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4T80E..Doesn't look good


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Well, First I want to start thanking each of you who'll take the time to read and try and answer this. It is my first post here so please be gentile :D

I started having an issue with my tranny. When cold it would shift through all four gears just fine, but then when heating up, it would kick me out of OD, I would have to manually use third... then after some more driving, even third became unusable having to use only second (If you leave it in third or OD, it would rev up then the gear would kick in for a second, then back to reving up as if it was in neutral).

So, I read over and over on each tread I could find, and I thought the same thing you are possibly thinking... darn filter and them valves (solenoids).... While it could still be the issue (did not wanted to change them just yet) I did find something... not good on the tranny pan.

I found this round? shaped pieces of plastic which seems to be the kind you use on high temp gaskets. Nothing on the magnet tho'.

Question here is, do any of you know where does that gasket plastic thing goes? or where did that got broke from?

Here's a picture

http://www.flickr.com/photos/freako12/3429228038/

I'm trying to get a closer shot, but I've been unable to upload it to the page... sorry

OOh, I almost forgot. this is not for a caddy (Yess I know I'm on a caddy forum), I'm driving a 1996 Olds Aurora 4.0.. but should be the same thing.. right?

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:welcomesmiley:

photo is marked private, and can't be viewed.

Yes, the aurora V8 used the 4L variant of the Northstar with a 4T80E transmission.

Bruce

2023 Cadillac CT4-V Blackwing

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:welcomesmiley:

photo is marked private, and can't be viewed.

Yes, the aurora V8 used the 4L variant of the Northstar with a 4T80E transmission.

Thanks Bruce. I apologize. I thought I had made 100% sure they were open to everyone. Do you mind trying the following link?

http://www.flickr.com/photos/freako12/sets...57616585098108/

Thanks for your fast response

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That looks like clutch material and not a good sign, I dont see any plastic thing only clutch material, does that arched material look like plastic or clutch material?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Well, it looks only like plastic. You know how on very hot environments you cannot use rubber based gaskets so they use these plastic (polymer) gaskets? This is what it looks to me. The magnet on the pan was quite clean with very few debris as well.

I must say that this tranny seem to have had the solenoids replaced as it already has the filter retainer with the longer bolt.

Do you believe if it was clutch material, it would work fine when cold, then start acting up when the tranny starts to warm up?

Thanks!!

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It would help if you ran the diagnostic codes to see if you have a bad sensor, solenoid, etc...

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Did so. I work for AutoZone so I ran the OBD2 scanner on it... only found an intermitent reading on the knocking sensor, and an O2 sensor (which I knew of and I was attempting to change it along the tranny issue).

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I have taken a close up look at that photo and I do not believe that it follows the shape of the pan gasket at all. It certainly looks like clutch material to me...

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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OKKKK.... SOME MORE BAD NEWS.

I went under the car and checked to see if everything "looked" ok. I've dealt with engines before, but never on trannys so please excuse my knowledge-less post.

When you take the the valve body assembly out, you have these two... cavities or so to say. In these cavities, you have some rings. Well, the middle ring (which has some tab/leveler/something sticking out), is broken. You can move it with your hand. I added a couple more pics on the link above showing this. They are taken below the car with my cell phone so they wont be perfect, but they show what I'm talking about.

What is this holding and what could've caused it to 'pop'? Is it repairable?

Thanks everyone!!!

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Are you speaking of that black thing?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I would say you need a total rebuild at this point, that is much too much debris in your pan

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Are you speaking of that black thing?

Mhh.. on the image where you see the "close-up", you'll see that this 'ring' has this tab sticking up towards the middle of the opening. Right where it ends, there is a gap of about 1/4 of an inch. As you can see on the back, where most the light gets reflected, you'll see that from the back, you have a rectangular uneven piece sticking out a bit. You may have to download the image to see it this big.

Anyway, I do agree that a rebuild would be necessary at this point. Any particular tranny rebuild guide you'll recommend for a hard-headed DIY'er like myself?

