L4N71B Filter bolt spinning

[jakebson]

Dropped the pan on my 87 D21 today to change the fluid and replace the filter. One of 3 larger bolts on the filter just spins and won't come out. The filter didn't look very bad so I put everything back together and topped the fluid off. I want to know how to address so that I can service it again soon and actually change the filter. Including a pic of the bolt in question.

 

The fluid was not looking great and I don't know the service history of the truck. It shifts pretty well, but it revs a little high on the first shift or 2 from 1st to 2nd after starting. A little rougher than normal, but not a major jerk or anything. Is that normal behavior for this transmission?

 

Thanks,

Jake

[datzenmike]

The pan is only secured by the one bolt? Try (gently), to pry down on the pan while turning the bolt. This will provide a leverage in the direction it want's to go.

 

The slightly high shift points is likely because it's cold. You could let it warm up for twenty minutes then drive and see if the shift has changed. Fluid and filter change might change it.

[jakebson]

1 minute ago, datzenmike said:

The pan is only secured by the one bolt? Try (gently), to pry down on the pan while turning the bolt. This will provide a leverage in the direction it want's to go.

 

The slightly high shift points is likely because it's cold. You could let it warm up for twenty minutes then drive and see if the shift has changed. Fluid and filter change might change it.

 

The rest of the bolts came out easily, just that one pictured would not. There were 3 with a 10mm hex and around 10 bolts with an 8mm hex. The one 10mm bolt remaining in the picture just kept spinning continuously. I did try to gently pry on it with a flat blade. I was afraid to put much pressure on it though, because I did not want to damage anything in case I couldn't get it out.