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post #16 of 36 Old 08-24-2011, 05:45 PM
Tom95YJ
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I had 4.88 gears and 33" tires on Both my TJ and YJ I was able to drive 75mph with no issues at all using 5th gear . 4.88's will not limit your top speed they will make up for the diference in tire height 4.88 & 33" tire is like the factory 4:10 gearing with a 28" tall tire. IMO 4.56' would be a waste of money since your only going down 1 ratio and it would still be undergeared


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post #17 of 36 Old 08-24-2011, 08:49 PM Thread Starter
Vin91
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I have stock 4.10 s now an it like a slug lol
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post #18 of 36 Old 08-24-2011, 08:51 PM Thread Starter
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Quote:
Originally Posted by Tom95YJ
I had 4.88 gears and 33" tires on Both my TJ and YJ I was able to drive 75mph with no issues at all using 5th gear . 4.88's will not limit your top speed they will make up for the diference in tire height 4.88 & 33" tire is like the factory 4:10 gearing with a 28" tall tire. IMO 4.56' would be a waste of money since your only going down 1 ratio and it would still be undergeared
I'm going to be running 35s you don't think it's going to effect it much?
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post #19 of 36 Old 08-24-2011, 08:58 PM
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Quote:
Originally Posted by Vin91 View Post
I'm going to be running 35s you don't think it's going to effect it much?


You WILL notice a change in gas mileage when going from stock tires to 35's no matter the gearing. The gearing will help to get some of the power back. But you're turning a much heavier tire, so that in itself will effect mileage. 35's are heavy. Going from a 31" tire to a 33 will add a few pounds per tire, but going from a 33 to a 35 will add A LOT of weight. Even though it's only a couple inches taller the bigger tires are built much heavier and will take a lot more power to turn. The extra weight also helps break stuff once you get off road. That's why I chose to go with 33's.

And nobody has mentioned it yet, but you should also be aware that 35's on the D35 rear end is a setup for disaster unless you're mostly just doing street driving. And I wold never regear a D35. It's not worth the money.

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post #20 of 36 Old 08-24-2011, 11:22 PM
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[
And nobody has mentioned it yet, but you should also be aware that 35's on the D35 rear end is a setup for disaster unless you're mostly just doing street driving. And I wold never regear a D35. It's not worth the money.[/QUOTE]

Nobody has mentioned it because he said in his first post he had the 8.8
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post #21 of 36 Old 08-25-2011, 05:52 AM
mrmark
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I have a 2.5 with a D35 and 4.88's and a detroit locker running 35's. I will tell you I have plenty of bottom end power (well I could use an extra 100 hp )

I have no problem getting up to 55 mph, however it is usually a struggle to get to 60 and I almost never see 65 (my speedo is off by 2 mph now so you would need to add that in)

My gas milage is about 12 mpg depending on how i drive it.

As for RPM I can get about 2100 -2300 in 5th gear, occasionally it'll rev up a bit higher on a good highway run but it's lost as soon as I hit a hill.

Now with that said, I read this forum daily, and I am not getting the milage and speed that everyone else seems to get (with similar setups) or they are just plain lying about their Jeep's performance to look like they have something special. I don't know which is the case but I am telling you exact facts about mine.
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post #22 of 36 Old 08-25-2011, 06:13 AM
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dont forget the 8.8 needs a slight modification to run 4.88s in it... you have you shave off some of the teeth in order to get c clip shaft back in
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post #23 of 36 Old 08-25-2011, 06:22 AM
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got any video of that?
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post #24 of 36 Old 08-25-2011, 08:18 AM
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Quote:
Originally Posted by jrhdpaintball View Post
dont forget the 8.8 needs a slight modification to run 4.88s in it... you have you shave off some of the teeth in order to get c clip shaft back in
Or eliminate the c clips.

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post #25 of 36 Old 08-25-2011, 09:24 AM
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Originally Posted by Vin91 View Post
Ok so i am looking to re-gear im running 35s with a 4 banger, i have d30 up front an 8.8 rear? Can i run 4.56?
Why did you put a (?) after 8.8 rear? Are you unsure you have a 8.8?

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post #26 of 36 Old 08-25-2011, 10:13 AM
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I run 4.88's with 35's and the 6 cylinder, I could easily have done 4.56's but don't think I'd do that with the 4, I would definitely do 4.88's.

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post #27 of 36 Old 08-25-2011, 12:16 PM
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Originally Posted by timatoe View Post
I run 4.88's with 35's and the 6 cylinder, I could easily have done 4.56's but don't think I'd do that with the 4, I would definitely do 4.88's.
And I run 4.10 with 35's and would strongly recommend going to 4.88 with two fewer cylinders than I have. It just depends on what you use the jeep for, Dana 44's hold 5.13 gears nicely...

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post #28 of 36 Old 08-25-2011, 09:03 PM
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got any video of that?
Yes, the video is of me playing around, the jumping is in the end


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post #29 of 36 Old 08-26-2011, 10:42 AM
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Go with the 4:88.

Im running 11.5-32-15 MTs with a 4cyl and 4:88. It now drives like it did with the stock tires. I can pull 75 on most freewayss @ 3100 rpm, rarely have to downshift on a freeway / highway to hold speed at or above 65 mph. Gas milage is 14 -16 mpg.

It is still a slug and you need room to accelerate up to 65 + but its not terrible. Off road in low range with the 4:88 it has plenty of power.

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post #30 of 36 Old 08-26-2011, 11:53 AM
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Quote:
Originally Posted by Vin91 View Post
Right now i top out at like 50 on a good day with 410s. Thats what me spedo says
You're doing closer to 70mph. To give you an idea, with 31" tires, you are off 1mph for every 10mph (so 10mph = 11mph, 20mph = 22mph, 60mph = 66mph) with the 4.10 gears.

So you are actually close to 70. If you want to be able to use ANY of that engines power, then go to 4.88 gears. It will put it close to the factory gearing ratio that was used with the factory tires. And don't think for a minute that it won't scoot around. I'm basically all back to factory tire size now, and I can move on the freeway at 70mph easily. That is actual MPH, not off MPH. If I want to, I can push to 75mph and keep it there. Going up long freeway inclines I need to downshift to 4th gear, but it can hold 68ish. With 4 people, 65ish.

Max speed is in the low 80's. I don't bother going there, because that's breaking the law.

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