I have the standard 24:1 manual steering on a 1970 Duster. Is there a fast ratio setup that will fit my car? All the ones I have found were for the 16:1 steering box.

Thanks

Quit being an Azz....If you can't answer the question,don't bother with the smrtazz reply!

Can't just answer the question? Or if you don't want to answer, don't bother with a reply.

There are two different spline diameters (small) and (large). As long as you purchase the correct spline diameter pitman arm then it'll attach to any gear box ratio.
Contact www.firmfeel.com for assistance with the correct part for your application. They know best.

Thank you, sir.

First, I can only report on what I have read from the various websites that carry the items. They advertise that the pitman arm will change the steering ratio from 16:1 to 12:1. Since I have the 24:1 box, and none of those sites mentioned anything about that steering box, it led me to believe that they were only for the fast ratio box. None advertised about what the ratio would be if one was installed on the 24:1 box.

Second, I really don't take well to anyone, internet or otherwise, trying to intimidate me. If you can't give an informative answer or comment, don't bother me with your sarcasm. This site is for Mopar enthusiasts to ask and answer questions and pass along tech support and other assistance to those who request it. Nothing in my post required a sarcastic comment, reply, or pic. As I have stated before, if you don't have anything constructive to write, don't bother writing at all.

Exactly. If we are supposed to already know it all, what's the point of a Question and Answer Section?

Go feed your ego somewhere else if you don't have helpful responses.

Thanks LarryMopar360. I just don't get why this member has to act in such a manner. I thought that was the purpose of this site.

Never heard of anyone doing this, let us know what you think if you try it.
Most just put in the 20/1 or 16/1 box.
If you do this count your turns lock to lock, before and after.
I'm interested in how much it'll help, the stock 24/1 is too slow!

Yeah, that's why I was asking. I am assuming that the pitman/idler arm will actually fit my steering box, but I have not been able to locate any information that would advise how it functions or what difference it made in the steering. It's less expensive than replacing the steering box with a faster ratio one, but I wonder how much difference it will actually make.

Simple high school math. 16:1 is to 12:1 as 24:1 is to 18:1

https://www.hotchkis.net/product/66...s/?searchby=part&partnoval=fastratio

I see both sides of this one. It is a very uninformed question since anyone who understands Mopar steering boxes will know that the ABE manual boxes are all the same externally with just a different gear set internally. The Pittman arms all interchange for ABE boxes since they are all small sector so the fast ratio Pittman arm will interchange. But a person would need to know their way around a Mopar to know that the idler arm is a bit of a trick. As far as I know the only fast ratio idler arm being made is for the late model thru bolt. So the early cars can't use it. And of course, if you have an A body you would need to switch over to the late model center link to use the fast ratio setup. So the way the question was phrased made it seem dumb, but it is a complicated subject which only a few Mopar guys fully understand. A better question would've been "I have car XYZ, will the fast ratio arms fit my car" To answer that question a person needs to know small or large sector, type of idler arm mount, type of center link and what exhaust system is being used.

Having said that, it does appear that the vendors who sell these fast ratio arms don't do a very good job marketing them. Firm Fell has very little information on their website. Hotchkis has a decent description on their website but they forgot to explain what the ratio would be for a 24:1 or a 20:1 box. So yeah, the vendors could do a much better job of telling people about these parts.

The big issue with the fast ratio arms is that they move the center link back into the exhaust systems on most cars. The fast ratio is also an issue for manual steer cars. 16:1 is too fast of a ratio for most cars so putting fast ratio arms on a 16:1 box would be insane. Putting them on a 24:1 manual box might not be a horrible idea but if it turns it into 18:1 then that is faster than the 20:1 box which can be tough to steer. I tried a 16:1 box on my B body and it was too difficult to steer so I dropped back to the 20:1 box. Even it is tough to steer at low speeds so I'm planning to switch to a 14:1 PS box.

Good luck with your project.

AndyF, thanks much for joining in. I have a spare center link, but I am not sure what it came from. Can you advise what the difference is between the two? Or is there a part number I could look for on the center link?

C-body center link has a larger pitman tapper hole. This kept from installing the more common parts on the bigger c-bodys.

Years a go I installed fast ratio power steering on my 70 dart.
This is what I did:
Got a C-body power steering box with the big 1.100 spline from the junk yard.
Had firm feel rebuild with the stage three kit.
Bought moog 67-69 Idler( K7014 ) and Pitman (1965 66 67 68 69 70~ K-7034 ~ K-7072) arms, and the bigger tire rod sleeves( ES2004S) and joints( inner ES355RL) (outer ES352R) .
Junkyard c-body center link.
I needed to modified:
The drivers side metal frame splash pan.
The idler to fit into the mount on the K frame.
Shorten the tire rod sleeves.
I have modified a B_body center link by opening up the pitman arm tapered hole. I guess the same could be done to an A-body.
Exhaust pipe needs to be moved back.
Pictures saved from other post.
This is a link I posted years ago on another mopar site.
https://www.forabodiesonly.com/mopar/threads/fast-ratio-steering-box.108037/

I like how the steering feels in my 70 dart. Like a modern car. No slop.
Planing on installing this set up in my 65 coronet, hopefully this summer.

Also have been collecting parts for manual fast ratio steering to be installed in my 66 valaint.

You need the late style center link that goes underneath the Pittman and idler arm. The early style that you have on a '70 car sits on top. The engineers flipped the design over in 1973. Shouldn't be too hard to find used, not sure if anyone makes a reproduction or not.

Good topic 70Duster340. I'm "following" this one, so I can find it later when I need it.

If you go with the faster (longer) pitman....definately ALSO change to the longer (C body) idler. Some say it doesn’t matter..that’s not my experience at all. I put a fast arm on my 70 Cuda and it really did screw up the Ackermann angles...you could feel it as you drove through a turn, especially a decreasing radius turn like a freeway exit,

The idler is cheap, but take that into account if you have clearance issues.

Ditto... the C-body longer idler arm is the correct matching arm for the "Fast ratio" longer pitman arm. MaMopar screwed up on the T/A and AAR cars (also carried over to some 71 model e-bodies) by not installing the proper longer idler arm with the optional "Fast ratio ps T/A box". Anytime a "fast ratio idler arm" is mentioned... anywhere... its truly just a C-Body idler arm. The FACT is... No one "developed" a fast ratio idler arm.. it was simply an oversight by MaMopar to not install it on those optioned vehicles.