Rear bypass shocks

4runick

4runick

New member
Hi,

Been thinking a lot at rear bypass shocks. Dirt king used to sell them and I believe down south still does.

There's not much on these forums about it but anyone have opinions?

I prefer desert/Baja driving. Want the rear to stay on the ground and dampen the best that it can.

Been trying to look for some used bypasses but not sure about what will fit and travel length.

Will king ever come out with a kit like the Tacoma's with a 3.0 coilover and bypass rear?

"I wanna go fast"
-Ricky Bobby
 
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BTW Running kings that have been tuned for speed ha.

Front With duro bumps up front set to 2.5" of lift and UCA. None of this 3 inch bullsh*t.

Rear has 2 inch lift springs with wheelers bump stops
 
4runick said:
Hi,

Been thinking a lot at rear bypass shocks. Dirt king used to sell them and I believe down south still does.

There's not much on these forums about it but anyone have opinions?

I prefer desert/Baja driving. Want the rear to stay on the ground and dampen the best that it can.

Been trying to look for some used bypasses but not sure about what will fit and travel length.

Will king ever come out with a kit like the Tacoma's with a 3.0 coilover and bypass rear?

"I wanna go fast"
-Ricky Bobby
Click to expand...

Bilstein 8100? They are boutique made in San Diego, specialty shocks, so availability right now is an issue but they are a fantastic off-the-shelf solution.

I will get the front 8112 when the option with dual compression adjusters comes out. They are more sophisticated shocks than anything else on the OEM direct fit market for a 4Runner.

The bypass adjusters on the 8100 do make a difference.
 
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I've read that an 8in stroke shock works in the rear, so if that's true (and if it's not, just need to find the right stroke for your setup) then any off the shelf bypass that is 8in stroke would work.

For OEM replacement bypasses, the Bilstein 8100's are it I believe. They do pretty well considering the small amount of travel. There's a guy on youtube that has made some vids showing him in Glamis and testing in Ocotillo Wells with them in his 4th gen. Drone footage of glamis duning in a 4runner - YouTube

So you currently have the 2.5 Kings in the rear and still getting some hopping? I too like going fast and have tried Bilstein 5160's and now running Ironman 4x4 Foam Cell Pro's with Ironman's HD 2in spring and Durobumps. Wanted to go Kings, but I'm also building a 2WD F150 for the dez, so saving the money shocks for that.
 
few guys have bypasses. I believe the issue is the tube layout for clearance. hit up DOM (DRkdss) on IG hes running them. Hydraulic bump stops are also a great add on for the rear. ICON has their in the spring setup, i'm running the total chaos mounts and the king threaded bumps on the outside of the frame rails. is bueno.

the back end on ours feels pretty dialed considering its stock pivots. Kings, Wheelers (toytec HD when were loaded up) King bumps. No bucking.
 
MAST4R said:
Bilstein 8100? They are boutique made in San Diego, specialty shocks, so availability right now is an issue but they are a fantastic off-the-shelf solution.

I will get the front 8112 when the option with dual compression adjusters comes out. They are more sophisticated shocks than anything else on the OEM direct fit market for a 4Runner.

The bypass adjusters on the 8100 do make a difference.
Click to expand...

Ya I actually almost bought those once just hovered over the pay button. I feel like I want to see what they do to improve them but doesn't seem like they need to. I always wanted progressive damping so never really went that route.
 
honda250xtitan said:
few guys have bypasses. I believe the issue is the tube layout for clearance. hit up DOM (DRkdss) on IG hes running them. Hydraulic bump stops are also a great add on for the rear. ICON has their in the spring setup, i'm running the total chaos mounts and the king threaded bumps on the outside of the frame rails. is bueno.

the back end on ours feels pretty dialed considering its stock pivots. Kings, Wheelers (toytec HD when were loaded up) King bumps. No bucking.
Click to expand...

