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Old 09-02-2012, 06:54 PM   #1
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Our "new" CJ5.....

So we just picked up a 76(ish) CJ5 with a full fiberglass body. Frame, suspension, body, custom roll cage are all immaculate. The project was started and work done very well but was never completed (wiring, gauges, lights).

Now the woes......

We purchased this with being told it had a mid 70's small block 350, mated with a 4 speed and a NP205 transfer case. So as I start digging into it, I find the casting number and reference it finding out its a 64-65 283 small block. Still a good strong running motor in the CJ, but not whatever we're told by the previous owner that was in it. He did purchase it from the guy who built it. With a bill of sale stating it was in fact a 350.

I guess it's a lesson learned, and now I have to build a sleeper out of the little 283.

All in all I am happy with the CJ, and it looks like I'll need to look a little closer from now on!
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Old 09-02-2012, 07:20 PM   #2
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Just bought a project CJ7, looks like you and I will be in a similar situation, except mine ended up with a Cummins!
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Old 09-02-2012, 07:54 PM   #3
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Nice Cj's
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Old 09-02-2012, 07:56 PM   #4
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Nice looking CJ's.
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Old 09-08-2012, 09:35 AM   #5
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Quote:
Originally Posted by FFire31 View Post
So we just picked up a 76(ish) CJ5 with a full fiberglass body. Frame, suspension, body, custom roll cage are all immaculate. The project was started and work done very well but was never completed (wiring, gauges, lights).

Now the woes......

We purchased this with being told it had a mid 70's small block 350, mated with a 4 speed and a NP205 transfer case. So as I start digging into it, I find the casting number and reference it finding out its a 64-65 283 small block. Still a good strong running motor in the CJ, but not whatever we're told by the previous owner that was in it. He did purchase it from the guy who built it. With a bill of sale stating it was in fact a 350.

I guess it's a lesson learned, and now I have to build a sleeper out of the little 283.

All in all I am happy with the CJ, and it looks like I'll need to look a little closer from now on!
Maybe it's been punched out, stroked, headed...etc. that makes it a 350, ya suppose?
Family has a 70 model here we're working on, but has the original 225 Buick V6 Dauntless. In fact the whole vehicle is original and surprised of it's condition after 42yrs. Supposedly has had a restoration, somewhere along the line, but still surprising.
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Old 09-08-2012, 07:50 PM   #6
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CJ's have always been my favorite. They are just built like tanks. Very nice.
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Old 09-08-2012, 09:38 PM   #7
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my next jeep will diffenently a cj5
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Old 09-09-2012, 10:47 PM   #8
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Nice CJ..

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Old 09-29-2012, 10:26 PM   #9
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Nice jeeps, i've got a 76 im about to do a frame up build on. I cant wait to get started.
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Old 10-10-2012, 11:27 AM   #10
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I think running a '64 283 SB is WAY cooler than some 350 crate motor.
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Old 10-10-2012, 01:50 PM   #11
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A 283 in an early CJ5 is an ideal marriage...
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Old 10-13-2012, 06:05 AM   #12
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That's the one downside to buying jeeps with conversions... you're at the mercy of the previous owners word. None the less it's still a cool looking Jeep
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Old 10-15-2012, 12:12 PM   #13
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I kind of know how you feel. Bought a 78 cj5 with the 360 swap. The guy i got it from has no idea what year the motor is. I had to put a new water pump on and just guessed 78 for the year and it matched up perfect!!
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Old 10-15-2012, 07:35 PM   #14
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With all these mods and conversions over the years, has anyone replaced the 3 speed with an auto on a 70 AMC CJ5? The one we're working on has the Buick V6 with headers and dual exhaust.
I was thinking of using a Gennie shifter that looks original and retaining the clutch pedal for an original look if one was to do it.
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Old 10-16-2012, 08:28 AM   #15
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You can install an auto into a '70 CJ5... most often it is a TH350 or 400.... but its not a simple swap.
Bear in mind that this combo will result in an extremely short drive shaft. There may also be some interference with the front drive shaft. It will be even trickier if there is any lift on the rig. You will need custom driveshafts, the rear shaft may need a double cardan and longer slip joint, and the rear axle rotated...

There is a pretty good reason CJ5s were never offered with an automatic...
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Old 10-16-2012, 09:10 AM   #16
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Quote:
Originally Posted by FFire31 View Post
So we just picked up a 76(ish) CJ5 with a full fiberglass body. Frame, suspension, body, custom roll cage are all immaculate. The project was started and work done very well but was never completed (wiring, gauges, lights).

Now the woes......

We purchased this with being told it had a mid 70's small block 350, mated with a 4 speed and a NP205 transfer case. So as I start digging into it, I find the casting number and reference it finding out its a 64-65 283 small block. Still a good strong running motor in the CJ, but not whatever we're told by the previous owner that was in it. He did purchase it from the guy who built it. With a bill of sale stating it was in fact a 350.

