- Joined
- Sep 12, 2015
- Messages
- 6,405
- Reaction score
- 1,456
- Location
- SW Ontario
- My Car
- 1971 Mustang Mach 1, M code, 4 speed.
On the Red Head box, I can't answer that because I haven't got one, but I would think it's a fixed ratio. Your SPA-AE box is NOT a 22:1 as that would be a manual box not a PS box. SPA-AE is a 17.5:1 ratio. >1/2/73. I think you just looked at the wrong line. The manual box tag for the 73 would be SMA-T @ 24:1 ratio. (according to my Marti Tag book.)OK so I read the tag of my steering box - SPA-AE, which I see is a constant ratio @ 22:1. I plan on getting the Red Head quick ratio power steering box @ 12.7:1 . My questions are there any other changes I will need to make to install in my long nosed Mustang? Is the Red Head box a constant or variable ratio box?