detjoe Posted May 11, 2006 Report Share Posted May 11, 2006 Now back to the 4L80E conversion... <{POST_SNAPBACK}> thank you. Link to comment Share on other sites More sharing options...
FuelSlut Posted May 11, 2006 Report Share Posted May 11, 2006 Link to comment Share on other sites More sharing options...
adams2003 Posted May 11, 2006 Report Share Posted May 11, 2006 Thank god. Link to comment Share on other sites More sharing options...
FuelSlut Posted May 11, 2006 Report Share Posted May 11, 2006 yeeeeah ANYWHO... approx. how much "more" drivetrain loss are we looking at here with a 4L80 as opposed to a 4L65 eh? Link to comment Share on other sites More sharing options...
zippy Posted May 11, 2006 Report Share Posted May 11, 2006 yeeeeah ANYWHO... approx. how much "more" drivetrain loss are we looking at here with a 4L80 as opposed to a 4L65 eh? about 4-7%. Link to comment Share on other sites More sharing options...
04CHASE Posted May 11, 2006 Report Share Posted May 11, 2006 yeeeeah ANYWHO... approx. how much "more" drivetrain loss are we looking at here with a 4L80 as opposed to a 4L65 eh? <{POST_SNAPBACK}> the 4-7% higher parasitic drag is compared to the 65E. As an example if you had a 600RWHP truck with a 65E, you'd lose an estimated 24-42RWHP Link to comment Share on other sites More sharing options...
misterp Posted May 11, 2006 Report Share Posted May 11, 2006 about 4-7%. Can that be helped with the installation of the aftermarket planetary sets with lower gear ratios? Link to comment Share on other sites More sharing options...
BenKey Posted May 11, 2006 Report Share Posted May 11, 2006 about 4-7%. Can that be helped with the installation of the aftermarket planetary sets with lower gear ratios? <{POST_SNAPBACK}> From what I've read, the aftermarket planets are weaker than the stock ones. You'll still have bigger/heavier pieces taking more power to turn them. Link to comment Share on other sites More sharing options...
06VHO Posted May 16, 2006 Report Share Posted May 16, 2006 about 4-7%. Can that be helped with the installation of the aftermarket planetary sets with lower gear ratios? <{POST_SNAPBACK}> Stock gear ratios: 4L80E= 1st-2.48, 2nd 1.48, 3rd-1.00, 4th 0.75 4L65E= 1st-3.06, 2nd 1.63, 3rd-1.00, 4th 0.70 If you have enough power to need a 4L80E you will get better traction with the 4L80E's 2.48 1st gear ratio. Typically aftermarket planetary gear sets only change the ratios in 1st and 2nd gears. In 3rd gear you are still 1:1. That being said, aftermarket planetary gears will not help. The (4L80E) 0.75 4th gear will not drop rpm as much as the (4L65E) 0.70 4th gear which has pros and cons. Also, if you have 4.10:1 axle ratio and a (4L65E) 0.70 4th gear your final drive ratio= 2.87:1 or a (4L80E) 0.75 4th gear your final drive ratio= 3.08:1 . Link to comment Share on other sites More sharing options...
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