I guess it's a lesson learned, and now I have to build a sleeper out of the little 283.

All in all I am happy with the CJ, and it looks like I'll need to look a little closer from now on!
Which transmission? If it is a 283, about equal chances for a SM 420 or SM 465. A 283 does make a great engine for a CJ and will likely get a little better mileage than a 350 but if it did need a rebuild, I would be installing at least a 350 and probably a 383. The bottom end torque (assuming you pick the right cam) in a 383 is just awesome in a CJ and either a 420 or 465 will handle the power.

Whatever you do, don't over-cam the 283. They are pretty sensitive and it is very easy to completely ruin the bottom end torque.
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Old 10-16-2012, 09:26 AM   #17
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Maybe it's been punched out, stroked, headed...etc. that makes it a 350, ya suppose?
You need a near perfect cast 283 block to successfully punch one to 4". Most will suffer from thin cylinder walls and have heating problems or worse. Building a 302 was the hot rod thing to do back in the day, but starting with a 4" block is a much safer route. For Jeep power, there isn't much difference between using a 302 versus a 283 and IMO, not worth the effort. Also, the early heads are not drilled for any accessories which really makes adding power steering and OBA more difficult.

Not likely stroked to a 350 as the crank journals are not the same but it could be a 327 which also make good Jeep power.
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Old 10-17-2012, 06:24 PM   #18
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I like a jeep to be a jeep. My CJ5 has 258 six right now, but putting in a 304, no modifing to do, and a good motor. also AMC 360, 401 very good.
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Old 10-17-2012, 07:24 PM   #19
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I have a 72 CJ-5 for sale. New seats front and rear. New 2 1/2 in lift. New top/ doors. New wheels and 32/11.5/15 mt. Asking 5000 obo. 3165540000 Haysville kS
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Old 10-17-2012, 07:25 PM   #20
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I forgot to mention. It has a 304 w/ 3 Spd
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Old 10-17-2012, 08:41 PM   #21
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Originally Posted by lynn View Post
You can install an auto into a '70 CJ5... most often it is a TH350 or 400.... but its not a simple swap.
Bear in mind that this combo will result in an extremely short drive shaft. There may also be some interference with the front drive shaft. It will be even trickier if there is any lift on the rig. You will need custom driveshafts, the rear shaft may need a double cardan and longer slip joint, and the rear axle rotated...

There is a pretty good reason CJ5s were never offered with an automatic...
Certainly a lot to it and some pretty good reasons not to fool with it in that regard. Thanks for the info.
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Old 10-17-2012, 08:47 PM   #22
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You need a near perfect cast 283 block to successfully punch one to 4". Most will suffer from thin cylinder walls and have heating problems or worse. Building a 302 was the hot rod thing to do back in the day, but starting with a 4" block is a much safer route. For Jeep power, there isn't much difference between using a 302 versus a 283 and IMO, not worth the effort. Also, the early heads are not drilled for any accessories which really makes adding power steering and OBA more difficult.

Not likely stroked to a 350 as the crank journals are not the same but it could be a 327 which also make good Jeep power.
Thanks for the enlightenment on this. I was sorta talking off the top of my head there, without any real knowledge of what I was suggesting.
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Old 10-18-2012, 10:50 AM   #23
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I like a jeep to be a jeep. My CJ5 has 258 six right now, but putting in a 304, no modifing to do, and a good motor. also AMC 360, 401 very good.
Everyone has their own opinions. Mine is that AMC had 11 years to look at small block Chevy's before designing their own "small" blocks which replaced the really clunker 250/287/327 first gen AMC and they still didn't get it right. Yes, you can make AMC 290/304/343/360/390/401's run almost as well as the comparable Chevys (that said, no way will a 304 even come close to a 302) but it will cost you twice as much to get there and there is at least a magnitude less aftermarket parts available which really limits what you can actually do. Just about anything you can possibly think of is available for the sbc-block to fit big block heads-off-the-shelf-yep, 454 small block-no problem. I am an old guy but am going to put one more sbc together for my flatty: a 370 lb 428. Try that with AMC.
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Old 10-26-2012, 07:40 PM   #24
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Well after some long hard thinking (a 30 pack around the fire) I decided to convert it to a 350. Picked one up taken out of a 70's Monte Carlo, rebuilt it and dropped her in. Let me tell you, what a ride! No lack for power with the cam and other mods I threw at it! It sounds like I spun a crank bearing in the 283 motor, so it's sitting on the engine stand waiting for a new home. Any takers?
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Old 10-27-2012, 07:09 AM   #25
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here's a link to the initial fire up of the new 350

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