Idler Arms 3917581A vs 3917581B - The Supercar Registry

09-17-2020, 02:49 PM

NorCam

Senior Member

Join Date: Feb 2015

Location: Alberta, Canada

Posts: 4,239

Thanks: 2,758

Thanked 3,603 Times in 1,284 Posts

Here are a couple picture of the two idler arms. The beefier one with the heavier forging is 3917581A and the smaller diameter forging is the 3917581B. Both measure out the same length and same height so it appears it's a difference in the beam thickness and perhaps the strength of one over the other?

One is for power steering and one is for manual steering?

__________________
I like solid lifter cars, big cams and cars w/ 3 pedals in them.

« Previous Thread | Next Thread »

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules

Forum Jump

All times are GMT. The time now is 07:55 PM.

Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars.