what gears should i get? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep CJ Forum > what gears should i get?

*VOTE NOW Help Metalcloak Giveaway an XJ Suspension*Currie RockJock Products!!This is a shout out to all INTERNATIONAL Customers! Yes we

Reply
Unread 07-25-2013, 07:08 PM   #1
clmelt1
Registered User
1978 CJ5 
 
Join Date: Jan 2010
Location: beaumont, california
Posts: 41
what gears should i get?

i have a 78 cj5 with 33" tires, 304, t150 transmission. I have a wide track dana 44 and 30 that i want to put in my jeep. It is mostly used off road but i would like to be able to drive it on the street sometimes. I was wondering what gear ratio and brand everyone recommends, i think i need to replace the carrier too, also i am planning on putting a spartan locker in it. I was thinking 4.56 or 4.88 gears. thanks

clmelt1 is offline   Reply With Quote
Unread 07-25-2013, 09:36 PM   #2
Jeeper44mag
Registered User
1978 CJ7 
 
Join Date: May 2013
Location: Tampa, Florida
Posts: 159
With that combo, you'll be turning ~ 2550 rpm at 55 mph with 4.56 gearing (I should know... that's what I have) Doable, but sure not very good for lots of highway driving... however, if you're not planning on being on the road much.....

Luis
__________________
Had: '75CJ5 (back when they still made them), '76CJ7, '99 TJ.
Have: Metallic Silver '78 CJ7 Golden Eagle, 304 V8, ps., pb., A/C, ~3" Lift, 12.5"x33"x15 BFG AT's., T150/Dana20, Dana30/AMC20, 4.56 gearing, white hardtop.
Jeeper44mag is offline   Reply With Quote
Unread 07-25-2013, 10:57 PM   #3
Trapshooter
Registered User
1986 CJ7 
 
Join Date: Mar 2007
Location: Jacksonville, Oregon
Posts: 2,309
What are you running now? Are you looking to increase your tire size?

I have 4.10's with 33" M/Ts and do fine both off and on road.
__________________
'86 CJ7, 258, Carter BBD, Nutter'ed, TeamRush'ed, T-18, Twin Sticked Dana 300, D30 Frt-Pwr Lok L/S-4.10, AMC 20 Rear-Mosers-Detroit Locker-4.10, 2.5 BDS Lift, 1" Body Lift, 33" Wild Country M/Ts, Black Spoke wheels

'45 CJ2A, L134 Go Devil, T-90 Tranny, Warn O/D, T-18 T-Case, Dana 25 Frt, Dana 41 Rear, 531st CJ made

My 401 build: [url]http://www.jeepforum.com/forum/f8/trapshooters-401-build-1338277/[/url]
Trapshooter is offline   Reply With Quote
Unread 07-26-2013, 02:58 AM   #4
80cj
Web Wheeler
 
80cj's Avatar
1980 CJ5 
 
Join Date: May 2002
Location: Hawaii
Posts: 5,731
What ratio are the 44 and 30? Your s peed with only a 3:1 first gear is also a big limiting factor.
80cj is offline   Reply With Quote
Unread 07-26-2013, 08:13 AM   #5
clmelt1
Registered User
1978 CJ5 
 
Join Date: Jan 2010
Location: beaumont, california
Posts: 41
I think the 44 is 3.07 and the 30 is 3.11. Can't remember for sure. I do plan on eventually putting 35's on it and I would like to put a 4 speed in it, but those upgrades won't be for a few years. I maybe have 200 miles of freeway driving on it in the last few years.
clmelt1 is offline   Reply With Quote
Unread 07-26-2013, 04:04 PM   #6
LumpyGrits
Registered User
1985 CJ7 
 
Join Date: Jul 2010
Location: The Mojave Desert Palmdale Ca. U.S.A.
Posts: 4,409
With your final drive at 1:1(same with 3 sp or 4 sp bx). I would go 4:10's
I have a T-5 and the OD loves 4:88's, with my 33's.
LG
LumpyGrits is offline   Reply With Quote
Unread 07-26-2013, 04:40 PM   #7
jdarg
Registered User
2006 LJ Wrangler 
 
Join Date: Jan 2004
Posts: 625
I'd go 4.56 if you don't drive on the highway much, esp. if you have heavier 33's like swampers. Not all 33" tires take the same amount of power to get/keep moving so you need to consider that as well.
__________________
'94 YJ - SBC/AX15/231, SOA, 8.8, 34" swampers
'06 LJ Rubicon - 31" ATs, OME 2.5", belly-up skid, other junk
'75 CJ5 - 232/T14/D20, 'glass tub w/ 2" BL, otherwise stock
jdarg is offline   Reply With Quote
Unread 07-26-2013, 05:18 PM   #8
dg6772
Registered User
1986 CJ7 
 
Join Date: Feb 2011
Location: Muskegon, Michigan
Posts: 1,269
I have 33" Destination MTs with 4.10s and a 700R4. 50mph is 2,000 rpm, 70mph is about 2500rpm.

I'm not sure but I don't think you can put those gears in those carriers. I think the cut-off is 3.73; which means you would have to have 3.73 from factory to be able to put those lower gears in.

Dave in Muskegon
dg6772 is offline   Reply With Quote
Unread 07-26-2013, 06:49 PM   #9
clmelt1
Registered User
1978 CJ5 
 
Join Date: Jan 2010
Location: beaumont, california
Posts: 41
Thanks for all the advice. I figured I would have to buy new carriers with new gears. My tires are mud terrains. If I can go 65 mph on the freeway, that's fine with me.
clmelt1 is offline   Reply With Quote
Unread 07-27-2013, 12:49 AM   #10
LumpyGrits
Registered User
1985 CJ7 
 
Join Date: Jul 2010
Location: The Mojave Desert Palmdale Ca. U.S.A.
Posts: 4,409
Quote:
Originally Posted by dg6772 View Post
I have 33" Destination MTs with 4.10s and a 700R4. 50mph is 2,000 rpm, 70mph is about 2500rpm.

I'm not sure but I don't think you can put those gears in those carriers. I think the cut-off is 3.73; which means you would have to have 3.73 from factory to be able to put those lower gears in.

Dave in Muskegon
Did you correct your speedo after the gear/tire change?
LG
LumpyGrits is offline   Reply With Quote
Unread 07-27-2013, 12:55 AM   #11
LumpyGrits
Registered User
1985 CJ7 
 
Join Date: Jul 2010
Location: The Mojave Desert Palmdale Ca. U.S.A.
Posts: 4,409
Quote:
Originally Posted by jdarg View Post
I'd go 4.56 if you don't drive on the highway much, esp. if you have heavier 33's like swampers. Not all 33" tires take the same amount of power to get/keep moving so you need to consider that as well.
Dia is dia, and the rotational weight isn't that big a deal here.
Final drive ratio is. 1 to1. That's what you have without an OD, either manual or auto trans.
33' tire and 1 to 1 would be best served with 4:10 R&P.
LG
LumpyGrits is offline   Reply With Quote
Unread 07-27-2013, 12:58 AM   #12
dg6772
Registered User
1986 CJ7 
 
Join Date: Feb 2011
Location: Muskegon, Michigan
Posts: 1,269
I have not...yet. My speedo is only 5mph off, or so, according to my gps.

Dave in Muskegon
dg6772 is offline   Reply With Quote
Unread 07-27-2013, 09:05 AM   #13
clmelt1
Registered User
1978 CJ5 
 
Join Date: Jan 2010
Location: beaumont, california
Posts: 41
Are there any brands I should stay away from? Are there any you would recommend?
clmelt1 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.