LS1 into 93 Yukon 4x4

Hi,

I've been reading the board for a while and have learned a lot, but I have a few questions about the swap I'm planning. I have a 1993 GMC Yukon 2dr 4x4 with a 350 TBI, 4l60e, NP241 transfer case and a 10 bolt rear end. I am in the process of installing a 6 inch lift kit and plan on installing 35 inch tires. I plan on using a harness and tune from farmtruc, aluminum radiator with electric fans, S&P ac compressor setup and not sure about motor mounts. Am I missing anything??

The main questions I have are if I install a LS1 and 4l60e from a camaro/firebird will my transfer case and adapter bolt to the new transmission? Will the transfer case fit in the stock location? Which would be the best year vehicle to get the donor LS1/4l60e from?


Thanks,
Tony

You can use the transmission and stuff you already have if you buy the adapter for the crankshaft. Street and Performance sells the adapter, and others sell them but I don't know who. What you could do is buy a 6.0L complete engine/trans/transfer case and drop it all in as an assembly.

I would say go 6.0L also. The cubes and tq will come in handy with a big 4x4 truck. Maybe even install a low end tq cam to help get that big truck moving.BIG 4x4 TRUCK+ BIG MOTOR= ALOT OFF MUD :laugh: :thumb:

So would the 6.0L engine/trans/transfer case be an easier swap? Which would be a good donor truck?

why use a 4l80e trans and converter? from 1999-2005 6.0L used a 80e trans other than the
SS, H2, denali, and escalade.
you should use your trucks transmission and adapt the engine to it.

airdeano

Looking at prices on EBAY the 6.0/4L60E (or 4L80E) combo isnt too bad, I think thats what Ill get! Already bought the motor mounts. :thumb:

Id like to keep my NP241 transfer case (manually shifted.) Will it bolt to the newer 4L60E/4L80E? That is what I have now but it is a 1993.

Ok, I bought a 01 6.0/4l80e and have it bolted in! Got the motor mount adapter plates off ebay and they worked great! Had to move the trans crossmember back about an inch, but that wasnt to hard. I learned that for the transfer case to bolt to the 4l80 I need a different input gear and it will fit. I think my rear drive shaft should fit, but for the front I will need a longer one or some type of spacer. I am currently working on the most challenging step in the swap.....wiring! I have a Painless harness which is making it easier, but I have a few questions hopefully someone can answer:

Can I get rid of my old (93) ECM?
Will the ABS still work, with or without old ECM?
I know I need a new fuel pump, but can I use my 93 Fuel pump relay? (it fits in the Painless harness connecter)
How do I adjust the shift linkage for the trans and t-case since everything is an inch further back?
I cant find the CKP connector on the 6.0, where is it!!

I have the lift kit installed, so this thing is getting closer to being on the road!!

I dumped my 93 PCM. Not needed so far. You need to feed the speedo sensor feedback from the transmission into the speedo box behind the glove box, it's a little white box about 2 inches square. Use the stock relay if you can. I re-used the stock relay on both my conversions. That saved me buying a $3 relay. :laugh:

Thanks Redheartbeat. Does your ABS work?

I have only rear wheel ABS and haven't tested it yet. I like the old fashioned brakes that you could lock up tight. You can scare the hell out of people locking them up. Try that with an ABS vehicle, ain't gonna happen. :laugh:

Good deal bro but dont forget about changing those gears out if your gonna go with 35s. it helps take out the strain on the rear end and tranny alot! i found out the hard way. tore up tranny first, then the rear end, then the u-joints. I had 37'' super swampers and those took 456's.

later bro

i know this ifs off the topic .. but you have been a member since 03 and you only have 5 POSTS!! when you said that you have been on board for a while i said ..DAMN since 03.. then i looked 5 posts!! im sorry was just looking at that.

Well I found the CKP sensor, had to take the starter off to find it.

I'd like to keep the ABS for safety reasons, will it work with the 6.0l ECM? I think there is only one wire from the ABS module going to the old ECM and one that goes to the front axle (not sure what that one is for??)

stevc3e...what gears did you have in that tore everything up?? I'm planning on 4.56's, but I need to get this thing up and running first.