Thanks!
 
dezertbomber said:
I've read that an 8in stroke shock works in the rear, so if that's true (and if it's not, just need to find the right stroke for your setup) then any off the shelf bypass that is 8in stroke would work.

For OEM replacement bypasses, the Bilstein 8100's are it I believe. They do pretty well considering the small amount of travel. There's a guy on youtube that has made some vids showing him in Glamis and testing in Ocotillo Wells with them in his 4th gen. Drone footage of glamis duning in a 4runner - YouTube

So you currently have the 2.5 Kings in the rear and still getting some hopping? I too like going fast and have tried Bilstein 5160's and now running Ironman 4x4 Foam Cell Pro's with Ironman's HD 2in spring and Durobumps. Wanted to go Kings, but I'm also building a 2WD F150 for the dez, so saving the money shocks for that.
Click to expand...


Hey thanks, I have seen those videos. I should just do the complete package 8112)8100.

I'm not getting too much hopping. Just want more control in the rear and have some control at the end of compression. Also if I go long travel front I want to make sure the rear can keep up with not a ton of make fabrication.
 
4runick said:
Hey thanks, I have seen those videos. I should just do the complete package 8112)8100.

I'm not getting too much hopping. Just want more control in the rear and have some control at the end of compression. Also if I go long travel front I want to make sure the rear can keep up with not a ton of make fabrication.
Click to expand...

Old Man Emu has some internal bypass that has external rebound and compression adjusters.

Old Man Emu BP-51 Internal Bypass Reservoir Shocks Rear Pair for 2010- – Shock Surplus
 
4runick said:
Ya I actually almost bought those once just hovered over the pay button. I feel like I want to see what they do to improve them but doesn't seem like they need to. I always wanted progressive damping so never really went that route.
Click to expand...

The 8000 series is linear damping.

Why do you want progressive, which would suck on pavement? Also, don't assume that King is progressive. You need to call them and see what damping they actually use in their OEM replacement kits for 4Runner.

I guess they use linear and not progressive for this kit.

Also, it is totally an option to have 8100 rears with Fox front or King front.

I like Radflo and they are cheaper but I have also heard complaints that their quality is inconsistent.
 
I believe there are some pre production ICON rear bypasses out in the world. Part of the Omega series like they do for the Slinky setup for Land Cruisers. I don't know how they perform. But they look the part at least.

The other outside the box thought would be to try a set of TRD Pro bypass fox shocks. Maybe they're fantastic. I don't know anyone who really uses a TRD Pro with the OEM suspension that pushes it really hard and I've never had the opportunity myeslf to try it with a TRD Pro fox suspension setup. But it could be great. Could be crappy. Just don't know. I'd bet they're at least decent given the resources Toyota has and the internal design being pretty good.

Along the lines of the TRD Pro 4R rear shocks - I don't know how the fit would be for a lifted 4R to use Tundra TRD Pro rear bypass shocks. I considered some take off Raptor rears, weight is actually pretty close, but they're way too long to even install. They're about 4 inches too long. Tundras are basically the same length as 4Runners though. So they might work as another alternative with firmer valving.
 
Jetboy said:
I believe there are some pre production ICON rear bypasses out in the world. Part of the Omega series like they do for the Slinky setup for Land Cruisers. I don't know how they perform. But they look the part at least.

The other outside the box thought would be to try a set of TRD Pro bypass fox shocks. Maybe they're fantastic. I don't know anyone who really uses a TRD Pro with the OEM suspension that pushes it really hard and I've never had the opportunity myeslf to try it with a TRD Pro fox suspension setup. But it could be great. Could be crappy. Just don't know. I'd bet they're at least decent given the resources Toyota has and the internal design being pretty good.

Along the lines of the TRD Pro 4R rear shocks - I don't know how the fit would be for a lifted 4R to use Tundra TRD Pro rear bypass shocks. I considered some take off Raptor rears, weight is actually pretty close, but they're way too long to even install. They're about 4 inches too long. Tundras are basically the same length as 4Runners though. So they might work as another alternative with firmer valving.
Click to expand...

