98 Elantra wiith NO REVERSE and SHIFTING HARD

I have a 98 Elantra with the 1.8 engine. The automatic transmission is giving me some problems. The orginal Transmission had no reverse and shifted hard between 1st and 2nd then it would loose connection when it
it 25 MPH. I pulled a transmission from a 97 Elantra and it does the exact same thing. No reverse and shifting hard between 1st and 2nd and looses connection at 25 MPH. I even changed the Trans. Computer and it did not help. If I take the O/D off it will shift hard in 1st to second and then I got it up to 45 MPH in my back road but it does not shift again. Then I started from a start and hit the gass hard and when it was in 1st gear it seemed to drop down a gear like it does when you floor it. CAN IT BE STARTING IN 2ND GEAR? if so what would cause this or is the trans mission I got bad as well. ANY HELP GREATLY APPRECIATED!
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According to my electrical schematic, the tranmission in the 1997 has two shift solenoids, one torque converter clutch solenoid, and one pressure control solenoid, but the 1998 has three shift solenoids, one torque converter clutch solenoid, and two pressure control solenoids.
It's been awhile since I've looked at one of these electrically, but I'm curious how you even got the electrical connectors to plug in.
How many terminal holes do you have in the shift solenoid connector on the harness and how many on the trans connector?
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hyundaitech wrote:

I will count it tomorrow.The transmission is supost to be the same for the 1.8 on 96 - 98 models. Everything was same. From memory it has one main wire harness and one sensor on the driver side of the transmission on the top of the transmission right beside the motor mot and it runs to a sensor on the driver side facing the front bumber. Right to the left of it is another sensor. Does this help. in 98 they have a 1.8 and a 2.0 engine option. Mine is the 1.8 and the 97 was a 1.8. When I looked at the transmission from a accent (96)or 95 it looks to bolt the same other than the rear motor mount is in a different position but could be moved to the same location. And the plate that protects the oil pan that bolts to the botton of the transmission is not there on the accent. But looks like it would work as it has the same wire harness and sensor locations. it is on a 1.5 engion. You r thoughts?
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In my experience, the differential on the Accent has a different offset from the bellhousing and different cv joint shaft diameters. I wouldn't try it.
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