95Noobie
OBS Enthusiast
I'm trying to get used to my shift points and understand how to deal with the odd situation where after 3rd gear there is what seems to be a two gear in one option called drive/overdrive? There is a D with a block O for overdrive around it on the shifter dial. When pulling a light trailer on flat ground 3rd gear puts the rpms too high. If it put it in Drive/Overdrive which is my only other option then the 'drive' portion seems to be the sweet spot but then once I get around 50mph it tries to drop rpms again (is this the electronic overdrive?) but puts some bad lug on the engine.
Without the trailer, if I'm hovering right around 50 and let off gas just slightly it will drop the rpms into 'overdrive' and then between 45-50 it will lug the engine badly.
The rpm range for this overdrive situation is very narrow, almost any grade in the road or even trying to accelerate 1mph will kick it back to 'D' Obviously if I need to get power or speed more aggressively I can push the pedal half way and get it to go back to 3rd gear where I can get some added power.
So it is only a 4 speed transmission right? So how does the transmission drop rpms and get both drive and overdrive out of one gear?
It would be so helpful if I could use the drive gear but not have it ever drop into the overdrive. That would be kind of like having a tow/haul button or being able to lock it in a gear using a manual shift like the newer chevy trucks have.
Has anyone else struggled to find a better way to use drive without overdrive taking over? Is there a programming change possible in the 4L60E from 1995 to disable the overdrive or change shift points so it won't come lug the engine by dropping into overdrive too early? Or is there a way to disable it via a switch on a wire?
With the 305 being underpowered for the truck/tires I can't imagine ever being able to stay in overdrive unless perfectly locked at 55 or 60 degrees on a very smooth and very flat highway.
thanks!
Without the trailer, if I'm hovering right around 50 and let off gas just slightly it will drop the rpms into 'overdrive' and then between 45-50 it will lug the engine badly.
The rpm range for this overdrive situation is very narrow, almost any grade in the road or even trying to accelerate 1mph will kick it back to 'D' Obviously if I need to get power or speed more aggressively I can push the pedal half way and get it to go back to 3rd gear where I can get some added power.
So it is only a 4 speed transmission right? So how does the transmission drop rpms and get both drive and overdrive out of one gear?
It would be so helpful if I could use the drive gear but not have it ever drop into the overdrive. That would be kind of like having a tow/haul button or being able to lock it in a gear using a manual shift like the newer chevy trucks have.
Has anyone else struggled to find a better way to use drive without overdrive taking over? Is there a programming change possible in the 4L60E from 1995 to disable the overdrive or change shift points so it won't come lug the engine by dropping into overdrive too early? Or is there a way to disable it via a switch on a wire?
With the 305 being underpowered for the truck/tires I can't imagine ever being able to stay in overdrive unless perfectly locked at 55 or 60 degrees on a very smooth and very flat highway.
thanks!