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700R4 downshifts from OD to D on highway

Hi Everyone, Looking for a little help/info. My 89 K1500 has a 700R4 / 5.7 3.42 gears. I've been driving it to work lately due to picking up building supplies and have noticed that on the highway it is downshifting out of OD frequently. Seems to happen any time I go over about 2300 rpms. I...
- Trucknut25
- Thread
- Apr 12, 2019
- Replies: 9
- Forum: Transmissions
My DD/Weekend warrior/toy & Junkyard scores

Lurked long enough thought it was time to post a build thread. Bought my 89 reg cab short bed K1500 for 1100 delivered. Had 338k on the clock, 80K on trans, most likely original motor. First day in the driveway K1500 Day 1 by Trucknut25 posted Jul 25, 2017 at 10:02 AM First thing I had to do...
- Trucknut25
- Thread
- Jul 25, 2017
- Replies: 2
- Forum: Offroad Build Threads
89 5.7/auto gray smoke out drivers exhaust calling all TBI experts

Long time lurker, first post. I've searched and not found anything. Calling all TBI experts I need some help! 89 k1500 w/ 5.7 / 700R4 341xxx Has no cats, and cherry bombs. I bought it about a year ago and have been slowly putting it back in running condition. Has run good for a while, but...
- Trucknut25
- Thread
- May 6, 2017
- Replies: 13
- Forum: Engine Performance + Maintenance