Why does my truck shift in and out of overdrive?
Why does my truck shift in and out of overdrive? The truck has 115,000 miles. Mostly highway with no towing. Tranny was serviced (flushed) at 30K and at 80K. Fluid level is good and color is normal. The issue is it shifts in and out of overdrive repeatedly if I climb a hill or put load on it. How does overdrive work in a manual car? The overdrive gear performs the same in both manual and automatic cars because, in essence, it is just a gear that has a low ratio. The real difference is exactly what you would expect...