Here's my reply to your email. Might as well post it here so other people can benefit from the info.
Ray,
Thanks for the kind words. Yes I’m using ultralite cases and ofna Hyper 7 diff on one of my trucks. The gmaxx uses ultralite cases with ofna 8 spider diffs (stronger than the 6 spiders). There will be no mods needed to fit them.
Here’s the link for UE’s Ultralite cases:
http://www.unlimitedengineering.com/...ore/13551.html
You’ll need 2 of these. You’ll need shims for use with the Ofna Hyper 7 diffs.
8x10mm in varying thickness (.05mm, .1mm, .2mm)
6x8mm in varying thickness (.05mm, .1mm, .2mm)
4x6mm in varying thickness (.05mm, .1mm, .2mm)
Bearings you need:
8x16x5mm (8)
You need rcmonster coupler (2)
For the diff output shaft, you can either buy those from RCmonster or make them like I did. You need the revo stub axles. Just cut the threaded portion off. That’s what Mike basically did. A pair of Revo stub axles costs $4.79 at Tower so you need 2 pairs.
http://www3.towerhobbies.com/cgi-bin...?&I=LXHFY7&P=7
Here are the Ofna Hyper 7 diffs. You can see the diff outputs I made in the foreground.
If you dont want to buy the coupler, you can drill the plastic yoke to 8mm like I did here:
But you also need to drill a 2.5mm hole on the pinion shaft so you can use the stock setscrew.
Here's what it looks like on the UE ultralite case:
GA 7075T6 bulks and UE ultralite cases:
I only recommend things I have personal experiences knowing that it will work
. I researched all this stuff last year.
Here's the 8 spider diff and UE Ultralite cases I'm using on the Gmaxx:
Lito