4 low after regear

[damageinc321]

I have an 18 Rubicon 3.6 auto jlu with 38s and I regeared to 5.13s. The shifts in 2 wheel and 4 high feels good but 4 low seems to shift funny when wheeling. I don't have much experience with 4 low because I never really used it before but now I'm hitting obstacles where 4 low world be better but I'm a little hesitant because it feels like it's really shifting hard. Any insight would be great maybe I'm just not used to it just want some input. Thanks.

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[GATORB8]

Rolling it in neutral at a couple MPH during shifting helps.

 

[damageinc321]

Not what I meant, it goes into 4 low fine. I'm referring to shifting from 1st to 2nd to 3rd and so on. It hard shifts and feels like it holds gears too long maybe.

 

[GATORB8]

Not what I meant, it goes into 4 low fine. I'm referring to shifting from 1st to 2nd to 3rd and so on. It hard shifts and feels like it holds gears too long maybe.

Oh, 10-4. Same for us.

I only use it in Auto for speed. Obstacles M 1 or 2, Trail Riding M 3-5

 

[mwilk012]

Did you reprogram?

 

[damageinc321]

Did you reprogram?

Yes

 

[mwilk012]

Yes

That’s about all you can do then.

 

[Vinman]

You’re just feeling the lower gear ratio now, completely normal to have a bit more aggressive shifting in 4 low.

 

[grimmjeeper]

4 low changes the shift points in the transmission. You'll get used to it.

 

[AcesandEights]

Yeah, it's just how it works. You're multiplying the torque by four in four-low, so it's got an incredible amount of torque in comparison to two-wheel or four-wheel "high". Re-gearing increased the torque by another 25%, more or less,

 

[6.2Blazer]

It's normal for automatics to feel quite a bit different when in 4 low. The main reason is simply the torque multiplication of the 4 low gearing. 4 low on a non-Rubicon is almost 3 times lower overall gearing and a Rubicon it's typically 4 times. Plus on newer vehicles the ECU usually changes the shifting characteristics on top of that. If it shifts fine in 2 or 4 high I would fully expect how it's shifting in 4 low to be "normal".
On a side note when actually off-road on a trail (more than just wet grass or a snow covered road) I spend more time in 4 low. Any continuous slow speed driving over rough terrain or obstacles is just easier on the trans in low range.

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