Transmission Guru's

WTFWSAT · 10-05-2011, 06:52 PM

My dad has a 2500 hd 6.0 gas with i think a 4L80E (not positive) that just today started shifting hard. Truck just turned 100,000 miles completely stock. Trans temps looked normal on the gauge, we were just driving normal not towing anything.

The 1-2 shift will make you think the truck has a shift kit, 2-3 isnt quite so bad but its pretty noticeable. Fluid level was checked and to me it looked higher than normal.

There is a check engine light on but i dont have a scanner to check it. I will tomorrow.

Any ideas? PM me if you want.

Thanks

yota · 10-05-2011, 07:07 PM

needs a new engine, trans, and transfer case... i dont see any other way to fix it... and to offer what help i can, i will take the stuff you remove to get it out of your way

BAD BOB · 10-05-2011, 07:12 PM

sounds like something is not right. i would say it is going full line pressure for some reason. maybe check the front tire pressure to make sure its not making all the fluid run foward if they are low. if thats not the issue i would say time for a new trans!

WTFWSAT · 10-05-2011, 07:13 PM

Quote:

Originally Posted by yota

needs a new engine, trans, and transfer case... i dont see any other way to fix it... and to offer what help i can, i will take the stuff you remove to get it out of your way

I knew someone was gonna come with something like that! lol

WTFWSAT · 10-05-2011, 07:17 PM

Quote:

Originally Posted by BAD BOB

sounds like something is not right. i would say it is going full line pressure for some reason. maybe check the front tire pressure to make sure its not making all the fluid run foward if they are low. if thats not the issue i would say time for a new trans!

Thats a good assumption, Actualllly the front tires were flat to the ground when we checked the fluid.....had to let the air out so we could reach the dipstick!

bwelch · 10-05-2011, 07:18 PM

Here is an idea! Put the lentech in the 2500 and buy a glide for the stang....

WTFWSAT · 10-05-2011, 08:04 PM

Quote:

Originally Posted by bwelch

Here is an idea! Put the lentech in the 2500 and buy a glide for the stang....

haha, im pretty sure dad doesnt want to manually shift anymore.

gearmesh, inc. · 10-05-2011, 08:28 PM

A lot of times when a transmission code is set due to an electrical issue in the transmission electronics, the strategy is to go to maximum line pressure as a failsafe to try to keep the trans from self destructing. Chances are, the PCM/TCM has seen an electrical fault of some sort and has flipped to failsafe mode. Shifts will definitely firm up when that happens.

MonteC · 10-05-2011, 08:49 PM

What Gerald said.

Commonly ive seen bad knock sensors play havoc with the hd trucks. But the problem could be any number of electrically related parts. First order of business is to find out what SES code you have.

WTFWSAT · 10-06-2011, 02:54 PM

Thanks guys,

I had the code pulled today and it was a P0894 Trans componet Slipping. We cleared the code and i drove it for about an hour after and it hasnt acted up again, but the temp only got to about 150 where as yesterday it happened @ 170*.

And according to the trans pan its a 4L80 it has 17 bolts.

Is this something easy to fix or is he looking at an entire overhaul?

Thanks

Silver-Dollar · 10-06-2011, 06:59 PM

tow/haul button pushed?

WTFWSAT · 10-06-2011, 07:33 PM

No, the tow haul is off.

I drove the truck to work tonight and after about 15 miles it started shifting hard again. Trans temp was still about 150*. The check engine light hasn't come back on yet.

gearmesh, inc. · 10-06-2011, 07:40 PM

With that code and 100,000 miles, it could very well be time to open it up.

WTFWSAT · 10-06-2011, 09:17 PM

Thanks, Ill see what he wants to do with it.

MonteC · 10-06-2011, 10:11 PM

The lock up clutch is slipping. The computer will watch as the RPMs are too high after lock up is commanded. Clearing the code will like you found out put everything back to normal until the computer sees the problem enough times to set the code. Also that code may not illuminate the SES light.

