<TABLE border=0 width="100%" itxtNodeId="584" itxtHarvested="0"><TBODY itxtNodeId="585" itxtHarvested="0"><TR itxtNodeId="587" itxtHarvested="0"><TD vAlign=top width="100%" itxtNodeId="588" itxtHarvested="0">I just purchased this truck in february. I am having issues with the transmission slamming into gear(E40D). Sometimes it shifts ok sometimes it slips. 200,000 miles. Where should I start? Flush and fill with new filter and fluid? </TD></TR></TBODY></TABLE>

<TABLE border=0 width="100%" itxtNodeId="584" itxtHarvested="0"><TBODY itxtNodeId="585" itxtHarvested="0"><TR itxtNodeId="587" itxtHarvested="0"><TD vAlign=top width="100%" itxtNodeId="588" itxtHarvested="0">I just purchased this truck in february. I am having issues with the transmission slamming into gear(E40D). Sometimes it shifts ok sometimes it slips. 200,000 miles. Where should I start? Flush and fill with new filter and fluid? </TD></TR></TBODY></TABLE>I have a 97 F350 dually 2wd. It is shifting hard thru all gears. The truck has 200,000 miles. I do not know the history. Should I start with a flush and fill/ new filter and Lucas transmission fix? I have heard you can reset the main computer.
<TABLE border=0 width="100%" itxtNodeId="584" itxtHarvested="0"><TBODY itxtNodeId="585" itxtHarvested="0"><TR itxtNodeId="587" itxtHarvested="0"><TD vAlign=top width="100%" itxtNodeId="588" itxtHarvested="0">I just purchased this truck in february. I am having issues with the transmission slamming into gear(E40D). Sometimes it shifts ok sometimes it slips. 200,000 miles. Where should I start? Flush and fill with new filter and fluid? </TD></TR></TBODY></TABLE>

 

Does the overdrive light flash when it's shifting hard?

 

No it doesnt.

 

I would start with a fluid and filter change and see what kind of mess is in the pan

 

Here is a great method for transmission fluid replacement, written by Mark Kovalsky. Click Here!

I did it back when my truck still had the automatic in it. It didn't fix my problem, which I only found out later was being caused by a P0500, but it did work nicely and easily to replace all of the fluid. I would recommend this method.

 

Thanks guys I appreciate all the info, I'll let you know how it works.

 

Check the VSS (Vehicle Speed Sensor) in the rear differential too (especially if the speedometer "bounces" as you drive). It can cause all sorts of shifting issues. Check the brake lights as well. Believe it or not they can screw with the way these things shift.

 

The place to start is checking for transmission codes.

 

Mark can there be codes without the OD light flashing?

 

Yes there can.