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Just bought an LS drivetrain.

Ron84cj

Scrambler Junkie
Lifetime Member
City
West Bend
State
WI
I agree. Just thought it was worth mentioning. I also used a Walbro GSL392 (255lph) on the frame rail. Did you use the stock sender? Just wondering if you have had any issues with the 1/4” return not returning enough fuel and potentially causing to much fuel pressure at the rails? Thanks and sorry OP for the high jack.
Yes, I used the stock sender. Zero problems. I used 5/16" line for the feed and the return. It then necks down to 1/4" right at the sender. I called Walbro directly and it was them that actually recommended this to me.
 

JPCRZY

Legacy Registered User
City
Lakewood
State
Co
Yes, I used the stock sender. Zero problems. I used 5/16" line for the feed and the return. It then necks down to 1/4" right at the sender. I called Walbro directly and it was them that actually recommended this to me.
Good to hear. Haven’t run mine yet but was worried about that. Thanks for the info.
 

Kane

CJ-8 Member
City
Berlin
State
ct
I don’t know if I missed it, but which fuel pump did you go with? Asking because Novak makes a drop in fuel pump module for the stock 20 gallon tank.


I am in the middle of all of this myself. I am using a 2008 aluminum 5.3 (LC9), Novak AX15 and Dana 300. I also used a PSI harness and computer.


I bought a Wablro pump and will be modifying my stock sender. I will have a write up on here after I do it for reference. I will be getting to that part in another week or two after I finished all the other mechanical work. I need to do another update to the thread this week.
 

Kane

CJ-8 Member
City
Berlin
State
ct
Here is my somewhat weekly update. I modified my DBW pedal this weekend. It took about 3hrs total and was not that hard to do. I cut off the lever, removed the plastic foot pedal and flipped the lever to swing left instead of right. I then took some time getting the angle out correct so my foot is in a comfortable position when driving. I did not need to make any special mounts after I cut up the base a little bit and shaved the little bump on the jeep body from where the stock cable used to go through.

I also finished mounting my electric fans to the radiator and buttoned up some small things on the motor. I bought an aftermarket stacked plate trans cooler and when I was under the jeep looking up at the gap between the radiator and the grill I notice two 1/4 npt ports in the bottom. Ha. I didn't even know this radiator had a cooler built in. I never used it before as it came with other parts from a few year ago and just sat in storage. Now I am debating just running with that instead of the other cooler or using both.
 

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Kane

CJ-8 Member
City
Berlin
State
ct
The shifters for both cases are all setup and functioning. This was a Muther effer of a job to get exactly correct and too far longer than it should have taken. I managed to land them in the same spots as before so my cover and boots will still work and save me a few bucks. Overall I am very happy with the setup and I hope it works well. I modified the shifter handle on the so I can used my big round knob and it just pushed down to release the lever between gears. The one supplied with the kit was terrible and had an awkward button on it. The dual stick I had before but I needed to re-bend everything for the different case angle and also still clear the trans shifter brackets.
 

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Randyzzz

Blown Budget
BENEFACTOR
Gold Member
Lifetime Member
SOA Member
City
Redmond
State
OR
Your accelerator pedal position and process is about the same as mine. I just used a spacer to clear the hump, because there’s no way I’m cutting on my freshly painted firewall. I have been finding several things that I should have fitted before paint...
 

Kane

CJ-8 Member
City
Berlin
State
ct
Your accelerator pedal position and process is about the same as mine. I just used a spacer to clear the hump, because there’s no way I’m cutting on my freshly painted firewall. I have been finding several things that I should have fitted before paint...
I don't blame you one bit on that account. They pedal still might be a bit high for my liking but time will tell. If it is then I will just tilt the whole assembly with spacers from behind the mount. I have a good 2 inches behind the pedal to the floor at full throttle and the swing is pretty long compared to the stock setup.
 

Kane

CJ-8 Member
City
Berlin
State
ct
Well after a major push these past 5 days and about 30 hours worth of work I finally got the swap done and the Jeep driving. It feels so good to have a real motor with real power. I should have just did this when I built the Jeep the first time. Now I just need to button things up like painting the engine cover, adding few more brackets for hoses and the oil cooler and I need to properly mount the computer under the dash. This swap fought me to the end with a tricky 2-1 exhaust routing and fuel issues but I finally got it running perfect. I'm running the Torque Pro app to watch all the data and the motor is burning perfectly clean now. Soo excited. The fuel system kicked the crap out of me with leaks, bad injectors, more bad injectors and 5 gallons of fuel dumped on the ground from a faulty fuel filter. The transmission didn't have 2nd or 4th gear until I found a way to fix that issue for now. I learned a lot form this swap and it is 100% worth it.

I told you all I was going to post a lot of pics but when ever I get to working on the Jeep I just zone and out and do the work. Before I know it I have things together and never touched my phone. I guess I just need to disconnect and this is how I do that. Sorry for the lack of progress updates but I can still put some updates in here on what I did during this swap. 20210517_073158.jpg
 

Ron84cj

Scrambler Junkie
Lifetime Member
City
West Bend
State
WI
Awesome! It sure is rewarding isn't it? I know what you mean about the lack of pics. I have a hard time with that too. When you get into a good rhythm it's annoying/easy to forget to break away to take pictures.
 

Kane

CJ-8 Member
City
Berlin
State
ct
So I have been driving the Jeep almost daily for the last two months and I am completely in love with my Scrambler again. I had an issue with the transmission and only had 1 and 3rd gear. Turned out the band was shot and would not hold the drum in place which is a common problem. This motor came out of a plow truck so this is not surprising to me. I drove with it for a month and got my hands on a free tranny from a friend of mine. I added the corvette servo to help with shifting and did a fluid change. This new tranny works really well. I plan to do a rebuild on my old one this winter and beef it up a bit. Right now I just need to do some small nice to haves. I need to make a good mount for the fuse block, redo the air cleaner and build a proper cold intake box, add a flex joint to the exhaust after the collector and get my driveshaft shortened.
Right now I am getting a tad over 13mpg with just backroad driving. I rarely go on the highway to work or anywhere else. I hope to get a good 100 mile highway drive in soon so I know the that as well. I put the Jeep on a scale and with the LS drivetrain it weighs 3650 pounds with a full tank of gas and no doors. I never did weigh it with the 258 so I do not know the gain or savings. All in I should have just did this when I was building he Jeep in the first place but live and learn. Now I cannot wait to drive it everyday and I know I will be packing on the miles going forward.
 
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