4.3L Vortec a good CJ7 engine swap? - JeepForum.com
 
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post #1 of 6 Old 11-04-2007, 11:17 AM Thread Starter
DirtEater
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4.3L Vortec a good CJ7 engine swap?

I found a 4.3L mated witha 4L60 tranny for a reasonable price out of a 2WD Chevy truck. What kind of issues might be associated with a swap like this? Will it mate withj my Dana 300? Stock 4.2 has around 143,000 and I don't think it's ever been rebuilt and it's response is feeling pretty sluggish. Time for a change, I think.


Terry ~ USN Ret. 30Sep07 : )
1982 CJ7 4.2L ~ T-999 ~ Dana 300 ~ SOA Conversion
Dana 30/AMC 20 with Truetrac - one piece axle - 4.10's
33" Toyo M/T's on Pro Comp Xtreme Series 1069
Borla header and Catback Exhaust System
Jeeperman bumper w/ Ramsey Patriot 8000 - Jeeperman tire carrier/bumper
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post #2 of 6 Old 11-04-2007, 12:17 PM
flexncj7
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4.3 votec would be a great swap for a daily driver. Good balance of mileage and power- both of which would be increase over stock. The transmission will not bolt up to the tcase, as it is a 2wd model. Even with a 4wd transmisson you will need adapters to bolt up to a Dana 300.

Engine mounts and most of everything else would be the same as a Chevy V8 which has been done a gazillion times.

1985? Jeep CJ-7: 360, 999, D300, LOMAX 4:1, Dana 44s, 4.10's, Aussies front & Detroit rear. S0A, York OBA, YJ tub, 36" IROKs-
1989 YJ Sahara: 258, puko tranny, np231. 2-3" spring and 2" body lift. 33" TSLs- latest project.
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post #3 of 6 Old 11-04-2007, 05:34 PM
bdmonist
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What year is the tranny? Doesn't really matter if it is four or two wheel drive, you can make both work with the D300 with either a $500 adapter from Novak or AA; or a $50 NP208 adapter and a $175 input shaft for your D300. Since it is a 2WD, you will need another output shaft for your tranny, can be as little as $40. If it is the 4L60E, you will need a high dollar controller for it, I think they came out in 93?

1984 CJ 7, SBC 350TBI, 700R4, D 300, AMC 20, D30, 35" Mickeys, 3.54 Gears, 4" susp. Lift, 2" body lift.

AMC 20 Write Up
In Progress - 4.56 gears, Aussie Rear Locker, Moser 1 Piece Axles
Coming Soon - CV Shafts, Welded Tubes, trusses
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post #4 of 6 Old 11-04-2007, 07:04 PM Thread Starter
DirtEater
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It's out of a 2007 full size p/u and only has a few thousand miles. But it sounds like I may be better off with one out of a 4wd considering all the adapters posisbly required. I've never done an engine swap and would pay a shop to do it because I'm not talented enough to do it right.

Is a 4.0L a more logical swap than a 4.3L Vortec? I know the 4.3L has about the same rated hp, but it has more torque, although the 4.0 peaks at lower rpm. Also, I'm fairly sure that the 4.3 is more fuel efficent than the 4.0. I had a 4.0 in a 2000 TJ and it sucks gas quickly. Kinda funny that my Dodge Cummins gets about 17-18 mpg and weighs around 7500 and the TJ weighs about 3500 and only got 10mpg, which is still better than my current 4.2 is getting.

Terry ~ USN Ret. 30Sep07 : )
1982 CJ7 4.2L ~ T-999 ~ Dana 300 ~ SOA Conversion
Dana 30/AMC 20 with Truetrac - one piece axle - 4.10's
33" Toyo M/T's on Pro Comp Xtreme Series 1069
Borla header and Catback Exhaust System
Jeeperman bumper w/ Ramsey Patriot 8000 - Jeeperman tire carrier/bumper
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post #5 of 6 Old 11-04-2007, 07:10 PM
bdmonist
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It doesn't matter if it's a 4wd or 2wd, you need the same adapters. THe only difference is that you will need a 4wd output shaft, which is shorter. That's really the only difference (pre 93 anyway). If you go with that tranny(post 93, which yours is), it will have to be controlled by the computer, so make sure you get that with the swap. Since it is required to be controlled by a computer, that's as far as my knowledge goes. Good Luck!

1984 CJ 7, SBC 350TBI, 700R4, D 300, AMC 20, D30, 35" Mickeys, 3.54 Gears, 4" susp. Lift, 2" body lift.

AMC 20 Write Up
In Progress - 4.56 gears, Aussie Rear Locker, Moser 1 Piece Axles
Coming Soon - CV Shafts, Welded Tubes, trusses
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post #6 of 6 Old 11-05-2007, 07:20 AM
Redmanchew
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Dirteater,
Do a search for posts from myself or from Dirtman13. We have both done the 4.3/4L60E swap. Niether of us have big writeup on it but i will be more then happy to help with any info you need.
BTW is the motor from the Guy on ebay selling the part outs? If so good to work with. I got a 03 setup w/ 28,000 and all the harnesses for $1200.

1982 CJ-7 2003 4.3 chevy vortec, 4L60E, Clocked Dana 300 35 x 12.5 x 15 KM2 on Cragar 399's. Vanco Brake Booster. Power steering conversion. Warn front and rear bumpers with swing away. Moser 1 piece rears. Rear OX.

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Quote:
Originally Posted by twoleos617 View Post
To reiterate for the 1,067th time, when towing...
remove rear axle, xfer in N, trans in 5th, remove neg batt cable, key to Run and go??
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