Cobra Jet spring rate?

I searched on here and online and could not find the CJ spring rate; if anyone has the f/r spring rated please let me know, thanks!

I am talking about the normal ones, not the lowering ones.

Ford part number: M-5300-Q

Apparently these are just V6 springs.

http://www.s197forum.com/forum/showthread.php?t=17063&highlight=cobra+jet+springs&page=4

I also found this over on corral....

On the standard CJ springs M-5300-Q, the fronts have the same part number as a premium GT and the rears have the same part number as the Bullitt springs. There was a lot of discussion a while back about if they were actually V6 springs and whether or not they had the same spring rates but were shorter. I put them on my car and it lower the rear 1/4" and the front dropped less than an 1/8". How much it lowers the car is dependent on which springs you had from the factory. There are AC, BC, CC & DC springs, the drop depends on which ones you started with. Some cars dropped an inch and some did not drop at all. Here is a link to a detailed discussion about it WWW.S197FORUM.COM <--Must be a member to view. People have tested these springs and they do work well, Cobra Jets run them too. I could cut 1.6x 60' with both the M-5300-Q & the M-5300-R springs. The only difference was the ride height on my old car.

I am curious what the drop is on the new M-5300-RA* springs, which are new for 2013.

I have heard and read the same thing that the CJ's were the same as the V6 but then I read they are not; I hope someone can list the actual spring rate.

I looked at them on AM's site and they said they are made by Eibach for Ford....?

M-5300-Q

Rear 24.9 N/mm
Front 23.9 N/mm

kdanner said:

M-5300-Q

Rear 24.9 N/mm
Front 23.9 N/mm

Click to expand...

Soo..converted to this format?


Front Sway Rear Sway Front Springs Rear Springs

Base GT 34.6 mm 24mm 123 lbs. 156 lbs.
Brembo 34.6 mm 24mm 131 lbs. 167 lbs.
Boss 302 34.6 mm 25mm 148 lbs. 186 lbs.
Laguna Seca 34.6 mm 26mm 137 lbs. 191 lbs.

F: 136
R: 142

Keep in mind, with a car that is front end heavy....springs with these types of rates really need a VERY good double-adjustable rear and atleast, at the minimum, a high quality single up front.....but with a 136 up front, I'd go DA.

BMR Tech said:

F: 136
R: 142

Keep in mind, with a car that is front end heavy....springs with these types of rates really need a VERY good double-adjustable rear and atleast, at the minimum, a high quality single up front.....but with a 136 up front, I'd go DA.

Click to expand...

Whats wrong with the lakewood 90/10 and 50/50 set up with these. I thought that was what GT-350 runs

any info on the 2013 cj springs, RA???

Info on the 2013 lowering springs please