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63 C10 2-4 drop crazy bounce in rear after large bump
#1437085 Thu Jan 13 2022 03:51 PM
Joined: Mar 2009
Posts: 9
S
'Bolter
I have lowered by c10 with 2 inch lowering springs in the front and 4 inch in the back. I have also replaced all the shocks accordingly. The ride is great EXCEPT when I hit a substantial bump over 40 mph. Then the rear end bounces severely and continuously until I drop below 25-30 mph. It is so severe the truck is almost uncontrollable.

I have not taken anything out of the bump stops and I think this may be the cause. Any suggestions?

Last edited by SQLSleuth; Thu Jan 13 2022 03:52 PM.

'63 C10
-Alan-
Re: 63 C10 2-4 drop crazy bounce in rear after large bump
SQLSleuth #1437093 Thu Jan 13 2022 04:30 PM
Joined: Feb 2004
Posts: 24,297
H
Kettle Custodian (pot stirrer)
I won't mention the obvious cure to your problem, which you probably already know. I was asked to consult with a fellow dirt track racer with a handling problem similar to yours- - - -the car bounced around the track like the rear end was on a trampoline. It turned out he had installed the rear shocks upside down because "that was the way they bolted in!" To make matters worse, the upside down shocks were coil-over "load levelers". Installing a set of 50/50 dampening race shocks in the right orientation solved the problem.

How much travel does the suspension have before the bump stops contact something solid?
Jerry


"Freedom's just another word for nothing left to lose"
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Re: 63 C10 2-4 drop crazy bounce in rear after large bump
SQLSleuth #1437094 Thu Jan 13 2022 04:35 PM
Joined: Mar 2007
Posts: 162
A
'Bolter
Maybe the shocks failed - bouncing should be dampened by the shocks. Even if you are hitting the bumpstops, it should dissipate eventually if the shocks are working with enough travel. However, like Jerry says, if there isn't enough space between the axle and bumpstops the shocks don't get to work enough to absorb the motion.

Re: 63 C10 2-4 drop crazy bounce in rear after large bump
SQLSleuth #1437096 Thu Jan 13 2022 05:00 PM
Joined: Nov 2021
Posts: 263
F
'Bolter
Something has to be binding. When you hit a large enough bump it is unloading and binding/releasing again until you slow down and it settles down. I had a bronco that reversed the shocks like mentioned above. It would take longer to settle, but it would still do it in a reasonable amount of time.


1966 C-10 Step Side. 283, 4spd, 3.73 gear. 60K miles prior to restoration. 507 Paint Code. Currently in 10,000 pieces.
Transmission is done! Rear Suspension is done! Wheels are done! Bed bodywork is done! Soon to order a 383 crate.



Re: 63 C10 2-4 drop crazy bounce in rear after large bump
Hotrod Lincoln #1437098 Thu Jan 13 2022 05:34 PM
Joined: Mar 2009
Posts: 9
S
'Bolter
I have 1 1/2 inches between the axle and the bump stops. It is equal on both sides.
They are BELLTECH Street Performance stocks. I have never seen a shock which got installed with the dust cover upside down on the bottom, but there are many things in life I have not seen.

I would expect to see some type of leakage if either stock had failed.


'63 C10
-Alan-
Re: 63 C10 2-4 drop crazy bounce in rear after large bump
SQLSleuth #1437110 Thu Jan 13 2022 06:38 PM
Joined: Mar 2007
Posts: 162
A
'Bolter
I don't think you have enough travel. The shocks don't work if they aren't traveling enough to dissipate the energy. You are literally bouncing off the bump stops. Since the shocks don't have enough travel in them to absorb the impact you are hitting the bump stops so hard you are bouncing back off them, sending the rear end of the truck back up, probably pretty high... it comes back down so hard it hits the bump stops again and the cycle repeats... Need to shorten the bump stops so there is more clearance between them. This will create more suspension travel towards the body, make sure there is clearance else where for it.

Re: 63 C10 2-4 drop crazy bounce in rear after large bump
SQLSleuth #1437111 Thu Jan 13 2022 06:44 PM
Joined: Mar 2009
Posts: 9
S
'Bolter
Thanks. That was my suspicion. I have between 3 1/2 and 4 inches before the axle will contact the frame. That should give the shocks time to work properly.


'63 C10
-Alan-
Re: 63 C10 2-4 drop crazy bounce in rear after large bump
SQLSleuth #1437209 Fri Jan 14 2022 04:23 AM
Joined: Apr 2005
Posts: 2,997
C
'Bolter
Remove shocks and drive over bump. If it acts the same with or without shocks then IT IS the shocks. Whether rate or lack of travel.


Evan
Re: 63 C10 2-4 drop crazy bounce in rear after large bump
SQLSleuth #1437259 Fri Jan 14 2022 05:09 PM
Joined: Sep 2011
Posts: 2,513
L
'Bolter
My 63 C10 has 3” lowering shocks in the rear. The front was lowered with 2.5” disc brake drop spindles, so it has the original springs up front. I bought an adjustable rear tracking arm from CPP and have new shocks. I have not had any issues. Just mentioning what I have since it’s similar to yours.


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