AWD-4L80 swap
09-11-2006, 09:48 PM
#11
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Originally Posted by 2004Denali
6L80 gear ratios: 4.02 2.36 1.53 1.15 0.85 0.67
We are going to have to get one of these smilies that stops half way through the burn out to shift....
I Kind wish the .67 was .60 or so......
I know there has been a few thread on the 6l80e, Ithink I'm going to go do a little searching............
09-11-2006, 09:56 PM
#12
Originally Posted by Wilde Racing
Sweet! So this trans should be as strong as the 4l80-e, right James? 
Bad - Weight, Efficiency, Gear Ratio Range
Good - Strength, Close Ratios, Availability, Adaptability
Compare the 6L80-E:
Weight - still much heavier than a 4L60-E
Efficiency - better than the 4L80-E. This trans was design from the ground up as a passenger vehicle high-performance transmission, not a light and medium-duty truck transmission. Besides less frictional loss, it's got more 2 more gear gatios to help it surpass in the 4L60-E in fuel economy.
Gear Ratio Range - First gear on the 6L80-E is 4.03:1 and sixth is 0.67:1. That is a final drive range of 5.97, that's huge. (A 4L80-E =3.31, 4L60-E = 4.43, 4L80-E+GVOD = 4.20, 4L60-E+GVOD = 5.56, T56(MM6) = 5.32, and the Allison 1000 = 5.08)
Strength - There will be a 6L90-E in the HD 6.0L trucks factory rated at 530lbs torque. Compare that to the factory rating for the 4L80-E at 440 and the 4L85-E at 460. I'd say this unit has a lot of potential because these figures mean that the clutch packs have enough capability to shift that much torque as smoothly as GM would want for a fluffy ride.
Ratios - The spread from first to second is dtill a lot, about half way between the 4L80-E and the 4L60-E, so the 1-2 shift feels better than the 4L60 but not as nice as a 4L80. The rest of the ratio spread is great. I have hot-rodded around in a 6.2L Denali a few times and can say the programming is a little bit busy and slow to upshift when you take your foot out, but the gear ranges provide a nice upshift and keep it in the powerband.
When the 6L80/90-Es become as available and adaptable as the 4L80/85-E already is, I can asure you the 6L80/90-E will obsolete the 80/85 for handling big power in these trucks.
09-11-2006, 10:08 PM
#13
Originally Posted by 2004Denali
...The 90 in 6L90 stands for 900 newtons of torque or about 500ft lbs capacity. (on the 4L85 it means 850 and 650 newtons on 4L65 and the allison 1000 was initially rated at 1000 newton hence the name)
4L60-E is rated at 360ft/lbs (488nm)
4L65-E is rated at 400ft/lbs (542nm)
4L70-E is rated at 400ft/lbs (542nm)
4L80-E is rated at 440ft/lbs (597nm)
4L85-E is rated at 460ft/lbs (624nm)
6L80-E is rated at 439ft/lbs (595nm)
6L90-E is rated at 531ft/lbs (720nm)
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