Rear suspension is jarring when hitting bumps - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**AngryPirate** · 12-09-2022, 06:24 PM

1960 GMC 1000 series.

New POL rear coil spring, standard ride height

Shocks - replaced about 5 years ago, but they might not be correct

New POL adjustable trackbar (panhard bar).

Whenever I hit a bump (even small potholes) the rear suspension hits HARD and is quite brutal.

The only thing I can think of is that the shocks are underpowered or too short and not able to dampen the rebound from the new coil springs?

Anyone have an good recommendations for rear shocks for these trucks if we think that is the issue?

Thanks for any ideas.

**Backpayne** · 12-09-2022, 08:07 PM

Can you tell us the current model # of shock currently on it?

**AngryPirate** · 12-09-2022, 08:17 PM

Quote:

Originally Posted by Backpayne

Can you tell us the current model # of shock currently on it?

I’ll crawl under tomorrow and take a look.
Might have been NAPA brand, but I forget.

**Bob B.** · 12-10-2022, 03:03 AM

Sounds like a shock problem.

theastronaut · 12-10-2022, 01:54 PM

Pull the two lower shock bolts out then bounce the truck to see if the shocks are too stiff.

Arne · 12-10-2022, 02:12 PM

Quote:

Originally Posted by theastronaut

Pull the two lower shock bolts out then bounce the truck to see if the shocks are too stiff.

Or if the shocks are too short, and top out hard on rebound.

bigmoe · 12-10-2022, 08:13 PM

Quote:

Originally Posted by theastronaut

Pull the two lower shock bolts out then bounce the truck to see if the shocks are too stiff.

What he said, but try bounce on it before and after you unbolt the shocks to compare.

**AngryPirate** · 08-19-2023, 06:05 PM

So, it seems the rear shocks that were on there were too short.

60-62 GMC and Chevrolet's don't usually have rear shocks listed at all the usual places.

I found one posting that pointed towards some Race Car Dynamics Bilstein shocks that fit (Part 55-R148) .

The before and after is quite noticeable.

Thanks all for the responses and suggestions!

12-09-2022, 06:24 PM	#1
AngryPirate Senior Member Join Date: Jan 2012 Location: Austin, TX Posts: 564	Rear suspension is jarring when hitting bumps 1960 GMC 1000 series. New POL rear coil spring, standard ride height Shocks - replaced about 5 years ago, but they might not be correct New POL adjustable trackbar (panhard bar). Whenever I hit a bump (even small potholes) the rear suspension hits HARD and is quite brutal. The only thing I can think of is that the shocks are underpowered or too short and not able to dampen the rebound from the new coil springs? Anyone have an good recommendations for rear shocks for these trucks if we think that is the issue? Thanks for any ideas.

12-09-2022, 08:07 PM	#2
Backpayne Senior Member Join Date: Nov 2015 Location: Seligman, MO Posts: 645	Re: Rear suspension is jarring when hitting bumps Can you tell us the current model # of shock currently on it?

12-10-2022, 03:03 AM	#4
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,369	Re: Rear suspension is jarring when hitting bumps Sounds like a shock problem. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

12-10-2022, 01:54 PM	#5
theastronaut Registered User Join Date: May 2011 Location: Anderson SC Posts: 3,901	Re: Rear suspension is jarring when hitting bumps Pull the two lower shock bolts out then bounce the truck to see if the shocks are too stiff. __________________ Project Goldilocks '66 C10 Short Fleet BBW Build '65 C10 Highly Detailed Stock Restoration Thread '78 Camaro Targa Roof Build '55 International Metal/Body/Paint Work '66 F100 Full Rotisserie Restoration '40 Packard 120 Convertible Coupe Restoration How To Restore and Detail an Original Gauge Cluster How To Detail Sand Body Panels, Edges, Corners, Etc

08-19-2023, 06:05 PM	#8
AngryPirate Senior Member Join Date: Jan 2012 Location: Austin, TX Posts: 564	Re: Rear suspension is jarring when hitting bumps So, it seems the rear shocks that were on there were too short. 60-62 GMC and Chevrolet's don't usually have rear shocks listed at all the usual places. I found one posting that pointed towards some Race Car Dynamics Bilstein shocks that fit (Part 55-R148) . The before and after is quite noticeable. Thanks all for the responses and suggestions!



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