Cold fluid 47re 2nd gear starts

[Evan]

Seems to be sensor or computer related. Had a 10k machine on leaving a stop light she shudders my eyes go wide and I pull the shifter to first no change. At this point I think it's just slipping with a very light foot I get the load moving with minimal slipping.  

Ounce going I get 1upshift then lock and I stand on her roaling coal. Hunkered down and accelerating with no slipping.

It didnt hit me yet I was starting in second. 

Get where I'm going check fluid its good shut truck off . Go to lunch later no trailer truck sluggish to move then I realized it's in 2nd. Just for kicks I shut it off rolling to stop light turns green issues gone.

 

Ever since I've noticed it does do it on cold fluid. What I think is with fluid cold pressure must be high enough it's going into limp mode though no lights appear on dash wich I expected this truck never trips a service engine light. 

Another thing is I'm pretty sure overdrive indicator has changed color to a darker orange.

 

Not sure if I need a bigger resistor to mask pressure or bump back pressure a fuzz. Also not 100% sure that's what it is yet.

 

Doesn't do it ounce fluid temp starts moving the gauge at 80deg its stays under 80 for a long time.

 

Kinda just thinking outloud maybe I'm off on thinking it's in limp mode.?

 

Towing today. Fluid at 135 no issues 

 

 

 

Edited October 16, 2019 by Evan

[Mopar1973Man]

Gov press sensor and gov press solenoid. Most likely a error code for it as well. Won't trip the CEL light.

[Evan]

Dont think it's a pressure thing now. Just drove boise to mtn home and got 2nd gear start at the first light I hit. Shut it off at the second light and then it was good to go.

 

Though it could be. Fluid temp was 102.

Haven't had time to mess with it. Its annoying more than anything. 

I did think about the sensors.  They're 3 or 4 years old now. I'll check for codes.

 

Thanks for the reply I didnt realize it wouldnt trip service engine light. 

 

I do know when injection pump went out it didnt have any indications on the dash 

[pepsi71ocean]

Is this a stock auto?

 

I don't think it's a governor pressure solenoid Mike. I wonder what his front servo looks like, and I'm wondering if this is a sticking 1-2 shift shuttle. It's possible that the fluid is side loading the bore, or that the front servo piston is getting cooked.

 

 

Either way I feel like a drop off the pan is desired to check the condition of the bands and maybe drop the valve body or pull the sensors and check if the filters are clogged.

 

The reason I say this is that if he puts it into manual one he will be running on a different band pack, the face that it didn't change and drop gear means that the manual override isn't working.  

 

There aren't too many bands that are applied in one vs the other. This makes me wonder about that front servo. 

[Evan]

Pepsi

Tranny has most all the goodies I could afford for 4k

 

Just today I was thinking something might be sticking 

 

If its something sticking how come shutting the truck off and restarting resets it and itl emidatly be in first. 

 

I'm wondering about the TV valve 

 

This tranny deserves a good valve body not one that's seen 320k and just has a shift kit. Thinking hard on a dynamic replacement. 

Edited October 20, 2019 by Evan

[pepsi71ocean]

9 hours ago, Evan said:

Pepsi

Tranny has most all the goodies I could afford for 4k

 

Just today I was thinking something might be sticking 

 

If its something sticking how come shutting the truck off and restarting resets it and itl emidatly be in first. 

 

I'm wondering about the TV valve 

 

This tranny deserves a good valve body not one that's seen 320k and just has a shift kit. Thinking hard on a dynamic replacement. 

 

Try shifting it into netural then back into drive or manual 1. 

 

My guess is that sitting the truck off will also kill the fluid pump in the transmission.

 

Even if the GPS is reading high, shifting the truck into manual 1 will force the transmission into 1st gear.

[Evan]

I haven't tried neutral then to manual first.  Drive to manual 1 doesnt for a it down.

 

I noticed 2-3 shift is quicker and firmer when it starts in 2nd. Also noticed theres no rym or reason. Truck bone cold this morning first light it downshifts to first 2nd light it doesnt .

 

I'm running 100% dex3 I might dump it for +4 see if it goes away then.

 

I've got myself talked out of thinking its sensor related but like Mike said i need to check for codes. I just keep driving around it..

 

Thanks guys for the help.

