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General Forums => The Mess Hall => Topic started by: RT on November 23, 2011, 10:05:47 AM
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Should I go with 4.56 or 4.88 gears. My 4.10s handle the 285s I'm running just fine it's just that my ring-pinion-and bearings in my rear axle are damaged and what's the point of building it back if your not going to build it back better? I'm on the highway quite a lot and don't want to max out under 80 but I'd appreciate a bit more grunt up hills. Opinions?
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4.88 :driving:
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The question is are you going to stick with 285's?
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around that size, i'm not sure I'd ever want to go smaller and I'm not going more than a couple inches larger
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If you might go bigger, go with the 4.88s.
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go with 4.88's. I have run stock size tires with them even and it wasn't bad. loads of of line power :D surprised a few people lol
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Don't waste your time and money with such a small change as 4.56 gears. Go 4.88, you'll be glad you did.
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Don't waste your time and money with such a small change as 4.56 gears. Go 4.88, you'll be glad you did.
:thumb:
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I have 456 in mine mostly cause one of my axles already had them but I wish I had 488 but ill waIt and go to 513 now when I decide on a front axle conversion, just can't decide what front I want
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I have 4.56 and in hind site would have done 4.88's.
I was one of the fools who tried to make a D35 last...
You could not get 4.88's in a D35 back then, now I have a D44.
Dave
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around that size, i'm not sure I'd ever want to go smaller and I'm not going more than a couple inches larger
Are those 285R70's or R75's? The difference is one's 30.7" while the other is 31.8". If you're going to go with 33's then go with 4.88's. If they're 30.7's and you're going to stick with them then, I'm not sure if I'd bother regearing at all.
Also, if you ever wanted to go smaller, you're SOL.
Here's a cool interactive gear, tire, speed & rpm chart - http://vexer.com/automotive-tools/speed-rpm-calculator
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Why not get a Dana 44 or Ford 8.8 and upgrade to 4.88 at the same time? Then you will really be building it back better. Sticking with the D35 you are just spending money and building back the same (actually weaker since 4.88 gears are weaker than 4.10).
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Should I go with 4.56 or 4.88 gears. My 4.10s handle the 285s I'm running just fine it's just that my ring-pinion-and bearings in my rear axle are damaged and what's the point of building it back if your not going to build it back better? I'm on the highway quite a lot and don't want to max out under 80 but I'd appreciate a bit more grunt up hills. Opinions?
You can go 80 mph now with 4.10s? Holy shit, I have 4.56 with 31's and the only time I see 80 is if it's a 50% downhill grade with the wind behind me! Of course mine's an automatic with a .69 OD ratio that sucks monkey balls but that's another story.
As for gears . . . I've never read a post on one of these forums where someone said they wished they went with 4.56 instead of 4.88 . . . it's always the other way around. Good luck.
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I managed 89 once on the Alvord lakebed with a tail wind and 2 miles of acceleration....
Running 32" highway tires , 4 cyl stock(At the time) and 2 of us in the rig... Hit the Aero wall and it stopped accelerating.
Not going to Bonneville with it except as a spectator.... LOL
Dave
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You can go 80 mph now with 4.10s? Holy shit, I have 4.56 with 31's and the only time I see 80 is if it's a 50% downhill grade with the wind behind me! Of course mine's an automatic with a .69 OD ratio that sucks monkey balls but that's another story.
As for gears . . . I've never read a post on one of these forums where someone said they wished they went with 4.56 instead of 4.88 . . . it's always the other way around. Good luck.
I've hit 79 wth 35's shooting down HWy15 to I5 and again coming down from the Grapevine into the central valley. With so little extra power a swift breeze could drop you 5-7MPH in an instant. I hated how unstable the Jeep felt though. it was vert twitchy at that speed and you really had to be on the ball. I'd rather gear my Jeep for a reasonable 75MPH top end.
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I must be lucky cause with 31.5 I can hit 80 on flat ground. Now it does take me a while But I can. since the Highest speed here in Oregon is 65 Most times I run 70. Takes a steep hill to slow it down and most times I still do not need to down shift before I reach the top. And I'm running stock 4.10.
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I must be lucky cause with 31.5 I can hit 80 on flat ground. Now it does take me a while But I can. since the Highest speed here in Oregon is 65 Most times I run 70. Takes a steep hill to slow it down and most times I still do not need to down shift before I reach the top. And I'm running stock 4.10.
