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Old 08-15-2016, 10:00 PM
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1991 yj 5.3l

i recently purchased a 2003 chevy 5.3l with 120,000 on it ready for a drop in for $750 an.d I'm searching for the best options for motor mounts. I haven't completely decided between a 4l60e or an nv3550 from a jeep. I would like to keep all my gauges so I know I need my mechanical transfer. but the adapter for the transfer to tranny cost as much as the engine. just to pricey so looking for theories on that as well. its going into a 1991 jeep wrangler s 2.5l ax5 thanks for advice in advance. I'm wanting to keep this to a budget and will be doing the labor myself.

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Old 08-19-2016, 07:33 AM
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got the 5.3 in the garage yesterday. waiting to find a deal on a 4l60e, looking to buy the motor mounts today. cant decide between advanced adapters or novaks. and suggestions would be appreciated. thanks.

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Old 08-19-2016, 10:04 AM   #3
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I built my own motor mounts. Shop around, you do not have to buy directly from Advanced. Check Simmit Racing and Jegs, they sell them also.

Awhile back I bought my Advanced headers from Summit, I think I got them in 2 days with free delivery AND about $100 cheaper than buying from Advanced.


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Old 08-19-2016, 12:56 PM
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purchased the mounts through morris offroad. advance adapter brand.
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Old 08-19-2016, 06:27 PM
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Do I need to keep the 2.5l ecm and wiring harness to make the stock gauges work with the 5.3l?
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Old 08-20-2016, 12:34 PM
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My 5.3 came from an 03 Tahoe it's the flex fuel. I grabbed the pedal with it too but I don't see how the pedal is suppose to mount without it protruding out to far
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Old 08-22-2016, 08:02 PM   #7
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I used Novak engine mounts. I liked the adjust ability that they provided.

You should plan to use the 5.3 engine harness and ECM and determine which sensors on the engine go to gauges versus the ECM. The oil pressure, voltage, and water temperature should be easy to splice into the original Jeep wiring. The tachometer requires an adapter that translates the signal or you need to change out the head unit.

If the 5.3 engine harness and ECM are not available I would start looking for them unless you want to go with a custom made harness from Painless (still need the ECM).
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Old 08-23-2016, 07:07 AM
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I have the stock harness for the 5.3 and the computer and the pedal. I sold my old 2.5l but kept the computer and complete harness off it because I wasn't sure if I needed it. Do I need it? If not im going to send it to the guy I sold the engine to.
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Old 08-23-2016, 08:49 PM   #9
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You don't need the computer for the 2.5l.

The harness is a little bit harder to say because you will want to interface the 5.3 harness and the 2.5l harness for connections that go from the engine to the interior such as the ignition switch, gauges, etc. You can probably not use the 2.5l harness but until you know I would hang on to it.

You will need a good wiring diagram for the 5.3 and the Jeep. I have the full service manual for the '92 and it probably is close enough to the '91 that I can provide selected information if you need it. Timing can be a problem as I travel a lot so when you need wiring information it may take some time for me to get it to you.
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Old 08-23-2016, 09:14 PM
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I wasn't sure. I figured I didn't need the old computer but didn't wanna let it get yet until I was certain. The 5.3l harness is a work in progress. The truck I got it from has a bad power steering line so the lower harness is a hot mess. Got the advance adapter mounts in today. Bolted those on the block and they cleared the manifold. I don't think the manifolds will clear the frame though. But I have spare 05 gto manifolds that I am hoping will work.
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Old 09-04-2016, 09:01 AM
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Came across a 80e for free. It shifts just doesn't go in gear all the time. Anyone have an idea if the hybrid between the s10 transfer and my transfer will still bolt up to it.
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Old 09-09-2016, 08:13 PM
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So I ended up just getting a good deal on a 60e didn't wanna rewire for another transmission. Got the motor mounts chopped off the jeep. The ls is ready to be set but I still need a transfer case. I can't seem to find a s10 in my area with a transfer. Anyone have an idea of what other vehicles the np231c comes in that will bolt to my 60e
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Old 09-17-2016, 08:24 PM
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I started this build after I wrecked on feb 5 2015 been working on it ever since. Completely rebuild from the ground up. New frame. new front clip. All new suspension all new interior except seats they are expensive so waiting in them. Fresh paint. New front bumper. Rebuilt axles. Now replacing the engine
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Old 09-20-2016, 08:37 AM   #14
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Looks great. Excellent job.
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Old 09-20-2016, 12:16 PM   #15
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Quote:
Originally Posted by gagedunlap16 View Post
I started this build after I wrecked on feb 5 2015 been working on it ever since. Completely rebuild from the ground up. New frame. new front clip. All new suspension all new interior except seats they are expensive so waiting in them. Fresh paint. New front bumper. Rebuilt axles. Now replacing the engine
I'm a bodyman. We would see windshields like that often. I'll bet you were picking broken glass out of your forehead for weeks.

