th200-4r reverse on position 1 and no foward speed

[flat31]

Hi guys,
I'm French and I'm having a problem with my TH200-4R for my rod.(i doing 16000 miles before)
Two years ago, when I was returning from a concentrate at 106° Fahrenheit on the highway, I got a cloud of smoke while riding, and I stopped immediately.
I lost a little oil, but I was almost at the maximum, but I had no gears, either forward or reverse. I rebuilt the gearbox with parts from Art Car Transmission.
A rebuild kit (red disc, rings, all seals).
The oil pump is checked on a plate and is good (10-blade pump).
The forward drum is new.
The stator is new.
The converter is new. TCI242500.
There's a Transgo HD-2 .
Today, after 6 reassemblies, I still have the same problem: I have no forward gears, and in position 1 I have the reverse. (The rear wheels are raised.)
I don't know what to do except buy a rebuilt and tested gearbox, but the gearbox will cost me 5,000 euros including taxes, delivered to my home in 4 months.
I've been visiting this forum for months, and I've seen that you've managed to solve certain problems, so I'm giving it a try too.
In the reverse position, the wheels are locked as if I were in park. Idle pressures
P 63
R 100
N 65
D 64
D 64
2 62
1 60
At 1600 rpm
P 80
R 120
N 90
D 80
D 80
2 100
1 109
TV cable fully taut
P 110
N 110
D 110
D 90
2 90
1 90

 

[THensley]

this might help

 

[flat31]

thank's
i will look

 

[flat31]

The information in the manual is interesting, but I don't think it's the cable adjustment or the oil quality. I used high-quality oil.
I checked the air discs and pistons for proper operation. All the seals were changed second time, and all clearances are within the low tolerances specified in the ATSG review.
The valve body pistons were removed and are not locked.
In position R, the wheels are locked, and in position 1, I have reverse and nothing else.
Both parts of the oil pump were tested on a brand.
I think I overheated and that damaged something I can't see.

 

[THensley]

all your pressures are low.I will say Im no transmission builder and have no advice where to look I keep hopping TexesT would jump in.
I use that reference material from Extreme Automatic because I run his transmission.

 

[Rick the pool guy]

Did you check your transmission pressure after rebuild...if not most likely it failed due to inadequate pressure

 

[Anthony P]

I read you've rechecked things several times. So, I'm thinking simple issues like the o-ring on the filter neck or linkage mis-adjustment would have been discovered and explain why line pressures are low. And you did your air checks.

the line pressure preliminary check attachment below is from the GM service manual and is probably duplicative to what you already have. For reference, I attached the complete section 7 from the GM manual. Perhaps the charts can point you to additional areas to inspect.

there is also a dedicated facebook group dedicated to tech only. It's a private group run by a couple of turbo buick experts who work on these cars for a living. I'd suggest to join that group as well and ask for input before deciding to invest in shipping the trans to the USA for service. Link to the tech group below.

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[flat31]

Did you check your transmission pressure after rebuild...if not most likely it failed due to inadequate pressure

 

[flat31]

Oui, j'ai vérifié dans mon premier message. J'ai mis les pressions que j'ai après le remontage.

 

[flat31]

Yes, I checked it in my first message. I put the pressures I have after reassembly.

 

[flat31]

I read you've rechecked things several times. So, I'm thinking simple issues like the o-ring on the filter neck or linkage mis-adjustment would have been discovered and explain why line pressures are low. And you did your air checks.

the line pressure preliminary check attachment below is from the GM service manual and is probably duplicative to what you already have. For reference, I attached the complete section 7 from the GM manual. Perhaps the charts can point you to additional areas to inspect.

there is also a dedicated facebook group dedicated to tech only. It's a private group run by a couple of turbo buick experts who work on these cars for a living. I'd suggest to join that group as well and ask for input before deciding to invest in shipping the trans to the USA for service. Link to the tech group below.

The hydraulic diagnostics are the same as my ATSG, but yours includes hydraulic diagrams that will help me.
When I look at your line pressure chart, I see that my pressures are a little low, but in my ATSG, the pressures are for a 1990 200-4r gearbox, and yours are for a 1987 gearbox. Since my gearbox is from 1986, I'll use your chart as a guide.
Thanks for this information.

 

[Rick the pool guy]

Yes, I checked it in my first message. I put the pressures I have after reassembly.

Just saw pressure that you posted and that's way off...needless to say your transmission could be toast