68 longbed 5.3/4l60e

[tallic68]

Well I called current Perf today to ask if they might be able to give me some ideas on how to track the problem down. He looked up the program he flashed my comp with and asked the code it was throwing. I said P0122. He said that that was a DBC code and then said hmmm. "I guess I overlooked the the fact that your computer didn't match your harness, in the fact the harness was DBW and ECM was DBC so I need it back to build in the code for the DBW".


So I 2 day air ups the ECM back to current this morning. I sure hope they express ship it back. This is my daily driver and I need wheels.

Tomorrow ill post up pics and a write up on the install.

Thanks everyone for your help and advice.
Mike
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[clinebarger]

Originally Posted by tallic68

Well I called current Perf today to ask if they might be able to give me some ideas on how to track the problem down. He looked up the program he flashed my comp with and asked the code it was throwing. I said P0122. He said that that was a DBC code and then said hmmm. "I guess I overlooked the the fact that your computer didn't match your harness, in the fact the harness was DBW and ECM was DBC so I need it back to build in the code for the DBW".


So I 2 day air ups the ECM back to current this morning. I sure hope they express ship it back. This is my daily driver and I need wheels.

Tomorrow ill post up pics and a write up on the install.

Thanks everyone for your help and advice.
Mike
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I just assumed 03 & up, Like LS1nova said the truck 00-02 DBW is rare....Ive only seen SUV's have it.

I am surprised the throttle works at all with a DBC tune. Ive started them with my "test" F-body 0411 PCM & the throttle doesnt work.

[tallic68]

It didn't work. It would start and idle. But no throttle response.
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[tallic68]

Well all in all the transplant went well. Major hiccup with the computer programming but it is being taken care of. Other hiccups like getting a shallow pan trans filter when I needed a deep pan, and other minor things expected from a conversion like this. All in all it went awsome.

Started Sunday morning around 9, pulling hood and front clip sheet metal. Pulling the old 350/th400 by noon.
Before....






After spending most of the afternoon cleaning and painting the crossmember trans tunnel and cab floor. I decided to test fit the new motor. To my surprise it went right in. No modification, no cursing, nothing. She just slipped right in so easily I didn't even need my wife to help out. One person job.

After......


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[tallic68]

With the engine and trans in place. I started on exhaust manifolds, fuel, trans lines, and power steering.

09 TBSS manifolds fit amazing. Plenty of clearance, no frame mods at all. Here is passenger side. Can't find the pics I took of drivers side but fit and clearance is the same.





May need to trim the frame just a bit for the A/C lines. But it won't be to much.


Walbro fuel pump and summit filter and SS lines.




Trans lines are the original lines. I used the adapters that were on the TH400. Routed them with Clarence for exhaust and then along the frame under the frame perches and under the A/C compressor. I'll need to Clarence and move the lines around a bit when I get the radiator in and trans lines hooked up to it.




For power steering I used the 2002 pressure line and the 68 flare nut. I cut the 02 flare fitting off straightened the line a bit and flared the new line. Worked like a charm. Sorry no pic at this time.
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[tallic68]

Got the drive line shortened, balanced, carrier bearing replaced and a conversion u joint to get the 4l60e yoke to fit. Fits like a glove. Trans linkage is all stock 68. I took off the linkage arm that came with the 4l60e and bolted up the TH400 linkage. Works great. A tad close but i think it will work awesome. I can even reach 1st easily. Changed the filter on the trans changed the engine oil and filter. Filled the power steering. Then I got a little antsy and decided to try and start the engine. After flushing the fuel lines and getting pressure up I tapped the cranking signal wire. It turned over. Gave it a little longer of a tap and after turning over 3-4 times blammo, fired right up. Amazing this thing sat for 3-4 month before I got and it started first try and faster than my 350 ever did. NICE!! I hooked up the TAC and pedal and fired it again. No response. I hooked up my scanner and it had just two codes. MAF sensor code and P0122. The MAF wasn't hooked up so I wasn't worried. But without being able to let the engine run I moved on.

Time for the front sheet metal.



Mounted the fuse and relay center to the fire wall next to the break booster. The TAC will be mounted just below and to the right of the fuse really center.




Moved the battery to the drivers side. Drilled the spot welds and reassembled it in mirror image of itself. Still need to take it out, finish weld it, cut off the original support bends and paint it. But I am really happy with it.


Test fit some suburban stock intake. The ducting is a little high ill have to see if it will work when I get the hood on. Not sure. The air box is a little odd shaped and I'm not sure it is gonna fit. May have to go with the spectra cold air intake I've seen many of you guys use. Really wanted the stock stuff to work cause I wanted to look as new stock as possible.

Most of what is left is under dash wiring and the front clip harness. Gotta figure out what will stay and what will go. I think most of it will go.

Mounted the 99 f body E fans to my 68 radiator and set it in place this morning. Plenty of room. I think it will work fine.

I would have never got this far this fast without you guys, this site and the LS1tech site. Thanks a lot. More to come when I get off work Sunday and can get back at it.
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