dana 80 true track never installed. ordered it in a year ago for a custumer and they never came back in to get it i payed 700 for it new. its been sitting in my shop in its crate collecting dust and it needs to go. will fit all gm dana-80s. spline count is 37. part number EAT916A427. The Detroit True Trac Limited Slip is an all gear driven clutchless differential. The True Trac will automatically provide smooth transfer of power from the slipping wheel to the non slipping wheel to help you out of a jam. With no clutches to wear out, you will have a dependable long lasting Limited Slip differential. asking 500
