5.3 into 72
 

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Re: 5.3 into 72
 

So I started about 2 weeks ago on my LS swap. I have been gathering parts for the last 2 years while I was stationed in Korea. I picked up a gen IV 5.3 4L60E from an 07 suburban. I decided to go with ECE for the engine and tranny mounts. They worked well with my truck pan and they clear my Gibson conversion headers, although it's close. I'm waiting for a harness from bill over at bp automotive. (I've heard nothing but great things about him. Out back I went with a 25 gallon blazer tank with an in tank walboro 255. I'm sure I'm forgetting some things, but I'm just happy to finally get started on my project. It's been a long 2 years thinking about it. I have my fingers crossed, but so far all has went pretty smoothly.

Re: 5.3 into 72
 

First thank you for your service. Project is looking good...Jim

Re: 5.3 into 72
 

Great project and progress. I too thank you for your service!

Re: 5.3 into 72
 

So I'm looking for exhaust exit opinions. I am stuck between coming out behind the rear tire with side exit chrome tips or just coming over the rear end and having dumps behind the bed.

Re: 5.3 into 72
 

I would take it to the rear either out back or behind the wheels, your choice but all the way to the back
YES thanks for your service!

Re: 5.3 into 72
 

This is what I did. It has 40 series flow master clones. A little loud but sounds great.

Re: 5.3 into 72
 

View from under. Just an idea. Keep up the good work on the truck. You will love it when it's on the road.

Re: 5.3 into 72
 

Does anyone have pics of there ECM and TCM mounting in their cabs? I was thinking somewhere in the glovebox.

Re: 5.3 into 72
 

Used PCI harness on my 70 sub and had enough slack to route under the carpet to under the pass seat. Obd2 runs into the console. Just a thought

Re: 5.3 into 72
 

I am waiting on a harness from BP Automotive. Once I get it in I can figure out where I can mount it. I am at somewhat of a stand still on the project right now. Hopefully everything continues to go smooth.

Re: 5.3 into 72
 

I made a bracket and mounted my ecm behind the glovebox..I wish I had put it under the pass seat. Would have made life easier.

Re: 5.3 into 72
 

That's a big chunk of wires to run under the carpet. Am I missing something?

Re: 5.3 into 72
 

I would have gone under the floorboard and came up thru floorboard under the seat. Or I could have tucked it up close to the trans tunnel under carpet.your right though that's still that's a lot of wires to conceal.

Re: 5.3 into 72
 

You guys have me thinking about mounting it behind the passenger seat now.

Re: 5.3 into 72
 

No question that's the way ill do my next one. Mine has that big ac/heater box behind the dash and that doesn't leave much room in there. If they havnt built the harness yet you can get them to extend the length of wires going to the ecm..

Re: 5.3 into 72
 

Bp automotive is building my harness. He told me I would have 5 feet to work with. So I should be good there. I also emailed him to let him know I wanted to mount inside the cab. I appreciate the idea, thank you.

Re: 5.3 into 72
 

I used a psi harness,, quality very good stuff. Mine was a "off the shelf" harness..they would have built it however I wanted though. Another problem I encountered was it was designed to go thru the firewall on the passenger side and I couldn't because of ac box. I had to double it back over to driver side and go thru firewall beside the gas pedal..royal pain.

Re: 5.3 into 72
 

I should have my harness in from BP Automotive next week. I ordered the showstopper harness. Hopefully everything falls into place and I can get it running without any issues. I have decided to mount my ECM and TCM behind the passenger seat on the wall of the cab. I'm going to build a bracket and hang it from the tank bracket. I still have to decide whether I'm coming in from the firewall or the floor of the cab. I'm leaning towards the firewall cause I don't know about having all the wires underneath the cab.

Re: 5.3 into 72
 

Are you going to have enough harness length to do that? The back wall is another 20" or so from where most harnesses would stretch to.

Re: 5.3 into 72
 

Bill at bp said I'll have 5 foot of harness to get into the cab with. I explained specifically what I was looking to do and he reassured me it was possible.

Re: 5.3 into 72
 

Anyone have some advice on where to pick up some rubber isolators to mount my ecm and tcm to their brackets? As BP advised me, I don't want them to be grounded.

Re: 5.3 into 72
 

Mcmaster carr has all types of isolation pads to chose from..they are excellent to deal with and ship extremely fast.

Re: 5.3 into 72
 

IMO just go grab a small 1/8" sheet of silicon. Reason I say this is that; its cheap, it can be used for gaskets and other stuff, and it has a greater dampening/isolation effect than rubber, plus is far more chemical resistant.

I took a little weatherstrip adhesive and put two little strips of silicon sheet on my ecu to do just that.

Re: 5.3 into 72
 

I second the McMaster Carr suggestion. I'm a firm believer in these type mounts/isolators and have been using them for years in all types of applications. (air ride compressors, air ride valve plates, MSD boxes, ECU's, anything that generates noise/vibration OR anything that vibration could harm).

http://www.mcmaster.com/#rubber-isolators/=xkah1c

Look for the "Vibration-Damping Sandwich Mounts"

I like the look of these as they are engineered solely for the purpose of isolating vibration and resonance sources - think aircraft applications. This type mount combined with poly-loc fasteners give your truck a more "thought out" & "engineered" look where the rubber/silicone sheet just stuffed under a noise source looks a bit amateurish and just plain cheesy in my opinion.