FourBy4Toy

Ok, I am new to the dual case scene, I want to do a dual case in my 85 4runner (22re), I have had some conflicting info, and am a little confused, I have 2 top shift cases, and plan on doing a MC-07 Marlin Adaptor, however some people have told me dont do a dual case unless you use a 23 spline input shaft, is that on the front case?, the rear case, or both? I am only going to be running 35x12.5x15's, however I have elockers in front and rear. will 2 21 spline cases suffice for this setup do you think? I would think that if you used a 23 spline in the front that you would have to have a turbo tranny?

HELP!!!

Thanks

waskillywabbit

iTrader: (-1)

If you are going to build dual cases it is no more trouble to build the beefier 23 splines than it is the 21 splines...and no cost difference either.

Yes, the 23 splines are much stronger. Add a chromoly output shaft and some 4.7 gears and you are ready to crawl!!!

bruzer

And the 23 spline is supose to be much stronger.

JackKnife

Yeah, you can't use a 23 spline input with your current transmission. Nor would you need to. However, I think you may as well use a 23 spline for the the rear case. The upgrade will essentially be free if you are updating the rear case to a 4.0 or 4.7 gearset.

waskillywabbit

iTrader: (-1)

Yeah, what he said...I'm on codeine so don't believe anything I say tonight.

FourBy4Toy

yeah I am just going to do (2) 2.28 stock cases for now, I think that will be enough for me, so I think I get it now, just leave the front input shaft stock(as I have to unless I have a turbo 5speed), then put the 23 spline input in the rear, and go for the MC-07 23 spline kit?

waskillywabbit

iTrader: (-1)

If you are going to put in the 23 spline kit you are going to have to tear down the rear case anyway, do the 4.7 gears and do it once...and Marlin isn't the ONLY adapter out here.

http://www.wabfab.org/products/tcase/tcase.htm

FourBy4Toy

I see your point, well what is a good case doubler?, I have heard bad things about the AA kit, that the coupler can strip, and that the bearings are not as good?

FourBy4Toy

Inchworm, TrailGear? Also what if I just want to stick with stock 2.28's, do you think with just 35's I will be ok with a 21 spline doubler?, I really dont want to mess with tearing down the rear case, and spend more $$$ B.T.W., thank you all for the HELPFUL info!

tc

I don't see why you'd want 2 stock cases ... putting 4.7's in one gives you SO MANY more choices!

2x2.28 gives you:
2.28
5.2

1x4.7 + 1x2.28 gives you
2.28
4.7
10.7

FourBy4Toy

well for 1, I am not good at doing the mechanicals, as it is, I am going to have to pay someone to mate these for me, I can install them in my 4runner, but dont feel comfortable doing the internals, plus funds are tight, not sure if I can swing the 23 spline input, 4.7 gears, plus the extra labor to have the 2nd case torn apart?

FourBy4Toy

I see you are in Longmont too, do you offer services? lol

waskillywabbit

iTrader: (-1)

If you are going to wheel...start with the duals and build them yourself...not that hard if you can read and follow directions, have some patience and enough mechanical ability to brush your teeth.

FourBy4Toy

I have no patience HAHA, I think I have ADD too LOL

sschaefer3

And own a 20 ton press......

MudHippy

Oh, poo. I've done a complete over-haul on a Toyota VF1A chain-drive case, which is more complicated than a gear-drive. I didn't even need gear pullers, nor a press of any sort. Mechanically they are simple devices, with loose tolerances. So you can't hardly mess them up, even if you forget to add the gear oil when your done. If I can do it, you can do it. I'm no genius, though I play one on Yotatech. People sometimes forget: heat is your friend when you don't own a press.

sschaefer3

You have to press the main output shaft off the big gear to put the 4.7 big gear on.

Getting that snap ring off and not loosing the little ball is not easier either.

The out of the ordinary tools are a 20 ton press and a very large snap ring pliers, not the typical auto parts store type, the really big ones.

MudHippy

Hot plate or baked in a conventional oven, old tricks. I also use my bernzomatic propane torch for some things too. Get things hot they slide right together/apart. I don't own snap-ring pliers either. Nice, but not needed. I lost track of one of those little balls your talkin' about, luckily the local hardware store sells loose ball bearings of similar size.

AxleIke

I am in boulder, and have done a full 4.7 gear swap. I have quite a bit of experience, and it took me 12 full hours.

21 spline will be fine in your truck, but when i say that, i assume you still have a stock 22re.

23 spline will be better. It will come down to what ever you decide to do.

I am with the rest of these guys, and advise you do it once, and do it right.

If you decide to go with the set up you have described, 2 stock cases, 21 spline, you will be okay, just remember that the extra gearing means more torque, so take it easy on the skinny pedal. It is much harder to break the 23 spline set up, but if you are careful, you shouldn't have issues with the 21 spline.

tc

I have a garage and a lot of tools ... no press, but there is a Napa, Autozone, Advance, and Checker within about 2 miles of my house.

If you want to do it, I'd be happy to help out. Maybe Isaac can come over and shed the light of previous experience on it...