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What do staggered rear shocks mean?
#1
Is the staggered rear shocks an option?  Mine has one in front of rear end and 1 in the rear.  Is this the "drag pack" option or is it just how they all came?

Thanks!
Wade
1972 Mach 1 351 cj 4speed
"We confide in our strength, without boasting of it; we respect that of others, without fearing it."--Thomas Jefferson

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#2
scgamecock, staggered rear shocks were not a stand alone option. The competition suspension was standard on the Mach1 (regardless of engine size) and the staggered rear shocks were included with the 4bl 351 and 429 engines. The competition suspension was an option on all other Mustangs except the 250 6 cyl and was a mandatory option on any F60x15" equipped vehicle.
The staggered rear shocks were Ford engineers attempt to control rear axle wind up. With the sudden application of large amounts of torque (such as on 4sp cars) the differential was twisting and causing the leaf springs to twist and the  rear wheels to bounce up and down. From 68-70 Ford used staggered rear shocks on 4sp cars. From 71-73 Ford also included the staggered shocks on A/T equipped cars with 4bl engines.
The Drag Pack option was only available on the 429 cars and included many engine enhancements and a choice of 3.91 or 4.11 differential gears (3.91 or 4.30 on Torinos). AC was not available on Drag Pack cars.



[Image: wheel_hop_1.jpg]

Steve

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!
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#3
(09-29-2018, 11:27 AM)secluff Wrote: scgamecock, staggered rear shocks were not a stand alone option. The competition suspension was standard on the Mach1 (regardless of engine size) and the staggered rear shocks were included with the 4bl 351 and 429 engines. The competition suspension was an option on all other Mustangs except the 250 6 cyl and was a mandatory option on any F60x15" equipped vehicle.
The staggered rear shocks were Ford engineers attempt to control rear axle wind up. With the sudden application of large amounts of torque (such as on 4sp cars) the differential was twisting and causing the leaf springs to twist and the  rear wheels to bounce up and down. From 68-70 Ford used staggered rear shocks on 4sp cars. From 71-73 Ford also included the staggered shocks on A/T equipped cars with 4bl engines.
The Drag Pack option was only available on the 429 cars and included many engine enhancements and a choice of 3.91 or 4.11 differential gears (3.91 or 4.30 on Torinos). AC was not available on Drag Pack cars.



[Image: wheel_hop_1.jpg]


So since I have the staggered shocks my car came factory with the 351c 4bl and 15" rims??  Would it also indicate a posi rearend?  What gear ratio would it mst likely come with since it is a Q code 4 speed car?

Thanks!
Wade
1972 Mach 1 351 cj 4speed
"We confide in our strength, without boasting of it; we respect that of others, without fearing it."--Thomas Jefferson

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#4
look on drivers door for that info. or jack up rear and turn one tire and the other will turn in same direction... if it turns the other way it's open rear.
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#5
Could have come with many different gears. But if your car is an a/c car then the tallest gear you could get would be a 3.25 and could be posi or open.

run_horse Run Horse Run!
John 72 Q Code
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#6
(10-01-2018, 08:04 AM)jpaz Wrote: Could have come with many different gears. But if your car is an a/c car then the tallest gear you could get would be a 3.25 and could be posi or open.

3.25 was the only gear you could get with a 351CJ and A/C.


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#7
Mach I was just an appearance package, so comp suspension depended on what engine option. The only suspension thing Mach offered standard was wider E-70 tires over E-78
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#8
(10-01-2018, 08:30 AM)Hemikiller Wrote:
(10-01-2018, 08:04 AM)jpaz Wrote: Could have come with many different gears. But if your car is an a/c car then the tallest gear you could get would be a 3.25 and could be posi or open.

3.25 was the only gear you could get with a 351CJ and A/C.

After I broke three 3.25 rears in my Mach 1 Ford rep. told them to put a 3.5 in mine with air, lol. They had also put the small u joint 9" in my Q code which they also changed. This was done under warranty over 6 month period of time.


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#9
scgamecock, As I posted earlier the Competition Suspension is standard on the Mach1 regardless of engine size. The staggered rear  shocks were included with any 351 4bl or 429 powered car.
Since your car has factory AC the 3.25 gear was mandatory.  The 3.50 gear would be the standard gear with no AC and a 4sp. To see if your car was equipped with "Traction Lok" from the factory you can check your door tag under "Axle" and look for "9" (3.25 non locking) or "R" (3.25 locking). There is also a tag that was on the front of the differential that would show 3L25 if a locking or 3.25 non locking. Of course a lot of those got tossed along with all the other tags we now pay a fortune to get reproduced!!
And...you can always do the test as delawarebill  suggested and jack the rear of your car up and turn the wheel and watch to see what direction the other wheel turns.
If you don't already have one, a Marti report would be a nice piece of documentation to have for your car .Gives you a pretty good ideal how your car left the factory.  Since it's getting close to the end of the year, that would also be a great gift ideal for someone in your family who struggles with what to get that "Car Crazy" person in the house!!   Big Grin


[Image: Inkedrearendtag_ford.gif]

Steve

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!
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#10
(10-01-2018, 09:44 AM)red351 Wrote: Mach I was just an appearance package, so comp suspension depended on what engine option. The only suspension thing Mach offered standard was wider E-70 tires over E-78

ALL Mach 1's received the Competition Suspension package, regardless of which engine you purchased. 302-2V and 351-2V received higher rate springs and stiffer shocks, and the variable ratio box if P/S was ordered. When you ordered any of the 351-4V or 429s, you also received staggered rear shocks, rear sway bar and an upgraded front bar.

IIRC, the the standard spring rates were in the neighborhood off 250 lb/in frt & 78lb/in rear. CS cars were around 400 lb/in frt & 135 lb/in rear. That's a difference you can feel.


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