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Transmission removal

Tiny
TWEBB101
  • MEMBER
  • 1984 CHEVROLET TRUCK
  • 7.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 1 MILES
How much ground clearance is needed to remove the transmission? I'd like to remove it, bolt to my new engine, and then reinstall the whole package together.
Thursday, June 3rd, 2021 AT 7:51 AM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

You will need at least 3 to 3 1/2 feet. When you remove it, take it off the jack and set it on some plywood so you can drag it out the side of the truck. The tallest part is the bell housing with the converter.

Be careful and make sure you do not remove the converter. Leave it in the transmission. You do not want to damage the seal or bushing.

Roy
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Thursday, June 3rd, 2021 AT 8:04 AM
Tiny
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  • 157 POSTS
Roy, when we pulled the engine out, the converter came with it, attached to the flexplate. After I removed it from the flexplate, I put the converter back on the transmission in the truck, making sure to seat it down. Should I be worried about the seal or bushing? Are they ok? Do they need to be replaced?
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Friday, July 2nd, 2021 AT 6:45 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes. I would remove the converter again and replace the seal. It most likely got damaged when removing the motor. The smallest knick in the seal will result in a leak.

Roy
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Saturday, July 3rd, 2021 AT 3:37 AM
Tiny
TWEBB101
  • MEMBER
  • 157 POSTS
I was able to remove the transmission last weekend; dropped out fairly easy. While underneath, I noticed that the 2 sections of driveline were starting to separate, exposing the splines. I'd like to re-grease those splines and push the sections back together. Any recommendations on the type of grease to use?
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Tuesday, July 13th, 2021 AT 12:20 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I use Mobil 1 synthetic grease for lubing the splines. It will not break down when it gets hot.

Roy
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Tuesday, July 13th, 2021 AT 2:02 PM
Tiny
TWEBB101
  • MEMBER
  • 157 POSTS
Do you have the resources to decode this tag? I can't find anything online for it.
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Friday, July 16th, 2021 AT 9:48 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Can you take a picture of the transmission pan for me?

Roy
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Friday, July 16th, 2021 AT 10:07 AM
Tiny
TWEBB101
  • MEMBER
  • 157 POSTS
I've already pulled it; here's a pic of the whole thing. I'm pretty sure it's a THM400, but I didn't know if there were any specifics from that tag. Here's a pic of the whole thing.
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Friday, July 16th, 2021 AT 10:10 AM
Tiny
ASEMASTER6371
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Okay, that is not the pan but good enough.

That is a turbo 400 long tail.

The modulator valve on the side is the key.

Roy
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Friday, July 16th, 2021 AT 10:19 AM

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