Thanks

<div class='quotetop'>QUOTE(worm556 &#064; Apr 27 2006, 08&#58;44 AM) [snapback]51373[/snapback]</div>

Quote:

---

Well I found the CKP sensor, had to take the starter off to find it.

I&#39;d like to keep the ABS for safety reasons, will it work with the 6.0l ECM? I think there is only one wire from the ABS module going to the old ECM and one that goes to the front axle (not sure what that one is for??)

Thanks
[/b]

---

It&#39;s probably a communication line (serial data or something similar) to tell the ABS unit you are in 4WD instead of 2WD.

As far as working with the 6.0L..... maybe. A lot of wiring/communication evolves. For instance, my 93 had a vehicle speed buffer, a little white box under the dash. Tied the input wire to the output wire, and my speedo worked. Seems that function is built into the ECM now.. I can look at the wiring and make my best guess for you.

what&#39;s the wire color? I have the wiring diagrams for 93. If I had to guess from memory, it&#39;s a black/white wire, and says something like "front axle telltale feed"

<div class='quotetop'>QUOTE(RedHeartbeat &#064; Apr 24 2006, 01&#58;18 AM) [snapback]50968[/snapback]</div>

Quote:

---

I dumped my 93 PCM. Not needed so far. You need to feed the speedo sensor feedback from the transmission into the speedo box behind the glove box, it&#39;s a little white box about 2 inches square. Use the stock relay if you can. I re-used the stock relay on both my conversions. That saved me buying a &#036;3 relay. :laugh:
[/b]

---

You can take the speedo signal from the PCM, tie two leads in the buffer together, and get the speedo to work through the PCM, that&#39;s what I did. Now I can cal the speedo for axle ratio, tire size etc.. I can get the pins you need to cross if you want it. Essentially, the speedo buffer (little white box) is built into the controller now, and totally calibratable (sp? is that a real word) in the PCM.

Going from memory here, my 1993 had two white/clear connectors the connected the underhood harness with the body harness. I think the green/white wire was for the speedo signal. I tied that into my the PCM adapter harness I built, pulled two leads from the speedo buffer, and tied them together. BAM speedo worked perfect.

HTH

Beertestr: the wire is brown with a white stripe and goes from the ABS computer to front axle to the 4x4 wiring harness. It is connected to the front axle with a blue wire that goes to the old ECM.

As far as the speedometer wiring, I have the Painless harness that has a VSS Output wire from the PCM. Your saying I can connect this wire to 2 wires from the speedo buffer and it will work? What colors are the 2 wires?

<div class='quotetop'>QUOTE(worm556 &#064; May 3 2006, 10&#58;19 AM) [snapback]51920[/snapback]</div>

Quote:

---

Beertestr: the wire is brown with a white stripe and goes from the ABS computer to front axle to the 4x4 wiring harness. It is connected to the front axle with a blue wire that goes to the old ECM.

As far as the speedometer wiring, I have the Painless harness that has a VSS Output wire from the PCM. Your saying I can connect this wire to 2 wires from the speedo buffer and it will work? What colors are the 2 wires?
[/b]

---

I have to look at the wiring diagrams on the ABS brown wire question. I&#39;ll see if I can look tonight.

As for the speedo buffer dealeo, I won&#39;t have my truck back at the house for a few more days. When get it back, I will take a pic of what I did. Your truck should have a clear/white 2-row connector that the original PCM hooked into under the glove box. I want to say there is a green/white wire in that connector, which is the VSS wire. I tapped into that, and tied the two wire together at the buffer connector. I tapped in that way in order to make my harness removable, just like the factory since I am developing in a plug and play kit.

Does anyone know what wire (pin) out of the 5.3L PCM is the VSS output? I'd like to use it to run an Auto Meter Speedometer gauge and also use it to tie into the 1993 Silverado's ABS system. Thanks in advance.

Red or Green connecter pin 50 green wire with white stripe.

Great! Thanks for the quick response!