That shock is too short for whatever setup you have. This is why shocks should not be selected based on lift height.Not sure how true this is. I have these exact shocks with my rear being lifted 2.75” and I don’t have have 4”/4” up/down travel. I’m more like 5.75”/2.25”
13.51".You should quit trying to make what we are saying translate into what you believe. It is very clear you are not trying, you have a preconceived notion of how shocks work and it is entirely backwards from reality.
Let's start with the basics.
What is the compressed length of a shock?
That's what I'm saying! I think you and I ventured down this rabbit hole in the other thread.That shock is too short for whatever setup you have. This is why shocks should not be selected based on lift height.
Not "the" shock, a shock, any shock. The compressed length is the number represented by the mounting point to mounting point measurement when the shock shaft is pushed all the way into the body of the shock and it can get no shorter.13.51".
Cut those useless boots off with a box knife.Ok so I wasn’t able to get back on this forum until now. I was unable to get the shaft length because the boots are extremely stiff to move out of the way.
But I was able to measure where it is sitting at right now. From mid-loop to mid-loop, it is sitting at 20.5 inches. According to the rancho website the extended length should be 24.67. And when the shocks are totally compressed are 15.01 or at least should be.
I took it to my mechanic and he was nice enough to help me out with measurements and told me everything looked good and to just add weight to the back of the Jeep however I wanted to know what you guys think. I measured the springs as well and it still gives a 3 inch difference compared to sto
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I’m a woman haha! But yeah so when I drive on not very smooth roads going maybe frim 10-45 Mph it bounces. I also had 2 guys get on the rear bumper and they tried to jump up and down to see if it would compress and it just will not. It feels, bumpy/jumps a lot on the road when I know it shouldn’t. At least that’s not how the front shocks felt when they were first installed and they’re the same height and same model....But he said "when he drove off" which inclines me to believe "pulling out of a parking lot", and he's in Houston so the only altitude/ terrain changes are parking garages, potholes, and dead crackheads.
So then in my case, ride height dimensions is currently at 20.5 in. If the shock is installed (15.01 compressed length), then that would give me 5.49 inches of up travel and down travel.Not "the" shock, a shock, any shock. The compressed length is the number represented by the mounting point to mounting point measurement when the shock shaft is pushed all the way into the body of the shock and it can get no shorter.
But, since you posted up a dimension, we'll work with that.
Theoretical numbers for the sake of illustration only.
Let's assume that your ride height dimension between shock mounting points is 18.51". If you install that shock, you will have to extend the shaft out of the body exactly 5". That gives you 5" of uptravel and the remainder as down travel.
If you grab a shock that has a compressed length of 16.51" and install it in the same 18.51" ride height mounting distance, you only have to extend the shock shaft 2" to install it. That also means that the shock only has to move the shaft in 2" to fully bottom out and deliver a jar or harsh event to the chassis when you are driving. That is what we call a shock that is too long.
Sorry about that!I’m a woman haha!
From what I have measured it has a 3 inch lift. If you look at the pics I posted, the Rear springs show 11 inches. The front ones show 15. I had already purchased the front rancho shocks in February and I knew it needed the rear but since Covid, I didn’t really move the Jeep for about 6 months or so (I’m a student so everything got canceled).Sorry about that!
Do you know what size lift you have?
Stock front springs are 12", rears are 8", anything above that is your lift height. If you have a body lift don't include that for shocks. The Ranchos run a bit long, by the looks of your TJ the 0-2" would be what you want.
I had that issue with another brand of shocks. it sounds like valves are stuck inside the shock, not allowing them to compress. Call whomever you bought them from and get them replaced.I don’t know if I mentioned this but according to the guys at the shop, when they first removed the zip tie from the shocks, they didn’t extend on its own to reach max extended length.
They had to physically pull the mid-loop on the shaft side to make it extend. In addition to that, when we did the measurements and disconnected the rear shocks, both shocks were stuck in that same ride height position. Once again they had to be pulled to extend them measure the extended length. When they were going to compress it and put them back in, they really struggled a lot to get them compressed. Both of them.
Something is binding or installed incorrectly. You should easily be able to push down on the rear of a TJ and have the suspension move. The shocks are the correct length or close enough not to cause problems and the chances of both shocks being defective in the same way is very small. You have what looks like a welded raised track bar mount in the rear. I wouldn't be surprised if something is binding or making hard contact where it shouldn't be. Maybe you need another set of eyes on that thing.I also had 2 guys get on the rear bumper and they tried to jump up and down to see if it would compress and it just will not. It feels, bumpy/jumps a lot on the road when I know it shouldn’t. At least that’s not how the front shocks felt when they were first installed and they’re the same height and same model.