th400

  1. K

    TH400 Rebuild or replace?

    I was driving my 86 K30 with a TH400 3 speed auto trans today and it sounded like it slammed down a gear and then the RPMs went flying. I still have reverse and it tries real hard to move forward but makes a lot of grinding sounds. My question is do I rebuild or replace? If I rebuild what kit do...
  2. squaredeal91

    Gave away my LS

    I thought the title might grab attention lol, and this is my first thread. Anyways A couple years ago I parted out a Yukon with a 5.3 and planned to use it in my car. The more I thought about the more I decided I love the small block too much to go that direction. My mom still has the 69 c10...
  3. C

    In need of a th400 to np203 adapter!!!

    I recently broke the rear housing of my th400 along with the adapter to the np203. (I believe is the factory drivetrain. 1976 k20 4x4 big block.) I had a good th400 case laying around Ive swapped everything over to. The issue is trying to find the adapter. The casting number is 376129. I have...
  4. OuchMyToe

    700R4 went out while towing. Culprit?

    I'd like some help identifying three likely culprit (besides myself) to my transmission going out. I need more information before I make decisions about fixing/upgrading it. Here are the circumstances: It's an '85 C10 into which I've put a 400 SBC. I believe it was a stock 700R4. I was towing a...
  5. F

    Th400 shifting.

    I recently bought an 87 chevy c10. Ran and shifted great. Now all the sudden when I'm driving through town at 30-35 cruising speed it kicks down to 1st. Let off the gas and it shifts back up. Start cruising and it drops down again. This doesn't happen all the time. Any thoughts before I start...
  6. 90Saburban

    4L80E or GV Overdrive for my '90 Suburban?

    Hello all - me and my 1990 R2500 Sub are new to the forum. 5.7 liter TBI, 2WD, 4.10 gears, 170,000 miles. I'd like to add overdrive to the Sub at some point in the near future. Maybe this summer if I can source all the right parts. Love the TH400 for it's rock solid dependability but I really...
  7. Nolan M

    Th400 slipping

    So I just bought a 1984 c30 knowing it was missing reverse. I drove it home (about 30 miles) with no problem just riding in second at 40 mph because it had bad tires. Replaced the tires and took it for a drive. It shifted fine between 1 and 2 but wouldn’t go to 3, checked the trans fluid and...

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