[pepsi71ocean]

56 minutes ago, Evan said:

I haven't tried neutral then to manual first.  Drive to manual 1 doesnt for a it down.

 

I noticed 2-3 shift is quicker and firmer when it starts in 2nd. Also noticed theres no rym or reason. Truck bone cold this morning first light it downshifts to first 2nd light it doesnt .

 

I'm running 100% dex3 I might dump it for +4 see if it goes away then.

 

I've got myself talked out of thinking its sensor related but like Mike said i need to check for codes. I just keep driving around it..

 

Thanks guys for the help.

 

What did you mean with the bolded statement above?

 

Another test is to unplug the sensor connector at the top of the valve body. And let the valve body work in hydraulic mode. You will not have over drive, but it should start in 1st. 

 

If it doesn't then you definitely have a valve body issue.

[Evan]

I haven't tried putting it in neautral then to manual first to see if that brings it down to first gear.

 

I dont have time to work on it. Building a addition on cabin and our work truck needed attention 

Edited October 20, 2019 by Evan

[pepsi71ocean]

6 hours ago, Evan said:

I haven't tried putting it in neautral then to manual first to see if that brings it down to first gear.

 

I dont have time to work on it. Building a addition on cabin and our work truck needed attention 

 

The fluid channel is changed when you go from D-N-1 as it runs on a separate clutch pack. If you have a built trans with higher line pressures your likely to have a resistor go bad, if it is indeed line pressure related.

 

But it should still force a manual 1 shift.

[Evan]

It will sometimes force a manual 1 shift with a a delay after moving it into manual 1

 

Then shut truck off restart and itl shift normally downshifting slowing to lights and up shift from first with selector in drive. 

Its wheeeerd 

Had a few minutes so pulled codes reading off odometer. 

 

P0622 field circuit

P1763 Gov pressure sensor

 

These two could be relate I think I dunno.

 

Also have a 1765 maybe caused by smarty and boost fooler 

 

Hmmm

 

Further reading I've found 1765 is the 12v transmission relay circuit 

Edited October 21, 2019 by Evan

[pepsi71ocean]

Time to drop the pan and look, I bet you there GPS is failing.

[Evan]

Yes it may be. I didnt expect trouble codes.

Looking into upgrades. It currently has the borg sensor its about 3years old

 

Is this a worth while 200 bucks.  I run about 150 psi

Edited October 23, 2019 by Evan

[pepsi71ocean]

I have the borg Warner one and the stock block and I have head mine for a while. I think the upgraded ones are worth it

[Evan]

Today it never did it. I may order the upgraded one with housing anyways. Its probly got 10-15k on fluid anyways so it's about time to drop the pan.

 

I cant decide if the GM sensor is better but I do like the 4l6e and 8e trannies so maybe it's an upgrade 

[Evan]

Did some calling around looking for the upgraded manifold and sensors in the boise area.

It appears idaho transmission warehouse might have the ats version and priced right inline with online prices.

 

If it's what I'm looking for I'll grab it.  Want to fix this 2nd gear starts before I do turbo and possibly push alittle more power through it.

[pepsi71ocean]

Let me know how it works out for you.

[Evan]

Itw did have dnj manifold. 

Guy was impressed I knew the 2000 up 47re upgrade had the  GM gov sensor and not standerd borg upgrade. 

 

I did buy it but along with a trancducer.

 

I asked about parts they stock and was impressed by the list of billett upgrades and sun coast parts they had.

 

Told them this is first part I've bought locally to upgrade anything on my truck.

I really was impressed you literally cznt buy anything locally 

 

Anyway I hope it fixes my inter mitten problem.  Either way it's an upgrade I've considered doing before. 

 

 

[pepsi71ocean]

I've been told that the BW upgraded one is better then the GM conversion, but I dono.

[Evan]

I thought I read that to the bor was better. But when I research it I find no info backing up or disproving one is better than the other.  This is how most topics I research go mumble jumble.

 

The gm is considered the heavy duty but only offerd for 2000 up not sure what if any difference there is since I currently have a borge plugged in mine

 

I do know that the 4l8e transmission works very well as I have about 6 years experience driving mine and servicing a fleet of trucks with them. 

 

Headed to work today I got a 3rd gear start. Moving lever to manual 1 forced it to second.

 

I'm skeptical the gm senor and transducer fixes my issue but then I'll at least know they're out of the equation.