1990 Ford Ranger Pick-up Malfunction - Drive Train & Driveline

Question: When it gets to 45 mph the transmission shifts very erradically with no extra gas pedal pressure.When I give it gas it shifts fine untill I maintain constant pressure then it starts to shift back and forth again.All fluid levels are fine.At first, I could unhook the battery overnight and then it would run fine.But the running fine periods got shorter and shorter and now dosen't help at all.

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Technican: About 45mph is when the torque converter clutch should engage for the lowest possible engine RPM to effect the best fuel mileage. There is a solenoid that controls this clutch and I believe your transmission is likely just fine, but, this TCC solenoid is failing. It won't stay 'on'. The TCC solenoid is inside the trans pan and I recommend you have a tranny technician verify your complaint on a road test with you and estimate the repair for your decision. Many shops can do this from a Ford dealer to a national chain store like AMMCO, or, a reliable independant. Your thoughts?

Owner: where would I buy this part?

Technican: Don't buy 'til you verify, you can get it at a Ford Dealer, or, most any national chain transmission shop. I haven't tried a parts store like Pep Boys for such a part....and electrical parts are usually not returnable, so, a road test with a good tech is worth your time.

Technican: Are you there?

Owner: , Sorry for the delay but I am on vacation.I will be back home around july 12.I will have someone check out you suggestion then.This vacation came suddenly and I could not pass it up.

Technican: Have fun! God keep you safe.

Owner: , Sorry for the delay.My wife and I just spent 2 weeks in Hawaii.I've never had such a wonderful vacation in my life.Kauai is the most beautiful place on earth.If there is a garden of eden, it must look like Kauai.Anyway back to reality, Haven't had time to get a tech ride in the truck yet, but I have noticed one thing, there seems to be a small amount of transmission fluid in the vacum hose coming from this clutch soleniod.Does this mean it is bad?

Technican: Provided the vacuum hose connected to the clutch solenoid is intended to actuate a diaphram (or the like) to turn on/off the solenoid's output it certainly must be fluid tight. So, yes Sir, any fluid in the vacuum line is headed for the engine intake manifold and proves the component to be leaking. You've found a problem. I'd replace the solenoid under preventive maintenance and hope it fixes the question, too! If it doesn't, you've outran an impending failure. My daughter is traveling in England with her college journalism class. She thinks the garden of eden in the rolling hills of Whales. Glad you had a great vacation!

Owner: , I have come across two parts for an a4ld transmission, one is called a lock-up soleniod and the other is called a convertor clutch overdrive connector.Is the lock-up soleniod all I need to get? I found these parts at bulkparts.com

Technican: Tough call. If your connector has any damage and doesn't make proper contact, it might be needed... The lock-up solenoid is needed in my opinion. It leaks, right?

Technican: What is the status here, please?

Owner: , Thanks for all the help.The problem was the vacuum diaphram.I ordered one from macco, it had an adjustable whell on it. At first I didn't think it was going to work, but I didn't have the vacuum opened up enough.That was causing the gears to shift too early.Just like the condition with the leaking vacuum diaphram.Like I said, after adjusting the new diaphram, the transmission is working fine now.Thank you for your advice and the next time I need some expertise I will seek yours. Doug

Technican: Thanks Doug! Will you please close the question on your screen and accept my answer so that I may get paid and move on? It is a pleasure to have worked with you.

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