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Unread 04-03-2013, 08:42 PM   #1
emt1236
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Best manual transmission for a 258 CJ7

I have a 1978 CJ7. I am in the process of rebuilding completely. I am at the point if having to decide on the transmission. I know I would like something that is streetable and useful off-road. I want durability. What is the best available. I prefer a 5 speed or 6. I am anxious to hear your opinions.

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Unread 04-03-2013, 11:43 PM   #2
titomars
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for a 258 in a CJ and needs to be a 5 spd, that's easy............... AX15
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I don't worry about my MPG's. I see it as the price of admission...............Damn what a ride!!!
---------------------------------------------------------------------------
**Originally Posted by wm69 **
This is the kinda whiny crap I would expect to see in the JK forum. We drive rough riding, leaking, gas guzzling CJ's. Rattle can it and throw it in your Jeep.
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1981 Jeep CJ7 258 4.0 HO head, T-5, D300, D30, D44, SOA
1994 Jeep XJ 4.0 HO, AX-15 (My Beater)
1946 Bantam T3-C (original Calif trailer, no rust)
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Unread 04-04-2013, 12:24 AM   #3
BagusJeep
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Look up the Novak transmission website, lots of good free info from experts.
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Unread 04-04-2013, 12:51 AM   #4
82JeepCJ7
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5-speed= NV4500. Anything else is a door stop.
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Unread 04-04-2013, 02:08 AM   #5
adams1985cj
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Quote:
Originally Posted by 82JeepCJ7
5-speed= NV4500. Anything else is a door stop.
Agreed I've been running mine for a long time with zero issues.
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Unread 04-04-2013, 07:18 AM   #6
NoNative
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Quote:
Originally Posted by titomars View Post
for a 258 in a CJ and needs to be a 5 spd, that's easy............... AX15
Ditto this. I just completed this swap earlier this year. Huge fan. Same performance as the 176 1st thru 4th, but the overdrive gear is greatness.
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1986 CJ-7 Laredo, 258, AX15, AC Dana 30/44, Ox Lockers, Howell TBI, DUI, 4.5" RE YJ Springs, 1.25" BL, clocked & twin-sticked Dana 300 with Lomax 4-1, 4.10s, 33s, PB, 8000# winch, YJ Roll Bar, Factory 20 gallon tank.

1984 CJ-7 Renegade, 258, T4, AC, Howell TBI, DUI, 2.5" OME YJ Springs, 3.53, 31s, PB, Warn bumpers & 8000# winch, Factory 20 gallon tank

1984 CJ-7 Renegade, 258, Auto, AC, 3.31s, PB, Factory 20 gallon tank, Bone stock except for 31s
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Unread 04-04-2013, 08:12 AM   #7
mastercraftka
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I have a T5, i know i know! So do either one, NV4500 or the AX 15 bolt right up? Any drive shaft mods?
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Unread 04-04-2013, 08:50 AM   #8
NoNative
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Not sure about the NV4500, but to install the AX-15 you'll need to buy a clocking ring, a new bellhousing, new external clutch master cylinder (mounts by the power brake booster), modify the clutch pedal, and modify the tranny mount on the skid plate. Check out novak's website for parts, pricing and how to do it.
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1986 CJ-7 Laredo, 258, AX15, AC Dana 30/44, Ox Lockers, Howell TBI, DUI, 4.5" RE YJ Springs, 1.25" BL, clocked & twin-sticked Dana 300 with Lomax 4-1, 4.10s, 33s, PB, 8000# winch, YJ Roll Bar, Factory 20 gallon tank.