If he isnt ready to rebuild the trans, id start with the valvebody and solenoid. Easy to get to. If that doesnt work then youd have to pull out the trans, you could gamble on a new torque converter, or just go ahead with the rebuild and replace the converter along with the fresh trans.

WTFWSAT · 10-06-2011, 11:17 PM

Thanks Rob,

Anything special about pulling the valve body off? Am i looking for worn o-rings/pluggage?

Im sure he doesnt want to rebuild it just yet so ill try this first.

MonteC · 10-07-2011, 07:36 AM

vb is pretty simple, the check balls will fall out but I have plenty of diagrams for the locations and a little petroleum jelly will stick them back into place. The vb will come down complete, no spring flying around. Ill try and send you a couple diagrams with the problem areas today.

WTFWSAT · 10-07-2011, 08:49 AM

Quote:

Originally Posted by MonteC

vb is pretty simple, the check balls will fall out but I have plenty of diagrams for the locations and a little petroleum jelly will stick them back into place. The vb will come down complete, no spring flying around. Ill try and send you a couple diagrams with the problem areas today.

Awesome Thanks!

10-05-2011, 06:52 PM	#1
WTFWSAT Senior Member Join Date: Nov 2007 Location: Summerville Posts: 861	Transmission Guru's My dad has a 2500 hd 6.0 gas with i think a 4L80E (not positive) that just today started shifting hard. Truck just turned 100,000 miles completely stock. Trans temps looked normal on the gauge, we were just driving normal not towing anything. The 1-2 shift will make you think the truck has a shift kit, 2-3 isnt quite so bad but its pretty noticeable. Fluid level was checked and to me it looked higher than normal. There is a check engine light on but i dont have a scanner to check it. I will tomorrow. Any ideas? PM me if you want. Thanks __________________ Fastest stock computer 5.0 on the planet! Looking for cheeep msd 6al! PM me! 88 Coupe (turtle) 03 Cobra (tortoise)

10-05-2011, 07:07 PM	#2
yota Senior Member Join Date: Jun 2011 Location: Va Posts: 1,049	needs a new engine, trans, and transfer case... i dont see any other way to fix it... and to offer what help i can, i will take the stuff you remove to get it out of your way __________________ 1999 Trans Am 2007.5 Dodge Mega Cab Cummins

10-05-2011, 07:12 PM	#3
BAD BOB Senior Member Join Date: Mar 2008 Location: SUMMERVILLE Posts: 3,681	sounds like something is not right. i would say it is going full line pressure for some reason. maybe check the front tire pressure to make sure its not making all the fluid run foward if they are low. if thats not the issue i would say time for a new trans! __________________ IM BAD BOB

10-05-2011, 07:18 PM	#6
bwelch Senior Member Join Date: Aug 2009 Posts: 3,774	Here is an idea! Put the lentech in the 2500 and buy a glide for the stang.... __________________

10-05-2011, 08:28 PM	#8
gearmesh, inc. creepy azz cracka Join Date: Nov 2008 Location: Summerville Posts: 1,587	A lot of times when a transmission code is set due to an electrical issue in the transmission electronics, the strategy is to go to maximum line pressure as a failsafe to try to keep the trans from self destructing. Chances are, the PCM/TCM has seen an electrical fault of some sort and has flipped to failsafe mode. Shifts will definitely firm up when that happens. __________________ "I came into this world kicking, screaming,and covered in someone else's blood, I have no problem leaving the same way!" ÔÇ£If you carry a gun, people will call you paranoid. ThatÔÇÖs ridiculous. If I have a gun, what in the hell do I have to be paranoid about?ÔÇØ -Clint Smith, Thunder Ranch.

