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01-25-2008, 03:26 PM
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#1
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Registered User
Join Date: Mar 2006
Location: Mundelein, IL
Posts: 204
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any one running 4.88s in a hp30? pros and cons? personal experience with em? any input would help me decide between 4.88s and 4.56s
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1998 Zj, 4.0, 242(231/300 doubler in the process), HP60, shaved 14B, 5.38s, locked F&R, full hydro, Rusty's LA with 7in springs and ACOS, bilstein 5125 shocks, jks bar pin eliminators, jks upper shock conversions, no rear sway bar, 44in gumbos, jks discos, walmart ligh bar, cobra cd, kor radiator support, rhino lined interior, homemade winch mount, 9k winch
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01-25-2008, 04:06 PM
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#2
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Registered User
Join Date: Apr 2007
Location: Wilsonville, Oregon
Posts: 5,354
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since the hp 30 is an XJ axel i would try this in the XJ forums. i know theres a dude running a hp30 in a ZJ but i cant remember who it is.
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1993 Jeep ZJ. 4.0
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01-25-2008, 04:08 PM
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#3
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zj tractor
Join Date: Jun 2007
Location: southern afganistan
Posts: 5,224
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its also in the YJs, so post there too.
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hard working private first class in the United States Marine Corps.
Quote:
Originally Posted by shift_grind
It's threads like this that make me wonder why people lift there jeeps
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its comments like this that make me wonder why some people are jerks.
build thread: http://www.jeepforum.com/forum/f197/...ndard-1056365/
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01-25-2008, 04:16 PM
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#4
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Mr. Hyde!
Join Date: Mar 2005
Location: Boulder, CO
Posts: 22,865
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The lower the gear ratio, the weaker the pinion gear gets. 4.88's on the 30 pinion is pushing it IMHO.
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'04 WJ, 6" Clayton LA's, 242 SYE, 35" BFG MT KM2's, 4.56 gears, & D44a locked
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01-25-2008, 04:21 PM
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#5
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zj tractor
Join Date: Jun 2007
Location: southern afganistan
Posts: 5,224
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yea, arlo is right, if i recall correctly, 4:56's have 11 teeth on the pinion and the 4:88's have 9 teeth.
i cant imagine how much weaker 4:56's or 4:88's are than my 4:11's...... i stripped the gears smooth when i boke them in my D30LP.
__________________
hard working private first class in the United States Marine Corps.
Quote:
Originally Posted by shift_grind
It's threads like this that make me wonder why people lift there jeeps
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its comments like this that make me wonder why some people are jerks.
build thread: http://www.jeepforum.com/forum/f197/...ndard-1056365/
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01-25-2008, 04:41 PM
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#6
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Registered User
Join Date: Jan 2006
Location: Santa Fe, New Mexico
Posts: 7,103
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4.56s I wouldn't hesitate to run, but like 5.9Andy said, the 4.88s only have 9 teeth on the pinion gear.....that's asking for trouble IMHO.
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01-25-2008, 04:54 PM
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#7
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Mr. Hyde!
Join Date: Mar 2005
Location: Boulder, CO
Posts: 22,865
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Updated your sig Andy - although now it is getting a bit long 
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'04 WJ, 6" Clayton LA's, 242 SYE, 35" BFG MT KM2's, 4.56 gears, & D44a locked
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01-25-2008, 08:33 PM
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#8
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Registered User
Join Date: Mar 2006
Location: San Diego/Imperial Beach
Posts: 809
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I run 4.88's in a LP 30 and have no problems yet. I'm running 35's. HP D30 are stronger.
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01-25-2008, 09:20 PM
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#9
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JEEP FREAK
Join Date: Apr 2004
Location: , Southeast MI
Posts: 21,997
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The strength difference, if any, is not an issue.
Many people run 4.88s in D30s without any problems with the pinion gear.
If you do have a problem, it will be because of a bad install or a faulty gear set.
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01-25-2008, 09:33 PM
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#10
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Registered User
Join Date: Apr 2006
Location: Powder Springs, Georgia/University of Tennessee
Posts: 2,356
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What size tires? If a 35" or 33", get 4.56. If larger then 35", I would probaly go with 4.88.
