Default What Gear Ratio to run 

Old 11-06-2018, 10:31 PM   #1
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Ive got a 79 Cj7, 360 with 3speed, spring over and 35's. Im wondering what the best gear ratio would be to use in the differentials. I only drive the jeep to the trail and do general 4wheeling, a little of everything on the trails. So driving to and from the trail with general trail riding. Thank you for any advice!

 

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Default Re: What Gear Ratio to run 

Old 11-07-2018, 06:55 AM   #2
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How much highway and at what speeds?

I also have a 360 & 35s and the T18 4 speed is like a 3 speed on the street. I run 4.10s but even with the granny gear, I added a 2.46 low range to transfer case to help out on the tail. If you are going to keep the 3 speed, then I would look at either 4.56s or 4.88s. 4.56s should put you around 2700-2800 rpm @ 60 mph and 4.88 would be around 9
2900-3000 rpm. If you have the AMC20 then I think 4.88 is as low as you can go.
And if you plan on any serious off roading, then I would also plan on going with a 3.15 low range to help out.

But having been there and done that myself, IMO you'll be much better off in the long run to swap transmissions.


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Default Re: What Gear Ratio to run 

Old 11-07-2018, 09:29 AM   #3
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What are you running currently, stock 3.54 or optional 4.10?
I would first swap out the T150 for a T18 then address the gears depending on the type of trails you run.
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Default Re: What Gear Ratio to run 

Old 11-07-2018, 04:51 PM   #4
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With 35's-Look at 4:56.
You really need to think about a 4 or 5 speed tranny.
If you went to a 5 speed-Then 4:88 would be a better choice.
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Default Re: What Gear Ratio to run 

Old 11-07-2018, 07:19 PM   #5
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I'm running 4.88s with 35" tires. I wouldn't want to go down the highway without overdrive. Even tho these little 6 cylinders will turn up a lot more than we give them credit for, I still don't like to run them at a high rpm. I guess I'm old.

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Default Re: What Gear Ratio to run 

Old 11-07-2018, 11:03 PM   #6
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Quote:
Originally Posted by caveman View Post
I'm running 4.88s with 35" tires. I wouldn't want to go down the highway without overdrive. Even tho these little 6 cylinders will turn up a lot more than we give them credit for, I still don't like to run them at a high rpm. I guess I'm old.

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What trans do you have and do you drive it on the street or just trailer it?

 

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Default Re: What Gear Ratio to run 

Old 11-08-2018, 09:45 AM   #7
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I drive it on the street often. If I go offroading and know it's going to be rough I trailer it in case it breaks. The wife and I are touring the U.S. presently and I'm trailering it to save wear and tear. It's also our git around buggy while on the road. I presently have the AW4 automatic transmission replacing an AX15 that was there before. This old fat body of mine doesn't bounce like it used to and creeping over an obstacle is more to my style.

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Default Re: What Gear Ratio to run 

Old 11-08-2018, 08:32 PM   #8
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Quote:
Originally Posted by caveman View Post
I drive it on the street often. If I go offroading and know it's going to be rough I trailer it in case it breaks. The wife and I are touring the U.S. presently and I'm trailering it to save wear and tear. It's also our git around buggy while on the road. I presently have the AW4 automatic transmission replacing an AX15 that was there before. This old fat body of mine doesn't bounce like it used to and creeping over an obstacle is more to my style.

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I plan on swapping a automatic in maybe 6 months.. you think 4.56s or 4.88s for now and later?

 

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Default Re: What Gear Ratio to run 

Old 11-08-2018, 09:29 PM   #9
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Originally Posted by wooderson64 View Post
I plan on swapping a automatic in maybe 6 months.. you think 4.56s or 4.88s for now and later?
I went with the 4.88s because I do some rough offroading from time to time and not usually in a hurry when I take the Jeep down the road. If you're going to do mostly offroading the 4.88s might be what you want. Otherwise I would go with the 4.56s. It will still be very capable with 4.56s with an automatic.

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Default Re: What Gear Ratio to run 

Old 11-09-2018, 09:51 AM   #10
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Quote:
Originally Posted by wooderson64 View Post
I plan on swapping a automatic in maybe 6 months.. you think 4.56s or 4.88s for now and later?
That would have been good info disclose up front...

What auto do you plan to run, and with what transfer case?

 

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