1986 Thunderbird Prop Valve July 22, 2018, 12:00:55 PM So I have swapped my rear axle to an 8.8 in the 1986 Thunderbird, and I am using the disc brakes that came on it. I gutted my prop valve and ended up stripping one of the brake lines that goes into the bottom of the prop valve. I'm having a hard to finding a new one to buy and was wondering if there is any way to replace the gutted prop valve with something else and just run an aftermarket adjustable prop valve? Any input would be great thanks. My car is an 86 Thunderbird TC.