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Ben
1993 Jeep Grand Wagoneer ZJ V8: Rear Aussie, 3.5" Lift, 31" M/Ts
GA Trail Riders
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01-26-2008, 01:21 AM
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#11
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Registered User
Join Date: Dec 2001
Location: Denver, Colorado
Posts: 2,049
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Well, the real ? & piont is. What are you going to run in the rear?
The sig says a 35. Are you staying with it or going to something bigger?
Personaly I would never run 4:56's & 33" or bigger in a 35. I know Hunters has been OK but most do not & those that have, have broken pretty quick.
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ZJ 98 5.9 LTD. Lots of mods. 7" T&T's Long Arm Lift ,BFG KM2"s,35X12.50x16's,4:56's, Vanco brake upgrade, M1intake,Holley52mmTB,MikeLeach Headers,, Arb'ed HP D30,Aussie Locked rear,Procomp MX6 Shocks,Arb front,RearTR bumpers,ECT.ECT.
Latest Pics
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01-26-2008, 10:50 AM
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#12
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Registered User
Join Date: Mar 2006
Location: Mundelein, IL
Posts: 204
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Quote:
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Originally Posted by Colorado 5.9
Well, the real ? & piont is. What are you going to run in the rear?
The sig says a 35. Are you staying with it or going to something bigger?
Personaly I would never run 4:56's & 33" or bigger in a 35. I know Hunters has been OK but most do not & those that have, have broken pretty quick.
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I am goin to be running an Hp30 out of my old cherokee and an 8.8 rear. I will be going to a 36in tire at the biggest if that but for now im going to be runnin 34in ltbs. Ive been runnin them for quiet some time and i drive my jeep pretty had and still have the 35 in the rear and it hasnt failed me yet. My final axle set up will be an 8.8 rear and an Hp30 front with a 36in tire max if that. So from that im wondering which would be better 4.56 or 4.88 with no bigger than a 36in max and ill maybe never even go bigger than a 35in tire
__________________
1998 Zj, 4.0, 242(231/300 doubler in the process), HP60, shaved 14B, 5.38s, locked F&R, full hydro, Rusty's LA with 7in springs and ACOS, bilstein 5125 shocks, jks bar pin eliminators, jks upper shock conversions, no rear sway bar, 44in gumbos, jks discos, walmart ligh bar, cobra cd, kor radiator support, rhino lined interior, homemade winch mount, 9k winch
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01-26-2008, 11:34 AM
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#13
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Jeep Jedi Master
Join Date: Mar 2003
Location: Omaha, NE
Posts: 19,613
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If you haven't regeared and go to 4.56s from stock, you'll think you're in a prerunner
Hunter
__________________
94 5.9 Laredo 6.5 RE lift with 35 Maxxis Bighorns
and 33 Bridgestone Duelers
Detroit and true trac
Red Jeep Club Member
REDNECK JCM
Texas Jeep Owner #6
USN Jeep Club #4
http://www.kevinsoffroad.com/
602.841.3355
For your performance needs:
kolak@kolakperformance.com
480.998.3661
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01-27-2008, 08:19 AM
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#14
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JEEP FREAK
Join Date: Apr 2004
Location: , Southeast MI
Posts: 21,997
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Quote:
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Originally Posted by 5.9 ANDY
yea, arlo is right, if i recall correctly, 4:56's have 11 teeth on the pinion and the 4:88's have 9 teeth.
i cant imagine how much weaker 4:56's or 4:88's are than my 4:11's...... i stripped the gears smooth when i boke them in my D30LP.
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Quote:
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Originally Posted by ajmorell
4.56s I wouldn't hesitate to run, but like 5.9Andy said, the 4.88s only have 9 teeth on the pinion gear.....that's asking for trouble IMHO.
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Just because the pinion gear has fewer teeth does not necessarily mean its weaker.
Tooth count is not the important factor. The tooth surface contact area, or the tooth overlap area, is the more important factor.
Sometimes a lower ratio gear set is stronger even though it will have fewer teeth.
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01-27-2008, 11:05 AM
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#15
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Registered User
Join Date: Jul 2004
Location: Raleigh NC
Posts: 3,027
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PumaZJ has been running 4.88's in his hp30 and 8.8 for as long as i can remember and he beats the snot of them with no issues I know of.
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4.88s in hp30