1984 CJ-7 Renegade, 258, T4, AC, Howell TBI, DUI, 2.5" OME YJ Springs, 3.53, 31s, PB, Warn bumpers & 8000# winch, Factory 20 gallon tank

1984 CJ-7 Renegade, 258, Auto, AC, 3.31s, PB, Factory 20 gallon tank, Bone stock except for 31s
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Unread 04-04-2013, 02:07 PM   #9
titomars
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Quote:
Originally Posted by 82JeepCJ7 View Post
5-speed= NV4500. Anything else is a door stop.
Not all of us can afford the extreme prices of the NV4500.
__________________
I don't worry about my MPG's. I see it as the price of admission...............Damn what a ride!!!
---------------------------------------------------------------------------
**Originally Posted by wm69 **
This is the kinda whiny crap I would expect to see in the JK forum. We drive rough riding, leaking, gas guzzling CJ's. Rattle can it and throw it in your Jeep.
---------------------------------------------------------------------------
1981 Jeep CJ7 258 4.0 HO head, T-5, D300, D30, D44, SOA
1994 Jeep XJ 4.0 HO, AX-15 (My Beater)
1946 Bantam T3-C (original Calif trailer, no rust)
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Unread 04-04-2013, 04:19 PM   #10
82JeepCJ7
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If you buy it from a company like Novak or AA, then yes, they can be expensive. If you buy a used transmission and swap it in yourself, it is much cheaper.
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Unread 04-04-2013, 05:07 PM   #11
titomars
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Quote:
Originally Posted by 82JeepCJ7 View Post
If you buy it from a company like Novak or AA, then yes, they can be expensive. If you buy a used transmission and swap it in yourself, it is much cheaper.
What is much cheaper? the lowest I have seen a used NV4500 in my neck of the woods is about 2k. For the 3k+ it would take to get it in and working, I would rather see my CJ painted. For that matter maybe a new tub
I am running a perfectly working T-5. I have never had a problem with it. I rebuilt it when I first got the CJ. In the past I used to drag race on T-5's there is nothing wrong with them behind moderate HP engines. An AX-15 is a much better trans and it's cheap to swap over. I have a fresh AX-15 in storage to swap into mine when the time is right. And before you say it, Yes I take my CJ off road alot. I just am not a rock crawler or deep mudder.
__________________
I don't worry about my MPG's. I see it as the price of admission...............Damn what a ride!!!
---------------------------------------------------------------------------
**Originally Posted by wm69 **
This is the kinda whiny crap I would expect to see in the JK forum. We drive rough riding, leaking, gas guzzling CJ's. Rattle can it and throw it in your Jeep.
---------------------------------------------------------------------------
1981 Jeep CJ7 258 4.0 HO head, T-5, D300, D30, D44, SOA
1994 Jeep XJ 4.0 HO, AX-15 (My Beater)
1946 Bantam T3-C (original Calif trailer, no rust)
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Unread 04-04-2013, 05:10 PM   #12
82JeepCJ7
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I passed on one the other day for $500. Craigslist is your friend.
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Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
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Unread 04-04-2013, 05:22 PM   #13
titomars
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Quote:
Originally Posted by 82JeepCJ7 View Post
I passed on one the other day for $500. Craigslist is your friend.
Yeah C/L in the SF bay area must not be so friendly. That's where I saw one for $1,900.00. I'd be scared to even ask any wreckers here
__________________
I don't worry about my MPG's. I see it as the price of admission...............Damn what a ride!!!
---------------------------------------------------------------------------
**Originally Posted by wm69 **
This is the kinda whiny crap I would expect to see in the JK forum. We drive rough riding, leaking, gas guzzling CJ's. Rattle can it and throw it in your Jeep.
---------------------------------------------------------------------------
1981 Jeep CJ7 258 4.0 HO head, T-5, D300, D30, D44, SOA
1994 Jeep XJ 4.0 HO, AX-15 (My Beater)
1946 Bantam T3-C (original Calif trailer, no rust)
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Unread 04-04-2013, 05:29 PM   #14
WNC-84CJ7
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http://greenville.craigslist.org/pts/3720610464.html
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Unread 04-04-2013, 05:49 PM   #15
CSP
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The OP didn't say anything about cheap or best bang for the buck. Just the "best", which in a 5spd would be the NV4500.
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