'01 Duramax Drivetrain issues

[jeep_87_cherokee]

ok it seems i have hit the wall on whats wrong with my truck. it all started when i blew the rear drive shaft and the yoke fell out also.

its a '01 Chevy 2500HD 4x4, Duramax, Alison

the thing is i got a new steel drive shaft and the stock yoke, i turned on the truck drove twenty feet and the dash lit up like a christmas tree, SES light ABS light and Parking Brake light. the speedometer was NOT showing any speed also the tranny would NOT shift out of first gear and it was shifting itself into neutral when my shifter was in the drive position. so i hooked up a scanner and it was showing a speedometer sensor error and that was making a transmission fault error. i clear the codes and replaced the sensor before starting the truck again. i went to try driving it and the same shit was going on like nothing changed.

the funny thing is this has happened to me before in may and it was doing the same thing, threw the same codes and i replaced the sensor and it ran PERFECT.

has anyone experienced this or has any advice, help me Pirate

[trkklr77]

seeing as how there is upto 3 vss built into your tcase and the comp relies on them to fuel and abs/brake accordingly the lack of signal from the rear one[s] could cuase some issues.


first off, did you check the tcase to see if it had fluid in it? metal flake/shrapnel?

the cases are renound for poking a hole in the side, barfing the oil out the eating the guts up.

they will also shit the rear output bearing and the seat in the case which could cuase the tone ring to fall away from the sensor.

[dahoyle]

Originally Posted by jeep_87_cherokee

the funny thing is this has happened to me before in may and it was doing the same thing, threw the same codes and i replaced the sensor and it ran PERFECT.

has anyone experienced this or has any advice, help me Pirate

My guess would be the sensor alignment may be off some. Not sure how they are threaded in, but chances are, it's too far from the tone ring. All it is, is a magnetic proximity sensor, with proximity being the key word. Has to be close enough to the reluctor to work.

[Mh4Runner]

Trklickr hit the nail on the head. Pull the t-case and inspect everything very carefully. A problem with a 261/263, if not caught early, is a huge money problem.

New case rear case halves and a bearing kit are reasonably priced, if you need them, let me know.

[trkklr77]

246's also....

[DieselS10]

If that rear VSS in the tailhousing of the transfer isn't reading properly it will immediately kick it into limp mode and won't shift out of 1st gear.

[jeep_87_cherokee]

Ok fixed it and what a bitch I'll fill you in later. I cant believe I got this lucky in finding it

[DTL]

update??

[supersize75k5]

Originally Posted by Mh4Runner

Trklickr hit the nail on the head. Pull the t-case and inspect everything very carefully. A problem with a 261/263, if not caught early, is a huge money problem.

New case rear case halves and a bearing kit are reasonably priced, if you need them, let me know.

How much is this?


I just bought a 07 classic lbz, and would like to not get slapped with the common failure.

-shawn

[jeep_87_cherokee]

ok this little plug was my issue! One damn wire kept my truck from shifting. Both wires were attached to the harness when I was scoping out the truck. I checked out the t case and speedo sensor and tone ring everything seemed in place so I started checking everywire attached to the tranny, and I don't even know what it goes to but I seen it was danger close to the front yoke and when I looked closer the orange rubber insulater in the rear of the plug was slightly pulled out and I had that, " this ain't right" feeling. My old man was sitting back watching and was like I bet that purple wire is broke on the inside, so he set the beer down, got off his ass and pinched the wire with his fingers and the wire broke in two, he said yup it was. So about then it was 830 last night and he was telling me I needed a new plug. I started digging through my stash of parts and BAM! I found a plug! It's the coolant temp sensor plug off a chevy TBI setup, so I spliced it in sealed it up with some heat shrink. After that I hopped in the dirty d and went flying down the street gear after gear!

[jeep_87_cherokee]

Here's another thing that pissed me off in this ordeal. This is the speedo sensor that goes in the t case. And as someone already said this sensor only works when the proper gap is between the tip of the sensors and the tone ring on the output shaft. I just think it fucking stupid that something that relies on thousandths of an inch has a o ring on it, now hang with me for a second, I know the o ring is there to seal off fluid from exiting the case. But as you tighten the stuipid plastic housing of the sensor with a 19mm socket. The o ring compresss thus changing the distance from the sensor to the tone ring, now I'm sure GM has certain torque specs, but they should have designed it differently. Oh well it runs like a striped ass ape now so I guess I gotta give stucky his YJ back

[trkklr77]

that oring does not go and should not be between the case and the shoulder of the sensor. in the proper position the shoulder of the sensor is hard against the case.

[trkklr77]

Originally Posted by supersize75k5

How much is this?


I just bought a 07 classic lbz, and would like to not get slapped with the common failure.

-shawn

if you install the steel plate yourself... $100 for the plate and fluid.

if you install the universal case half [246/261/263] $220 ish with fluid.

if you have a shop install either.... $300-400 labor depending on shop rate.


YOU MUST and there is no way around it, MUST remove the tcase to do it.

i did a write up on it about 6months ago.

[supersize75k5]

Originally Posted by trkklr77

if you install the steel plate yourself... $100 for the plate and fluid.

if you install the universal case half [246/261/263] $220 ish with fluid.

if you have a shop install either.... $300-400 labor depending on shop rate.


YOU MUST and there is no way around it, MUST remove the tcase to do it.

i did a write up on it about 6months ago.

Ill look for your write up, I am aware of the problem, and became annoyed/amazed with how many duramax owners called me when I listed the 263 out of my gas hd for sale for under a hundred.

[bushauler]

Originally Posted by jeep_87_cherokee

ok this little plug was my issue! One damn wire kept my truck from shifting. Both wires were attached to the harness when I was scoping out the truck. I checked out the t case and speedo sensor and tone ring everything seemed in place so I started checking everywire attached to the tranny, and I don't even know what it goes to but I seen it was danger close to the front yoke and when I looked closer the orange rubber insulater in the rear of the plug was slightly pulled out and I had that, " this ain't right" feeling. My old man was sitting back watching and was like I bet that purple wire is broke on the inside, so he set the beer down, got off his ass and pinched the wire with his fingers and the wire broke in two, he said yup it was. So about then it was 830 last night and he was telling me I needed a new plug. I started digging through my stash of parts and BAM! I found a plug! It's the coolant temp sensor plug off a chevy TBI setup, so I spliced it in sealed it up with some heat shrink. After that I hopped in the dirty d and went flying down the street gear after gear!

is that plug with the broken wire off of the nuetral saftey back up switch? that went bad on my fil's truck and did pretty much the same thing as you described.

[trkklr77]

Originally Posted by supersize75k5

Ill look for your write up, I am aware of the problem, and became annoyed/amazed with how many duramax owners called me when I listed the 263 out of my gas hd for sale for under a hundred.

yeah, i forgot to mention an rebuilt case is around $1600........

[trkklr77]

Originally Posted by bushauler

is that plug with the broken wire off of the nuetral saftey back up switch? that went bad on my fil's truck and did pretty much the same thing as you described.

no, its one of the 2-3 vss sensor plugs.

depending on exactly which tcase you have 246/261/263 [pickups burbs and tahoes] 149 [tahoe, denali, awd only] they can have up to 3 vss's.

1 for the front output, at least 1 for the rear and maybe a second.


look at any one of your cases and you will find both bosses on the outside.


on the inside a 261/263 has the shift fork guide rod in one boss but the 246 has it in the other, nvg only machines the one needed for the application. the aftermarket alum half has both machined out and all 3 vss bosses tapped and ready.