what gears should i get? - JeepForum.com

 
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post #1 of 13 Old 07-25-2013, 08:08 PM Thread Starter
clmelt1
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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

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post #2 of 13 Old 07-25-2013, 10:36 PM
Jeeper44mag
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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

Black '05 LJ, soft top, ~4" lift, 42rle, 3.73, 35"x12.5" AT's, Tampa FL area
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post #3 of 13 Old 07-25-2013, 11:57 PM
Trapshooter
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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

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post #4 of 13 Old 07-26-2013, 03:58 AM
80cj
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What ratio are the 44 and 30? Your s peed with only a 3:1 first gear is also a big limiting factor.
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post #5 of 13 Old 07-26-2013, 09:13 AM Thread Starter
clmelt1
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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.
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post #6 of 13 Old 07-26-2013, 05:04 PM
LumpyGrits
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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
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post #7 of 13 Old 07-26-2013, 05:40 PM
jdarg
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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
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post #8 of 13 Old 07-26-2013, 06:18 PM
dg6772
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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
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post #9 of 13 Old 07-26-2013, 07:49 PM Thread Starter
clmelt1
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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.
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post #10 of 13 Old 07-27-2013, 01:49 AM
LumpyGrits
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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
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post #11 of 13 Old 07-27-2013, 01:55 AM
LumpyGrits
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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
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post #12 of 13 Old 07-27-2013, 01:58 AM
dg6772
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I have not...yet. My speedo is only 5mph off, or so, according to my gps.

Dave in Muskegon
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post #13 of 13 Old 07-27-2013, 10:05 AM Thread Starter
clmelt1
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Are there any brands I should stay away from? Are there any you would recommend?
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