The Ford Barn

oj · 10-09-2014, 05:27 PM

I keep seeing Model A front springs from 29" to 31.5", I thought the Model A axle where all the same width from perch to perch pin. Are there different shackle lenghts? Where would you use the 29"?

Rowdy · 10-09-2014, 05:35 PM

Think the difference you are seeing is the amount of sag they have. Rod

Fordors · 10-09-2014, 06:33 PM

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Some aftermarket dropped axles are narrower, made for those that build real low hot rods with fenders. Some narrower axles have perch holes with a closer spacing. Using a front spring with too long a main leaf, or even a worn out original spring, will cause the shackles to go toward the vertical and potentially the spring might strike the axle.

10-09-2014, 05:27 PM	#1
oj Senior Member Join Date: May 2010 Posts: 293	Why different spring lengths? I keep seeing Model A front springs from 29" to 31.5", I thought the Model A axle where all the same width from perch to perch pin. Are there different shackle lenghts? Where would you use the 29"?

10-09-2014, 05:35 PM	#2
Rowdy BANNED Join Date: May 2010 Location: Gothenburg Nebraska Just off I-80 Posts: 4,893	Re: Why different spring lengths? Think the difference you are seeing is the amount of sag they have. Rod __________________ Do the RIGHT thing - Support the H.A.M.B. Alliance!!!!

10-09-2014, 06:33 PM	#3
Fordors Senior Member Join Date: May 2010 Location: Orland Park,IL Posts: 1,408	Re: Why different spring lengths? Sponsored Links (Register now to hide all advertisements) Some aftermarket dropped axles are narrower, made for those that build real low hot rods with fenders. Some narrower axles have perch holes with a closer spacing. Using a front spring with too long a main leaf, or even a worn out original spring, will cause the shackles to go toward the vertical and potentially the spring might strike the axle. __________________ My school colors are black and blue, I attended the School of Hard Knocks where I received a Masters Degree in Chronic Mopery.