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post #1 of 14 Old 08-24-2013, 05:42 AM Thread Starter
toprope1
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1984 CJ7 
 
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thinking of the best

1984 cj7 what engine and auto tran. best fits this jeep? budget7K 258 3 speed

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post #2 of 14 Old 08-24-2013, 05:56 AM
wellmax
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1984 CJ7 
 
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Location: Hazel, KY
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I would say the 6 cylinder,

I have a 1984 jeep with the 4 cylinder 150 engine.
it can hardly get out of it own way, no speed demon.

but, its a good jeep and I like it, it goes plenty fast on the highway with the front end as squirrely as an old worn out jeep frontend can be.

good luck with your jeep.
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post #3 of 14 Old 08-24-2013, 07:10 AM
Jeeper44mag
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1978 CJ7 
 
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What engine does it have now?

Luis

'78 CJ7, 304, ps, pb, A/C, ~3" Lift, 12.5"x33" MTZ's., T150/D20, D30/AMC20, 4.56.
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post #4 of 14 Old 08-26-2013, 10:46 AM Thread Starter
toprope1
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big 6

think the 6 is good go browns!
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post #5 of 14 Old 08-26-2013, 11:27 AM
only in a jeep cj
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Quote:
Originally Posted by toprope1 View Post
1984 cj7 what engine and auto tran. best fits this jeep? budget7K 258 3 speed
Engines: 4cyl:150,151
6cyl: 232, 258, and the later 4.0
8cyl: 304, 360, 401
Auto transmissions: 904, 999, TH 400, 727

All " fit " in a 84 CJ7 with ease

Other non oem options will fit with mounts and adaptors.
It's all down to what you want

Ed
1975 CJ-6 1983 CJ-8
1986 CJ-7 Laredo 1986 TJ-7 Trail Jeep
2003 Inca Gold TJ Rubicon
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post #6 of 14 Old 08-26-2013, 11:43 AM
WindKnot
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1977 CJ7 
 
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I think it all depends on what you want to do with it. Jeeps aren't race cars but some guys want to make them into one.

It's YOUR Jeep, but if it was me and for what I do, if your 258 is healthy I'd consider just putting fuel injection on it. That does away with carburetor and choke adjustments. It might even help fuel economy.

Do you have a manual or automatic transmission? If it's a manual transmission, Jeep didn't put it there. The T-150 was the last three speed manual transmission Jeep used and they dropped it in in 1978, I believe. I have it in my Jeep and the only disappointment for me is that it doesn't have an overdrive. Third gear is 1:1.

I think the standard automatic transmission was a three speed TorqueFlite. That's an old war horse with a good reputation. For me, if it was working right, I'd keep it.

I'd rather be lost on the trails than found at home!

Phoenix Rising- A Flame Off Restoration? http://www.jeepforum.com/forum/f8/ph...ation-1807257/
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post #7 of 14 Old 08-26-2013, 11:56 AM
LeePrather
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Quote:
Originally Posted by only in a jeep cj

Engines: 4cyl:150,151
6cyl: 232, 258, and the later 4.0
8cyl: 304, 360, 401
Auto transmissions: 904, 999, TH 400, 727

All " fit " in a 84 CJ7 with ease

Other non oem options will fit with mounts and adaptors.
It's all down to what you want
I wouldn't look at the 401 really though. They might run over that budget. People think a lot of them ($$$$$$) and there are a lot of hidden costs with engines. The 360 would probably be the biggest engine for you to stay under 7k if you do everything right. Ignition module, coil, plug wires, carb, gaskets, head clean up and replace some components (think oil pump)...
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post #8 of 14 Old 08-26-2013, 12:31 PM
jeepwhore
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Quote:
Originally Posted by WindKnot View Post
.......Do you have a manual or automatic transmission? If it's a manual transmission, Jeep didn't put it there. The T-150 was the last manual transmission Jeep used and they dropped it in in 1978, I believe. I have it in my Jeep and the only disappointment for me is that it doesn't have an overdrive. Third gear is 1:1.

I think the standard automatic transmission was a three speed TorqueFlite. That's an old war horse with a good reputation. For me, if it was working right, I'd keep it.
T150 was the last manual? Definitely not. The SR4, T4, T5, T176/177 all came in CJ's at some time between '80 an '86.

As for what's best? Who's to say? I love the 258 and am replacing mine with another only with a 4L head and FI this time. As for transmissions, I'm going with an AX15 to gain O/D and a hydraulic clutch.

'84 CJ-7: Yota axles (spartan locked front, e-locked rear) 4" BDS, 1" Daystar & 3/8" shackle lifts, 35" X-Terrains on steelies, YJ Tub & family roll bar, heater blower upgrade, 4.2L w/MC2100 & Team Rush, Warn 8274. Rebuilt 4.2/4.0 hybrid, AX15 and twin sticks/clocking ring waiting to go in.

The advertised position for a topless, dirty jeep girl has been filled......by my wife. Thanks to all that applied.
<------------and yes, that is her.
:-D
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post #9 of 14 Old 08-26-2013, 01:16 PM
WindKnot
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Whoops! the T-150 was the last three speed manual transmission. Good catch.

I will now go back and edit my post so that others behind us will have no idea of what we're talking about and I will look knowledgeable on the subject!

I'd rather be lost on the trails than found at home!

Phoenix Rising- A Flame Off Restoration? http://www.jeepforum.com/forum/f8/ph...ation-1807257/
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post #10 of 14 Old 08-26-2013, 04:29 PM
jeepwhore
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Quote:
Originally Posted by WindKnot View Post
Whoops! the T-150 was the last three speed manual transmission. Good catch.

I will now go back and edit my post so that others behind us will have no idea of what we're talking about and I will look knowledgeable on the subject!



'84 CJ-7: Yota axles (spartan locked front, e-locked rear) 4" BDS, 1" Daystar & 3/8" shackle lifts, 35" X-Terrains on steelies, YJ Tub & family roll bar, heater blower upgrade, 4.2L w/MC2100 & Team Rush, Warn 8274. Rebuilt 4.2/4.0 hybrid, AX15 and twin sticks/clocking ring waiting to go in.

The advertised position for a topless, dirty jeep girl has been filled......by my wife. Thanks to all that applied.
<------------and yes, that is her.
:-D
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post #11 of 14 Old 08-26-2013, 07:31 PM
petey156
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Don't forget the amc 390. Commonly over looked by the jeep crowd,,, FYI. All amc v-8 are interchangeable with regards to outer physical size, Engine mounts, and bell housing bolt pattern.
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post #12 of 14 Old 08-26-2013, 11:34 PM
BagusJeep
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1981 CJ7 
 
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Yep, no doubt all those AMC engines will be the "best fit".

You have 7k so plenty of room there to get any of those to work. My preference would be a later 4.0HO with a 4 speed auto, fuel injected and smooth and long lived without being too heavy or thirsty and based on the AMC six so the lineage is there.

If you go to the Novak Transmissions website they have a lot of knowledge about engine and transmission swaps into CJs.

BagusJeep lives in Bali.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE
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post #13 of 14 Old 08-27-2013, 09:39 AM
holliewood61
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I did a 304/th400/d20 out of a commando so I could have a strong auto and a selectable t-case without dropping a chunk of change an an AA or Novak kit
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post #14 of 14 Old 08-27-2013, 09:55 AM Thread Starter
toprope1
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Location: wellington
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i'm all in

thinking 3 speed shifter is straight no overdrive 258 single carb bought 2150 for 7$ need intake man. and ex. man
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