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Old 07-06-2022, 11:25 AM #1
studebaker studebaker is offline
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2WD vs 4WD rear suspension
Is the rear suspension setup different between the 2WD and 4WD models?
Reason I ask is that I am considering the Timbren TOR4R rear kit but they only have 4WD listed.
I had Air Lift air bags that fit inside the coil springs but they are not working now. I want something that will keep the rear up when I pull a car trailer.

TOR4R - Suspension Enhancement System | Timbren Industries Inc. Suspension Products

Thanks!
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Old 07-06-2022, 11:51 AM #2
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Quote:
Originally Posted by studebaker View Post
Is the rear suspension setup different between the 2WD and 4WD models?
Reason I ask is that I am considering the Timbren TOR4R rear kit but they only have 4WD listed.
I had Air Lift air bags that fit inside the coil springs but they are not working now. I want something that will keep the rear up when I pull a car trailer.

TOR4R - Suspension Enhancement System | Timbren Industries Inc. Suspension Products

Thanks!
They should work. The frames are the same.

Personally, I would get another set of Airbags. Mine have been super reliable even with me maxing out my flex a lot...
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Old 07-06-2022, 02:16 PM #3
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Everything in the rear is compatible except for upper links between 2WD and 4WD. Springs and shocks will have different OEM part numbers, which might be why they don't say is crosses over.

-Charlie
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Old 07-06-2022, 09:04 PM #4
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Quote:
Originally Posted by phattyduck View Post
Everything in the rear is compatible except for upper links between 2WD and 4WD. Springs and shocks will have different OEM part numbers, which might be why they don't say is crosses over.

-Charlie
Whats different about the upper links between the 2WD and 4WD?
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Old 07-07-2022, 12:13 AM #5
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Quote:
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Whats different about the upper links between the 2WD and 4WD?
2wd upper links are shorter than 4wd upper links. It changes the pinion angle which is necessary for the two different rear driveshaft designs.
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Old 07-07-2022, 09:29 AM #6
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These Air Lift bags worked well for a year or two, now leak down fairly quick and using soap solution sprayed on from the air valve back to the bags themselves, I can not detect the air leak.
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Old 07-07-2022, 11:11 AM #7
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I sent pictures and measurements of the 2WD version to Timbren and received this reply-

Hi Kerry, My engineer states you will be ok to use kit TOR4R
Thanks
Jeanne

Customer Service Team
Timbren Ind.
320 Hopkins St
Whitby, ON Canada
L1N 2B9
Office: 1-800-263-3113
Timbren.com
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Old 07-07-2022, 12:14 PM #8
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Quote:
Originally Posted by studebaker View Post
I sent pictures and measurements of the 2WD version to Timbren and received this reply-

Hi Kerry, My engineer states you will be ok to use kit TOR4R
Thanks
Jeanne

Customer Service Team
Timbren Ind.
320 Hopkins St
Whitby, ON Canada
L1N 2B9
Office: 1-800-263-3113
Timbren.com
The product description states "There should be a ½” to 1 ½” gap between rubber spring and frame to ensure unloaded ride quality" so you may need to get taller springs or spring spacers for the rear to achieve the recommended gap. Something to keep in mind.
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Old 07-07-2022, 01:37 PM #9
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Quote:
Originally Posted by Bad Luck View Post
The product description states "There should be a ½” to 1 ½” gap between rubber spring and frame to ensure unloaded ride quality" so you may need to get taller springs or spring spacers for the rear to achieve the recommended gap. Something to keep in mind.
That'll depend on the year. My 2WD was at ~20" all around, even at 15+ years old. Ride height between the 2WD and 4WD is basically the same (other than the '99 4WDs).

Another option for towing and not much lift is the OME 2906 springs, but they will be a 2" lift unloaded (~22" hub center to fender lip).

-Charlie
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