What gear ratio to go with?

OscarMike2.0

OscarMike2.0

New member
I will be placing my order from Dynatrac in 20 days or less and I am still undecided on what gear ratio I want to run. The axles will be a pr44 and pr60 with arb. I spend about 45% on the highway 45% and that other 10% on the trails. I have 37s and dont plan to go bigger. Ive limited it down to 4.56, 4.88, and 5.13. If you could tell me what ratio you have and how you like it that would be great. Thanks
 
D

Dzandersen

New member
I've had 4.56 with bfg 37s on my last rig and it worked out well on and off the road. Fair mpgs (18 or so) on the highway and plenty of wheel spinning torque off road unless it's a primarily off road vehicle I wouldn't go much higher.
 
13_gecko_rubi

13_gecko_rubi

Caught the Bug
I have 4.88s in pr44/pr60 in my 13 jk on 37s. 5.13s would have given me a little more pickup but my 4.88s have been great and it doesn't hunt for gears cruising at 75+ mph. If I had to choose again I'd do same. That said in in Michigan and it's kind of flat but I picked 4.88 to help FE because it's my dd
 
13_gecko_rubi

13_gecko_rubi

Caught the Bug
This was main reason. Rpms high enough for me
 

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bkac

bkac

Caught the Bug
If nitto doesn't hurry up I'll be running 5.38s and 35's. No highway trips for me!
 
13_gecko_rubi

13_gecko_rubi

Caught the Bug
I drive stock ones a lot. Id say it slightly less peppy than my 4.10s stock were but some of that is my heavy ass toyo 37s too. Lots of weight to get rolling. I think 4.56 it would hunt for gears a lot. Esp at 80, I'm on borderline. It will drop to 4th on hills. Back when I had 4.10s it would drop to 3rd. I'd say 4.88 or 5.13 would be choices. Just depends if you want to run 3500+ @ 80 or not. Maybe someone could post up a shot that has 5.13s for you. I know lots do.

I'm assuming you have the 3.6 auto right? If not ignore everything I've said lol
 
OscarMike2.0

OscarMike2.0

New member
13_gecko_rubi said:
I drive stock ones a lot. Id say it slightly less peppy than my 4.10s stock were but some of that is my heavy ass toyo 37s too. Lots of weight to get rolling. I think 4.56 it would hunt for gears a lot. Esp at 80, I'm on borderline. It will drop to 4th on hills. Back when I had 4.10s it would drop to 3rd. I'd say 4.88 or 5.13 would be choices. Just depends if you want to run 3500+ @ 80 or not. Maybe someone could post up a shot that has 5.13s for you. I know lots do.

I'm assuming you have the 3.6 auto right? If not ignore everything I've said lol
Click to expand...

Lol yah I have the penstar. Thanks for all the info. I hope someone will post up what they run 80 at with 5.13s
 
Static83

Static83

New member
I had the same question not long ago. Most people said go 5.13's. My jeep is my DD, and I thought it would be to much. I went with 4.88 and glad I did. Its perfect for getting up to speed, and holds 70-80 with no problem. I hit 3k RPM at 78. Highway MPG is not very good though at around 14 at 75.
 
kpig

kpig

Member
Running heavy 37" Toyos on Slabs with 4.56s. Just drove from Louisiana to Florida and back and the auto trans kept shifting into 3rd gear every time I hit a grade. It was annoying driving 80 mph in 3rd gear at over 5k rpms. My fuel economy averaged only 14mpg. I'm doing an axle swap now to Prorock60 rear with 5.38s. It will be a bit high but will still be driveable until I move up in tire size. There is another post from Eddie on recommending 5.13 for Rubicat, and ORE is running 5.38s on Evolander, both on 37s. I figured I can't go wrong. Good luck.
 
MIZZOURA

MIZZOURA

New member
I'm running 5.38s in pr60s front and rear w/ 37s on an 07 4 door automatic. 80mph she holds 3200 rpm. Great choice of axles!
 
wayoflife

wayoflife

Administrator
Staff member
kpig said:
Running heavy 37" Toyos on Slabs with 4.56s. Just drove from Louisiana to Florida and back and the auto trans kept shifting into 3rd gear every time I hit a grade. It was annoying driving 80 mph in 3rd gear at over 5k rpms. My fuel economy averaged only 14mpg. I'm doing an axle swap now to Prorock60 rear with 5.38s. It will be a bit high but will still be driveable until I move up in tire size. There is another post from Eddie on recommending 5.13 for Rubicat, and ORE is running 5.38s on Evolander, both on 37s. I figured I can't go wrong. Good luck.
Click to expand...

To be clear, we were running 5.13's in Rubicat but recently had a set of 5.38's installed. Running 37's, I wish we hadn't made the switch and were running 5.13's again.
 
bkac

bkac

Caught the Bug
wayoflife said:
To be clear, we were running 5.13's in Rubicat but recently had a set of 5.38's installed. Running 37's, I wish we hadn't made the switch and were running 5.13's again.
Click to expand...

But now you can run those badass 40's with 20's on Rubicat!
 
kpig

kpig

Member
MIZZOURA said:
I'm running 5.38s in pr60s front and rear w/ 37s on an 07 4 door automatic. 80mph she holds 3200 rpm. Great choice of axles!
Click to expand...

Thanks, you too. :) Now if I can just afford the front to match. Waiting for the shop to finish regearing the front.

To the OP: even with the 4:1 transfer case, I found it difficult to modulate the throttle in 4 low with the 4.56s. 5.13s probably would have been ideal for 37s with the3.6 auto, but I couldn't pass up the deal on the ProRock 60 already geared 5.38.
 
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