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SPDRCR LS1 and 4l60e Build Thread

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Drilled some holes for the trans mount. Rivnuts are fun. 


mount in. It’s a tight fit. 



unfortunately I ran into into clearance issues. Not totally unexpected. The fittings for the trans cooler lines were squished on the tunnel wall. I tried to hammer it after dropping the trans down but couldn’t get the leverage. Then shenanigans ensued when I dropped the trans too much and the engine slid back so the intake was stuck in the firewall. Took me a minute to figure that mess out. Good times. 

Ended up having to pull everything most of the way out and mashed the passenger side tunnel right on the crease about 1” in. 

added some paint after all the banging. Then put it back in. 

Test fit the driveshaft and it was short. After conferring with you guys decided it was too much and contacted JCI. They are taking care of me. 


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Got the fuel line ran. I used nylon braided line. I used the old fuel p clips and cut half the rubber out of it. That made a good spot to run the fuel line. I left 2 holes in the mount and that holds the brake line and power line. I forgot to take a pic of that. I’m going to get a 90 fitting on the fuel rail to change the angle a bit cuz the line sits on the battery. 

I’m going to be an electrician soon if I mess with wires anymore. Here is the harness laid out. I’m really glad I didn’t wrap it on the bench. I had to cut the 02 sensors out to get the where they made sense. 



I created a new wire pulling tool. I can make extras if anyone wants in on a group buy or something. 


this is an absolute mess rights now but I really wanted the ecm in the car to keep the bay cleaner. I was able to pull the factory wiring through the firewall and strip all the old wires I don’t need anymore. The I slid the ecm connectors one at a time through the hole. 



here is my fusible link replacement. Just plain blade fuses that are powered directly from the starter line. I put on the 4 red and white wires that came from the links. 



then I made up a relay box. Using 5 relays and 6 fuses. 

fan relay and fuse 

fuel relay and fuse

starter relay and fuse 

ignition relay and 2 fuses split pass and driver side coils, inj, etc 

brake signal relay which will receive power from the brake light and ground the ecm tcc signal 




Edited by Spdrcr

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I love wire loom so much! I wish I could do it for a living... bleh!



plug wire is hitting the battery tray. I don’t know if I’m going to fix the plug or the tray. 



new driveshaft has arrived. still have to test it. 


picked up some plugs for all the extra ports



my pcv is going to be the factory line from the throttle body to the front passenger valve cover

rear passenger side plugged 

rear driver side has pcv valve in the cover itself 

pcv valve to old evap selonoid port  

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Need to get the cooling system hooked up so I can run it up to temp. 

upper hose

Lower hose


Steam port cut into the upper hose



needed to mount an overflow tank so I grabbed a universal job. 

gonna try and get it on the existing bracket




it came with a bracket that the holes lined up perfectly with the holes on the car 




gonna chop it 


warned you my fabrication is subpar 





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Driveshaft is in and fits perfect now. Just enough room to slip it in. 


the factory bolts were too small they did not go all the way through the nut. Grabbed some 5/16 x 1 1/2” bolts and washers that work great. 



here is spicy of the fuel line, power, and brake line. 


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