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89 k1500 gets warm only on the highway

So I have a 1989 gmc k1500 and for the last couple weeks I’ve noticed my temp guage slowly creeps up once I get on the highway doing about 60-65mph to about the 230 mark and one I slow back down to 30-40mph the temp drops back to normal, I replaced the thermostat and water pump was replaced a...
- Nopainnogain445
- Thread
- Apr 28, 2024
- Replies: 19
- Forum: Engine Performance + Maintenance
What’s trans do I have

So I have a 89 k1500 with the 5.7tbi and a 5 speed manual. What transmission do I have and will a nv3500 bolt up to it. Thanks
- Nopainnogain445
- Thread
- Oct 10, 2023
- Replies: 6
- Forum: Transmissions