Rear spring rates between models

[Deleted User 412290]

I apologize if this has been asked, I couldn't find anything concrete...

Does anyone know where to find the different spring rates between models ?

I am throwing in a rear .5" spacer on my SR5 to get a little rake back after my bilstein 5100 install, but a member here also gave me his rear springs from a TRD Off Road Hybrid. In theory the hybrid front springs should be stiffer to account for the hybrid's weight and would have given a little lift, but what about the rear hybrid springs when compared to the SR5 ?

The couple dealerships I called couldn't give a definitive answer.

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[Deleted User 412290]

This is what Gemini says, but would love to get some feedback from the pros!

"Engineering Differences:
While both springs will physically fit into the same mounting buckets, they are engineered for very different loads:
Weight Rating (The "Hybrid" Factor): The AK080 springs (Hybrid TRD OR) are the beefiest in this comparison. They are specifically wound to handle the high static load of the NiMH battery pack located under the rear seats and the additional hybrid components.
Ride Height: The AK080 spring provides more "free length" or a higher spring rate to ensure the TRD Off-Road maintains its signature high stance despite the extra hybrid weight. In contrast, the AK070 (SR5 Long Bed) is designed to keep the truck level over a longer wheelbase while maintaining a smoother, passenger-car-like ride quality.
The "Swap" Outcome: If you were to put the AK080 hybrid springs into your gas SR5 Long Bed:
Lift: You would likely see a noticeable lift (0.5" to 1.25") because your truck is significantly lighter than the hybrid it was designed for.
Stiffness: The rear end will feel much stiffer (and potentially "bouncy") because there isn't enough weight to properly compress the high-rate hybrid coils."

 

[rijc99]

Sounds right. I put medium load springs all around and my Truck definitely rides best with 300-400 pounds in the bed. A little when the bed is empty.

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