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4l80e swapped, no 4th gear

Blew the 4l60e in my 95 so I've put a 4l80e from a 97 in. I have repinned everything correctly and wired in the iss but thats where things get wierd, with it hooked up I get codes 68 and 85 when I unplug it those go away but code 74 shows up naturally. Also for some reason with the tcc solenoid...
- Zacklee420
- Thread
- May 11, 2022
- Replies: 14
- Forum: Transmissions
Z
4l80e swap

So I just did a 4l80e swap in my 95 gmc (was a 4l60e that took a ****) everything is hooked up right but my rpms are way out, 2700/100kph the trans is out of a 97 so the input speed sensor behind the housing on the driver side isn't hooked up. I'm wondering if that sensor is causing the high...
- Zacklee420
- Thread
- Apr 15, 2022
- Replies: 6
- Forum: Transmissions