Kyosho ST upgrade to STRR and Conversion

[Gee]

I've was planning on working on converting my Kyosho Inferno st us sport this winter. Well looks like winter has come early this year. I was out searching for the best buy on a servo saver set from HPI. Was going around checking the usual places. I still have Impakt RC book marked on the NEU motors page from when I was searching for one to put in the evo. In habit I scrolled down to see what was in stock. This time it looked like everyting was out except for the 1515 1y S. I had to take a double take on that. When I bought the one for the evo. I was actually staring at that same page wondering if I should buy one of the other 1515's and the out of stock notice changed right in front of me. So that started the avalanche. I checked to see if mike had a 1515 in stock before I went ahead and bought it there. Came back to RCM and got a front cover and a motor mount for it. Went to amain and got the STRR universial rear center shaft to fit the extended STRR chassis that I got from Dragon RC a couple of weeks ago. Forgot about the pinion so order a 14t mod 1 from them. I got a 16t from mike last week. Money was going out as fast as the internet would take it. So I used the 3 pay at tower and picked up a FP 4s2p 50000 lipo and finally ordered the HPI servo saver set that I started out to buy. Looks like the balls rolling now.

Still got some parts to gather before the ST becomes a legit ST-RR but I got what's needed to run the extended chassis and have some big bores on the back. Figured I would upgrade the differentials when they got out. Speaking of differentials...

What is the gear ration for the differential in the inferno? Are they the same for the US Sport and the ST-RR? I was using the 8th scale buggy 43/13 on the parameter solver/calculator.

Better get to bed so I can make it to work on time and pay for this.