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Unread 11-10-2007, 09:58 PM   #1
chuckwag
Registered User
1981 CJ5 
 
Join Date: Sep 2007
Location: maine
Posts: 64
no clue on gearing

well i'am just about finished with my cj5, i mounted 31's on it and the engine was redone and bored 30 over w/new pistons and cam. the gearing is 2.73 and by what i've read so far i think i will need to regear it. and i may put a locker or similar item in the front and back.

i need advice on this, and we do get alot of ice and snow.

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Unread 11-10-2007, 10:13 PM   #2
thantos858
Web Wheeler
1974 CJ5 
 
Join Date: Jan 2005
Location: Santa Maria
Posts: 1,572
4.10 would be a good start for that size. It all depends on engine and what you want to do with it. If you can tell us that it would be a lot more help.
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Unread 11-10-2007, 10:38 PM   #3
chuckwag
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1981 CJ5 
 
Join Date: Sep 2007
Location: maine
Posts: 64
well for the next year or so i'll be running alot of country roads, highway and let the new paint job get a few nicks before i take it up to northern maine trails and up into the woods in canada.

the jeep has a t176 and dana 300, and has a complete rebuilt to it everything is new mostly redone with nos parts about 95 percent of it.
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Unread 11-10-2007, 11:21 PM   #4
thantos858
Web Wheeler
1974 CJ5 
 
Join Date: Jan 2005
Location: Santa Maria
Posts: 1,572
I think the 4.10s like I said before would be good for that kind of driving. I dont remember the site but theres a chart where it shows gears for tire size. Are you going to be going up in tire size in the future also? Might as well upgrade it all the way now so you dont spend 2-3 times the cost over its lifetime.
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Unread 11-10-2007, 11:28 PM   #5
OldSailor
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1977 CJ7 
 
Join Date: Sep 2007
Location: Livonia, Michigan
Posts: 858
If it's primarily a daily driver, even in snow and ice, and it will only occasionally be used off-road, I'd think 3.73 gears would be fine with those 31" tires. If you're going to do a fair amount of off-roading and not a lot of freeway driving, then 4.10 gears would probably be the better choice.

If you're going to drive on ice a lot, I'd suggest opting for a selectible locker, rather than an auto locker. Auto lockers can sometimes get you going sideways on ice, especially on off-camber roads.
__________________
1977 CJ7, AMC360 V8 w/ headers, DUI HEI, Edelbrock intake, Holley 4150 carb, , TF999, D300, D30 front and AMC20 rear with 4.56 gears and lockers both ends, 4" susp lift, 2.5" body lift, 35" BFGs, ARG steering, 8000-lb winch, etc.
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Unread 11-11-2007, 06:51 AM   #6
spk454
Senior Member
1983 CJ8 
 
Join Date: Aug 2007
Location: Maryland
Posts: 670
http://www.novak-adapt.com/knowledge/gearing.htm

these are great calculators, let you calculate crawl ratios and highway rpm's at any desired highway speed based on tranny/transfer case final drive ratios (1 and 1 in your case ) t-case low range ( 2.62 for dana 300 (stock)) and tire size...
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Unread 11-11-2007, 09:26 AM   #7
jeepdaddy2000
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1971 CJ5 
 
Join Date: Jan 2002
Location: Secret Squirrel hideout, afghanistan
Posts: 6,271
A four speed with 3.73's and 31's will do nicely on the road. Look to an LS such as the Powr Lok or True Track (Steer clear of the Trac Lok)for a traction device. Invisible and more than adequate for what you are going to be doing.
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