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

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by Diaric

Info: Sticky 4L80E Conversion - Older Truck

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

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98K

by GenBiltstein

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

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by GenBiltstein

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

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by GenBiltstein

4L80E no codes, no reverse, all forward gears great!

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98K

Intermittent loss of overdrive. NO DTC,S. WTF

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363

Question: Filling Transmission cooler after radiator removal

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333

Question: Shifter/ cable issue

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553

by DieselBurban99

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

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4K

Question: 94y GMC SUBURBAN 4L80E 2nd gear no engine brake

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514

Losing TCC Lockup

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231

4L80E limp mode

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1K

Tranny Code cross reference... someone please answer -I'm going nuts!

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by GHOST

1995 K2500 6.5 4L80E to NV4500 swap in progress questions

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736

Question: 6L90e upgrade in a '96 K2500?

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639

Question: Going on and out of limp mode

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777

Question: 4L80e transmission from Humvee?

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624

by kingofthirdrock

Trying to fix Code 81/82 in my 94 Chevy 3500

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496

Question: TransGo HD2 Install

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588

by mbost

Question: 4L80e slipping/shifting issues

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642

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

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821

Changing axle ratios & trans shift points.

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1K

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

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569

1993 6.5 4L80E DTC 68 Overdrive Ratio Error

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5K

by Carl Brownfield

Transmission tag question

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655

by CB1

1996 4l80e, fresh rebuild, no reverse

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5K

4l80e shudder and surge with engine braking deceleration

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646

by asm225

Did the transmission oil/filter change

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618

by ForeverFalcon40

Question: 1997 4L80E in 1992 truck

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581

Question: DTC codes

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493

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

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by Contract_Pilot

4L80E Rebuild and Improvement

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9K

Reverse / Downshifting from OD GRINDING / Also surges in Reverse

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393

by oldmanriverman

Question: difference between 94 and 95 4L80E

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685

Question: How to Adjust Passing Gear Kick-down?

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2K

Question: Speedometer reads too fast

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933

Slips in and out of OD

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670

Question: Upgrades?

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986

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

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10K