TJ Shock & Spring Specification Resource Thread
- Thread starter Chris
- Start date
Haha, well good to know he's still around. He used to be one of the more active members on here but he disappeared some years ago.
Hey man, a 2.5 is a damn good excuse to build a trail rig
Pressurized
TJ Enthusiast
Do we know if the BDS 3" spring is the same as the Zone 3" spring F&R? I assume it would also apply to the 4" spring?
Can anyone please help me understand or at least point me into the right direction why the Rancho RS55128 (Front) is the right shock to use in a 2"-2.5" lift?
Compared to the stock TJ Front Shock it has 13.05 vs 13.00 compressed length, and 21.03 vs 20.50 extended length.
Is it wrong to assume that you would need a shock roughly 2-2.5" longer than the stock one?
Compared to the stock TJ Front Shock it has 13.05 vs 13.00 compressed length, and 21.03 vs 20.50 extended length.
Is it wrong to assume that you would need a shock roughly 2-2.5" longer than the stock one?
55128 Rancho and a 2” Procomp 170in/lb spring.
It is the correct shock for 2-2.5” of lift
I think it’s more of; they don’t know.
A progressive or dual rate spring averages depending on how much it’s being compressed.
deadbeat son
TJ Addict
deadbeat son
TJ Addict
Oops, thanks for the correction, I fixed it.
Anyone have any experience with the Fox 985-26-108 and 985-26-112 (2.0 performance series, reservoir with damping adjuster) for a 3" lift
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Can Rancho RS55239 or RS55128 be used as rear shocks as well?
I thought they were front shocks. Why are they mentioned in the rear shocks section?
I thought they were front shocks. Why are they mentioned in the rear shocks section?
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@Chris I've noticed some minor inconsistencies in some Rancho RS5000x shock lengths.
RS55240 - Compressed: 12.76, Travel: 7.28, Extended: 20.4
RS55241 - Compressed: 13.51, Travel: 8.16, Extended: 21.67
RS55255 - Compressed: 15.8, Travel: 10.73, Extended: 26.53
RS55256 - Compressed: 15.01, Travel: 9.66, Extended: 24.67
By Ranchos Site: https://www.gorancho.com/products/s...shock-absorber/?find=2004-jeep-tj-4wd-4013428
RS55240 - Compressed: 12.76, Travel: 7.28, Extended: 20.4
RS55241 - Compressed: 13.51, Travel: 8.16, Extended: 21.67
RS55255 - Compressed: 15.8, Travel: 10.73, Extended: 26.53
RS55256 - Compressed: 15.01, Travel: 9.66, Extended: 24.67
By Ranchos Site: https://www.gorancho.com/products/s...shock-absorber/?find=2004-jeep-tj-4wd-4013428
Good catch. For how popular these are, it's good to get the info right.
I haven't looked closely, so maybe the answer is obvious, but does this answer your previous question about which Rancho shock is right for a 2–2.5" lift? I always hear that the Ranchos run long, but when I installed mine, I found them to be only a fraction of an inch longer than stock.
Unfortunately I bought RS55128/RS55240. They are not the right ones for my case. I am most likely going to replace them with RS55239/RS55241
That's because OME Light Duty 2" Springs (932/941) gave me around 3" front lift, and around 2.5" rear lift. (it seems that 4-cylinders are extra light!)
So, I had the following results (Real measurements)
RS55128: 5.7" up travel and 2.28" down travel
RS55240: 5.44" up travel, 1.84" down travel
With some maths I calculated that with RS55239/RS55241 I will have the following:
RS55239: 4.32" up travel, 5.09" down travel
RS55241: 4.69" up travel, 3.47" down travel
It is clear that the longer ones are closer to 50 50 ratio, since the shorter ones are giving me a very small amount of down travel. It doesn't seem right.
I am also considering adding a small spacer on front, which will give an almost perfect 50 50 on front shock travel.
*RS55128 (Front) seems to be perfect for around 1-1.5" of lift
** RS55239 (Front) seems to be perfect for around 3-3.5" of lift
*** RS55240 (Rear) seems to be perfect for around 0.5-1" of lift
**** RS55241 (Rear) seems to be perfect for around 2" lift
***** When I say perfect, I mean they seem to have a nearly perfect 50 50 ratio of up travel and down travel.
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Thanks for this. Yep, I remember asking, in a different thread, what amount of lift you got, since I was curious how the weight of the 2.5 would affect it. This is really helpful, and I hope Chris can update the original post with it. I'll also link this post to the "Stock SE" thread.
Edit: Could you add notes, to your * bullet points, about which are for front and rear? Or, I guess it doesn't really matter, because you're just providing the info based on the difference in max length, compared to stock, right?
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I was curious too about how much lift would the OME Light Duty would give me. If I would have to use spacers, or if I would have to replace them with OME HD. Finally, it gave me more than enough for my 31" tires.
I added notes to the * bullet points. Obviously they apply for both 4-cylinder, 6-cylinder or any other engine. I am talking about actual final lift size.
I am happy to gather every info possible for our light TJs.
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