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post #1 of 13 (permalink) Old 06-16-2015, 12:20 PM Thread Starter
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2 gears at the same time?

Hi guys.
Less than in a month there's an annual american vehicles enthusiasts gathering in Baltic countries, but my T-bird doesn't fly, heres why:

Couple of months ago I've been driving in my hometown after a highway and after I stopped on a traffic light I've started to accelerate and it didn't shift from 2nd to 3d, and started breaking with tranny. When we dismantled it it was like obvius what was the reason - broken bearing on reverse drum, so I've ordered a new one (the whole reverse drum kit), waited for a month for it to be delivered ( Yes, it is not very convenient to have and american vehicle in europe) And today we put everything together, with new oil & filter, but it did not help and even became worse in some manner, I have reverse now, but it won't go even from 1-st to second and also first doesn't feel very healthy. THere's a strong feeling that it doesn't switch out from reverse trying to switch to forward gears. I've even tryed to replace the microchip in EEC-V which controls the transmission but it didn't help as well. Do you have any ideas what could cause this trouble, Thanks guys.

Also, forgot to mention, when we just poured ATF, we started testing it with wheels not touching the ground, so I've made 4 slow accelerations 0-60 and all grears worked just fine, after that, I've switched it to reverse, and after than when the reverse piston ( as I suppose ) was filled with oil - I've lost 2nd and furhter gears !

Last edited by Dirthouse; 06-16-2015 at 01:02 PM.
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post #2 of 13 (permalink) Old 06-16-2015, 12:52 PM
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Was this part of a complete rebuild?

1996 Thunderbird LX (4.6), previous daily driver

1995 Mustang GT (5.0), daily driver
1995 GMC C2500 (5.7), alternate daily driver
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post #3 of 13 (permalink) Old 06-16-2015, 12:57 PM Thread Starter
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Originally Posted by Urambo Tauro View Post
Was this part of a complete rebuild?
No, everything stock.
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post #4 of 13 (permalink) Old 06-16-2015, 01:04 PM
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It has never seen a rebuild? How many miles (or kms) are on it? I'm sorry to say it sounds like it's going to have to come apart again...

1996 Thunderbird LX (4.6), previous daily driver

1995 Mustang GT (5.0), daily driver
1995 GMC C2500 (5.7), alternate daily driver
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post #5 of 13 (permalink) Old 06-16-2015, 01:08 PM Thread Starter
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Quote:
Originally Posted by Urambo Tauro View Post
It has never seen a rebuild? How many miles (or kms) are on it? I'm sorry to say it sounds like it's going to have to come apart again...
The torque converter was repaired in 2004 while the car was still in Switzerland, it has 194 000 kms.
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post #6 of 13 (permalink) Old 06-16-2015, 01:15 PM
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I'm thinking piston seals.

1996 Thunderbird LX (4.6), previous daily driver

1995 Mustang GT (5.0), daily driver
1995 GMC C2500 (5.7), alternate daily driver
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post #7 of 13 (permalink) Old 06-16-2015, 02:05 PM Thread Starter
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Quote:
Originally Posted by Urambo Tauro View Post
I'm thinking piston seals.
You mean rubber rings on the reverse piston?
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post #8 of 13 (permalink) Old 06-16-2015, 02:16 PM
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If you haven't already read it, this might be a good read for you which could prove insightful.

http://www.tccoa.com/articles/tranny...on/index.shtml

-Brandon
97 Laser Red Thunderbird LX 162k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
98 Black Mark VIII 160k, stock daily driver
07 Redfire Fusion V6 SEL 178k, for the wife
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post #9 of 13 (permalink) Old 06-16-2015, 02:33 PM
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Quote:
Originally Posted by Dirthouse View Post
You mean rubber rings on the reverse piston?
They're not simple o-rings; they have a square-cut profile. Others are kind of triangular. They tend to harden over time, and small chunks will blow off into the fluid. If you saw any little black chunks inside, it's your seals.

Don't focus solely on the reverse drum, though. You'll want to be real thorough; might as well make it a full rebuild. Seals, frictions, bands, a good cleaning, and maybe a few parts. When mine failed, I lost all forward gears; the forward clutch could barely hold fluid. When I took it apart, the main offender had about 5 or 6 chunks missing.

Here's a link to a website that helped me do mine:
4R70W Transmission Rebuild Diary

1996 Thunderbird LX (4.6), previous daily driver

1995 Mustang GT (5.0), daily driver
1995 GMC C2500 (5.7), alternate daily driver
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post #10 of 13 (permalink) Old 06-16-2015, 02:54 PM Thread Starter
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Quote:
Originally Posted by Urambo Tauro View Post
They're not simple o-rings; they have a square-cut profile. Others are kind of triangular. They tend to harden over time, and small chunks will blow off into the fluid. If you saw any little black chunks inside, it's your seals.

Don't focus solely on the reverse drum, though. You'll want to be real thorough; might as well make it a full rebuild. Seals, frictions, bands, a good cleaning, and maybe a few parts. When mine failed, I lost all forward gears; the forward clutch could barely hold fluid. When I took it apart, the main offender had about 5 or 6 chunks missing.

Here's a link to a website that helped me do mine:
4R70W Transmission Rebuild Diary
I'm not that educated concerning gear boxes, but my mechanic is one hell of a specialist and he did not find any other mechanical faults. It seems like something is wrong with the control, solenoids maybe? The problem is that he doesn't speak english at all.
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post #11 of 13 (permalink) Old 06-17-2015, 11:06 AM Thread Starter
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tranny doesn't shift, wiring map needed

http://forums.tccoa.com/showthread.php?t=162986 Unfortunately thread in 4r70w section did not earn any attention, so we've done a logical brain storm what could cause the tranny fault and got to the idea, that most probably something is wrong with harness that's why I would be very pleased if someone could tell me, where can i get al wiring schemes for 4R70W and hydraulic ones would also be very handy. Thanks.
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post #12 of 13 (permalink) Old 06-17-2015, 11:27 AM
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http://www.tccoa.com/articles/tranny...n/page16.shtml

http://forums.tccoa.com/showpost.php...9&postcount=15

-Brandon
97 Laser Red Thunderbird LX 162k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
98 Black Mark VIII 160k, stock daily driver
07 Redfire Fusion V6 SEL 178k, for the wife
Gone but not forgotten: 96 Mark VIII, 94 Cougar XR7, 93 Mark VIII

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Once you have tasted flight, you will walk the world with your eyes turned skyward, for there you have been and there you long to return. -Leonardo da Vinci
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post #13 of 13 (permalink) Old 06-17-2015, 12:17 PM Thread Starter
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That's just what I needed, thanks !
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