Quote:
Originally Posted by JIMBO34PA
mike; this has been brought up on tiffin site . To upgrade (replace) rear springs to 26k is a labor consuming issue because the fresh water tank framework is welded and is in the way of the front spring perch bolt. I have checked part numbers on my 2016 24k to a 2017 26k . yes the springs are different and spring deflection ,but rear axles are the same 6:17 , rear brake rotors and calipers are different # but supersede to the same part number . If I ever decide I need the extra capacity I will find a truck spring shop and have a leaf added . Jim
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The rear axle and all things attached (brakes / calipers) are identical between the 24k and 26k.... It is just the springs, please look closely at the chassis spec (link in this thread, and excerpt below) because it can be a bit confusing. They both have the exact same rear axle with a 17,500# weight rating, and the same 9,000# rated front axle.
The 24k is 9k front and 15,500 rear, based on 15.5k springs on the 17.5k axle. Yes, it totals 24.5k, but the total GVWR is only 24k.
The 26k is 9k front and 17,500 rear axle and springs. Yes, 26.5k, front + rear, but only 26k total allowed.
Also, look at the unladen weight between the 2 chassis, with the same wheelbase, it's something like 11# (yes, eleven pounds), that's it.
I think the confusion is that there is a 15k rated rear axel, which is used on the 22k chassis, it is not the axle that is used on the 24k, and yes, it has different rotors and calipers....
And as can be clearly seen here, the rotors are the same size on the 24k and 26k. Also note that the brake size match on the f/r axle configs.
Again, the 17.5k axle is the 17.5k axle.....
Maybe I'm missing something, but it seems to be fairly clear, and it would make little to no sense from a manufacturing perspective to make such minor changes on the 17.5k rear axle assembly that can easily be used on 2 chassis with no modification other than spring ratings.
As for the price difference, I don't get it either. The 22k and 24k chassis are entirely different, and the list price from Tiffin for the upgrade was $3,600 if I remember correctly. Why the difference between the 24k and 26k is $3k is beyond me, other than that's what it is (we have no idea what the price difference is from Ford)....
Regards