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'08 rear suspension

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Old 02-24-2008, 02:06 PM   #21
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Quote:
Originally Posted by TacoTurd View Post
Not as a function of carbon content.

My point is nobody is alloying steel to change the section modulus of a Toyota leaf spring. It's a silly notion. I'm all about silliness, but not when it comes to metallurgy.

The section modulus of a leaf spring will be directly proportional to the material modulus and the width, but the cube of the THICKNESS. Guess which knob it makes sense to twist.

OK OK I'm going back to the MPG threads now...
wait aren't the 08 rear leaf springs made from nanotubes?
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Old 02-24-2008, 07:16 PM   #22
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Hey Klown and everyone else, what is your manufacturing date of your 08?
(driver doorpost sticker).

I'm 08 / 07 = August 2007 with the weak springs.

Maybe we can find out when Toyota changed over to the "stronger" springs (if they did at all).
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Old 02-24-2008, 08:18 PM   #23
My other ride weighs 200 tons
4x4x4trd is one of the sharper tools in the shed4x4x4trd is one of the sharper tools in the shed4x4x4trd is one of the sharper tools in the shed4x4x4trd is one of the sharper tools in the shed4x4x4trd is one of the sharper tools in the shed4x4x4trd is one of the sharper tools in the shed4x4x4trd is one of the sharper tools in the shed4x4x4trd is one of the sharper tools in the shed4x4x4trd is one of the sharper tools in the shed4x4x4trd is one of the sharper tools in the shed4x4x4trd is one of the sharper tools in the shed
 
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Quote:
Originally Posted by klown View Post
Yeah, toyota corporate tells me the rear leaf springs have been redesigned to address the TSB. I tried to get the TSB but was told by toyota corporate that the TSB wasn't applicable to 2008 models. The issue was apparently addressed with a newly redesigned rear leaf spring. I hope this is the truth, cause I like the stance of my truck as it is, I don't really want the rear end to be raised up due to the fourth leaf spring. I'm glad you've given your account with about 400lbs of stuff in the back. When I load my bed up I will check the ride also, but at this point it doesn't look like it's an issue for 2008 model years.
I agree that I like the ride and stance of my truck with the three leaf springs now on it. I have a tonneau cover and a small tool box in back and have only had about 300# of load on it to date. I liked the way it rode then with no squat or bottoming out.

I just checked the #'s on top of the springs and there are more symbols than what the TSB is showing.

The right rear leaf had (++ CHI 48210-04550 F-RH 311007) on it and the left rear leaf had (++ CHI 48220-04190 F-LH 021107) on it. This truck is a 1-08 manufacture date on a Gulf States truck for TX. These are the same #'s of the replaced springs with the addition of the extra symbols. I'm hoping ++ & F for thicker and firmer springs. Anybody have any feedback for the extra symbols.

I haven't towed a trailer with gear in the back to see if it is a issue yet. As stated in a earlier thread the dealer ordered the TSB parts and then declined to do the work until it is a offical TSB for the '08's. Having paid for the TRD and towing packages I expect it to ride more like a truck than a car to perform for what it was purchased for. I feel that my '99 with the TRD package was a way softer ride when compared to this truck.
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