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Discussion Starter #1
While doing my oil change today, I noticed these. What are these?

They sure don't look good. Only 30k miles on truck -- surprised/disappointed these are so fried.

Two pics -- one on drivers side facing toward front of vehicle, one on passengers side facing toward front of vehicle.

I'm guessing the repair is beyond my mechanical skills and tools. So what am I looking at $ wise on this repair? And is there a better solution than whatever this crappy OEM material is made of?

Thanks!
 

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Jounce bumpers AKA bump stops go to dmaxstore.com new Z71 pointed style are like 50 bucks. One 15 mm nut hold them on 10 min job tops.


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Jounce bumpers AKA bump stops go to dmaxstore.com new Z71 pointed style are like 50 bucks. One 15 mm nut hold them on 10 min job tops.


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What he said. I replaced with the Z71, noticeable difference
 

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Discussion Starter #4
Jounce bumpers AKA bump stops go to dmaxstore.com new Z71 pointed style are like 50 bucks. One 15 mm nut hold them on 10 min job tops.


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Thanks Texas! You've pointed me in the right direction. Glad I'm not looking at big $'s for a repair. Doing searches and coming up w/ quite a bit of info.

Looks like the way most people are going is the Z71 pointed style as you say. Have seen anyone actually confirmed the material difference, if any, between the two types? I'm sure as heck not going back w/ the original type. 30k miles on my 7 year old truck -- they must have disintegrated b/c of the air.

Any step by step install instructions anywhere? Can I do this w/ truck on ground or do I need to jack up?
 

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Jack it up to get the weight off it, one nut and the old one will fall out. Replace and repeat on the other side.
 

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Moved to suspension and steering
 

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is your torsion bars lowered? It looks like the reason this happened is because the truck is always riding on them. I may have been told wrong but I was told to try to keep space between them and arm when dropping my front end.
 

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is your torsion bars lowered? It looks like the reason this happened is because the truck is always riding on them. I may have been told wrong but I was told to try to keep space between them and arm when dropping my front end.
Frankly, I don't know -- how can I tell?
 

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Discussion Starter #9
Jack it up to get the weight off it, one nut and the old one will fall out. Replace and repeat on the other side.
Thanks, Loader. To confirm, jack up one side off the frame until the front wheel is off the ground -- yes?
 

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Discussion Starter #10

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If there is more than 1/2" between the bump stops and the metal stop they ride against then probably so. Yes jack up by the frame to get some clearance between the bump stop and remove the nut. You can also measure from the ground to the center of your wheel openings if the measurements are within 1" you are definitely cranked.


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Discussion Starter #12
is your torsion bars lowered? It looks like the reason this happened is because the truck is always riding on them. I may have been told wrong but I was told to try to keep space between them and arm when dropping my front end.
I took another look at them last night. The "hump" in LCA (???) in the pics I posted falls away so to speak, such that the bump stops sits behind it. I put my pinky under the bump stop and if it wasn't disintegrated I believe there would be a slight amount of space between them and the LCA (???).
 

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I keep these bumpers in stock if I can help. These bumpers wear over time. On all trucks. I have replaced numerous ones of these. Just install new ones and see where the gap/clearance is at and we can adjust accordingly if needed. Should be fine as is I would assume.
 

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Discussion Starter #14
If there is more than 1/2" between the bump stops and the metal stop they ride against then probably so. Yes jack up by the frame to get some clearance between the bump stop and remove the nut. You can also measure from the ground to the center of your wheel openings if the measurements are within 1" you are definitely cranked.


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Thanks, Texas. I definitely don't think there is more than 1/2" between the bump stop and the metal stop right now, but it is a bit difficult to tell for sure since they have pretty well trashed/disintegrated. I'll have to remeasure after I install the new ones.

Not sure I quite follow you on your last sentence. Within 1" of what?
 

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Discussion Starter #15
I keep these bumpers in stock if I can help. These bumpers wear over time. On all trucks. I have replaced numerous ones of these. Just install new ones and see where the gap/clearance is at and we can adjust accordingly if needed. Should be fine as is I would assume.
Thanks, mreeves. Sounds like a gameplan. I suspect my torsion bars have not been cranked (given the stock nature of the truck went I bought it) but I guess we'll find out. It did come with 265 tires on it so perhaps there is a chance the previous owner cranked it but I doubt it. Not sure cranking is really needed for 265's vs 245 eom's.
 

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Great job of inspecting your truck while you were under there! When I was serving my apprenticeship they told me time after time that 95% of a service was the inspection you do during the service. Those quickie lube places generally only look at stuff they're trained to try to sell and could care less about jounce brackets, leaking shocks, etc.
 

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is your torsion bars lowered? It looks like the reason this happened is because the truck is always riding on them. I may have been told wrong but I was told to try to keep space between them and arm when dropping my front end.
My old school front end mechanic told me the same thing, the bumper/jounce/thingamabob is secondary, let the torsion bar and shock do their job before coming in contact with these. About a 1/4 clearance is where he set mine at. Got into a big heated debate not to long ago on this subject.

OEM are just fine although energy suspension does have some polyurethane replacements, be sure to have your front aligned when raising it to the correct ride height
 

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Discussion Starter #18
I replaced them today.

Here's some pics of the old ones -- one w/ flash, one w/ no flash.

Can you say toast?
 

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Discussion Starter #19 (Edited)
Here are some pics of the new Z71 jounce / bump stops installed.

You can see these definitely, but barely, touch the LCA's. There is most definitely not a 1/4" gap.

As such I would assume my torsion bars have been cranked -- would you agree? Could there by any other explanation? Old/bad shocks?

Perhaps a visit to an alignment shop is in my near future to get the front set back to spec (or adjusted to fit 265's).

Driver's side
 

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Discussion Starter #20
Passenger side
 

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