# Just inherited stock 66 Mustang - does not start well after $$$ **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [June 3, 2023, 12:54pm UTC](https://community.cartalk.com/t/just-inherited-stock-66-mustang-does-not-start-well-after/190962 "2023-06-03T12:54:15Z")\ **Posts on this page:** 1\ **Showing post:** 162
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [June 9, 2023, 10:10pm UTC](https://community.cartalk.com/t/just-inherited-stock-66-mustang-does-not-start-well-after/190962/162 "2023-06-09T22:10:06Z")
My truck has a Ford C4 trans & offers up D, 2, or 1 forward selections. Selecting “2” doesn’t mean “2” only though. It still starts in “1”, then shifts to “2”. But never goes to 3. I guess “2” for a low traction selection wasn’t a concern for a 4WD truck, just put it in 4WD mode for low traction. “2” comes in handy on long down-hills, provides some engine braking. I always wondered why they call it C4? Since it only has three forward gears. Or are they also counting R? Ford has a C6 transmission too. Does it have 5 forward gears and R? OP, you might want to keep the link below, has some pertinent info for your Mustang probably. Especially if you find your C4 automatic transmission won’t shift out of first, look at the posts about the transmission vacuum modulator. > [@Early 70's Ford 302 Engine-performance Problem](https://community.cartalk.com/t/early-70s-ford-302-engine-performance-problem/157876): > > Engine idles & runs perfectly when cold, responsive to the gas pedal, plenty of power, but as it warms up after 15 minutes of driving it starts to sputter and misfire. First symptom, pressing on the gas pedal to accelerate from 25 mph, very noticeable hesitation. A few minutes after that, balks when attempting to go over 40 mph. 10-15 minutes after that the performance gets much worse, hard to keep running, and stalls at idle, even in neutral. Engine was due for new points anyway, … --- _[View the full topic](https://community.cartalk.com/t/just-inherited-stock-66-mustang-does-not-start-well-after/190962)._