Project: 1995 s10 SAS

[Baggey22]

PICTURES!!!
As promised here are the pictures from yesterday.

A few poser shots before getting on trail:



Then on trail:




Poser flex shots:



Me being . . . . well me:

[96superflow]

i love those LTBs. I was actually thinking to myself a few hours ago that i would like to see some more pics of your truck with them. and whaaala here they are!! Looks like its holding up well, atleast 4hi.

[Donahue]

there is a bolt that holds in a spring and then the detent pin. this could cause the fluid to pour out.

[pjg1173]

Rebuild the t-case yourself. Its not hard at all. Just make sure you keep things in order. I thought that they were difficult until I took one appart recently. The np231 and 241 are quite simple.

[Baggey22]

Quote: Originally Posted by Donahue

there is a bolt that holds in a spring and then the detent pin. this could cause the fluid to pour out.

Yup, that's the bolt I sheared off. There was the bolt head, a long skinny spring, and what resembled a bullet casing laying in a puddle when we looked.

Quote: Originally Posted by pjg1173

Rebuild the t-case yourself. Its not hard at all. Just make sure you keep things in order. I thought that they were difficult until I took one appart recently. The np231 and 241 are quite simple.

As for a rebuild I think I will do that, AFTER I get a new case. I have a lead on a "12 pack priced" one in New Hampshire. He's got an 88 Blazer with a small block and SAS. Idk what case he's upgrading to but he said I could have his 231C. So we'll see how that pans out.

[ChrisInVT]

Quote: Originally Posted by BillaksBlazer

you probably burned up the bearings inside the t case. get a new one.

This is why you should bring extra fluids with you, and something to patch a small hole.

[Donahue]

i bring 2-3 gallons of ATF with me and 1-2 gallons of gear oil. it has saved me a few times.

[Baggey22]

Fluid I had. . . hole patch kit I didn't have.

[ChrisInVT]

Quote: Originally Posted by Baggey22

Fluid I had. . . hole patch kit I didn't have.

JB Weld

[Baggey22]

The transfer case isn't a huge problem, all I need is a new one which is simple.
My biggest issue now is getting it to shift OUT of 1st when I'm in 4LO. I've been trying to find pin readout diagrams for a bit but I'm having no luck. I checked both my Haynes manuals but no dice. Anyone have an idea of how to figure out the diagram for this:

[t01blaze]

there sure are a lot of wires going to that module, i dont think its your tccm. it may be located somewhere else on your truck since its older than mine....

if you can find the 4 low wire on your PCM, you may want to tie in there instead.

[pjg1173]

you might be able to find the wire you need to short on the plug that used to be connected to your T-case. Are you sure it's in 1st gear and not second? When in 4Lo I only get 1st and 2nd. When I had mine out last weekend the way it drove it felt like it was in first, if it wasn't for the shift kit in my trans i i don't think I would have noticed it going into second.

[t01blaze]

Quote: Originally Posted by pjg1173

you might be able to find the wire you need to short on the plug that used to be connected to your T-case.

from what i understand...

#1.)the pushbutton on the dash sends a signal to the TCCM for the selected range 2hi, 4hi, 4lo.

#2.)the TCCM shifts the encoder motor to the proper position.

#3.)after the TCCM shifts the encoder motor to 4 lo, the TCCM also completes a circuit to ground on the black/gray wire. this wire goes from the TCCM to PCM and the PCM "sees" the grounded circuit and changes the shifting characteristics of the transmissoin accordingly.

if i could not find the TCCM location, I would go back to the PCM and find the wire and just run the wire back into the cab like you wanted to do before.

[t01blaze]

like this

[Baggey22]

Quote: Originally Posted by pjg1173

you might be able to find the wire you need to short on the plug that used to be connected to your T-case. Are you sure it's in 1st gear and not second? When in 4Lo I only get 1st and 2nd. When I had mine out last weekend the way it drove it felt like it was in first, if it wasn't for the shift kit in my trans i i don't think I would have noticed it going into second.

