5th Coil Shock

When moving the shock from one hole to the next on the lift bar, are you suppose to move the shock with it on the frame.

I don't quite understand your question but when you move it on the 5th arm you move it a equal increment on the chassis in the same direction

Thanks for the answer.

Np also worth noting is generally when moving back it is recommended to increase spring rate

I was told to add 25 pounds more spring each hole you moved it back. That was a long time ago, is that theory still true?

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Originally Posted by Roudy73

I was told to add 25 pounds more spring each hole you moved it back. That was a long time ago, is that theory still true?

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It depends on the spacing

So if it was a 300 pound spring an you moved it back 2inch would you put in a 325?

Quote:

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Originally Posted by Roudy73

So if it was a 300 pound spring an you moved it back 2inch would you put in a 325?

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If I did my math right, assuming 600 ft pounds at rear end with a 5.00 gear for 3000 ft pounds at the axle then the poundage at the arm is this at this length (I used numbers to make it easy)

32" = 1125.28#
34" = 1058.84#
36" = 1000.00#
38" = 947.39#

Obviously this is assuming enough traction to be full throttle or least to the torque rating I listed at that RPM and time. Increase/decrease the torque, gear, or traction and those numbers can go up or down a fair amount.

Are guys still starting around the 300 range with a crate car?