mileage with 4.10 gears
02-06-2005, 10:03 AM
#12
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Originally Posted by hangslo
Damn, I sure wish I could get the type of mileage you guys are getting ... I got 4.10's in my 03' 1500 HD crew cab and average just over 10 mpg around town ...
02-06-2005, 10:15 AM
#13
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Originally Posted by Naked AV
Sounds like you need a tune.
I figure I should pick up some power and mileage just by eliminating torque mgmt ...
02-06-2005, 10:16 AM
#14
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Originally Posted by Naked AV
Please don't apologize for sharing your experience....I really appreciate it.
I had a helluva launch last night with a friend in the truck. Serious acceleration with 100% traction. This seems to always be the case with my truck, so I'm used to it, but it blew his mind completely. He had all kinds of questions - he didn't get why I wasn't spinning like he does in his Thunderbird. I explained to him about tire width (305mm X 2), positraction/limited slip (G80), coils versus leafs, weight transfer (I have pretty soft springs in the back right now), etc.
I don't have a stall and don't plan on getting one. But shortly I will be swapping in a 4L65E, which, with the converter it's equipped with, should stall a couple hundred RPM's higher than the 1600 I'm getting out of the stock 4L60E. So I'll likely be flash/brake stalling to 1800-1900 RPM's. My tires are 305/50-20's, which are 31.6" in diameter. Right now, at 70 MPH, I am running about 1900 RPM's.
I don't have a problem with low-end grunt. I had my cam made for my application, which at the time took the stock stall into consideration. I have an extremely even powerband starting right at the 700 RPM idle, running all the way through redline. That's what happened last night - facing a busy intersection, I just let off the brake and nailed the gas....instant acceleration, shitloads of torque, zero wheelspin. This is why I'm thinking I could do 4.10's and get away with it.
I had a helluva launch last night with a friend in the truck. Serious acceleration with 100% traction. This seems to always be the case with my truck, so I'm used to it, but it blew his mind completely. He had all kinds of questions - he didn't get why I wasn't spinning like he does in his Thunderbird. I explained to him about tire width (305mm X 2), positraction/limited slip (G80), coils versus leafs, weight transfer (I have pretty soft springs in the back right now), etc.
I don't have a stall and don't plan on getting one. But shortly I will be swapping in a 4L65E, which, with the converter it's equipped with, should stall a couple hundred RPM's higher than the 1600 I'm getting out of the stock 4L60E. So I'll likely be flash/brake stalling to 1800-1900 RPM's. My tires are 305/50-20's, which are 31.6" in diameter. Right now, at 70 MPH, I am running about 1900 RPM's.
I don't have a problem with low-end grunt. I had my cam made for my application, which at the time took the stock stall into consideration. I have an extremely even powerband starting right at the 700 RPM idle, running all the way through redline. That's what happened last night - facing a busy intersection, I just let off the brake and nailed the gas....instant acceleration, shitloads of torque, zero wheelspin. This is why I'm thinking I could do 4.10's and get away with it.
Do you know if there's a 4.30 option for our trucks?
02-06-2005, 10:21 AM
#15
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blackbrown, i personally have never heard of a 4.30 gear for our trucks. not saying there isn't one but after 4.10 most people jump to 4.56's.
02-06-2005, 10:27 AM
#16
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Originally Posted by Black Blown 02
Could you elaborate on the different converter you'll be getting with the 65E?
02-06-2005, 10:36 AM
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Originally Posted by Naked AV
I was told the 4L65E from GMPP is built for an LT1 car, so of course it will not stall stock speed behind a 5800 lb Avalanche. Course, we'll have to just wait and see.
02-06-2005, 10:58 AM
#19
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My bad, looks like it's the LS6 it's supposed to work behind...
24221888 4L65-E Automatic Transmission
GM Hydramatic has baked even more technology enhancements into the automatic transmission line up with the new 4L65E. This transmission, the latest creation from GM Hydramatic Motorsports, is a four speed, offering all the latest heavy duty components to stand up to the power of the LS6-405 HP Corvette engines. Upgrades like induction hardened turbine input shafts, larger intermediate servo, an additional three-four clutch plate. All go toward accommodating higher engine power output. The 4L65E offers optimized performance, fuel economy and increase durability. This sate-of-the-art transmission features the latest heavy duty components and high tech-electronic controls. The advanced electronics controlling the LS6 engine also manages the 4L65E shift points, providing unparalleled performance and durability, P/N 24221888 also includes the torque converter. (No core charge required on this transmission)
GM Hydramatic has baked even more technology enhancements into the automatic transmission line up with the new 4L65E. This transmission, the latest creation from GM Hydramatic Motorsports, is a four speed, offering all the latest heavy duty components to stand up to the power of the LS6-405 HP Corvette engines. Upgrades like induction hardened turbine input shafts, larger intermediate servo, an additional three-four clutch plate. All go toward accommodating higher engine power output. The 4L65E offers optimized performance, fuel economy and increase durability. This sate-of-the-art transmission features the latest heavy duty components and high tech-electronic controls. The advanced electronics controlling the LS6 engine also manages the 4L65E shift points, providing unparalleled performance and durability, P/N 24221888 also includes the torque converter. (No core charge required on this transmission)
02-06-2005, 11:35 AM
#20
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Originally Posted by Naked AV
My bad, looks like it's the LS6 it's supposed to work behind...
Back when I had my 97 chevy, you could order the 95 corvette converter and it would stall to about 2500rpm in the truck.