Thanks for your time by the way! it is truly appreciated!

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First, get the Helm's shop manual. Not any other one. helminc.com or check ebay for GM shop manual CD/DVDs.

Here is the transmission rebuild list from the shop manual:

Transmission Overhaul Procedure

In order to overhaul, follow the sequence below.

1. Torque Converter and Oil Pump Drive Shaft Removal

2. Holding Fixture Installation

3. OSS Sensor and Cooler Fitting Removal

4. Fourth Servo Removal

5. Final Drive End Play Measurement

6. Case Extension and Scavenge Pipe Removal

7. Differential Carrier and Housing Removal

8. Output Shaft Removal

9. Final Drive Carrier, Sun and Internal Gear Removal

10. Bottom Pan, Gasket, and Scavenge Screens Removal

11. Lower Control Valve Body Assembly Removal

12. Input Shaft End Play Measurement

13. Side Cover, Gasket, and Filter Removal

14. Oil Pump, Upper Control Valve Assembly Removal

15. Case Cover Removal

16. Drive/Driven Sprocket and Chain Removal

17. Input Speed Sensor and Wiring Harness Removal

18. Second Clutch Plates and Reverse Clutch Removal

19. Fourth Band and Third Clutch/Reaction Shell Removal

20. Parking Pawl Removal

21. Forward Clutch Asm and Low Reverse Band Removal

22. Manual Shaft Assembly Removal

23. Case Inspection

24. Drive Sprocket Support and Seal Replacement

25. Forward and Coast Clutch Assembly Overhaul

26. Low/Reverse Band and Fretting Ring Installation

27. Forward and Coast Clutch Installation

28. Final Drive Internal Gear and Snap Ring Installation

29. Forward Clutch Support Stud Installation

30. Parking Pawl and Pivot Pin Install

31. Third Clutch and Reaction Carrier Disassemble

32. Third Clutch and Reaction Carrier Assemble

33. Reaction Carrier/Shell and Third Clutch Installation

34. Fourth Band Installation

35. Reverse Clutch Housing and Second Sprag Disassemble

36. Reverse Clutch Housing and Second Sprag Assemble

37. Reverse Clutch Housing Installation

38. Second Clutch Plates Installation

39. Driven Sprocket Support Disassemble

40. Driven Sprocket Support Assemble

41. Drive Link and Sprockets Assemble

42. Thrust Bearings Installation

43. Case Cover/Turbine Shaft Seal Replacement

44. Case Cover Assembly Installation

45. Input Shaft End Play Measurement

46. Upper Control Valve Body Disassemble

47. Upper Control Valve Body Assemble

48. Upper Control Valve Assembly Installation

49. Pump Disassemble

50. Secondary Pump Disassemble

51. Secondary Pump Assemble

52. Pump Assemble

53. Pump Installation

54. Temperature Sensor, Torque Converter Clutch (TCC) Solenoid, and Pressure Control Solenoid (PCS) Valve Assemble

55. Oil Filter and Side Cover Install

56. Lower Control Valve Body Assembly Disassemble

57. Channel Plate Assemble

58. Lower Control Valve Body Disassemble

59. Lower Control Valve Body Assemble

60. Lower Control Valve Body and Transmission Fluid Pressure (TFP) Switch Install

61. Accumulator Housing Disassemble

62. Accumulator Housing Assemble

63. Lower Controls Assembly Installation

64. Manual Link and Wire Harness Connection

65. Scavenge Screens/Seals, Bottom Pan Installation

66. Final Drive Carrier Inspect

67. Differential Carrier Overhaul

68. Final Drive Carrier/Differential Carrier Install

69. Output Shaft Installation

70. Scavenge Pipe Installation

71. Case Extension Install/Final Drive End Play Check

72. Fourth Servo Overhaul

73. OSS Sensor and Cooler Fitting Installation

74. Axle Seals Replacement

75. Torque Converter and Oil Pump Drive Shaft Install

Bruce

2023 Cadillac CT4-V Blackwing

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