So this is my first diesel. I've had it about a year and am getting to know it pretty good, but one thing I've always wondered about is my second overdrive's effectiveness with my high gearing. I've got a Unitrax/Gear Vendor/Laycox divorced overdrive with an auto and 3.55 rear end gears. It all came with the truck when I bought it. I know that when I'm driving in double overdrive it seems to run fine and smooth, but it also runs at pretty low rpm. I think around 1500 at 70. I'm generally on relatively flat freeways, so it doesn't seem to stress the drive train, but I wanted to get any input you guys have on this. Is it hard on the truck? A good thing? It's really nice to have the flexibility of the GV overdrive when towing with the transmission overdrive off.
So this is my first diesel. I've had it about a year and am getting to know it pretty good, but one thing I've always wondered about is my second overdrive's effectiveness with my high gearing. I've got a Unitrax/Gear Vendor/Laycox divorced overdrive with an auto and 3.55 rear end gears. It all came with the truck when I bought it. I know that when I'm driving in double overdrive it seems to run fine and smooth, but it also runs at pretty low rpm. I think around 1500 at 70. I'm generally on relatively flat freeways, so it doesn't seem to stress the drive train, but I wanted to get any input you guys have on this. Is it hard on the truck? A good thing? It's really nice to have the flexibility of the GV overdrive when towing with the transmission overdrive off.