10-05-2011, 08:49 PM	#9
MonteC Senior Member Join Date: Oct 2009 Location: Summerville Posts: 4,431	What Gerald said. Commonly ive seen bad knock sensors play havoc with the hd trucks. But the problem could be any number of electrically related parts. First order of business is to find out what SES code you have. __________________ Griffin Transmission -Home of the most badassest Monte Carlo- Cell: 843-276-0554 Shop: 843-793-4607 04 RSX 06 Ridgeline 86 Monte Carlo

10-06-2011, 02:54 PM	#10
WTFWSAT Senior Member Join Date: Nov 2007 Location: Summerville Posts: 861	Thanks guys, I had the code pulled today and it was a P0894 Trans componet Slipping. We cleared the code and i drove it for about an hour after and it hasnt acted up again, but the temp only got to about 150 where as yesterday it happened @ 170*. And according to the trans pan its a 4L80 it has 17 bolts. Is this something easy to fix or is he looking at an entire overhaul? Thanks __________________ Fastest stock computer 5.0 on the planet! Looking for cheeep msd 6al! PM me! 88 Coupe (turtle) 03 Cobra (tortoise)

10-06-2011, 06:59 PM	#11
Silver-Dollar Senior Member Join Date: Jun 2008 Location: Summerville Posts: 1,019	tow/haul button pushed? __________________ 2011 Tundra Crewmax Platinum

10-06-2011, 07:33 PM	#12
WTFWSAT Senior Member Join Date: Nov 2007 Location: Summerville Posts: 861	No, the tow haul is off. I drove the truck to work tonight and after about 15 miles it started shifting hard again. Trans temp was still about 150*. The check engine light hasn't come back on yet. __________________ Fastest stock computer 5.0 on the planet! Looking for cheeep msd 6al! PM me! 88 Coupe (turtle) 03 Cobra (tortoise)

10-06-2011, 07:40 PM	#13
gearmesh, inc. creepy azz cracka Join Date: Nov 2008 Location: Summerville Posts: 1,587	With that code and 100,000 miles, it could very well be time to open it up. __________________ "I came into this world kicking, screaming,and covered in someone else's blood, I have no problem leaving the same way!" ÔÇ£If you carry a gun, people will call you paranoid. ThatÔÇÖs ridiculous. If I have a gun, what in the hell do I have to be paranoid about?ÔÇØ -Clint Smith, Thunder Ranch.

10-06-2011, 09:17 PM	#14
WTFWSAT Senior Member Join Date: Nov 2007 Location: Summerville Posts: 861	Thanks, Ill see what he wants to do with it. __________________ Fastest stock computer 5.0 on the planet! Looking for cheeep msd 6al! PM me! 88 Coupe (turtle) 03 Cobra (tortoise)

10-06-2011, 10:11 PM	#15
MonteC Senior Member Join Date: Oct 2009 Location: Summerville Posts: 4,431	The lock up clutch is slipping. The computer will watch as the RPMs are too high after lock up is commanded. Clearing the code will like you found out put everything back to normal until the computer sees the problem enough times to set the code. Also that code may not illuminate the SES light. If he isnt ready to rebuild the trans, id start with the valvebody and solenoid. Easy to get to. If that doesnt work then youd have to pull out the trans, you could gamble on a new torque converter, or just go ahead with the rebuild and replace the converter along with the fresh trans. __________________ Griffin Transmission -Home of the most badassest Monte Carlo- Cell: 843-276-0554 Shop: 843-793-4607 04 RSX 06 Ridgeline 86 Monte Carlo

10-06-2011, 11:17 PM	#16
WTFWSAT Senior Member Join Date: Nov 2007 Location: Summerville Posts: 861	Thanks Rob, Anything special about pulling the valve body off? Am i looking for worn o-rings/pluggage? Im sure he doesnt want to rebuild it just yet so ill try this first. __________________ Fastest stock computer 5.0 on the planet! Looking for cheeep msd 6al! PM me! 88 Coupe (turtle) 03 Cobra (tortoise)

10-07-2011, 07:36 AM	#17
MonteC Senior Member Join Date: Oct 2009 Location: Summerville Posts: 4,431	vb is pretty simple, the check balls will fall out but I have plenty of diagrams for the locations and a little petroleum jelly will stick them back into place. The vb will come down complete, no spring flying around. Ill try and send you a couple diagrams with the problem areas today. __________________ Griffin Transmission -Home of the most badassest Monte Carlo- Cell: 843-276-0554 Shop: 843-793-4607 04 RSX 06 Ridgeline 86 Monte Carlo