Auto trans issues please help - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 4 (permalink) Old 12-21-2014, 09:09 PM Thread Starter
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Auto trans issues please help

I'm not very familiar with the ford auto transmission. When I let off the accel pedal it feels like the drive line is clunking. The same goes for stepping on the on the accel pedal, it seems to clunk a bit. You cant so much hear it as much as you feel it. The truck is getting close to 90k on it and I know it hasn't been beaten at all. front and rear diffs are tight, all u joints are fine. I'm leading toward a converter at this point. It also has a slight rough idle (engine is solid with no issues) but runs great under acceleration and deceleration. Trans shifts as it should. Anything to look out for would be a great help and much appreciated. Thanks in advance.
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post #2 of 4 (permalink) Old 12-22-2014, 12:43 AM
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Re: Auto trans issues please help

check the slip yoke in the driveshaft.

What kind of truck? No year, model, engine, etc

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post #3 of 4 (permalink) Old 12-22-2014, 01:31 AM Thread Starter
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Re: Auto trans issues please help

2002 f250 7.3 auto. Everything I can put my hands on within the drive line is tight. I'm the lead tech at a international dealership. I know eaton and Allison transmissions. I know they put this ford trans in the CF model cab overs but the engines (VT275) never seem to last long enough or put out enough power to give these trans any issues in those so I hardly ever deal with them, plus I do most of the heavy diag and engine repairs. Slip yoke would be great, drive shafts are fairly cheap unlike trannies and converters.
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post #4 of 4 (permalink) Old 12-22-2014, 07:12 PM
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Re: Auto trans issues please help

Quote:
Originally Posted by justinstorm77 View Post
2002 f250 7.3 auto. Everything I can put my hands on within the drive line is tight.
No it isn't. I've looked at many, many, many of these and I never saw one that didn't have a lot of lash in the rear axle. That causes the clunk. It isn't in the transmission.

Quote:
Originally Posted by justinstorm77 View Post
I know they put this ford trans in the CF model cab overs
No, they never put this transmission in the CF cabover. It's successor, the 5R110, was in the CF. Similar, but a different transmission. The transmission you have is a 4R100.

Quote:
Originally Posted by justinstorm77 View Post
Slip yoke would be great, drive shafts are fairly cheap unlike trannies and converters.
Ford sells a special grease just for the slip yokes. It works really well. The slip yokes tend to bind and cause clunks, but usually not under the conditions you are describing. It is probably worth a try.

Mark
Former Ford Automatic Transmission Engineer

“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson
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