- Joined
- Dec 26, 2023
- Messages
- 2
- Reaction score
- 2
- Points
- 3
- Location
- Oregon
- Vehicle Year
- 1995
- Make / Model
- Ranger 4.0
- Transmission
- Automatic
Hello, I’ve got a problem and I was hoping for some guidance. I have a 1995 ranger with the 4.0 engine and a 4r55e automatic transmission. I noticed about a month ago that when accelerating from stop lights, I’d sometimes hear what sounded like a creak, which I assumed was a suspension issue of some kind. However more recently, it’s gotten worse and will now occasionally sustain the noise for several seconds. It will also make the growling noise when accelerating hard while in motion, sometimes. I thought that it might be the driveshaft u joints, so I did an experiment and put the car in drive and held the brake while I gave it some gas, and the noise appeared, so I think I can rule out the driveshaft. It only makes the noise in drive, manual 1st and manual 2nd, not in park, neutral or reverse, so I think I can rule out both the engine and the torque converter. So I believe it to be a transmission issue. The thing is it only happens when the transmission is under torque. If I gently roll away from a stoplight or have my foot on the brake idling, it’s fine. The noise doesn’t happen until I give it some gas. My understanding is that if the clutches were worn out it would be present when idling and go away when you give it gas, and that slipping transmissions sound more like a sandpapery whirring than a growl. I can’t find anything online describing what I’m experiencing. So basically I’m hoping someone here might have experienced a similar issue and can give me some guidance on how to go about troubleshooting this.
a link to a recording I made is here. This was taken in my driveway with thecar in gear, foot on the brake.
Thanks!
I will add that I’m working on tracking down an engine lean code, my fuel trims are consistently way too high, but I don’t think it’s related. But maybe worth throwing out there. I found a manual that talked about the TPS sensor and MAF sensors having an effect on transmission operation.
Edit the next day, I just did a pressure test. Idle pressures seem ok, but when doing the WOT test in drive they would jump up and then immediately drop to 120 PSI. Spec is 207 to 241. For giggles I did a WOT pressure test in reverse, and the pressure was good although I was not able to reach a stall speed, RPMs went way high before I aborted the test. According to my manual (link below) a low pressure in all forward gears indicates a worn forward clutch, “main control,” or O/D servo. Will be examining the Transmission fluid and dropping the pan next.
Pan was clean, fluid a little dark.
manual link:https://atoc.ru/uploads/manual/5fb798885b58e.pdf
a link to a recording I made is here. This was taken in my driveway with thecar in gear, foot on the brake.
Thanks!
I will add that I’m working on tracking down an engine lean code, my fuel trims are consistently way too high, but I don’t think it’s related. But maybe worth throwing out there. I found a manual that talked about the TPS sensor and MAF sensors having an effect on transmission operation.
Edit the next day, I just did a pressure test. Idle pressures seem ok, but when doing the WOT test in drive they would jump up and then immediately drop to 120 PSI. Spec is 207 to 241. For giggles I did a WOT pressure test in reverse, and the pressure was good although I was not able to reach a stall speed, RPMs went way high before I aborted the test. According to my manual (link below) a low pressure in all forward gears indicates a worn forward clutch, “main control,” or O/D servo. Will be examining the Transmission fluid and dropping the pan next.
Pan was clean, fluid a little dark.
manual link:https://atoc.ru/uploads/manual/5fb798885b58e.pdf
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