I'll have to look into that, you think that it'll be the same gray/black wire?
I know it won't shift out of first. I'd be happy as a pig in shit if I could just get into second. Because sometimes on flat parts of trail where there's nothing more than a pebble I have to crawl cause I'm revving at like 3 grand doing 4mph cause it won't shift up.

Quote: Originally Posted by t01blaze

like this

That is an OBDII readout. Remember that my motor (and maybe transmission) is from an OBDI truck. So I don't know where the TCCM or PCM or anything actually are

[pjg1173]

another thing to look at is gear to tire size ratio. the vehicle shifts based off of the the VSS. I know with my gear ratio (geared too low) my shift points are way too early. when in 2hi my truck shifts to 2nd at 5 mph unless i put the skinny pedel through the grill. my speedo reads about 15 mph too fast. before i regeared the truck my shifting would be delayed i'd have to be doing about 30 to get to 2nd. I assume you have the same electronics as my truck since you have the pre ODBII. I have read that the VSSB can be changed by soldering some jumpers to it to compensate for the gears, and move your shift points back to stock. I do believe however, there must be something telling the computer that you are in 4lo. It must be different for our trucks vs an ODBII truck. I would like to figure out how to disable mine so I can get more than just 2nd gear when in 4lo. Still searching...

[pjg1173]

check this out: http://www.dieselplace.com/forum/sho....php?p=3270359

"The customer selects 4WD-low by pressing the appropriate selector button (figure 2). This signals the TCCM of the drivers desire to engage the 4WD-low range. The TCCM engages the transfer case in 4WD-low, and also signals the PCM or VCM of its intentions by grounding pin C-1 of the TCCM. Grounding this pin drops the voltage on circuit 1694 to near zero volts at the 4WD-low input to the PCM (or VCM)"

"When the PCM or VCM 4WD-low input signal (circuit 1694 or 1493) is high (approximately 12 volts) the computer will assume the truck is in a range other than 4WD-low and will command the shift points based on the truck being in 4WD-high or 2WD-high. If the truck is really in four-low, the upshifts will be late for the given throttle opening. In addition, the truck will exhibit overly sensitive forced throttle downshifts.
In each case the truck will exhibit conditions which will be objectionable to the customer, but will not set any trouble codes (1993-1995 models)."

[t01blaze]

http://www.s10forum.com/forum/f62/an...agrams-253143/

maybe you should ask this guy for a wiring diagram...

[Baggey22]

Quote: Originally Posted by pjg1173

another thing to look at is gear to tire size ratio. the vehicle shifts based off of the the VSS. I know with my gear ratio (geared too low) my shift points are way too early. when in 2hi my truck shifts to 2nd at 5 mph unless i put the skinny pedel through the grill. my speedo reads about 15 mph too fast. before i regeared the truck my shifting would be delayed i'd have to be doing about 30 to get to 2nd. I assume you have the same electronics as my truck since you have the pre ODBII. I have read that the VSSB can be changed by soldering some jumpers to it to compensate for the gears, and move your shift points back to stock. I do believe however, there must be something telling the computer that you are in 4lo. It must be different for our trucks vs an ODBII truck. I would like to figure out how to disable mine so I can get more than just 2nd gear when in 4lo. Still searching...

I actually took my buddy's TomTom GPS when I first put the 34s on and checked to see how far off my speedo was. Come to find out my speedo is like 99% accurate. It's only like one or two miles per hour off when I checked at 30, 40, and 50mph.