ALWAYS wear your seatbelt.

Good Luck, L.M.
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Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 09-20-2016, 12:40 PM
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It was actually my fist through the windshield. My chest wrapped the steering wheel around the column but that's what kept my head from hitting the windshield.
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Old 09-20-2016, 01:07 PM   #17
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I had a full sized GMC with the 5.3 in it. I loved that motor.
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Old 09-29-2016, 01:04 PM   #18
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I'm going to be attempting this engine swap with a 4.3 into my 94. looking forward to seeing yours
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Old 10-01-2016, 08:17 AM
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Sorry guys been busy with work haven't had a lot of extra build time. But I got the transfer case together and now everything is mated and ready to tack the engine mounts in. Curious so see how it goes I've gotten a lot of opinions in how the set the mounts. We shall see hopefully will have the mounts welded in by the end of the weekend. I find that the swap itself is pretty straight forward. But finding the time to complete the task is a full time job on its own.
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Old 10-01-2016, 09:28 AM
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Before I drop it in
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Old 10-03-2016, 07:16 PM   #21
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Looks good... I want the same combo in my 95... just waiting for the time...
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Old 11-24-2016, 09:27 AM
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hey guys curious what people used as a shifter on their swap. im running a 4l60e
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Old 11-25-2016, 11:51 AM   #23
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hey guys curious what people used as a shifter on their swap. im running a 4l60e
I bought a lokar 16 inch shifter I'm planning on using. I also have an f-body 1990 camaro console cable shifter I was thinking of using and I guess that would be the cheapest shifter to use but I like the look of the lokar shifters. Steer clear of American Shifters as I've seen a ton of people have problems with them in the offroad and hot rod communities.
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Build Thread 1989 YJ, Chevy 355 TBI, 700r4, np231 sye/wide chain/6 pinion planetary, D30/8.8/4.56, 33" A/T's, bds 3.5" springs, 1" Boom Shackles, crossover heim steering
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Old 11-26-2016, 12:37 AM   #24
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I also used a Lokar on a 4l60e for my jeepster project. Looks good and works well. Lokar also has the kit for the back up light switch.


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Old 11-27-2016, 10:06 PM
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I also used a Lokar on a 4l60e for my jeepster project. Looks good and works well. Lokar also has the kit for the back up light switch.


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What size shifter did you use
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Old 11-29-2016, 09:46 PM   #26
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18" stick.



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Old 12-22-2016, 05:53 AM
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I finished my stand alone harness for the engine the other day and now I'm starting my harness for the gauges and the reverse lights. I was curious how others hooked their reverse lights up. Did you wire them to the park neutral switch or did you purchase an aftermarket back up switch?
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Old 12-22-2016, 06:38 PM   #28
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I finished my stand alone harness for the engine the other day and now I'm starting my harness for the gauges and the reverse lights. I was curious how others hooked their reverse lights up. Did you wire them to the park neutral switch or did you purchase an aftermarket back up switch?
I ordered the lokar switch that mounts to the transmission pan bolts
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Build Thread 1989 YJ, Chevy 355 TBI, 700r4, np231 sye/wide chain/6 pinion planetary, D30/8.8/4.56, 33" A/T's, bds 3.5" springs, 1" Boom Shackles, crossover heim steering
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Old 12-23-2016, 01:26 PM
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When integrating the factory jeep harness and the ls harness together what all did you all do to the jeep harness?
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Old 01-26-2017, 07:42 PM
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Hey guys I have the engine in running sounds awesome still have some to finish. But I for some reason can't get the tach to work. Was told that it's suppose to be plug and play but I'm not getting a reading at all when I connect the tach wires. Any help would be appreciated thanks!

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