Hey I just did a tranny swap on my car a week ago.. Anyone know why when i start the car up my speedometer willl jump to labout 40 miles per hour??? This is just now happening it was fine right after tranny install...

 

is it a stock replacement? meaning is it for ex. a gsr engine + gsr tranny?

 

ya its doing it once in a while....its a gsr tranny on gsr motor..