What gear ratio should I install in my Jeep Wrangler TJ / LJ? (and other re-gearing FAQs)

Space Naught said:
I have 3.07 gearing (I know, they suck) but will be looking at new tires soon and really like the look of 31s. I mainly drive a very boring flat highway for 90% of my driving, Should I look at regearing to 3.73\4.10 just to have peace of mind?

I probably will never go larger than 33s with these axles, but when the mind decides for bigger, I'll just do brand new axles rather than building a super30/35.

The other important junk:
4.0 w/ 32RH
Dana 30/Dana 35 w/ 3.07 gears
Click to expand...

Highway or freeway? What speed?

My 32rh/3.73/31's tj was comfortable at 50 mph. Any faster and i was just wasting fuel.

Why don't you like the 3.07's?
 
Rickyd said:
Highway or freeway? What speed?

My 32rh/3.73/31's tj was comfortable at 50 mph. Any faster and i was just wasting fuel.

Why don't you like the 3.07's?
Click to expand...

Whoops, Fell asleep and the website was down thanks to Cloudflare.

The 3.07 just seem slow overall, main highways/freeways near me are 65-75mph and it lugs to get up to speed, definitely when it goes from stand still to wide open during 5 PM traffic.

Back roads are 40-50 mph depending on the part of town. I have no problem lifting from a stop or maintaining speed there.

My real end goal for my current situation would be 31/10.25R15s and a 2in lift without feeling like a boat anchor. It already sorta feels like one with the 235/75R15s that are on it right now when at highway speeds, takes a bit to pony up to the speed limit unless I absolutely stomp on the skinny pedal.
 
  • Like
Reactions: Rickyd
Space Naught said:
Whoops, Fell asleep and the website was down thanks to Cloudflare.

The 3.07 just seem slow overall, main highways/freeways near me are 65-75mph and it lugs to get up to speed, definitely when it goes from stand still to wide open during 5 PM traffic.

Back roads are 40-50 mph depending on the part of town. I have no problem lifting from a stop or maintaining speed there.

My real end goal for my current situation would be 31/10.25R15s and a 2in lift without feeling like a boat anchor. It already sorta feels like one with the 235/75R15s that are on it right now when at highway speeds, takes a bit to pony up to the speed limit unless I absolutely stomp on the skinny pedal.
Click to expand...

3.73 and 31s chirp the tires a bit stomping it off the line and felt fine for power at speed.peppy little jeep. Its the top end rev i don't like. Without an overdrive you'll need to compromise one way or another. Maybe 3.55?
 
Rickyd said:
3.73 and 31s chirp the tires a bit stomping it off the line and felt fine for power at speed.peppy little jeep. Its the top end rev i don't like. Without an overdrive you'll need to compromise one way or another. Maybe 3.55?
Click to expand...

Maybe 3.55 but if I do regear, id probably just go full on 4.10 or deeper and lockers. Or pray and find someone getting rid of their D44s.

@hear lmk when you decide to toss 1tons under that jeep 🤣
 
  • Like
Reactions: Rickyd
Space Naught said:
I have 3.07 gearing (I know, they suck) but will be looking at new tires soon and really like the look of 31s. I mainly drive a very boring flat highway for 90% of my driving, Should I look at regearing to 3.73\4.10 just to have peace of mind?

I probably will never go larger than 33s with these axles, but when the mind decides for bigger, I'll just do brand new axles rather than building a super30/35.

The other important junk:
4.0 w/ 32RH
Dana 30/Dana 35 w/ 3.07 gears
Click to expand...

If you plan to use 3.73, just buy used axles with this ratio. I sold my dana35/30 combo for 600$ couple to years ago.
 
  • Like
Reactions: Rickyd
Top Bottom