with cruise control, but cc doesn't always work. please help.