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Old 05-17-2020, 01:29 PM #1
Texas_4Runner Texas_4Runner is offline
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Rear Sagging 2008 V8 4x4 LTD

Forgive me but Iíve used the search feature and read write ups until my head hurt and Iím still not sure what to do.

I bought this truck 3 years ago. The previous owner had pulled both the XREAS and RAS and swapped it for Bilsteins and FJ Springs.

I noticed a bit of sag anytime I put a lot of gear in the back. It wasnít terrible but it was noticeable. I recently bought a 2500 lb Casita travel trailer and Iím not happy with the rear end. It sags too much and a noise comes from the rear until I hit the off button on the ride height. Iím assuming itís trying to inflate the nonexistent air bags.

1) should I upgrade the entire suspension?
2) is there a modification I could do to the rear end shocks or springs?
3) can I add RAS with the current set up?

Thanks. And I apologize for my lack of suspension knowledge up front.
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Old 05-17-2020, 01:36 PM #2
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IMG_9102.PNG - Google Drive

Picture of the current rear setup.
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Old 05-17-2020, 03:27 PM #3
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Rear Sagging 2008 V8 4x4 LTD

You might need new coils
I would invest and get a heavy duty coil Iím not really sure about the shocks I would say if you have shocks with 50,000 or more miles on them replace them.
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Old 05-17-2020, 08:56 PM #4
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Yea - would defintely start with rear springs - old man emu, dobinsons, toytech some options to start looking at
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Old 05-18-2020, 12:28 AM #5
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Sagging under load is a common issue with a 4 runner and the best fix is airbags. That way you don't have to sacrifice your suspension ride with stiffer springs. You can adjust your ride height according to the load you place in your truck and the trailer you are towing.
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Old 05-18-2020, 07:41 AM #6
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Quote:
Originally Posted by Thebeastlives View Post
Sagging under load is a common issue with a 4 runner and the best fix is airbags. That way you don't have to sacrifice your suspension ride with stiffer springs. You can adjust your ride height according to the load you place in your truck and the trailer you are towing.
Agreed, airbags are the way for coil springs and changing load weights. My RAS system has been great both light offroading and towing.

Edit,
Get an aftermarket airbag helper set and hook it up to the existing compressor, adjust the ride height sensor for whatever height you want to sit at and call it a day. It will automatically level your truck to whatever you want it to be regardless of trailer or load weight, I would just try to find some working pressures on the compressor and bags to make sure they are compatible but in theory it should be fine no matter what. I'm just guessing this would work, it's what I'm going to do at some point when I get mine lifted but still need to tow with it so I'm very confident of being able to make it work.

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Old 05-18-2020, 09:55 AM #7
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Thanks for the replies.

I was hesitant to put stiffer springs on since I only tow a fraction of the time. I think Iíll try the RAS route but I didnít know if it could work the same after the previous owner pulled then XREAS.
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Old 05-18-2020, 05:21 PM #8
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Quote:
Originally Posted by Texas_4Runner View Post
Thanks for the replies.

I was hesitant to put stiffer springs on since I only tow a fraction of the time. I think Iíll try the RAS route but I didnít know if it could work the same after the previous owner pulled then XREAS.
I used airbags on my tundra for 10 years no compressor just use standard air pump to pump them up. Manual systems work forever with nothing to fail on you.. I might tow twice a year so nothing to worry bout in between times.
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Old 05-18-2020, 06:34 PM #9
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I didnít even know that manual was an option. Thanks.
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