Just got off the phone with Ken from Advance Adapters...here's the direct poop on the RocBox

Estimated availability: March
Low range: 3.44:1
High Range: 1:1
Internals: Gear Driven, straight cut
Length: Box by itself: ~5"
Length: Box with required adapters from SM465 to early TC: ~9-10"
Adapters for: Most any tranny, ONLY 16-spline and 10-spline LC cases....NOT the split case
Cable shifted unit, must stop to shift
Est. Pricing with adapters: $1200

Currently installing a prototype into a FJ40. Hope to have final testing done soon. Some things may change from current prototype to production, like helical cut gears or a lever shift.

Hopefully, that covers any questions..... ;)

What is the low range numbers with the 420 again? I know this has been posted here before, but I can't find it.

Originally posted by rabid
What is the low range numbers with the 420 again? I know this has been posted here before, but I can't find it.


Do you mean first gear? if so 7.05 is it.


Will this setup work between an sm420 and a dana 20 t-case?

As far as input side, it'll work with any sort of adapter that has a 10 or 16 spline LC one-piece case looking output. As far as its' output, only with the 10 and 16 spline LC cases unless you want to buy MORE adapters.
Its' best most "sanitary" use will be between either an H41/42 and 16 spline TC or NV4500 and 10 or 16 spline TC, preferably beefed with billet case or cast iron case (I'm doing the 4500 and cast iron TC with 2.31 gears on my Cummins 6AT3.4 powered '67 FJ45 wagon).
Charlie

Memory lapse! Is it going to bolt directly between
a Chevy 350 bell housind and a LC 4 spd? or would this
require adapters?

It goes BEHIND the trans, not in front.
Charlie

Originally posted by Charles Aarons
It goes BEHIND the trans, not in front.
Charlie

:laughing: :laughing: Good One

there are couple that go in front of the tranny, like gear vendors and such. but i think the roughly doubled torque puts undo strain on the tranny wich is usually not as strong as a t-case. hmm lots to ponder. i just want a doubler between my cruiser 4 speed and case dammit, and make it long, 12-15" would be awsome.

7.05x3.44x2.31x4.11=229.9 too much is just enough! :D

Originally posted by r77toy
7.05x3.44x2.31x4.11=229.9 too much is just enough! :D



...HELL YA!!!!!...Any word on how soon for the 420 version???