Finally got the 6.0. Finally. now it gets fun

[haveTBIwantLS2]

I dont think the Schoenfelds will work. Ive seen em on trucks with SAS but when I called them they told me they wont fit a 4x4. And I dont know about your truck but on mine theres a frame brace in the location where the GenIII ac compressor goes. And I have a friend that put an 8.1 in his 90 k3500 and he swapped out the cluster with one from a 92-94.

ok, no sweat on the headers.
Yah, I've been thinking about the cluster problem, and since you said that about your friend's truck I feel better.
So, it seems that the 0411's vehicle speed sensor feed from the PCM (pin C250) is 4000 ppm and is fed directly to the cluster pin B13(VSS high) [http://www.lt1swap.com/99-02_vortec_pcm.htm]. Then, the cluster sends Cruise data to the Cruise control unit on A16 and feeds the computer (old 7747) with VSS low (2000 ppm) on B16.

1991 Chevrolet K1500
Instrument Cluster Connector
34 Pin Connector

O
B Wire(s) Colors Circuit Function
17 Brown 437 ECM/PCM
16 Lt Grn/Blk&Lt Gray/Blk 822 VSS-Low
15 White 121 Gauge-Tach
14 Brown 250 Ignition & RWAL
13 Purple/White 821 VSS-High
12 White 696 RWAL
11 Black/White 450 Ground-Gauges
10 Not Used Not Used
9 Not Used Not Used
8 Not Used Not Used
7 Not Used Not Used
6 Not Used Not Used
5 Not Used Not Used
4 Not Used Not Used
3 Light Green & White 11 HeadDimSw&DRL
2 Gray 8 Fuse Block
1 Black 150 Ground
B
O


A Wire(s) Colors Circuit Function
17 Not Used Not Used
16 Red/White 818 Cruise Control
15 Yellow 237 Safety Belt Lamp/Buzzer
14 Dark Green 35 Gauge-Engine Temp Sender
13 Tan 31 Gauge-Oil Pressure Sender
12 Not Used 507 Not Used
11 Not Used Not Used
10 Light Blue 14 Turn Signals
9 Pink/Black 39 Power-Fuse Block
8 Dark Blue 15 Hazard Flashers
7 Lit Orange/Black 419 DRL Module
6 Tan/Black 592 Upshift Indicator Lamp
5 Brown/White 508 ECM/PCM-Check Engine
4 Not Used 69 Not Used
3 Brown 25 Gauge-Ammeter (Generator)
2 Tan/White 33 Parking Brake-RWAL-Brake Press
1 Purple 30 Gauge-Fuel
A

As far as the fuel pump relay, I think I'm gonna run pin C203 (Fuel relay secondary) to the B2 location of the fuel relay control circuit and pin C209 (primary) to the A1 location. My intention is to use the original 91 wiring to control the fuel pump.
I've attached a schematic (C/K truck is the lower drawing), hopefully you will spot check me on that.
It should prime, then when the oil pressure sensor gets 4 psi the primary picks up and keeps the fuel pump on.?
Those primary and secondary fuel pump feeds coming from the 0411 PCM are for priming (secondary) and running (primary), right?

I'm looking through this. Whoever made this deserves a case of beer
http://www.lt1swap.com/2000harness.htm

[haveTBIwantLS2]

About the tach... My 98 Tahoe with the 0411/L31 (4x reluctor) combo runs 1 with the Hi and Lo and the tach works like normal. I think I need to change the LQ4's tach output to 1 as well for the 91 cluster??? I'm not sure.

THe first attachment is the stock 2002 LQ4 setting, the last is the 2001 chevy express van L31 setting which I use in the Tahoe.

With pin C1 33 (TCC brake switch signal), it's gotta be pin B10 in the middle diagram..??
I think the brake pedal switch should have a wire going to the 7747, I just need to figure out which one it is and run it to the 0411 at C1 33.

[haveTBIwantLS2]

This is for the OBD 2 port. Pin 2 on the ALDL plug is pin C1 58


I know I'm posting info that a lot of guys already know, I guess I'm just kinda posting this stuff for guys who don't (like me).

[haveTBIwantLS2]

Ive seen em on trucks with SAS

workin on it!

[haveTBIwantLS2]

Well, I went through the harness today and it looks good (nothing cut, broken, etc). Also cracked open the LQ4, absolutely spotless inside. I was pretty impressed.
I'm not planning on running EGR or the Charcoal canister, so I'll be searching for some blockoff plates for that stuff.
I need to get the 4L80 rebuilt...prolly could have it done for 4 or 500 bucks if I'm lucky.
Still need
NBS radiator (34" wide)
NBS trans cooler lines
NBS rad hoses
accessory bracket bolts
LQ4 flexplate with spacer and bolts
schoenfeld headers
O2 sensors (just front 2)
belt idler/tensioner assembly
probably some other stuff.
Can anybody identify the year this 4L80 is? I think it's a post 96 because the Park/neutral switch has two plugs.





Extra bosses for another cooler??

just curious

[PitchBlackC3]

What does the bolt pattern on the bellhousing look like?

[haveTBIwantLS2]

[PitchBlackC3]

Looks 99-up GMT800 to me. The bolt hole on the top wasn't there on GMT400 stuff. Also don't think they had the 4L80e script like that on the GMT400s.

[haveTBIwantLS2]

Awesome, thanks PitchBlack.

good stuff

[haveTBIwantLS2]

I'm still cranking on this project...just getting sidetracked.
Thinking about 243 heads...not sure. I assume swapping heads on an LS engine is the same as a SBC. looks much easier, tho
I'm also thinking about throwing a 2000 rpm converter in the trans, it should help the 6.0 get over the 4L80E's nasty 1st gear.
opinions??