Hello all,
I currently have a longbox in my car. Unknown what 3rd is honestly, but it's an LRE from 2009 or so(and I think it's a "short/long" with 1.26 3rd and 4.12 ring).
I am building a shortbox as that seems to be the consensus. I have built a bunch of swing trannies before, so don't worry, I've got this.
Anyway, I have a couple of early 60s boxes with 4.37 ring gears. They both have stock ratios of 3.80/2.06/1.26/0.89.
I will have a 1.22 bus 3rd shortly to use, and have deduced that this is a) desirable and b) "long-short".
The question is, how much of an actual difference will the 1.22 3rd make in the Northeast tour: LRP, Thompson. Palmer, and NHMS? It's 125 rpm difference when shifting up there around 6-7k.
Here's a comparison screenshot of the two short gearboxes: long third on left with short third on right.
Disregard P-metric tire size, diameter of the tire is all that matters, and is correct at 22.5".