Thread:

05 F250 Diesel Tranny Noise

My brothers truck goes into a tranny slip sounding noise when towing up hill sometimes. The first time this happened was about a year ago. He took it to the dealership and they cleaned out the coaking deposits inside the turbo which they said was throwing the tranny into some electronic problem. The same problem happened again yesterday towing over the grapevine. We took it to the dealership and based on what we explained, the service guy thinks it's the fan clutch engaging. He said that maybe the fluid got hot and kicked the fan on. The temp gauge was in the normal range and the fluid was changed about 3,000 miles ago. We were towing 4500 lbs. The truck has 78,000 miles on it. Has anybody experienced the same situation?


Geoff

Were you able to get this figured out? Was there any noticeable drivability issue or higher than normal RPM when it was happening or just the noise?

Originally Posted by g935

My brothers truck goes into a tranny slip sounding noise when towing up hill sometimes. The first time this happened was about a year ago. He took it to the dealership and they cleaned out the coaking deposits inside the turbo which they said was throwing the tranny into some electronic problem. The same problem happened again yesterday towing over the grapevine. We took it to the dealership and based on what we explained, the service guy thinks it's the fan clutch engaging. He said that maybe the fluid got hot and kicked the fan on. The temp gauge was in the normal range and the fluid was changed about 3,000 miles ago. We were towing 4500 lbs. The truck has 78,000 miles on it. Has anybody experienced the same situation?


Geoff

When the clutch fan kicks on in the powerstroke, it does so with a vengeance and roars loudly..which will even slow you down a little. Do the RPM's go up when this happens? If they don't i'd imagine it's the clutch fan.

Originally Posted by ATS_Diesel_Tech

Were you able to get this figured out? Was there any noticeable drivability issue or higher than normal RPM when it was happening or just the noise?

The dealer found a TSB or something like that describing similar symptoms. They are going to re flash the tranny tomorrow. On thursday, I'm taking another trip with the truck and Ford is installing a recording device. If the trans. slips or if the the truck loses power towing uphill again I am to push a button and this box will record 10 minutes of everything going on. They will download the box and see what happened.

Originally Posted by Tahiti Boss21

When the clutch fan kicks on in the powerstroke, it does so with a vengeance and roars loudly..which will even slow you down a little. Do the RPM's go up when this happens? If they don't i'd imagine it's the clutch fan.

The rpm's do go up. I can push on the pedal and rpms will climb to 3500 if I'm not carefull. The slip starts out slow and steady. I can feel it coming on. If I get out of the throttle and then back on, it will load up again most of the time. Last weekend, I had to fight it coming back over the grapevine for about 5 miles before I got it to load the motor again.

Update on the tranny issue. The local dealership updated the mapping on the tranny. I drove the truck about 20 miles and the check engine light came on. I brought the truck back and they said that It needed a crankcase temperature control part of some kind and that it would cost 2500 to replace along with something else down there. OK, so off to Parker I go a few days later. Coming back through barstow and climbing about 2500 feet on a long gradual grade, it starts to slip again. Not as bad as before but definitly a slip noise. It did it only once. It didn't slip over the Tehachapi grade which is 4100 feet. No check engine light came on. So, I'm back to square one.


Geoff

g935. Please call John Wood at www.jwtt.com. He is an avid ford tranny guy, and messes alot with the 6.0 5 speed autos. He is a great guy and will likely steer iyou in the right direction. I have one of his tranny's in my 7.3 litre, top notch!

Geoff-
Keep a close eye on the level and color/smell of the ATF for any changes. If something is slipping or shearing in the trans/converter it could start to burn. Bellflower Transmission also does a great job if you are by that area. Larry will go the extra mile to make sure things are figured out. 866-408-6814