recently acquired 89 raider. when dropped into gear, the rear end kind of squats down the bounces back up. replaced the shocks, but still pretty much the same. weak springs or a characteristic of the coil spring short wheel base?

Dave

I have notice the same on my wifeÆs uncle LWB, but I have also notice it is very noticeable if the engine is still cold and the RPM's are still a little above 1k, have you notice it under low or high RPM's?. I think is characteristics of the coil springs setup but don't quote me on that some of the more Guru guys might have a different view.

Stuff like that are characteristics of the link suspension. Different things are designed into the suspension with the angles of the components, like anti squat and anti dive, what your seeing is the torque of the engine acting on the rear suspension.

I am sure some one more knowledgeable on the subject can elaborate a little further for you. <img src="/forums/images/graemlins/kewl.gif" alt="" />

No forward accel, I assume, to cause a weight transfer.

The axle is twisted in reaction to the start of forward rotation of the wheel, like a drill twisting in your hand as you start it up. Nose of the diff goes up in D, down in R. The trailing arms pull the chassis down against the springs as they try to twist downward (in D), pulling the rear end down against the spring pressure. The truck nose also want to rise (like a wheelie), which means the rear end squats. The rear end will rise a little as you put in in R, for the same but opposite reasons. I think leaf spring axles are less prone to this, but still do it some.

Yeah, some say I've got adjustable suspension in the rear of my LWB <img src="/forums/images/graemlins/lol.gif" alt="" /> my SWB with the leaf springs never did that.
Just hold the brake and ease the gas a little bit.. and it you can raise your <img src="/forums/images/graemlins/butwiggle.gif" alt="" /> up a couple inches and hold it, hehe.

I miss driving those damn Montys

Just remember it does it in low clearance areas. So dont smash your roof into anything when first putting it into gear. Such as this pic shows. This is after I lifted the raider some. As long as I did not stop in the door it fit but if I took it in and of gear while in the door it would bump. The Raider has been lifted more since then and no longer fits in the garage. <img src="/forums/images/graemlins/frown.gif" alt="" />

Thanks for all the info. Good to know its not another problem to deal with.

Dave

What type of shocks are you running? I bet KYB's would help eliminate some of the squat.

Nothing fancy shock wise. just plain ol' monroes. I plan on using some lwb springs for lift and will probably go better then.

springs huh, where you going to get them <img src="/forums/images/graemlins/wink.gif" alt="" /> <img src="/forums/images/graemlins/wink.gif" alt="" />

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