Quote: Originally Posted by pjg1173

check this out: http://www.dieselplace.com/forum/sho....php?p=3270359

"The customer selects 4WD-low by pressing the appropriate selector button (figure 2). This signals the TCCM of the drivers desire to engage the 4WD-low range. The TCCM engages the transfer case in 4WD-low, and also signals the PCM or VCM of its intentions by grounding pin C-1 of the TCCM. Grounding this pin drops the voltage on circuit 1694 to near zero volts at the 4WD-low input to the PCM (or VCM)"

"When the PCM or VCM 4WD-low input signal (circuit 1694 or 1493) is high (approximately 12 volts) the computer will assume the truck is in a range other than 4WD-low and will command the shift points based on the truck being in 4WD-high or 2WD-high. If the truck is really in four-low, the upshifts will be late for the given throttle opening. In addition, the truck will exhibit overly sensitive forced throttle downshifts.
In each case the truck will exhibit conditions which will be objectionable to the customer, but will not set any trouble codes (1993-1995 models)."

Part of my problem is I don't know where any of my PCM or VCM or any of that stuff IS in the truck. Plus I don't 100% know what all those abbreviations mean. . . .

I was thinking. The harness that USED to plug into my transfer case (the NP233), would that have the gray/black wire that I need to ground out? Cause I could just splice into that and run a REALLY long wire into the cab. A little bit of a pain but WELL worth it.

[t01blaze]

Quote: Originally Posted by Baggey22

I was thinking. The harness that USED to plug into my transfer case (the NP233), would that have the gray/black wire that I need to ground out?

i dont think so...but ive been wrong on almost everthing else so far on your truck .

i think you need to find a wiring diagram and a componet location diagram like alldata would have

[Baggey22]

I'd ask that guy, but I'm not exactly sure what to ask for. Then once I get it idk how to READ it. Like that diagram you posted a day or two ago, doesn't mean a whole lot to me.

[t01blaze]

fine, i asked him for schematics, component location diagrams, and connector pinouts for the PCM, TCCM, and encoder motor.

When he gets me the info ill post it here and we'll discuss what to do to fix it

[t01blaze]

heres where everything is located, but no figure 1 was in the .pdf file (no picture) i have schematics also what engine code do you have? vin z or w?

i gotta look through a lot of pages of diagrams, but i will post the schematics later when i find them

[t01blaze]

vin z and w schematics are the same for the 4wd system, so nevermind...

heres where the tccm sends the signal to the pcm for the 4wd low range(connector c, pin #1, circuit #1694, gray/black color wire):




and heres where the pcm picks up the signal from the tccm for 4wd low(connector f, terminal 8, circiut # 1694, gray/black color wire):




this is the wire you are after, and i hope you can find either one of your pcm or tccm module locations on your truck. All you have to do is find one of the modules, and tie circut 1694 (gray/black wire) to ground when you want 4 low. i hope this helps you...

[t01blaze]

here is my photobucket if you cannot see the diagrams... it might be easier to download the pics instead...

http://s651.photobucket.com/albums/uu235/t01blaze/

[Baggey22]

I'm not sure which motor I have, I also don't have time TODAY to check the VIN cause I'm going away for the weekend. I do have a picture OF the motor itself so maybe someone else can verify if it's a VIN Z or W.
Thanks for all the help t01Blaze, I really appreciate it.

[Baggey22]

wow, posted this before you posted those diagrams.
Those are TINY. Well the print is. Like I said I'm going away for the weekend so I'll have to look into this later, Thanks

[Chevtech]

Should be a vin Z. Z is TBI and W is CPI.

[ChrisInVT]

Quote: Originally Posted by Baggey22

I actually took my buddy's TomTom GPS when I first put the 34s on and checked to see how far off my speedo was. Come to find out my speedo is like 99% accurate. It's only like one or two miles per hour off when I checked at 30, 40, and 50mph.

That's because you "upgraded" to 4.10's when you swapped axles. You just got lucky that the gearing was correct

Quote: Originally Posted by Chevtech

Should be a vin Z. Z is TBI and W is CPI.

Not necessarily true. Remember, that motor was out of a Blazer. Like I've told him a bunch of times before, he really needs to talk to the PO of the truck and find some shit out about it.


Adam, if you want to one day; drive out this way and we'll get that shit fixed.

[Baggey22]

What are you doin this weekend? If I can get my new transfer case from Laconia and get it in some time this week I can come see you Saturday or Sunday.

