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Split Mono-Leaf Springs

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Rebel Machine View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: Mar/05/2018 at 10:51pm
Got the plates modified and mocked up with the shock in place. Looks like we've made some room.

This is at ride height.




Bolt lines up much better. Slides in without a fight. I'll have to shallow up that spacer to maximize the space available.




Welded them up this eve, need to give them a coat of paint since I burnt off that nice powder coated finish.

-Steve-
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bcsideshow Quote  Post ReplyReply Direct Link To This Post Posted: Mar/06/2018 at 9:35am
I have 275/50-15 MT ET streets on my 70 AMX and they fit good with 4.5" backspace.   Rubs 1/4 slightly on big bumps but car is lowered about 2 inches the rear.  Factory leafs

1969 SCRambler "B" scheme
1970 AMX 390 Auto
1968 AMX 390 Auto
1969 AMX 390 4SPD Project
1969 AMX 390 Auto Project
1969 Javelin 390 project
1997 Cherokee 2" lift
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: Mar/07/2018 at 5:50pm
Finished the install. Looks like there's more room between the leaf and tire, might be room for a 275 tire after all.

-Steve-







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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rebel Machine Quote  Post ReplyReply Direct Link To This Post Posted: Mar/14/2018 at 7:00pm
Originally posted by bcsideshow bcsideshow wrote:

I have 275/50-15 MT ET streets on my 70 AMX and they fit good with 4.5" backspace.   Rubs 1/4 slightly on big bumps but car is lowered about 2 inches the rear.  Factory leafs




If I remember right the '70 rear is 1" narrower than the '69. That jars the numbers a bit.

-Steve-

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Post Options Post Options   Thanks (0) Thanks(0)   Quote bcsideshow Quote  Post ReplyReply Direct Link To This Post Posted: Mar/15/2018 at 4:30pm
Originally posted by Rebel Machine Rebel Machine wrote:

Originally posted by bcsideshow bcsideshow wrote:

I have 275/50-15 MT ET streets on my 70 AMX and they fit good with 4.5" backspace.   Rubs 1/4 slightly on big bumps but car is lowered about 2 inches the rear.  Factory leafs



If I remember right the '70 rear is 1" narrower than the '69. That jars the numbers a bit.

-Steve-


I always forget that!!!  
1969 SCRambler "B" scheme
1970 AMX 390 Auto
1968 AMX 390 Auto
1969 AMX 390 4SPD Project
1969 AMX 390 Auto Project
1969 Javelin 390 project
1997 Cherokee 2" lift
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Post Options Post Options   Thanks (0) Thanks(0)   Quote hemicop Quote  Post ReplyReply Direct Link To This Post Posted: Sep/08/2018 at 4:57pm
If it were me, I'd re-locate the exhaust & set the shocks up like many "serious" drag cars are---perfectly vertical. 
 The reason is simple---a vertical shock will have NO binding while travelling as there is no side-load due to an angled mount (like a street car. This may not seem critical to you but since your interest is in drag racing every little bit to minimize friction in the driveline & suspension helps. And it won't adversely effect the car's street manners. 
 you can look at any photos of drag cars from stockers to ProMods and if they have shocks, they're vertically mounted-there's a reason for it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Sep/09/2018 at 12:55pm
This is copy and pasted text from long ago I have.
So although pretty confident, unable to say totally accurate...
1970 Rim offset might be different than 1969....
1967-72 AMC Parts Manual does show different Part #'s for 68-9 than 70 AMX, Javelin Rearends

Memory tells me "idealy" 5 inch Backspace works "best"...
to maximize tire width, fit within fender, spring clearance,
but it has very limited availablility.. 

Hub to Hub, both front and rear, is 1.0 inch greater than
stock Track Width dimensions based on stock wheel offset.

1968-69 Dims from Technical Service Manual
59.38 inch = Front Hub to Hub = 58.38 Stock Front Track + 1.0 inch
58.00 inch = Rear  Hub to Hub = 57.00 Stock Rear  Track + 1.0 inch

1970 dims from AMA Data sheets
60.30 inch = Front Hub to Hub = I6 59.30 Stock Front Track + 1.0 inch
60.70 inch = Front Hub to Hub = V8 59.70 Stock Front Track + 1.0 inch
58.00 inch = Rear  Hub to Hub = 57.00 Stock Rear  Track + 1.0 inch

This below pretty much matches what I got when I trial fitted on a '69
15x8 w/ 5-/12 b.s. with 255/60/15 tires ( 1/8" to 0 sidewall to leaf spring)
Calculated distance between sidewalls of 255/60/15 on 5-1/2 backspace.
255mm = 10.04 รท 2 = 5.02 + 1.0 offset = 6.02 Hub to Inner Sidewall
12.04 = 2 * 6.02 Hub to inner sidewall on each side
45.96 = calculated between Sidewalls 58.00 hub to hub - 12.04
46.00 = Distance outside to outside of the Leaf Springs
 2.50 = Width of Leaf Springs
 1.25 = Distance from Sidewall to Leafspring 15x8 w/4.5 BS & 255/60/15


Edited by PHAT69AMX - Sep/09/2018 at 1:38pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote brownspirit Quote  Post ReplyReply Direct Link To This Post Posted: Sep/09/2018 at 4:28pm
I wish it was easier to mount the shock straight up, I was able to straighten them out a bit on my car, but not very much, and I have no tail pipes. Andy
69' BBB AMX 390/4speed
69' s/crambler
80' spirit 343/904 11.70@115 N/A
    driven to the track
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