“Stock” 24:1 ratio should be about 4 1/2 turns lock to lock.

20:1 ratio works out to AROUND 3 1/2 turns lock to lock, by my math. Is the range/angle of the actual pitman arm reduced?

Range SEEMS to be reduced. It also has a Firm Feel fast ratio pitman arm. Turning radius is pretty bad and bump stops are nowhere near the lower a arm, it's the box limiting the full turn abilities we think
MoPar Performance P4007612 kit in a factory box housing. Steering is fine, but won't turn sharp!?!

What was the intention of running a 20:1 box and fast ratio longer pitman arms. As apposed to 16:1 box.

Did you change to a longer idler arm too to match the longer Pitman Arm?

Need to accurately measure the output shaft lock to lock of your 20:1 box compared to a 24:1 box. Like paint mark a spine tooth, scratch awl a corresponding mark on the housing. The calipers involved. get measurement difference. Or maybe use an engine degree wheel. etc.

If they are the same, I would look into the clocking of the pitman arm to the output shaft. I believe the repro Quick Ratio Pitman's are not clocked. So it's up to the user to figure out.

I wanted a 16:1 ratio - the car is light, engine is setback, it's got narrow tires up front.
Here's the weird part lol
It's a C body front end. It has a Firm Feel fast ratio pitman arm, the idler arm is C body and almost identical length.
We are measuring lock to lock this weekend as accurately as possible. The pitman arm is clocked dead center of the output shaft, it's restricted turning equally both ways.. Not sure if the 20:1 kit was faulty, our install was faulty or what. Drives fine just doesn't seem to turn far enough in either direction.

Oh it's a 1969/1970 C body front end, spindles, ball joints, frame, you name it. Has a manual box with a Firm Feel fast ratio pitman arm and Wilwoods but it's C body. (NOT A/B/E)

It's a B body manual steering box, small shaft. The Fast Ratio pitman arm was used not just for steering ratio but for the length, it's the same as the C body pitman arm. The center link is flat/parallel side to side. Not sure what you mean by different geometry in the pitman arms B to C body, but the shape of the pitman arm does not seem to be the problem. C body pitman arm won't help, it's a B body small spline box.

Car has a 117" wheelbase, not sure that's relevant to the problem either.

Turing stops do not come into contact, bump stops on lower control arms not a factor. Seems to us that the steering box doesn't turn as far BOTH WAYS as a regular B body manual steering box.
Car drives perfect, just the turning circle not tight enough as we would like.
We will figure it out, I'll post what it is/was.

I having to add here except my amazement a C body ever had manual steering.

I have nothing to add here except my amazement a C body ever had manual steering.

This thread reminds me of a customer I had back when I worked at a parts store.

Came in wanting plugs for his 76 Camaro with a 350. No problem, look them up, tell him his choices, he picks the brand he likes I get them,

We get to BS'ing about cars and he's telling me about the Camaro. Mentions it has "Corvette double hump" heads. Yeah, everybody back then had double hump heads, lol. Heck, I had a set on my 383 Hemi, lol.

Anyway, a dim light goes off in my head. Now I am not a Gm guy but I was pretty sure Chevy changed the plug style between the two so I tell him "Wait a minute" and look up the plugs by the application the heads came from. Sure enough, one was gasket type the other taper, so I get him the plugs he could actually use and not blame me for giving him the wrong ones.

Anyway, the reason this thread reminds of that is when you are playing mix and match with parts it is important you tell us that, not a generic "C body front end". Because, obviously it's not all C body steering and the issue is that you are using the wrong box. How to fix it? Use the C body box. Will your MP parts fit that box? I do not know.

All of the famous 69 California Highway Patrol spec 440 HP Polara's were manual steering.

Also note that parts list I posted shows that 71-93 B-series van's can have manual steering. And it's the same as the C-body box.

Still amazed, but thanks.
What ratio were those C Body's