Guys I'm looking at purchasing a Dana 61 rear axle with a 3.07 ratio to narrow and put under my 1966 Ford F250 camper special. The ad says it has Trac lock which I'm told is pretty rare option. The BOM is 603946-2. I have tried to decided the code but cannot. Could someone help me with this code to make sure it is a 3.07 ratio with Trac lock? Just to fill y'all in the truck has a 460 engine with a c6 transmission and a US Gear overdrive and a Hughes fuel miser torque converter. I'm up to 13 MPG and trying to get to 15 MPG. The high gears match the low totque power band of the 460 engine great. The higher the gears the better it runs. Any help / info on the dana 61 would be appreciated.

 

Ford: E0TA-VD ~ Dana: 603946-2 = Dana 61.2 Rear Axle / 3.07-1 / Limited Slip.

Applications: 1980/89 F250.

 

Thanks number dummy!