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Old 07-04-2016, 07:00 PM
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RPM Recommendations

I have a 1993 YJ. I currently have a 2 inch shackle lift and run 33's. I have not revealed yet so as you can imagine this plays havoc with the engine on the interstate. The dummy shift light really is no help any more. My questions are:

1. How many RPM's do you allow prior to shifting? What is safe/dangerous
2. Is it ok to stay in 4th gear on the interstate at 2000-2500 RPM's?

Help please?

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Old 07-04-2016, 07:03 PM
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Originally Posted by tkdpal View Post
I have a 1993 YJ. I currently have a 2 inch shackle lift and run 33's. I have not revealed yet so as you can imagine this plays havoc with the engine on the interstate. The dummy shift light really is no help any more. My questions are:

1. How many RPM's do you allow prior to shifting? What is safe/dangerous
2. Is it ok to stay in 4th gear on the interstate at 2000-2500 RPM's?

Help please?
Sorry I meant I have not re-geared NOT revealed...haha stupid autocorrect

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Old 07-04-2016, 07:20 PM   #3
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You can run 2500rpm all day long. Won't hurt a thing. Much less than that and you'll lose your much needed torque

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Old 07-04-2016, 08:13 PM   #4
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What engine do you have? What is your current gear ratio? You might want to be able to use all 5 speeds, so you can get more torque up to that final gear. You basically have a 5 speed that's only useful as a 4 speed. You would want to regear the next gear ratio or two up. For example, I have the 2.5L running 30s on the stock 4.10 ratio. I want 35s, so I have 4.88 gears sitting in my garage waiting to be installed. 4.56 is the ratio between that, which is what I would recommend for 33s on a 2.5.

A good cruising RPM is around 2400-2600, but I cruise at 3100 else I won't get anywhere without 4th gear. You have a decent cruising RPM, but you want that in 5th gear...

I shift at 3-4k normally. If nobody is on the road, I'll shift a little slower. Hauling ass out of work at 5PM, I have to nearly redline it to avoid getting rear ended by the crazy SUVs getting their kids to practice.
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Old 07-04-2016, 11:03 PM
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What engine do you have? What is your current gear ratio? You might want to be able to use all 5 speeds, so you can get more torque up to that final gear. You basically have a 5 speed that's only useful as a 4 speed. You would want to regear the next gear ratio or two up. For example, I have the 2.5L running 30s on the stock 4.10 ratio. I want 35s, so I have 4.88 gears sitting in my garage waiting to be installed. 4.56 is the ratio between that, which is what I would recommend for 33s on a 2.5.

A good cruising RPM is around 2400-2600, but I cruise at 3100 else I won't get anywhere without 4th gear. You have a decent cruising RPM, but you want that in 5th gear...

I shift at 3-4k normally. If nobody is on the road, I'll shift a little slower. Hauling ass out of work at 5PM, I have to nearly redline it to avoid getting rear ended by the crazy SUVs getting their kids to practice.
I have the 4.0L. I can cruise at about 65 in 4th at 2100-2300 RPM's. I just want to make sure I'm not doing any damage. I assume my gear ratio is factory.
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Old 07-05-2016, 07:58 AM   #6
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I believe you have the 3.55 or 3.21 ratio factory. I'm not sure about the 4.0 Jeeps though. You're definitely not causing any damage, but you're not getting peak performance because you're wasting a gear. If you regear to 3.73 or 4.10 you'll get better torque and fuel efficiency.
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1999 Ford F-250 Super Duty 7.3L Powerstroke, single turbo, 6 speed manual.
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Old 07-05-2016, 08:53 AM   #7
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I have the same set up as you, your Jeep probably has the stock gearing at 3.07 just like mine. I never use 5th gear, not even on the highway. No problem so far. I just think of my Jeep as a 4 speed for now. Eventually I will re-gear to 4.10s.

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