i have a dual stock case set up right now. My question is I spend most of my time in low low 2nd or 3rd gear . If I put a 4.7rear gear set in what will I run to be about the same gearing?

 

The same gearing? No, because you've added a different ratio into the case.

Will you be using different spots in the tranny? Yes.

 

I meant what gear on trans will I be in . I am just considering this swap. I have been in situations where I could use lower gears to crawl. I am running a tired 22re on a 86 4runner with dual stock cases and 5.29diffs and 39.50 pit bulls . I am normally in 3 rd gear on the trails I run now and it works great,but I am wondering if the 4.7 in the rear case is beneficial or not. I can't really run to many trails in high 4wd so if I do the 4.7 will I be able to select maybe high front low rear and get the same gear combo I have now?

 

One of my favorite mods I ever performed was putting 4.7's in my single case behind my 22R-E on 35's. Instead of running in first and second, I was third and fourth.

So, yes.

 

But if you want to be in 2nd or 3rd just use the 4.7 case and leave the 2.28 in N

You don't have to engage both cases

 

: What!! Seriously ! I never thought of That! I have had my duals for a couple of years and didn't know you could do that . Sweet! Thanks!

 

You currently have two 2.28 case. Both engaged equals about a single 4.7 case
Currently you can do 2.28 or 2.28 and 2.28
If you make your current second case to a 4.7.
Than you can engage 2.28, or 4.7 or 2.28 and 4.7

 

You want the 4.7 gear set in the rear case

 

Thanks ! That's what I wanted to know. I don't really ever drive with just 4hi , I always am either in 2 hi or double low . I have the occasion every so often to use front hi rear low or the other way, but not much . It just never occurred to me to put the front case in neutral . I have looked at the install guide for the 4.7s and it doesn't look to bad. Any hints or advice.

 

Never dont a 4.7 set. I think you have to clearance your case a little to install. Other than that clean work space and follow instructions. Find videos online if any

 

4.7 tcase conversions are very easy. TG or MC have good online instructions.

You will need access to a bearing press.

Also, get a really good set of snap ring pliers. Not cheap crap. It will only frustrate you. Or else you'll punch babies and kick puppies.

Go slow with the grinder.

You'll have to take the tcase COMPLETELY apart to do this, so stay organized and spread out the pieces on the floor on cardboard. That way you can mark it.

Done yet?

 

Yea 4.7's are easy to do and is hands down one of the best upgrades to your drivetrain IMO other then lockers. Since your already dualed your 4.7's in the rear will be nice and double low is rediculous after you get 4.7's you'll only really ever need to run the front case if your crawling big rocks.

 

This doesn't make sense to me. Either the front case is in High (1:1) or Low (2.28 reduction). N is in the middle and won't pass power through.

If you run 2 x 2.28 stock cases....and you are engaged in H in the front case (1:1)...and engaged in Low in the rear case....then it's like running only a standard single 2.28 case in that scenario....like a stock truck.

Actually the way I understand it, you can vice versa that and it's the same result ratio wise, only difference being it's safer to engage 2.28 in the rear case first because you don't compromise the strength of the input shaft of the rear case. (engaging only the rear case in Low is safer than engaging the front case in Low and leaving the rear case in High).

.

 

Your exactly right but most people referring to leaving the front case in neutral just mean not engaging it since if its in neutral no power is being moved pass that point! And never run the front case by its self only doubled or rear case!

 

Gotcha

with my duals and 4.7s there's a lot of combos to pick...

and I do run just the front case engaged in 2.28 w/ the rear in high sometimes...got me the 23 spline adapters/4.7's for the insurance...

 

what you want to do is:

23 spline 4.7 in rear case with rear case twin sticked.

you have way more options and wont have to worry about breaking the stock 21 spline input.
I have broken one, it sucks lol

 

21 or 23 spline same price but do it all at once.

23 spline 4.7 gears, 23 spline dual cases, twin stick and chromoly output

:wabbit2:

 

But since he already has duals I'm sure he already just has the 21 spline so I doubt he'll upgrade to 23 spline.

 

Why not? A 23 spline coupler IIRC is around $100. And is only an extra hour to change. Well worth the time and effort if you ask me