47re trans questions. i need answers.

[SixOhh]

for you tranny builders out there,

Just picked up a 2wd VP truck for the ol' lady ON THE CHEAP.
The truck is bone stock with 200k on it and has never been used for heavy towing. it has been used to drive back and fourth from a drilling rig and the owner has owned it since it was brand new in 00' and he has a meticulous record of maint.

it looks as if the 47re has either a stuck OD solenoid or the clutch packs on the overdrive section are gone.... the trucks runs and drives perfect until you get up past 40-50 mph and it acts like it was thrown in neutral. it will not propel itself again until you drop your speed back down.

i am in no way a trans expert but i wish to learn more. once mitchell on demand comes back online i will have access to some schematics but i have some questions....

i want to do all the work myself and im wondering what my options are and what to look for. i plan to first drop the pan, and check the fluid, magnet and filter for contaminants. from there i was suggested to check the OD solenoid because sometimes they can hang.Where is this going to be located on the valve body and how can i tell if its in good operating condition or not?
i have no problem dropping the OD section and tearing it down but if the clutch packs are toast how hard are they to line up and replace? are red eagle clutch packs still some of the best or will it really matter for a stock vp truck?
is there anything else to look for or anything else that can cause the tranny to have these symptoms?


the truck will get an airdog and an AFE and it will not be built for speed or towing... my goal is a 20-22mpg fuel saver truck for the woman and reliability is all she needs...

thanks for the input fellerz!

 

[joefarmer]

for you tranny builders out there,

Just picked up a 2wd VP truck for the ol' lady ON THE CHEAP.
The truck is bone stock with 200k on it and has never been used for heavy towing. it has been used to drive back and fourth from a drilling rig and the owner has owned it since it was brand new in 00' and he has a meticulous record of maint.

it looks as if the 47re has either a stuck OD solenoid or the clutch packs on the overdrive section are gone.... the trucks runs and drives perfect until you get up past 40-50 mph and it acts like it was thrown in neutral. it will not propel itself again until you drop your speed back down.

i am in no way a trans expert but i wish to learn more. once mitchell on demand comes back online i will have access to some schematics but i have some questions....

i want to do all the work myself and im wondering what my options are and what to look for. i plan to first drop the pan, and check the fluid, magnet and filter for contaminants. from there i was suggested to check the OD solenoid because sometimes they can hang.Where is this going to be located on the valve body and how can i tell if its in good operating condition or not?

It's the thing that looks like this:

You hsould be able to put a multimeter on it and if it's < 10 ohms across the terminals, then it's ok.

i have no problem dropping the OD section and tearing it down but if the clutch packs are toast how hard are they to line up and replace?

You'll need a press and an old intermediate shaft to line up the splines.

are red eagle clutch packs still some of the best or will it really matter for a stock vp truck?

I wouldn't use red altos on a daily driver. they'll glaze and then need replaced.

is there anything else to look for or anything else that can cause the tranny to have these symptoms?

Drop the pan. You might find the O/D snap ring?

 

[SixOhh]

thx for the pointers and info sir.

yeah, snap ring.. i hope its that easy


ill let ya know what i find out when i get it dropped!

 

[SixOhh]

stick with OEM clutches if it needs them?


another question. when adjusting the bands, what are they adjusting for? certain gears or shift points or what?

 

[mathews8pt]

Front band is 2nd gear, rear band is reverse and 1st manual low.

My guess would be burnt OD clutches and/or blown OD piston seal. OD brake pack(the one that applies for OD) is easy to change and nothing will need pressed. I would stick with Borg clutches

 

[zstroken]

You hsould be able to put a multimeter on it and if it's < 10 ohms across the terminals, then it's ok.

I am reading that as less than 10 ohms, actually it should be 33 ohms, unless I am missing something.

 

[SixOhh]

well, i just went for a little drive for the first time and i dont think the problem is the same as what the seller described....

its not falling out of gear so to speak, its stuck in second gear. it is very sluggish to take off and the rpm's hold steady with no shifting. i can get it up to 50 or even 60 just fine but the Rpm's stay around 2500 to 3000 depending on speed.

its not that the OD is gone, its just not shifting in...

so where to go from here? valve body issue?


it also seems the fan clutch is stuck wide open. sounds like a school bus.

thx for some insight fellas, i think ill drop the pan tonight if i know what to check for.

is there a separate solenoid that might keep it from shifting out of second????

 

[mathews8pt]

Did you check for codes? If the gov pressure solenoid fails it will start in 3rd and could cause the symptoms you described. I would check codes and do some more diagnosis before pulling the pan.

 

[SixOhh]

Did you check for codes? If the gov pressure solenoid fails it will start in 3rd and could cause the symptoms you described. I would check codes and do some more diagnosis before pulling the pan.

Ok so it acts like its stuck in 3rd then. I have replaced the gps in my DD (48re) so I know how to do that... I had to change it out because I had the surge at light throttle during the 1-2 shift.

Ill pull the codes and see what I find

 

[SixOhh]

Just got a stored code from the TCM ...

P0753 shift solenoid A

What all does this solenoid control?

 

[zstroken]

a and b referrs to lock up and OD solenoids if I remember correctly.

 

[joefarmer]

I am reading that as less than 10 ohms, actually it should be 33 ohms, unless I am missing something.

Do I have the governor pressure solenoid and teh LU/OD solenoids confused? I may have remembered them backwards.

 

[SixOhh]

anyone have a suggestion on a refutable online OEM parts house?

im going to order the G.P.S. and the shift solenoid and go from there...

 

[SixOhh]

well, spent 180 bucks yesterday and replaced the GPS, the O/D solenoid pack and the governor pressure sensor along with a fresh filter and some amsoil.. im happy to report the truck is shifting like it should be again(under normal driving conditions).

the only thing i noticed is from a dig @ WOT the trans will wrap out in first and stay there till you let off then it will make the 2nd gear shift.

so i adjusted the front band today to specs and it was definitely loose. i was wondering if anyone can tell me what adjusting the front band really does?

does it control the engagement of the 1-2 shift i.e. the firmness or what?
i set it 2 turns from bottom but i am curious if further tweaking in or out can help or hurt city driving.


thx to joefarmer for pointing me off in the right direction