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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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

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

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391

Losing TCC Lockup

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144

4L80E limp mode

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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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586

Question: 6L90e upgrade in a '96 K2500?

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539

Question: Going on and out of limp mode

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701

Question: 4L80e transmission from Humvee?

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548

by kingofthirdrock

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

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263

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

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3K

Question: TransGo HD2 Install

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527

by mbost

Question: 4L80e slipping/shifting issues

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553

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

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731

Changing axle ratios & trans shift points.

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787

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

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476

1993 6.5 4L80E DTC 68 Overdrive Ratio Error

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by Carl Brownfield

Transmission tag question

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548

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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518

by asm225

Did the transmission oil/filter change

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515

by ForeverFalcon40

Question: 1997 4L80E in 1992 truck

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510

Question: DTC codes

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422

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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Reverse / Downshifting from OD GRINDING / Also surges in Reverse

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338

by oldmanriverman

Question: difference between 94 and 95 4L80E

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548

Question: How to Adjust Passing Gear Kick-down?

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2K

Question: Speedometer reads too fast

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748

Slips in and out of OD

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575

Question: Upgrades?

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897

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

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10K

1992 k2500, 6.5td, semi upgraded 4l80e

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by Jsamples1981

Question: 1993 6.5 4L80E TCC Unlocking

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444

Question: 4L80 No OD codes 22 85 86

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512

Question: 1995 to 1997 4l80e problems

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by Dabbs_diesel