What's the current state of idler arms for our cars?

Help Support 7173Mustangs.com:

Joined
Sep 12, 2015
Messages
5,892
Reaction score
961
Location
SW Ontario
My Car
1971 Mustang Mach 1, M code, 4 speed.
I bought my idler arm from Scott Drake Holley it looks lie the one I removed from the car View attachment 60804 View attachment 60805

I have not installed it yet but it looks like it will fit. The mount holes line up and the geometry looks the same overall.
Just looking at your pic, which could be an illusion, check the center dimensions through the mount side pivot to the centerline of the link side, dimension"X". The S/D one looks to be shorter. If it is, send it back. Reference my pfd above.
If the dimensions are the same, it should be okay.
 

Sheriff41

Well-known member
Joined
Aug 5, 2019
Messages
409
Reaction score
205
Location
Texas
My Car
72 Mustang Q-code
Just looking at your pic, which could be an illusion, check the center dimensions through the mount side pivot to the centerline of the link side, dimension"X". The S/D one looks to be shorter. If it is, send it back. Reference my pfd above.
If the dimensions are the same, it should be okay.
I saw that, also, but figured it was probably an illusion caused by the photo and the position of the upright portion of the idler arm.
 

tpj71mach

Well-known member
Joined
Jan 20, 2022
Messages
268
Reaction score
191
Location
Chicago IL..
My Car
1971 Mustang Mach 1 351c FMX trans and 9 inch rear end
FYI I measured the dimension "x" and they are the same from the S/D idler to the one that came off the car. Hoping the one on the car when I bought it is correct I should be okay. Everything seems to measure out okay, I will find out today, or soon, as I am starting to reinstall the front suspension and steering today. Fingers crossed 🤞
 
Joined
Sep 12, 2015
Messages
5,892
Reaction score
961
Location
SW Ontario
My Car
1971 Mustang Mach 1, M code, 4 speed.
FYI I measured the dimension "x" and they are the same from the S/D idler to the one that came off the car. Hoping the one on the car when I bought it is correct I should be okay. Everything seems to measure out okay, I will find out today, or soon, as I am starting to reinstall the front suspension and steering today. Fingers crossed 🤞
All should be good then. Best to be sure before you spend time putting it on.
Personally, I am not a huge fan of Scott Drake stuff and avoid wherever possible.
Let us know how it works out.
 

tpj71mach

Well-known member
Joined
Jan 20, 2022
Messages
268
Reaction score
191
Location
Chicago IL..
My Car
1971 Mustang Mach 1 351c FMX trans and 9 inch rear end
I installed the Scott Drake idler arm yesterday and the angle is wrong. I mounted the center link to the idler and the other end of the link is approximately 2 1/2" higher than the pitman arm. So I'm calling it, even though it is listed for 71-73 w/PS, Scott Drake idler arm does not fit our cars. Back on the hunt for an idler arm that will fit, or just reinstall the one that came off, overall it looked in good condition, the rubber looked good. I was just hesitant because it was on there when I bought the car and didn't know how old it was. But a little detailing and it will be fine for now at least. I can get the front suspension and steering together. Once the car is back on four wheels I can get back to body work.
 

tpj71mach

Well-known member
Joined
Jan 20, 2022
Messages
268
Reaction score
191
Location
Chicago IL..
My Car
1971 Mustang Mach 1 351c FMX trans and 9 inch rear end
I'm worried about the front springs now. They are the only other Scott Drake part I have ordered so far for the front suspension. Mach 1 217a.jpg


Here is a picture of the SD idler arm installed but it binds terribly because of the tension of the angle being off.
 
Joined
Sep 12, 2015
Messages
5,892
Reaction score
961
Location
SW Ontario
My Car
1971 Mustang Mach 1, M code, 4 speed.
I'm worried about the front springs now. They are the only other Scott Drake part I have ordered so far for the front suspension. View attachment 60968


Here is a picture of the SD idler arm installed but it binds terribly because of the tension of the angle being off.
I know the sketch I posted is a bit light, but check the dimensions I show, marked X and Y. If those are off, then it is likely nfg. As for front springs, I've said it many many times and from my own experience, ONLY use Eaton Detroit Springs springs if you want it right for a stock, or 1" lowered suspension.
You could buy new bushings for the original if you can get them pressed in. That might be an option.
 

tpj71mach

Well-known member
Joined
Jan 20, 2022
Messages
268
Reaction score
191
Location
Chicago IL..
My Car
1971 Mustang Mach 1 351c FMX trans and 9 inch rear end
So... After all of the playing around with the S/D idler arm, I decided to rebuild and repaint my original. It's installed and the geometry is correct and no more binding, on to the next challenge. I appreciate all of the information and guidance on this. I don't think I am going to buy any more Scott Drake stuff unless absolutely necessary.

Mach 1 223.jpg Mach 1 224.jpg Mach 1 221.jpg Mach 1 222.jpg
 

tpj71mach

Well-known member
Joined
Jan 20, 2022
Messages
268
Reaction score
191
Location
Chicago IL..
My Car
1971 Mustang Mach 1 351c FMX trans and 9 inch rear end
It probably is, that's the luck I'm having with these steering components. I used the one that was on the car because I couldn't find a listing for one and I figured there is no rubber to wear or dry rot, so I just cleaned and painted it. I will start researching a new one of those, in the future, need to move away from steering for a while.
 
Joined
Jan 17, 2015
Messages
1,527
Reaction score
219
Location
California
My Car
71' Grande project.
I wanted to add a little more info since my earlier post was a link to another thread with no explanation of it. First photo top to bottom shows a used NLA Moog arm, mystery repop arm, then a Rare Parts RP20250 on the bottom.

Next photo shows an original idler (or what I think is original).

I ended up running the Rare Parts RP20250 on my car, I can't say I am excited about the "S" bend shape. The geometry between the mounting points, pivot etc. are all correct. It bolted right up and works well.


IMG_1915.jpg


IMG_1961.jpg
 
Top