[ChrisInVT]

Quote: Originally Posted by Baggey22

What are you doin this weekend? If I can get my new transfer case from Laconia and get it in some time this week I can come see you Saturday or Sunday.

I'll be at my putting around dicking with my cars, nothing too special

[pjg1173]

Thats some good info to have around. Yep thats a "Z" motor ever heard of simple green and a pressure washer?

[Baggey22]

Quote: Originally Posted by ChrisInVT

I'll be at my putting around dicking with my cars, nothing too special

Alright, I'll let you know as the weekend gets closer

Quote: Originally Posted by pjg1173

Thats some good info to have around. Yep thats a "Z" motor ever heard of simple green and a pressure washer?

Why would I need simple green and a pressure washer? haha

[Baggey22]

Anyone have any other ideas of WHERE my TCCM and/or PCM might be hiding in my truck?
I've shown you (on the previous page) what's under my passenger side kick panel, and that's not either one of them.
And another picture form the previous page, I don't have the PCM in the engine bay like the other trucks.
So anyone have any ideas of where to look?

[DieselS10]

I'm getting in this a little late, but as pjg1173 mentioned above about soldiering in the dip switches into the VSSB, it works great. I did that with mine and I can set the speedometer anywhere I want it.

[Baggey22]

My speedometer is fine. I changed the gearing and tire size and it's 99% accurate

[pjg1173]

Look in t01blaze earlier post. the TCCM is behind the dash to the right of the instrment cluster and the PCM is behind the dash to the right side of the truck.

[Baggey22]

Anyone have a picture of the TCCM? I don't know what it looks like (it could be either the 93 or 95 truck. . . so both would help if they're different)

[95BlazerLT4wd]

im pretty sure all 1995's came with the cpi motor.

[Baggey22]

Quote: Originally Posted by 95BlazerLT4wd

im pretty sure all 1995's came with the cpi motor.

That may be true, BUT as previously stated my truck doesn't have it's original motor. It has a motor from a 1993 Blazer.

[jwglover]

Quote: Originally Posted by Baggey22

That may be true, BUT as previously stated my truck doesn't have it's original motor. It has a motor from a 1993 Blazer.

I thought my 93 has the PCM behind the glove box, it ahs been so long since I had to look for it,,, try there if you havent already looked.

[ChrisInVT]

Quote: Originally Posted by Baggey22

That may be true, BUT as previously stated my truck doesn't have it's original motor. It has a motor from a 1993 Blazer.

You need to put that in your sig so people stop assuming...

[pjg1173]

according to autozone for a 95 S10 4x4:
Available engines

• 6 Cylinders W 4.3L CPI (found in 39% of 1995 Chevrolet S10 P/U 4WD)
• 6 Cylinders Z 4.3L TBI (found in 61% of 1995 Chevrolet S10 P/U 4WD)

[ChrisInVT]

I don't mean to be a dick here, but does anybody ****ing read? Seriously?

Adam's truck has had *GASP* a motor swap! The motor in his truck IS NOT THE ORIGINAL MOTOR, it's from a 1993 BLAZER.

[95BlazerLT4wd]

chill the fvck out i wasnt saying his truck had a 1995 motor i was just stating that i thought all 95's came from the factory with cpi

[ChrisInVT]

Well what was the purpose of your post then? Everybody knows that. It's been discussed several times in this thread.

[Baggey22]

I looked for the PCM/TCCM today with no luck. I pulled all three panels from under the dash (the black ones) and didn't see anything. I also emptied out the glove box but also found nothing. I also checked the old plug that USED to go to the NP233 and that had no grey/black wire coming from it.
Not really sure where else to look. . .

[wrekd]

Try calling a dealership. Im sure they would know.

[dball]

Why cant you follow the engine harness back to the computer?

[Baggey22]

I'm not sure what you mean by "follow the engine harness back to the computer"
From what Chris said on a previous page I found my ECM, but I'm looking for the PCM/TCCM