Re-gearing for rear locker

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boerboel313

boerboel313

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Not sure what type of locker to use yet in the rear. Eaton, ARB, or a mechanical.
While that job is being done, should I re-gear the rear at the same time. They are currently the stock gearing so,what should I change them too? Does it matter that my 60 has a H55 tranny?
Thanks all.
 
Lokka to have some fun and money left for fuel.
If you go for bigger tires maybe re-gear, my big tires make shifting from 3 to 4 a bit rpm needed (not happy with cold engine)

But I dont know with Fj, they have double power :deadhorse:
 
now is the time to re-gear if you plan on running bigger tires at some point. The selection of the ratio to re-gear to is dependent on the tire size you plan to change to, which you did not state what size tire you plan to use. You always change the R&P in both the front and rear axle if you re-gear. You don't have to run as low of a gear with a automatic transmission as you would with a manual transmission to get similar impact...due to torque converter in the auto.

I think you may need to do some further research and explore what you want to use your truck for...etc GO to the clubhouse here on this board (see tab at top of this screen) and find the club section that is local to you or in the general area and meet up with some of the local guys in your area...might be well served to see what their real world experiences are.
 
The quickest and easiest re-gear you can do is swap in the third members from an FJ62. With 31 to 33 inch tires, it'll make your speedometer read accurately. You can do it yourself over a weekend without any special skills or tools, but if you're looking at larger tires, you'll probably want even taller gears set up by a professional. That'll involve more downtime and more $$.
 
Some research will let you know if you want to regear. Something to consider is with your locker choice. If your putting a mechanical like an aussie (which I have) or lockright then you can do this without pulling the 3rd out. You can just pull the cover off and install easily. So you could do this without affecting your gearing setup and possibly worry about your gearing later. If you do an ARB or other complete carrier replacement then you would need to setup your current ring and pinion or chose a new ratio. If you chose this route then you will also need to match your front, might as well throw a locker in there as well. 4.11s would be a good cruising ratio with a 33" tire. If your planning on more wheeling then I would consider 4.56.
 
IMO... stock 3:73 gears with a H55F and 31" tires are geared too tall. The engine is chronically out of it's torque range. A 4 speed with 31's is a good trade-off for freeway driving and other stuff, but once the 5 speed is installed... those 3:73s seem evil.

Remember that the stock sized tire on the 60 was a 28 incher...
 
If you're not going to spend a lot of time driving on snowy roads, I'd recommend Aussie locker or Lock-Right. I have used both brands and they work about identical. Best $300 you can spend for off-road performance, IMO. You can install it yourself in a few hours.

As for the re-gear, you haven't told us enough about what you're looking for. If you're sticking with your 32" tires, you probably don't need to (especially with the H55), but you might like the additional pep of 4.11 gears. If you're bumping up to 33" tires, you'll definitely like 4.11 gears, but still not strictly necessary. If you're bumping up to 35" tires, you'll want 4.56 or even 4.88 depending on intended usage.
 
An emence amount of great input.
I'm currently running 33x10.5x15 BFG A/T and a H55 tranny and stock gearing.
Most is pavement and the super highway with some wheeling in the mix. I will be however moving to 2600' in the shanandoha Mt's off the BR parkway so snow and Ice will be a factor.
I've chosen to go with a full ARB rear fitment kit to enclude compressor of course. At some point I can see maybe completing a SOS with 35" tires. so if that's the case,what gearing should I change too.Can I use 4.56 or 4.88 on the high way?
Thanks again for responding. Have a great 4th of July. I hope all will take the time to fly the RED WHITE and BLUE proudly. Everyone should be flying them regardless.
I fly 3 colors 24/7.
 
differential gear calculator.webp
 
I like 4.11 with 33 inch tires and 4.56 or 4.88 with 35 inch tires... 4.88 is a fairly low even with 35's as far a pavement driving, but I don't DD mine, also depends on OD ratio of the transmission.
 
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