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Back too high...
#31
Geoff, the competition suspension was standard on all Mach 1's regardless of engine size. It was an available option on all other Mustangs except the 250 6cyl and was a mandatory option on the 71-72 F60x15" equipped cars (F60 tires also not available on the 250)
There has always been some confusion on both the suspension and the shocks.  The staggered shocks were specified by the engineers to be only on the 4bl equipped 351 and 429 powered Mustangs.

Steve

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!
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#32
Why all of the conjecture? What is the first five of the VIN?



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#33
Hi Guys, I'm back  Big Grin

So, I changed my shock absorbers by KYB. The news ones were 3cm shorter so I was happy thinking that the back of the car was going to go down but not realy... 
However, I had a hard time depositing the old ones. I also had to dismount the fixing of the springs to take them out.
I see the shackle too but that's the stock dimension (90mm spacing)
So, there I don't know what to do anymore...
Change the shackles by shorter ones or put a rear end lowering kit...

[Image: amortos_2.jpg]


[Image: fixation_ar2.jpg]

[Image: SIGNATURE_3_paris.jpg]

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#34
The rear shackles look stock, so that's not really an option.

Lowering blocks are a possibility and will solve your problem, but not really the best method. Changing the springs to a stock ride height spring is the proper way to resolve the issue.


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#35
(09-13-2018, 08:03 PM)secluff Wrote: Geoff, the competition suspension was standard on all Mach 1's regardless of engine size. It was an available option on all other Mustangs except the 250 6cyl and was a mandatory option on the 71-72 F60x15" equipped cars (F60 tires also not available on the 250)
There has always been some confusion on both the suspension and the shocks.  The staggered shocks were specified by the engineers to be only on the 4bl equipped 351 and 429 powered Mustangs.

 Thanks Steve, Honestly I can't remember what my H code had, but I'm glad of your continuing expert information. I think most, me included, think that Competition Suspension INCLUDES staggered shocks, but I guess not Eh!
Geoff.
  Reply
#36
(09-24-2018, 12:23 PM)Hemikiller Wrote: The rear shackles look stock, so that's not really an option.

Lowering blocks are a possibility and will solve your problem, but not really the best method. Changing the springs to a stock ride height spring is the proper way to resolve the issue.

 Lowering Blocks; as I have commented on before and in the current post on Wheel Hop, they were only intended as a temporary solution while the new spring settle in. They are not the best method for sure. I just spent money on those Gtab-A-Trak springs, but now wish I'd just bought new Eaton's and be done with it. However, I don't think Eaton have the extra 1/2 leaf to help stop the hop.
Geoff.
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#37
Geoff,
The staggered shocks actually first appeared on the 68 1/2 428 4sp Mustangs. That configuration continued on through 1970 on the 4sp equipped cars. A change on the Competition Suspension for the 71-73's included staggered shocks on the 3514bl and 429 CJ regardless of transmission. I knew the M/T  cars had some terrible wheel hop. I had a 67 Mustang 289 4bl with a 4sp that had wheel hop so bad, I actually started breaking rear suspension pieces and drive line parts. A 9" differential swap and some Ansen Ground Grabber traction bars fixed that. I became aware of wheel hop with an automatic equipped car when a friend that owned a GTO wheel hopped so badly it twisted the axle tubes and broke the  welds loose from the center housing. We found the 9" for my 67 while going to pick up a replacement differential for his GTO which had gone past the point of being repaired any further.

Steve

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!
  Reply
#38
(09-24-2018, 11:13 AM)Jean-Pierre Wrote: Hi Guys, I'm back  Big Grin

So, I changed my shock absorbers by KYB. The news ones were 3cm shorter so I was happy thinking that the back of the car was going to go down but not realy... 
However, I had a hard time depositing the old ones. I also had to dismount the fixing of the springs to take them out.
I see the shackle too but that's the stock dimension (90mm spacing)
So, there I don't know what to do anymore...
Change the shackles by shorter ones or put a rear end lowering kit...

[Image: amortos_2.jpg]


[Image: fixation_ar2.jpg]
I would check the measurements on the shackles. I know they make extended ones. Your shackles look to to be only lightly rusted.
Just a thought......
  Reply
#39
(09-24-2018, 04:19 PM)secluff Wrote: Geoff,
The staggered shocks actually first appeared on the 68 1/2 428 4sp Mustangs. That configuration continued on through 1970 on the 4sp equipped cars. A change on the Competition Suspension for the 71-73's included staggered shocks on the 3514bl and 429 CJ regardless of transmission. I knew the M/T  cars had some terrible wheel hop. I had a 67 Mustang 289 4bl with a 4sp that had wheel hop so bad, I actually started breaking rear suspension pieces and drive line parts. A 9" differential swap and some Ansen Ground Grabber traction bars fixed that. I became aware of wheel hop with an automatic equipped car when a friend that owned a GTO wheel hopped so badly it twisted the axle tubes and broke the  welds loose from the center housing. We found the 9" for my 67 while going to pick up a replacement differential for his GTO which had gone past the point of being repaired any further.

 Very interesting info Steve. Thanks for sharing your knowledge on all things Mustang.
Again I learned something new today!
Geoff.
  Reply
#40
(09-24-2018, 04:19 PM)secluff Wrote: Geoff,
The staggered shocks actually first appeared on the 68 1/2 428 4sp Mustangs. That configuration continued on through 1970 on the 4sp equipped cars. A change on the Competition Suspension for the 71-73's included staggered shocks on the 3514bl and 429 CJ regardless of transmission. I knew the M/T  cars had some terrible wheel hop. I had a 67 Mustang 289 4bl with a 4sp that had wheel hop so bad, I actually started breaking rear suspension pieces and drive line parts. A 9" differential swap and some Ansen Ground Grabber traction bars fixed that. I became aware of wheel hop with an automatic equipped car when a friend that owned a GTO wheel hopped so badly it twisted the axle tubes and broke the  welds loose from the center housing. We found the 9" for my 67 while going to pick up a replacement differential for his GTO which had gone past the point of being repaired any further.

What year GTO would that have been?  I'm thinking one of the earlier years.  I had a '68 GTO back when it was only a 12 year old car, and it amazed my friends how well-planted the rear was.  Even on violent dump the clutch smokey burnouts that thing would just sit back, smoke the tires, and launch without any drama.  Stock BOP 3.55 Posi rear, never had it apart.  I did add a rear sway bar from a '70 GTO in the final year I owned the car, but that wasn't to address wheel hop, and there was none to begin with.  Walked right into the neighborhood Pontiac parts department in '82 and bought that rear sway bar right off the shelf.  heh  I do recall earlier model year Mustangs having a wheel hop problem.  I think you can even see this in the Bullitt chase scene.
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