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Old 03-06-2013, 06:31 PM
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rear suspension travel

On a solid rear axle vehicle, what is the minimum amount of suspension travel recomended for street use? Thanks.

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Old 03-06-2013, 06:58 PM
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Enough so nothing hits.. But really, it will depend on what you have. What vehicle? What suspension? and so on. Give us more information on the project.
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Old 03-06-2013, 07:16 PM
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I typically use a 2x4 on it's side to replicate ride height when fabricating... so let's start the conversation at 3-1/2 inches.
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Old 03-07-2013, 03:24 AM
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Its going to sound rediculous, but I'm building a period correct "street freak" out of a 3rd gen Nova. The tires on these cars typically hung out of the wheelwells to varying degrees. Some quarter panels hovered a mere inch over the tires which seems unsafe. I wanted to get a bit more travel than that and install extended bumpstops to eliminate any tire contact possibilities.
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Old 03-07-2013, 05:07 PM
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Doesn't sound ridiculous at all, well, at least to me. I grew up in that era and had a '70 Nova. I put L60-15's on it when I was 16 and just learning about cars. I used air shocks, shock extenders and spring shackles (yikes). It looked bad *** (for that era) and had the look you are talking about. It rode like crap so I took the L-60's back and swapped for G-60's just so the tires didn't stick out.

That's why, back in the day, folks were using N50's, less overall tire diameter due to the 50's series versus the 60's.

Of course the right way, if there is such a thing, is to get re-arched leaf springs to lift the rear.

So what you runnning for the rear sset-up, and what rear tires are you using?
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Old 03-08-2013, 04:22 AM
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Thanks. Currently, I have heavy duty rear leaf springs with a bit more arch than stock, multi-hole lift shackles, air shocks and shock extenders. The air shocks aren't installed yet as I don't need them for my current 225/70/15 tires. I really want to run 275/60/15s. My wheels are period correct American made vintage slots, 15 x 7.5 with somewhere around 3.5-3.75 backspace. The problem with vintage wheels is less-than-optimal backspacing. From what I remember, almost everybody ran Cragar SS, Slots, or the occasional Keystone. I could step back to 235/70/15s which give me the desired height but might seem too skinny for "the look". The main thing is, I don't want to trash my tires or more importantly, my quarter panels.
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Old 03-08-2013, 05:16 AM
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Wow.....the old N50 days....i had them on a 69 Camaro, no tubs, and they stuck out pretty good too....had a warmed over big block in that car and used to try to burn em off the car, lmao....the air shocks awta get you there, you need extenders too? Shudnt need them....if you got the right length shocks....
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Old 03-09-2013, 12:42 PM
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I try to allow at least 3" of bump travel on live axle rear suspensions.

To do what you are suggesting more safely than with shock extenders and long shackles, I would get some leaf springs made up with the arch to get you the height you require without being too stiff. Then I might consider a very progressive bump stop with possibly an adjustable mount so you can taylor it to keep the quarter panel off the tire. Go with taller shocks instead of extenders, or lower the upper shock mount and/or raise the lower shock mount. Try looking through off-road magazines and part houses for long shocks and high arch springs. Just be careful not to get units that are to stiff.

Interesting project, good luck.

Andy
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