The 4L85E, a variation with a slightly higher input torque capacity, was used behind the Duramax diesel in GMC/Chevrolet vans until the 2005 model year, when the 6 speed 6L90 replaced it. Half ton 6.2L/6.5L diesels of the same period received the lighter duty 4L60 instead of the 4L80. The transmission is electronically controlled, and was used in GM gasoline applications until 2009. The transmission was trumped by the Allison 1000 when the Duramax diesel was introduced for the 2001 model year and would have never held up to the engine's rated torque.
4L80E & 4L85E Ratios
1st |
2nd |
3rd |
4th |
R |
2.482 : 1 |
1.482 : 1 |
1.00 : 1 |
0.750 : 1 |
2.077 : 1 |
4L80E & 4L85E Transmission Specs
Transmission: |
General Motors 4L80E & 4L85E |
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Type: |
4 speed automatic overdrive transmission |
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Predecessor: |
TH400 |
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Model Years/Applications: |
1991-1999 GMC Sierra/Chevrolet Silverado 1500/2500/3500 & Suburban(C1500, C2500, C3500, K1500, K2500, K3500) |
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Case Material: |
Die cast aluminum |
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Max Input Torque: |
4L80E |
440 lb-ft (597 N-m) engine torque |
4L85E |
460 lb-ft (624 N-m) engine torque |
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Max GVWR: |
18,000 lbs |
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Max GCWR: |
22,000 lbs |
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Weight: |
236 lbs dry, 260 lbs w/ fluid |
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ATF Type/Spec: |
DEXRON VI automatic transmission fluid, ~ 13.5 qts total capacity (may vary by application) |
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ATF Filter Part Numbers: |
1991 - 1996 pickup, Suburban, & Van |
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1997 - 1999 pickup/Suburban |
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Additional Info: |
RPO code "MT1" |
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4 |
Four speed transmission |
|
L |
Longitudinally mounted |
|
80 |
High torque capacity, 885 lb-ft maximum gearbox torque |
|
E |
Electronically controlled |
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