4L80/85E Transmissions. 6L90 Transmission | Diesel Place

Info: Sticky GM 4L80E/4L60E Reference Material, Manuals, FAQ's/Parts List. (Updated November 2018)

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57K

ATTENTION Sticky Your input needed for building FAQ's for tranny

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39

53K

by Diaric

Info: Sticky 4L80E Conversion - Older Truck

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9K

Info: Sticky The most common problem facing the 4L80-E NO OVERDRIVE and how to deal with it.

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86K

by GenBiltstein

Info: Sticky Leaving electrical and going into Hydraulic. Repeated DTCs?

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8K

by GenBiltstein

ATTENTION Sticky First posters new to 4L80-E/ 4l85-E Transmission forum? Read before posting.

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14K

by GenBiltstein

Question: 4L80e slipping/shifting issues

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70

Is it better to upgrade to full synthetic DEX VI equivalent or stick with older DEX III

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318

Changing axle ratios & trans shift points.

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428

4L80E Cooling Lines Puking, best source for replacements? Also--won't shift down into 1st.

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287

1993 6.5 4L80E DTC 68 Overdrive Ratio Error

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4K

by Carl Brownfield

Transmission tag question

CB1
6 mo ago

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367

by CB1

1996 4l80e, fresh rebuild, no reverse

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3K

4l80e shudder and surge with engine braking deceleration

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305

by asm225

Did the transmission oil/filter change

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335

by ForeverFalcon40

4L80E Limp mode, Trans fuse blowing, unable to clear DTCs 81, 82, 83

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975

Question: 1997 4L80E in 1992 truck

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314

Question: DTC codes

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256

Question: 4l80E 16147609 TCM, ESS, & TPS.. or Manual Valve Body

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623

by Contract_Pilot

4L80E Rebuild and Improvement

2 3 4

70

7K

Reverse / Downshifting from OD GRINDING / Also surges in Reverse

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231

by oldmanriverman

Question: difference between 94 and 95 4L80E

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308

Question: How to Adjust Passing Gear Kick-down?

18

1K

Question: Speedometer reads too fast

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507

Slips in and out of OD

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405

Question: Upgrades?

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731

Transmission connector test point pin locations and what they are for.

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9K

1992 k2500, 6.5td, semi upgraded 4l80e

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238

by Jsamples1981

Question: 1993 6.5 4L80E TCC Unlocking

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289

Question: 4L80 No OD codes 22 85 86

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368

Question: 1995 to 1997 4l80e problems

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288

by Dabbs_diesel

Tranny failing? Torque converter?

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315

by Dabbs_diesel

4l80E No Fourth Gear/Overdrive

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590

Delay going into 1at

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227

by K5_489

Inappropriate UPshifts?

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444

Question: 4l80e towing and speed limiter

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288

by v3gl

6

297

by Mr Mac

4l80e binds in first and kicks out of o.d.

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976

Tranny slams into gears (first time diving into trannies!)

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354

by K2500_Sub496

Temp sensor oddity

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261

Question: 4L80E acting wierd after repair.

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359