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Unread 03-17-2003, 04:06 PM   #1
SirYoplait
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Join Date: Jan 2003
Location: Atlanta, GA
Posts: 24
4.10 or 4.56

Ok, thanks for everyone's help on my last post, I really appreciate it. Now I'm all revved up and ready to regear, but I'm trying to decide 4.10's or 4.56's. I know for hardcore offroading 4.56's would be better, but what about keeping a top speed of about 75 or 80? To quell any fears, yes, it actually goes 75 in 4th gear right now and the jeep is perfectly stable. Ideally, i'd like it to do so in 5th. I need to be able to zip around pretty well on the interstate, as that's unfortunately where alot of my driving is. I know, jeeps aren't made for high speed interstate driving, but I really haven't got another option.

Anyone got personal experience with the 4.10's/33's/258/T5 setup, or know how it would work out? I don't want to underpower my overdrive, but at the same time, i don't want it maxed out at 2700 rpm going 60 mph.

Maybe I'm just asking too much from my jeep, but it would seem to me that I should be able to work something out.

Either way, I appreciate the input I'm getting, and it's all helping.

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Unread 03-17-2003, 08:28 PM   #2
only in a jeep cj
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1986 CJ7 
 
Join Date: Jun 2001
Location: Mobile, Alabama
Posts: 4,098
check this page out:
http://www.gotjeep.net/gearatio.html

toward the bottom, it list 4.10's as best for street use with 33's

I know what you mean abou the speed. My Jeep sees 80 to 85 from time to time and it too is stable, but has stock springs, shackles, and 3.31 gears running 265 70 R15's in 5th.
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1975 CJ-6 304 T15 Dana20 30/44 3.73
1983 CJ-8 258 T5 300 30/44 3.31 Looking for full or half hardtop buy or trade
1986 CJ-7 Laredo 4.6 stroker T5 300 30/44 3.31
1986 TJ-7 Trail Jeep project in the works
2003 Inca Gold TJ Rubicon
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Unread 03-17-2003, 08:36 PM   #3
SamFromCO
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Join Date: Mar 2002
Location: Aurora, CO
Posts: 404
I ran 33's and 4.56 gears with a 258 and T5. The motor was running around 2800-3000 rpms @ 70 mph in fifth gear which wasn't too bad. 75 to 80 felt like it was pushing the motor a bit too much to me. For four wheeling, though, there are times when 4.56's seem too high. I've never wished that I had 4.10's but there have been times when I thought that 4.88's would be nice.
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Unread 03-18-2003, 09:34 AM   #4
BIGJMCCONNELL
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1977 CJ7 
 
Join Date: Feb 2003
Location: S. Toms River, NJ
Posts: 445
online calculators

Try this site.

www.4lo.com

You can just plug in your gearing and such and check your engine RPM or plug in RPM and get the ratio or whatever. There are plenty of these out there but this is the one I look at.

HTH

--BIGJ
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Unread 03-19-2003, 04:48 PM   #5
Chad Churchill
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Hi, well i have a 84 Cj7 with a 258..
when i first got her she had 4.10 and all i did was go out and get a lift and i put 33'' under her . But i have done alot more and i have a diff Tranny than you but my best friend was running 33'' with 4.10 and had a t5 but he was around 65 to 70 mph a little slower than mine but 70 is ok for a cj7 lol
Hope i could help you out some 4.10 is a great way to go..
Have fun with your jeep man...
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'84 AMC CJ7.. 4" rancho 9000 9 way+ 1'' Tow Shacks+ 1'' BD, 9,000 warn winch, 33''BFG mudd, T176,Danna 300 with Twin shifter,44 front,20rear,4.56 with locks, 258beefed, w. fuel injected!,MSD,new white paint, all new intr., and two onbord airs. Member of TMTC, member of offroadministry, and go 4x4ing all over the U.S.A.!!!
'98 TJ... 4" Teraflex with rancho 9000 9 ways. 33" all's with solid Axles and 4.56 with locks.. Hunter green and ready to go..
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Unread 03-19-2003, 07:31 PM   #6
SirYoplait
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Alright, 4.10 looks like the answer I needed.

How do I go about finding out exactly what gears are in it right now, aside from guessing my speed (speedo way off) and doing the math from the rpm's ?
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Unread 03-19-2003, 09:43 PM   #7
Chad Churchill
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Join Date: Feb 2003
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If it is all Stock, then it is 3. something like 3.76 i donno a guess, but like mine already had an up grade grearing did you buy the jeep new?? im sure you could have some one look at it for you for cheep...
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'84 AMC CJ7.. 4" rancho 9000 9 way+ 1'' Tow Shacks+ 1'' BD, 9,000 warn winch, 33''BFG mudd, T176,Danna 300 with Twin shifter,44 front,20rear,4.56 with locks, 258beefed, w. fuel injected!,MSD,new white paint, all new intr., and two onbord airs. Member of TMTC, member of offroadministry, and go 4x4ing all over the U.S.A.!!!
'98 TJ... 4" Teraflex with rancho 9000 9 ways. 33" all's with solid Axles and 4.56 with locks.. Hunter green and ready to go..
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Unread 03-19-2003, 09:59 PM   #8
SamFromCO
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Quote:
Originally posted by SirYoplait
How do I go about finding out exactly what gears are in it right now, aside from guessing my speed (speedo way off) and doing the math from the rpm's ?
You can raise both rear tires off the ground and count how many revolutions of the driveshaft that it takes to make the tires rotate one revolution.
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'86 CJ7, 258 w/Mopar MPI, 4.56 gears, rear Detroit/front Truetrac, full cage, OBA, 8274, 4" lift via Alcans/Rancho, 35's on beadlocks, other stuff. Built for rocks, mud is a four letter word.
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Unread 03-19-2003, 10:47 PM   #9
only in a jeep cj
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Location: Mobile, Alabama
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How do I go about finding out exactly what gears are in it right now..................
2 ways: Most of the time, the front diff tag is still in place. It will have the ring count and pinion count and/or the ratio as well on the lower right of the tag (I think). OR the next time the diff cover is off, spin the ring gear and on the side (between teeth and carrier) there will be the numbers. Divide the 2 for the current gearing.
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Ed

1975 CJ-6 304 T15 Dana20 30/44 3.73
1983 CJ-8 258 T5 300 30/44 3.31 Looking for full or half hardtop buy or trade
1986 CJ-7 Laredo 4.6 stroker T5 300 30/44 3.31
1986 TJ-7 Trail Jeep project in the works
2003 Inca Gold TJ Rubicon
only in a jeep cj is online now   Reply With Quote




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