4-L65-E is in the H2 what is it.
09-13-2002, 12:43 AM
#6
TECH Fanatic
Re: 4-L65-E is in the H2 what is it. </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Ryan Karasek:
<strong>It is just a beefier 4L60E. The gear ratios are the same. The front and rear planetary gears are upgraded to 5 gear sprags.
Ryan K.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Typically GM upgrades a trans for more torque capacity with multiple small changes. These could be extra planets, maybe extra clutch plates but often material and heat treatment changes. Like any mechanism, there are weak points, and when you strengthen the weakest, the next weaker fails.
Yes, the gear ratios for the 4L65-E are the same as 4L60-E. A gear ratio change whould probably get a new number. There is/was a 4L60-E HD (M32) with about 6% more capacity. I expect the 4L65-E may be optimized for more durability in the lower gears, as it's used in the H2 Hummer and 6.0L heavy-trailer capacity trucks.
My guess would be that we won't see much more upgrading of the 4L60/65 auto. It's time for more gears, as GM heads toward more RWD vehicles. There has been a GM 5 speed (5L40-E) for a few years originally used in BMW 3 series and X5, as well as Catera, I believe. It's a 40 series trans good only up to about 3L.
I wouldn't be surprised to see a family of 5 or maybe even 6-speed autos from GM soon. 6 usable speeds are about as available as 5 speeds using only two compound (Simpson or Ravigneaux) planetary gearsets, I believe. I sure would like one in my A4 Vette, especially with the performance modes available now. My gut feeling is a state-of-the-art 6 sp auto would be difficult to beat with our M6. Can you see paddle shifters and a couple of programmed performance modes? If it were my call, I'd first put one in the (Vette based) Cadillac XLR and the C6(?).
Unfortunately it isn't my call.
<strong>It is just a beefier 4L60E. The gear ratios are the same. The front and rear planetary gears are upgraded to 5 gear sprags.
Ryan K.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Typically GM upgrades a trans for more torque capacity with multiple small changes. These could be extra planets, maybe extra clutch plates but often material and heat treatment changes. Like any mechanism, there are weak points, and when you strengthen the weakest, the next weaker fails.
Yes, the gear ratios for the 4L65-E are the same as 4L60-E. A gear ratio change whould probably get a new number. There is/was a 4L60-E HD (M32) with about 6% more capacity. I expect the 4L65-E may be optimized for more durability in the lower gears, as it's used in the H2 Hummer and 6.0L heavy-trailer capacity trucks.
My guess would be that we won't see much more upgrading of the 4L60/65 auto. It's time for more gears, as GM heads toward more RWD vehicles. There has been a GM 5 speed (5L40-E) for a few years originally used in BMW 3 series and X5, as well as Catera, I believe. It's a 40 series trans good only up to about 3L.
I wouldn't be surprised to see a family of 5 or maybe even 6-speed autos from GM soon. 6 usable speeds are about as available as 5 speeds using only two compound (Simpson or Ravigneaux) planetary gearsets, I believe. I sure would like one in my A4 Vette, especially with the performance modes available now. My gut feeling is a state-of-the-art 6 sp auto would be difficult to beat with our M6. Can you see paddle shifters and a couple of programmed performance modes? If it were my call, I'd first put one in the (Vette based) Cadillac XLR and the C6(?).
Unfortunately it isn't my call.
