I have a new in box (NIB) Detroit Locker for a Dana 44 with the low gears 3.73 or lower (numerically higher). The unit is for 30 spline axles. I am pretty sure the part number is EAT187SL16C, but I have to confirm this with the box. this unit has never been installed. The box is a bit beat up as I have had it on my shelf for too long. I am going to go with something less aggressive like a limited slip so it has to go. Shipping is included. The unit is heavy. I have a daily UPS pick up. Buy with confidence. Paypal preferred. Please PM me. I don't check this board all the time. I'd like $475 shipped. Item is located in Libertyville, Illinois. Questions? Thanks.