That's still pretty close to stock tires. 31's are rarely 31" tall. Most AT's are well under. Around 30.3-5". MT's are usualyl 30.5-7".
If there's no wind and it's flat, I can probably get up to 80mph but it would take a long runup. Once the gears kick in, I can usually hold 80 as long as I don't have to slow down. Slow down and if there is a heavy wind and or small hills and I can't get back to 80. Long run down hills is a lot easier but like I said, it gets sketchy with a tall Jeep.
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I must be lucky cause with 31.5 I can hit 80 on flat ground. Now it does take me a while But I can. since the Highest speed here in Oregon is 65 Most times I run 70. Takes a steep hill to slow it down and most times I still do not need to down shift before I reach the top. And I'm running stock 4.10.
my jeep would be a rocket on 31's with 4.88's
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my jeep would be a rocket on 31's with 4.88's
When I ran that combo, I could hold 80mph on the FL turnpike no problem (5th gear with cruise control on holdingn the speed steady)
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When I ran that combo, I could hold 80mph on the FL turnpike no problem (5th gear with cruise control on holdingn the speed steady)
Wow, you guys don't know good you have it. My 3rd gear is 1 to 1 then od is .69 ... Might as well shift it into reverse! :wall:
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Wow, you guys don't know good you have it.
Well, me being a Jeeper, I could not leave well enough alone, so I went to 33's and lost that.. Of course, i gained more offroadability, but I had to sacrifice this.
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I picked a D44 rear out of a rubicon to put my 95 YJ. It has 5.13s .
Need to decide what to do up front. Been told 5.13s an D30 is a bad idea. Pinion way too small (weak).
I plan on running 32" TSL radials.
Should I swap out the front axel and keep the 5.13s.
Our build up the D30 with4.88s and change to D44 to match ?
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With 32s, 4.88 should work very well. But if you plan to go to 35's, a front D44 and 5.13s would be a great setup.
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If there's no wind and it's flat, I can probably get up to 80mph but it would take a long runup. Once the gears kick in, I can usually hold 80 as long as I don't have to slow down. Slow down and if there is a heavy wind and or small hills and I can't get back to 80. Long run down hills is a lot easier but like I said, it gets sketchy with a tall Jeep.
reading all these posts went for it this morning on the hwy, got up to 85mph and it seemed to be able to go more, had to let off as there was traffic ahead of me and also my tires are way out of balance, once i get over 110kph (65mph) you can really feel them so need to take care of that first. I want 35s but I am really concerned to lose whatever pep she's got now.
EDIT: not sure if there was wind or not but (didn't feel there was) but to be honest a realistic test would be to go both ways and average the result, even a 5 mph wind makes a difference with the wide/tall tires and jeep lifted 5 inches.
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x2. after the 50mm tb swap my jeep (4:10 31's tbi) can do 80 all day on the freeway if its fairly flat. it does hit a aerodynamic wall at about 88mph though.. but no need to go that fast in a jeep anyways. I wonder if some people aren't factoring in the amount the speedometer is off with bigger tires without changing the speedo gear.
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I wonder if some people aren't factoring in the amount the speedometer is off with bigger tires without changing the speedo gear.
some people don't but it's been repeated here lots of times so eventually they figure it out.
did my gas mileage, first 200 km (120 mi) i got 18L/100km which is 13.1mpg, did it again today and got 16.34L/100km or 14.5mpg - I could probably get 15 but i doubt i can get any better than that, possibly in the summer since will get to temp quicker but not sure how much difference that would be (with 4.88 seems a bit better than with 4.10 as i was always in the 13mpg range before swapping the gears)
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with 4.88 seems a bit better than with 4.10 as i was always in the 13mpg range before swapping the gears
When I swapped from 4.10 to 4.88, I also gained about 1 mpg... But then I lost about 1.5 when I went from 31's to 33's! :blbl:
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With the jumps between gears in a manual tranny it is hard to say what gearing in the diffs will be better. For highway use, you might hit a sweet spot dead on with 4.56 diff gears in 4th gear and you might end up with neither 4th nor 5th being as good with 4.88 in the diffs. To really optimize your setup, you would need to do some real world testing and some math.
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I used my GPS for getting the speed... I never have trusted the speedometer on the jeep ... :)
dave