I need to replace the knuckle seals on the Dana 27 on my 67 CJ5. I've sourced the new seals and reviewed the procedure in the service manual. I'm replacing them because one of the seals is bad, there aren't any other problems I'm aware of on the axle. Because of this I was hoping to just swap the seals and not disassemble anything else. The FSM describes cutting the felt gasket on a diagonal at the top to get it around the axle. The thing I'm trying to sort out is what to do about the lubricant. I need to add some and have enough new lithium based lubricant on hand to completely fill both (https://torqueking.com/product/777/closed-knuckle-lubricant-for-closed-knuckle-4x4-front-axles/). The question is the removal of the old. From what I've read the factory fill was sodium based lubricant and I understand I can't mix that with lithium base. I have no idea of the service history or what's in there now. Is there a practical way to flush the knuckle without pulling the hubs?