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Split Mono-Leaf Springs |
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5122 |
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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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bcsideshow
Supporter of TheAMCForum Joined: May/19/2010 Location: Kenosha Status: Offline Points: 1228 |
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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
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1969 SCRambler "B"
1970 AMX 390 Auto 1968 AMX 390 Auto 1970 Rebel Machine Project 1969 AMX 390 4SPD Project 1969 AMX 390 Auto Project 1969 Javelin 390 project 1997 Cherokee lifted 1998 TJ Lifted |
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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5122 |
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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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Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5122 |
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If I remember right the '70 rear is 1" narrower than the '69. That jars the numbers a bit. -Steve- |
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bcsideshow
Supporter of TheAMCForum Joined: May/19/2010 Location: Kenosha Status: Offline Points: 1228 |
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I always forget that!!!
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1969 SCRambler "B"
1970 AMX 390 Auto 1968 AMX 390 Auto 1970 Rebel Machine Project 1969 AMX 390 4SPD Project 1969 AMX 390 Auto Project 1969 Javelin 390 project 1997 Cherokee lifted 1998 TJ Lifted |
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hemicop
AMC Fan Joined: Sep/05/2018 Location: Phoenix, AZ Status: Offline Points: 2 |
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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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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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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 ÷ 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 12:38pm |
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brownspirit
AMC Addicted Joined: Mar/07/2009 Location: Georgetown, MA Status: Offline Points: 1020 |
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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
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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