Have a buddy with a GX install these, though it's not lifted. Did really well on our fast paced trip through Anza Borrego to Superstition OHV.

To the OP, in order to compare shocks that not listed as OEM direct fits, you just need to get the extended and collapsed lengths and it will tell you if it's the same or close. Being straight axle in the back, there's a 1:1 motion ratio so the travel number of the shock will be equal to the travel of the rear suspension. If you can find out the travel and/or extended and collapsed lengths then you can use these to shop for any bypass that fits within tolerance. Might need to extend your bumpstops if longer body shocks and possibly run limit straps if a non-OEM replacement shock as they're not meant to be your droop limiter and could be damaged internally if they were.
 
Last edited:
MAST4R said:
The 8000 series is linear damping.

Why do you want progressive, which would suck on pavement? Also, don't assume that King is progressive. You need to call them and see what damping they actually use in their OEM replacement kits for 4Runner.

I guess they use linear and not progressive for this kit.

Also, it is totally an option to have 8100 rears with Fox front or King front.

I like Radflo and they are cheaper but I have also heard complaints that their quality is inconsistent.
Click to expand...


Good points. I've always been told that the kings and fox are progressive.

Ya just learned that the 8100s are linear because they are bypasses. Could be a very good option. Just watched the shock surplus video on the bilsteins. They seem pretty awesome. Should I be really saving for long travel?
 
honda250xtitan said:
few guys have bypasses. I believe the issue is the tube layout for clearance. hit up DOM (DRkdss) on IG hes running them. Hydraulic bump stops are also a great add on for the rear. ICON has their in the spring setup, i'm running the total chaos mounts and the king threaded bumps on the outside of the frame rails. is bueno.

the back end on ours feels pretty dialed considering its stock pivots. Kings, Wheelers (toytec HD when were loaded up) King bumps. No bucking.
Click to expand...

I hit up drkdss hes a wealth of knowledge
 
Jetboy said:
I believe there are some pre production ICON rear bypasses out in the world. Part of the Omega series like they do for the Slinky setup for Land Cruisers. I don't know how they perform. But they look the part at least.

The other outside the box thought would be to try a set of TRD Pro bypass fox shocks. Maybe they're fantastic. I don't know anyone who really uses a TRD Pro with the OEM suspension that pushes it really hard and I've never had the opportunity myeslf to try it with a TRD Pro fox suspension setup. But it could be great. Could be crappy. Just don't know. I'd bet they're at least decent given the resources Toyota has and the internal design being pretty good.

Along the lines of the TRD Pro 4R rear shocks - I don't know how the fit would be for a lifted 4R to use Tundra TRD Pro rear bypass shocks. I considered some take off Raptor rears, weight is actually pretty close, but they're way too long to even install. They're about 4 inches too long. Tundras are basically the same length as 4Runners though. So they might work as another alternative with firmer valving.
Click to expand...

Very interesting. When the fox bypasses started coming on the trd pros I was really curious how they would perform. I've looks for people's thoughts but maybe not hard enough. I like the thought of the tundra rears that would be pretty cool to try out. I wonder if they are rebuild able and would take a tune.
 
dezertbomber said:
Have a buddy with a GX install these, though it's not lifted. Did really well on our fast paced trip through Anza Borrego to Superstition OHV.

To the OP, in order to compare shocks that not listed as OEM direct fits, you just need to get the extended and collapsed lengths and it will tell you if it's the same or close. Being straight axle in the back, there's a 1:1 motion ratio so the travel number of the shock will be equal to the travel of the rear suspension. If you can find out the travel and/or extended and collapsed lengths then you can use these to shop for any bypass that fits within tolerance. Might need to extend your bumpstops if longer body shocks and possibly run limit straps if a non-OEM replacement shock as they're not meant to be your droop limiter and could be damaged internally if they were.
Click to expand...

He installed the trd pros or the 8100s?
 
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