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700R4 downshifts from OD to D on highway

Thanks for the replys, I down shifted after it had done this yesterday and sure enough it is the torque converter locking and unlocking. it just seems to do it so much I thought It was downshifting. I was hoping that was part of the reason for my poor fuel economy (was much better on gas when...
- Trucknut25
- Post #7
- Apr 17, 2019
- Forum: Transmissions
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

Not much has happened for a while, Having a new house built on 8 acres has consumed my time for the last 4-5 months. House should be done by the end of this month. The tired 5.7 let go on me a few weeks ago. Lost oil pressure, blew head gasket and started knocking all in one. pulled the...
- Trucknut25
- Post #2
- Apr 4, 2018
- Forum: Offroad Build Threads
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

Well for those that are curious K&W Block sealer works. I bought a can at autozone for 8.99 and put it in the radiator. Filled the coolant, checked the oil and took her for a ride for about 45 minutes. It ran a little ruff for the first 5 minutes then cleared right out, stopped smoking and...
- Trucknut25
- Post #14
- Jun 15, 2017
- Forum: Engine Performance + Maintenance
89 5.7/auto gray smoke out drivers exhaust calling all TBI experts

My uncle swears by k&w block sealer, used it in his peterbuilt. I was thinking about giving it a try. Can't hurt Sent from my iPhone using Tapatalk
- Trucknut25
- Post #13
- May 24, 2017
- Forum: Engine Performance + Maintenance
89 5.7/auto gray smoke out drivers exhaust calling all TBI experts

Well got the compression test done, 110 lbs on every cylinder but one, which had 100 lbs. But I noticed that the cylinder that had 100 lbs when I pulled the plug, coolant ran out of the plug. So im sure its a cracked head or gaskets. But at 341k Im not interested in fixing that issue. Ive...
- Trucknut25
- Post #10
- May 13, 2017
- Forum: Engine Performance + Maintenance
89 5.7/auto gray smoke out drivers exhaust calling all TBI experts

No water in the oil or on the cap. Trans isn't loosing fluid either. Hope to have time to check compression this weekend Sent from my iPhone using Tapatalk
- Trucknut25
- Post #7
- May 9, 2017
- Forum: Engine Performance + Maintenance
89 5.7/auto gray smoke out drivers exhaust calling all TBI experts

It runs good actually. I haven't pulled the plugs yet. The old ones were good looking, but 3 where wet and it had been a few days since it was started Sent from my iPhone using Tapatalk
- Trucknut25
- Post #5
- May 9, 2017
- Forum: Engine Performance + Maintenance
89 5.7/auto gray smoke out drivers exhaust calling all TBI experts

I have not yet, Im picking up a compression check kit today to see what the results are though.
- Trucknut25
- Post #3
- May 8, 2017
- Forum: Engine Performance + Maintenance
Cooling system mess...help me out

I havent tried this this on our trucks, but have seen it done on a toyota. Take the dip stick out, get a balloon and a zip tie and fasten the balloon over the dip stick tube. Start the truck, if it fills up with air you have pressure in the engine, good posibly of a blown head gasket/crack...
- Trucknut25
- Post #2
- May 6, 2017
- Forum: Engine Performance + Maintenance
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