1990 Chevy C1500 will not go into forward drive gears.
We've changed the trans 5 having it come out of working vehicles but always the same result. Its a 700R4 trannie, are there any sensors or relays that can cause this it will shift into P R N but not into OD D 2 1
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The question is a little vague but I think I know what your referring to. All modern automatic transmissions have torque converters. This is the device that connects the engine to the transmission. All vehicle manufacturers like the trans to be nice and smooth shifting. That's great but it does come with some minor drawbacks. If you are facing slightly down hill and you put your car in reverse but do not step on the gas slightly I can guarantee that you will indeed roll forward. You can eliminate that issue by holding your left foot on the brake while you shift into reverse. Then, as soon as you feel the trans engage, gently depress the gas pedal with your right foot and it will eliminate that forward roll problem.
You may have a broken direct drive drum or another internal problem that is preventing the forward clutch packs from being engaged. There might be a service code stored in the computer relating to the problem but if the problem is mechanical in nature it often won't set a code of any kind. I believe you have a 4L60E transmission in this vehicle and usually when I see this type of problem the transmission needs to come out and be repaired. Hope this helps a bit!