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Old 06-04-2011, 01:40 PM   #1
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79 CJ7 Questions?

I am getting ready to buy a 79 CJ7....it has the straight 6 in it right now. The seller is going to give me the 304 with it. How hard is the engine swap? Also, how do I identify the trans, transfer case, and axle setup? What are the best setup mix for a moderate daily driver and going off road? And is going from leaf springs to coils a pain in the ass too? I am a former TJ and JK Rubicon guy, and don't know much about the CJ's.

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Old 06-04-2011, 01:48 PM   #2
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I had a 79. T-case should be model 20, rear axle amc model 20 front axle dana 30. Not sure what mods it has but you will need to upgrade the shafts on the model 20 rear to 1pc vs the stock 2pc. Trans could be anything.. I had a 3spd t-150 in mine. Axles are narrow trac vs. the 1981 or 1983ish wider ones. Coil conversion PITA, Spring over would be better.

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Old 06-04-2011, 02:54 PM   #3
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x2 what 4jeepn said.

Amc 20 pumpkin is round and looks like a bowl. Narrow track axles unless swapped.

Bolt pattern on bell is the same on 4 cyl, 6 cyl and v8s. Clutch will be different. Probably different motor mounts too.

I'd recommend a hei style dizzy swap on the 304.

Is it a 3, 4, or 5 speed?

Stick with leafs unless you are a good fabricator. I recommend swapping to yj springs. Plenty of kits out there. I like ome myself.

I'd swap over to a dana 300 because it is stronger but not sure how much wrench time you want to do. Gear ratios to tire size are about the same on cjs as tj's.
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Old 06-04-2011, 03:51 PM   #4
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I appreciate the info guys.....a guy I work with has it, and is gonna bring it by for me to drive for a few days to see what I think. Once he does that, I will post pics, and get y'all to give me some suggestions and opinions. I haven't been in a CJ7 since I was knee high to a grasshopper, hahaha....
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Old 06-04-2011, 05:12 PM   #5
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I'm in the middle of a 258 to 304 swap on my 80 CJ7. I have a set of Mountain Off Road (M.O.R.E.) motor mounts which are very different than standard style mounts. Also, most of the external components from the 6 will work on the V8, but some of the brackets are different.
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Old 06-04-2011, 06:19 PM   #6
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I would run Scout axles your CJ. Stick with the leaf springs they are easy to set up. add lockers and low gears call it a day.
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Old 06-05-2011, 06:45 PM   #7
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I was going to swap scout axles under my CJ, but there was some issue with the larger U bolt on the front passenger side that goes over the boss on the pumpkin. That was years ago, but I think that was the issue. Also, the scout axles are set at 0 degree camber and need to be more like 6-7 degrees. So, the spring perches from scout Danas would need to be removed and rewelded to CJ specs. It can be done, but don't think it's just a bolt on swap.
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Old 06-06-2011, 07:03 PM   #8
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Youve got most of that right. I have a cut down Scout Dana 44 front axle. Yes you have to remove both knuckles and cut 3 5/8 off the long side and reweld them back on I did 10degrees (4 " lift) I had a Shop do it for me. I used a grinder to solve the ubolt issue easy to do.You have to cut off the small spring perch and set the pinion angle. The Rear Dana 44 is easy to do. What do you ge with a front Dana 44.1 Bigger ringgear 2 bigger axle shafts (you have to cut the long side and respline)3 bigger U joints.
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Old 06-07-2011, 12:28 PM   #9
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There you go, I knew someone must have done it. I in over my head with mine. I had the rear perches reset to CJ measurements, but then I realized the time cost for a shop to rework the front 44. I had to really look at my needs. My CJ is my daily driver, so I decided that building up the wide track CJ axles was good enough. I put in 3.54 gears with a Spartan up front and Detroit in the rear. I also put in a Dana 300 4:1 low gear conversion kit. For my needs these changes were perfect,it's not like I'm driving thru Moab on my way to work everyday!
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Old 06-09-2011, 06:51 PM   #10
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before 1994 the Dana 30's had small U joints. If you blow a Ujoint and it then takes out the balljoint you are in trouble. After 1994 the Dana 30 has the same size u joint as a Dana 44. A late Scout Dana 44 is a true Dana 44. A Rubicon Dana 44 is not.

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