Extended bump-stops or bump stop extensions for lifted 80

Joined
Feb 5, 2013
Messages
143
Location
Portugal
Hi,

I use to run OME850 and 860 along with some custom shocks that had the measures of the OME L shocks, after some use I had some issues with the shocks.
Nowadays I'm running Kind Springs HD in my rig, KTFR-69HD and KTRR-70HD , along with the same shocks.

Last week I've sent my shocks for maintenance and the builder said that the shocks weren't in great shape due to over-compression, they even had some stuff broken inside. So this bump stop issue came to my mind and here I am with a couple of questions to mend this issue.

Since I can measure my rig cause it's at the mechanic... I'll go with some made up values just to check if I understood this....

With the truck sitting at ride height, measure the exposed shaft on the shock. Then measure the gap between the bottom of the bumpstop and the axle housing and subtract 1".
Shock shaft - 4''
gap - 3'' -1'' = 2'' ( basic!!)

If the exposed shaft length is longer than the gap between the bumpstop and housing, that is the minimum extension you need for the bumpstop.
So my case would fill in this scenario, what would be the minimum measure for the bump stop extension? the gap minus 1'' in my example 2'' extension? Is this the correct thought?

Cheers
 

lumbee1

Native American
Joined
Sep 21, 2011
Messages
2,621
Location
Holly Springs, NC
Hi,

I use to run OME850 and 860 along with some custom shocks that had the measures of the OME L shocks, after some use I had some issues with the shocks.
Nowadays I'm running Kind Springs HD in my rig, KTFR-69HD and KTRR-70HD , along with the same shocks.

Last week I've sent my shocks for maintenance and the builder said that the shocks weren't in great shape due to over-compression, they even had some stuff broken inside. So this bump stop issue came to my mind and here I am with a couple of questions to mend this issue.

Since I can measure my rig cause it's at the mechanic... I'll go with some made up values just to check if I understood this....


Shock shaft - 4''
gap - 3'' -1'' = 2'' ( basic!!)


So my case would fill in this scenario, what would be the minimum measure for the bump stop extension? the gap minus 1'' in my example 2'' extension? Is this the correct thought?

Cheers
I might have been drinking when I wrote that previous post because I don't understand it.

You want the exposed shock shaft to be more than the gap between the bumpstop and axle housing, otherwise the shock will bottom out first. Ideally, you want the bumpstop to be 1" closer to the axle housing than the exposed shock shaft. The 1" is for deformation and compression of the bumpstop. The shock bumper is much smaller and only has about 1/4" of compression before the shock bottoms out.

From your example: the exposed shock shaft is 4", you want the gap between the factory bumpstop and axle to be 3" for maximum flex and protection of the shock. If the gap is bigger than 3", then you will need to make a spacer for the bumpstop that brings it down. If the gap is less than 3", then you are limiting your flex.
 

LandCruiserPhil

Peter Pan Syndrome
Supporting Vendor
 
 
Joined
Mar 10, 2004
Messages
23,896
Location
Scottsdale Arizona
You can make bump stop extension out of just about anything. In order to determine the perfect sized bump stop you want to remove your springs and cycle your suspension. I run J springs and L shocks with 2" shock extensions requiring a 1.75" bump stop spacer and spring retainers.

1954457

1954458
 
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