Johnny Manziel -- Best Piece of Johnny Football Memorabilia Ever ... His Autographed Truck!

Johnny Manziel just got his "dream car," which means now you can buy his old one … which is particularly awesome because HE SIGNED THE DASHBOARD!!!

Manziel traded in his 2014 Nissan Titan SL when he picked up a sick new 2015 Nissan GT-R. When Manziel did the deal at Airport Nissan of Cleveland, the dealership's owner, Bernie Moreno had him autograph the dash before sealing the deal.

The car has been on the floor since Monday and is already getting some interest … but no rock solid offers yet. The dealership is asking $43,720 which does include a bit of a "Johnny Football tax." The dealership says they plan to post it on eBay ... so Texas fans can get in on the action.

As for Johnny's new ride, it's a special Black Edition with a black interior. The GT-R is the world's second fastest production car and runs about $110,000.

Not bad for a backup QB.