4.7 or dual case

bignick

bignick

Fastest fat guy on two wheels....
Joined
May 23, 2005
Location
gas house
Trying to get a feel for what guys have had better luck with. doing single case with 4.7 or dual case. i know dual case invalves driftshaft mods. not looking for diffrences on that aspect. just performance and durability. I have a 87 yota with 5.29's spooled on 35's
 
To me the only way to go is with dual cases! Since alot of the time you will be mostly trail riding you can do it in single low and not over work your clutch in high range. then for those moments you need to crawl something grab double low. Wtih the 4.7 kit i found that you cant really trail ride in low range because your in such a low gear ratio and high range is hard on the clutch. This is just my opinion and what i have gone with in the past year and love it.
 
Get a 4.7 dual case. It's more expensive but in my opinion worth every penny. Way more options. When you need the ultimate in control for slow going, you can go double low, but when riding up mild hills and such regular low is good. In URE I use double low in just a couple of places but when I'm done with those places I look back and think well worth it.
 
I have a single 4.7 case and wish I would have gone with duals. But I do more webwheeling now so it dosent really matter.
 
Duels+4.7's is the ticket. If funds is issue, I'd do duels first, then 4.7's and twin stick the rear case.
 
Had a truck with duals 4.7 in the back case and 38's and never used the 4.7s that much. Ran stock duals on 38's for over a year now and find myself using double low 2nd gear the most.
 
Granted I had a Tacoma with the 2.7, so I guess it had slightly more power than a 22re, but I felt dual cases were PLENTY, I never felt the need for a lower gear, that was with 4.10's, and 39's.

I am building another Tacoma now with the 3.4, going to run a single gear driven case with 4.7's. It's being built to go 'fast', so hopefully it will do OK, I know I won't be going very fast in low range, but that's a sacrifice I am willing to take to save a bunch of $$$.

4.7's are cheaper if you only do one, because you don't have an adapter to buy, and you have no driveline modifications, BUT duals by themselves give you alot more options, and don't limit your speed as much in low range.

For a crawler/street truck, I'd go with dual's, w/o the 4.7's, if your motor is really weak, do duals and 4.7's...
 
I'm curious as to why the 4.7 in the rear case? Less torque transfer to the rear case? I did a 4.7 front case for simplicity's sake, as I already had the stock case so I just split it from the trans and bolted in the new case and bolted the old one to that.
 
My understanding is that a 4.7 in the rear case will put less stress on the rear case input shaft. If you put your 4.7 gears in the front case you should upgrade your input in the rear case to a 23 spline. This is what Marlin recommended to me and it worked well in my buggy with 39.5's.
 
Oh, well I guess I'll keep that spare case I've got laying around then, cause I didn't upgrade the rear case. We'll see how long it lasts.
 
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