- Thread starter
- #21
Is the rockbox a 4.7 case? Is it available?
Its an old AA product. 3.44 low. Not in production anymore which makes parts hard to find. I'm kind of apprehensive about it, but it's a good price, and most likely rebuildable.
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
Is the rockbox a 4.7 case? Is it available?
So is there one available? I'm typically apprehensive about a driveline component that's no longer in production.Its an old AA product. 3.44 low. Not in production anymore which makes parts hard to find. I'm kind of apprehensive about it, but it's a good price, and most likely rebuildable.
So is there one available? I'm typically apprehensive about a driveline component that's no longer in production.
My experience on the Rubicon in an FJ40 with ~60:1(SM465, lc case and 4.11 gears) with 35s showed me it wasn't quite deep enough. My ride-along with exact same rig but the doubler showed it to work well.(Both V8s)
I would avoid ANY NP203 based doubler like the plague. They add a TON of slop to the drivetrain. The shifter in my experience has problems staying in gear(two different rigs) I swapped out an NP203 to a plain split case behind an NV4500.
I was interested in putin in a rock box years ago when they were the thing to do and then the Toy box was there .i went with the Toy box it works good enough for me . Alec had his before me and he's good with it, his 4 speed is a SM420 and mine is a 4 speed out of a 87' FJ60.
Really wish @Marlin Crawler would produce the toy box again or at least do group orders of them. 100% would have gone that way instead of the 4:1 gears in my splitcase. I’ll still only be at 68:1 even with 4:1 gears where as a toy box would have yielded 152:1...
I feel the same way. For basically the same price, you get a lot more options with better reductions.
Not likely. I’m into my 4:1 gears for $1300 with a fully rebuilt tcase and a few other odds and ends. I bet a toy box would be $2500.
I mean, the taco box kit is $999.00.
Not to mention driveshaft mods, cross member mods/additions, spacial constraints, etc. A crawlbox, toybox or not, is way way way more expensive than low range gears.
Can you adapt your NV4500 to a NP203, then use this in front of your current 16 spline case?
50-8802 : Toyota Land Cruiser/NP203 Doubler (for 16 spline transfer cases) | Advance Adapters
Advance Adapter This adapter kit will adapt the reduction housing of the GM NP203 to a Land Cruiser 16 spline transfer case. The adapter length is 1.525” in length and is made from 356 T-6 heat treated aluminum alloy. The adapter kit includes an adapti...www.advanceadapters.com
Ok.... I've reached a point where I don't believe that the seller of this Rockbox is willing to really sell, so I'm back to looking at options.
A toybox seems like it would be pretty simple to do. It would need custom adapters, but I think that could be figured out. My problem is that I cannot find an NV4500 to 21/23 spline tcase adapters. It looks like AA used to make one, but not anymore. Do you guys think that this is worth the time to look at seriously doing?
Doesn't make sense when a black box exists.