painless/ howell wiring harness tbi 350 87yj -
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Unread 06-24-2014, 03:44 PM   #1
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1987 YJ Wrangler 
Join Date: Aug 2010
Location: pittsburg, kansas
Posts: 7
painless/ howell wiring harness tbi 350 87yj

So Ive been searching the forums and Google and seen lots of recommendations for the painless and howell kits for this swap but nothing that goes in to what is needed to wire these kits in to the jeep. I have emailed both painless and howell about what they offer for this swap and haven't heard back yet and im impatient. My question is are either of these kits a total replacement style kit, ie replace all the jeep wires and the 350 wires so there is no splicing of the two harnesses. I am getting a rebuilder 350 for pretty cheap and it does not include the harness, not sure about the computer with the motor yet, so any aftermarket sources for a computer would be my second question I guess. the motor is a tbi 350 out of an 87 Silverado. the jeep is an 87 yj with a nv3550 already swapped in, np231 that im going to swap a d300 for and a narrowed danatrac d60 rear on 35s

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Unread 06-29-2014, 03:03 PM   #2
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1987 YJ Wrangler 
Join Date: Aug 2006
Location: Rockledge, Florida
Posts: 900
I used the Painless kit for my TPI and thought it was very good quality and easy to install. The harness was for the engine only and I dont believe they make a complete harness kit for a Jeep with a transplant engine. I'm sure you could probably have one made from Howell or someone for a cost. It wasn't hard to seperate and delete what I didnt need from the factory harness and add the Painless engine harness. Use a Haynes/Chilton manual or one from All Data for the wiring schematics.
87 YJ, TPI 5.7, 700R4, NP231, BDS 3.5" lift, 1" front & 5/8" rear boomerang shackles, Rubicon Dana 44 rear axle, 33" Goodyear Duratracs

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Unread 07-01-2014, 07:22 AM   #3
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1989 YJ Wrangler 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,006
You are set up with most of the loads off the starter relay. The interior wiring shouldn't need to be touched for an engine swap.
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