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Unread 12-30-2013, 12:11 PM   #1
dagr8tim
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304 in a CJ5

I just found a deal on a 304 out of a 79 CJ (I think it was a 5).

I'm wanting to put this into my 75 CJ5 that started life with a 258 and currently has a 232 in it. The goal is to get this bolted between the frame rails in one day as I'll have to rent a cherry picker.

I've read some things that the passenger motor mount will need to be changed. The VIN says it has a T14, but the PO says it's a T15. Being as the engine was swapped and the tub is a badly chopped CJ7 tub, neither would surprise me. As soon as I get some time, I'll crawl up under and verify the casting numbers and measure the tranny.

Is this doable? I've never done an engine swap before, so perhaps I am over simplifying it. But I'm hoping I can get it lined up on the bellhousing and set it on the motor mounts and bolt everything up. If I can get that done in one day I'll be happy.

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Jeeping - The art of getting dirty & going broke while slowly heading nowhere, and taking all day to do it.

97 XJ SE - DD/Light Trail Rig - The War Wagon
75 CJ5 with a badly chopped CJ7 Tub - Pandora
96 Land Rover Discovery - Black Dog; possible trail toy
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Unread 12-30-2013, 01:33 PM   #2
frhrwa
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no problem.. find another '75 era cj and measure from a known point to the center of the motor mounts.. measure yours and figure which side has to be cut off and replaced.. cut it loose, get your welder out, weld on the new one in the right spot and drop it in.. my '75 had a 304 in it.. my '78 came with a 304 and I changed it to a 401 HiPo.. basically same, larger intake, MUCH more horsepower.. but the 304 is a good one..
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Unread 12-30-2013, 01:37 PM   #3
Matt1981CJ7
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I think a day is doable, if you have the old engine completely ready to lift when you bring the cherry-picker home.

A handy helper would almost guarantee it.

Good luck,

Matt
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Unread 12-30-2013, 02:17 PM   #4
CSP
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There's no need to cut and weld anything. The motor mounts bolt onto the frame rails.

The '75 and older mounts are a little bit different than '76 and up at the frame side. The later ones will work, but one of the holes will be off.

There's lots of info on this swap here: http://www.jeepforum.com/forum/f8/of...thread-377983/
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Unread 12-30-2013, 03:57 PM   #5
Jamesromeos
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With a lift and air tools I had my 4.2 out and the 304 in with new mounts, all accessories, brackets, and much of the wiring done in 5 hours. The next day spent 3.5 hours working out all of the things I missed, tune, time ETC. All in all my first swap alone....easy!
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Unread 12-30-2013, 04:08 PM   #6
JeepHammer
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If the 304 is running right, you won't be able to slap the smile off your face for at least a week. Nothing like a go cart with a V-8!
Fingers rubbing the back wheel while you are sitting in the drivers seat and having a V-8 at the other end of the 'Skinny Pedal'!

I punched in a 360 (Grow on trees) and started breaking parts. Turns out things like drive shafts and front axles, rear axle flanges don't like even stock 360 very much, so 304 is about perfect if you don't want to start the break it/fix it cycle...
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Unread 12-30-2013, 04:22 PM   #7
bradleybrb
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My 304 swap went it easy too. My 304 was out of a 78. I swapped my 258 out for it. One of the motor mounts was different. My biggest problem was lining the transmission back up and getting it bolted to the motor. I could have used some help there. I put my t14 that was behind my 258 behind the 304. It works fine, but the 304 might eat it if I really got ruff with it. I think you can do it in a day easy if you have your ducks in a row.
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Unread 12-30-2013, 05:56 PM   #8
dagr8tim
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Thanks for the words of encouragement. I just pulled the trigger on these. I think I'll send them out and have them powdercoated ahead of time. Or just sand blasted and paint/prime them myself.

http://www.ebay.com/itm/271358567658
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Jeeping - The art of getting dirty & going broke while slowly heading nowhere, and taking all day to do it.

97 XJ SE - DD/Light Trail Rig - The War Wagon
75 CJ5 with a badly chopped CJ7 Tub - Pandora
96 Land Rover Discovery - Black Dog; possible trail toy
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Unread 12-30-2013, 06:20 PM   #9
CSP
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Hmm, I hope those were from a CJ. If they are from a fullsize Jeep they won't work as the frame rails are further apart on the FSJ.
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Unread 12-30-2013, 11:52 PM   #10
Rollbar
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We took Jr's 304 out and replaced it w/a 360 etc. Find a 360 IMHO

http://www.jeepforum.com/forum/f8/jr...oject-1519633/
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Unread 01-02-2014, 11:31 AM   #11
dagr8tim
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Quote:
Originally Posted by CSP View Post
Hmm, I hope those were from a CJ. If they are from a fullsize Jeep they won't work as the frame rails are further apart on the FSJ.
Guy seems to specialize in CJ parts, so I'll hold out hope. I only need the brackets and the passenger frame mount. Even if they are from an FSJ, repop brackets would be more than what I paid for all of that.

Quote:
Originally Posted by Rollbar View Post
We took Jr's 304 out and replaced it w/a 360 etc. Find a 360 IMHO

http://www.jeepforum.com/forum/f8/jr...oject-1519633/
Thanks for the info. That may be Stage II. ;-)
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Jeeping - The art of getting dirty & going broke while slowly heading nowhere, and taking all day to do it.

97 XJ SE - DD/Light Trail Rig - The War Wagon
75 CJ5 with a badly chopped CJ7 Tub - Pandora
96 Land Rover Discovery - Black Dog; possible trail toy
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Unread 01-02-2014, 09:41 PM   #12
BeastOfBurden
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You will be immensely happy with the 304 brother.
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Unread 01-02-2014, 11:51 PM   #13
KultureCJ5
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Love my 304!! Where I ever I go folks wanna know what's under the hood.

Sent from my iPhone using JeepForum
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Unread 01-03-2014, 12:39 AM   #14
only in a jeep cj
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Yes, those are what you need. The 75 and back engine mount frame bracket holes are different than the 76 and later. So if those are from a 73 CJ5, your good. The way to tell the block brackets difference between the CJ and FSJ V8s is the FJC is taller and flat when placed on a table mount side up. The CJ is shorter and slopped at an angle.

I was lucky and got the whole donor CJ. I swapped in the engine,brackets,exhaust, T-15 (that is used with the 304 vs the T14 used with the 6cyls), the engine wiring harness, and the fuel lines. I also swapped in the power steering box and lines.

The T-14 used the forward set of crossmember holes at the frame rails while the T-15 uses the rear set. Its a slightly bigger and loner unit. Insides are beefier too.

Testing out the 304 after the install. The braking sound at the end is me stopping before I go out into the street.

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1975 CJ-6 304 T15 Dana20 30/44 3.73
1983 CJ-8 258 T5 300 30/44 3.31 Looking for full or half hardtop buy or trade
1986 CJ-7 Laredo 4.6 stroker T5 300 30/44 3.31
1986 TJ-7 Trail Jeep project in the works
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