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Replacing a 4l80e with an 88 700r4 or off a heavy half ton truck

Tiny
CODY FINNECY
  • MEMBER
  • 1993 CHEVROLET 2500
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
After I replaced the transmission filter and fluid in a 700r4 out of my 1988 heavy half ton I put in my 1993 Chevrolet 2500 which previously had a 4l80e. I’ve gotten the drive shaft and everything bolted up. However, it seems that my shift linkage isn’t lining up and when I crawl under and shift it by hand the truck acts as if my brakes were locked up. And also are the transmission cooler lines routed the same.
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Monday, April 15th, 2019 AT 10:05 PM

10 Replies

Tiny
ASEMASTER6371
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Good morning,

You most likely will need to remove the linkage from the original transmission and install it on the donor transmission. Then see if it lines up.

As far as the cooler lines, you will probably need to move them around to line up. There are minor differences for the alignment.

Roy
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Tuesday, April 16th, 2019 AT 3:14 AM
Tiny
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Also, what do I need to do in order for my TCC to work properly? Like I said this truck previously had a 4l80e in it.
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Tuesday, April 16th, 2019 AT 12:47 PM
Tiny
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Do you have a code for this?

Is this a new or used transmission?

Roy
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Tuesday, April 16th, 2019 AT 1:24 PM
Tiny
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It’s used, it’s coming out of my 1988 Chevrolet heavy half ton.
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Tuesday, April 16th, 2019 AT 9:48 PM
Tiny
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And no code.
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Tuesday, April 16th, 2019 AT 9:48 PM
Tiny
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Do you have a scan tool to read the live data for the transmission?

Roy
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Wednesday, April 17th, 2019 AT 12:00 AM
Tiny
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Update: it’s been about six months since the last time I cranked the truck. I just cranked it and it will go into neutral and all forward gears but it won’t find reverse and also I have to pull up on the shifter in order to turn my key all the way off. So if I was to guess, I’d say it was my linkage all along. Just a little awkward to adjust by your self.
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Wednesday, April 17th, 2019 AT 2:15 PM
Tiny
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Yes, I agree.

Take your time and adjust it correctly and see if you get all the gears.

Roy
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Wednesday, April 17th, 2019 AT 2:17 PM
Tiny
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When I crawl under the truck and shift it manually it won’t go into reverse.
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Saturday, April 20th, 2019 AT 1:04 PM
Tiny
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Got it.

It sounds like you have an internal issue with the transmission.

Sounds like a bad transmission.

Roy
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Saturday, April 20th, 2019 AT 1:10 PM

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