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Unread 02-05-2013, 09:56 PM   #1
blackj10
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1980 J-Series Truck 
 
Join Date: Dec 2009
Location: oregon
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j10 engine swap

hey everyone....
gotta 1980 j10 258 six with a 4 spd and 208 np transfer. 218k on the rig, rebuilt the engine about 100k ago. 2 barrel carter carb was replaced about 20k ago. in wyoming with the new carb, the old girl ran like a new truck. burning ethanol out here in oregon, runs like crap, have to run with the choke out a little bit. that a normal thing for this ethanol? anyway, looking to get some more power to pull the boat and upgrade. any suggestions on something that would make a relitively easy swap in this truck and bolt up to the trans? like to go with a diesel, but gas is fine. only getting around 12mpg now burning the ethanol in the 258 now. open to suggestions. Thanks.

chris

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Unread 02-05-2013, 11:06 PM   #2
pleontks
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1976 J-Series Truck 
 
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304/360/401 will all bolt in fairly easily
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Unread 02-06-2013, 07:52 AM   #3
timgr
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No, a V8 will not bolt in easily. There are many differences between the V8 and 258 trucks. The V8 and six are located differently in the chassis, and the overall length of the V8 and six transmissions is different, to accommodate this. If you bolt up the V8, it won't clear the firewall. And there are other differences, like core support, engine brackets, and lots of details. Not so easy.

I'd go with a AMC 4.0L HO engine. This will give you the excellent Mopar multiport fuel injection, with a significant increase in power and economy. And it will be an easy swap for the 258, compared to a V8. No change in the mounts or the engne position, and it bolts up to your existing bellhousing.
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1) '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps. 2) '82 J20 360/T18/NP208/3.73, KOs, 7600 GVWR 3) '75 CJ-6, 304/T15, PS, BFG KM2s, soft top 4) '95 VW Golf Sport 2000cc 2D
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Unread 02-06-2013, 07:58 AM   #4
Ripper3494
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Since it's a decent size truck I'd say put in the work and go big, get a donor truck and drop in a newer model (gen III). Vortec engine. Good clean power and better mileage
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Unread 02-06-2013, 02:09 PM   #5
CSP
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Quote:
Originally Posted by timgr View Post
I'd go with a AMC 4.0L HO engine. This will give you the excellent Mopar multiport fuel injection, with a significant increase in power and economy. And it will be an easy swap for the 258, compared to a V8. No change in the mounts or the engne position, and it bolts up to your existing bellhousing.
^^^This^^^

One bolt is different for the motor mounts (location is the same, just metric). The web is full of into on wiring the EFI.
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Unread 02-06-2013, 09:53 PM   #6
blackj10
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thanks all i'll explore the options. much appreciated.
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Unread 02-08-2013, 10:53 PM   #7
blackj10
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Quote:
Originally Posted by timgr View Post
No, a V8 will not bolt in easily. There are many differences between the V8 and 258 trucks. The V8 and six are located differently in the chassis, and the overall length of the V8 and six transmissions is different, to accommodate this. If you bolt up the V8, it won't clear the firewall. And there are other differences, like core support, engine brackets, and lots of details. Not so easy.

I'd go with a AMC 4.0L HO engine. This will give you the excellent Mopar multiport fuel injection, with a significant increase in power and economy. And it will be an easy swap for the 258, compared to a V8. No change in the mounts or the engne position, and it bolts up to your existing bellhousing.

hey timgr...any particular years better than others? pre-96 vs post 96?
thanks
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Unread 02-09-2013, 06:10 AM   #8
timgr
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I believe the best option would be a 4.0L from a 92-up XJ or Wrangler. The engines prior to 1992 were not the "HO" type, using a different cylinder head and the Renault-Bendix (Renix) fuel injection. You want a donor that uses the 92-on Mopar MPI and the HO cylinder head. Check the cylinder head casting - the 0331 head (ca 2000) was prone to cracking in its first few years, so be aware of that. New replacement cylinder heads (improved casting) are fairly cheap, so a donor from this era with a cracked head could be a good choice. '92-99 should be a safe bet, and '96-on has a better (stiffer) block).

I know the WJ guys complain that the 1999-on 4.0Ls are less durable than the earlier ZJ engines, due to the head issue and breaking piston skirts? The GCs have some different block configurations that may not drop in for the 258 - but I'm no expert in this area. If you find a candidate donor, you could check it out by posting on JeepStrokers.com - JeepStrokers also has useful FAQ postings that describe the component parts. NAXJA is another possible place to ask. However, I don't know of any place on the net where there's a table listing the issues of each of the possible donors wrt a 258 swap. So if you find an unusual donor, you'll likely have to check it out by asking for specific info. Make sure the engine mount brackets are going to work, if you find, say, a 2004 Grand Cherokee.

The accessories and beltage (is that a word?) will change based on the donor, so you'll have to decide whether you want to swap over all the donor's accessories, or keep your 258 accessories. For example, the fan offset may be different in your donor - definitely an XJ donor will have a different fan offset - but you could use the stuff off the XJ if you fit an electric fan.

hth!
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1) '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps. 2) '82 J20 360/T18/NP208/3.73, KOs, 7600 GVWR 3) '75 CJ-6, 304/T15, PS, BFG KM2s, soft top 4) '95 VW Golf Sport 2000cc 2D
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Unread 02-09-2013, 01:40 PM   #9
CSP
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Just to widen your range of years it's actually 91 and up that are HO with the Mopar EFI.
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Unread 02-09-2013, 03:35 PM   #10
blackj10
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thanks all...the 4.0 is the route i'll no doubt end up taking. wife was talking about possibly getting another truck....WHAT? only logging a few thou a year at most, i'm certainly hoping this truck will outlast me. after all she's only 32 years old, and been with us since day one. for the low miles she gets each year, i'd rather put the dough into her than another truck. thanks again folks.
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