I slid my transmission back 1to 2 inches to remove the oil pan. While down there, I changed the transmission filter and fluid. Now when I drive, it slips . I have an automatic transmission. Can someone please explain what is going on?

 

How did you slide the transmission back 1 or 2 inches???

If you unbolted the bell housing from the engine you have to also unbolt the torque converter from the flexplate.

The torque converter powers the Front pump(main pump) by slots in the end that is inside the transmission, if you slide the transmission back without unbolting torque converter then the slots will often not slide back into place correctly and you will damage the front pump, causing total failure or low pressure, slipping.

Google: how to install a torque converter automatic transmission

This will show you the alignment issues and why you need to have the torque converter unhooked from flexplate any time bell housing is pulled back.

If the bell housing didn't slide all the way back flush against block when reassembling, and you had to use the bolts to pull engine and trans together, then damage did occur.
And automatic should slide up flush against engine with almost no effort, then bolt are used to hold it there not force it together.

 

RonD, thank you for your reply. I unboltedthe bell housing from the engine, removed the drive shaft, and removed the two bolts from the mount. I was able to slide the transmission back enough to clear the oil pan. That's all I needed.

 

You probably messed up the front pump then, since torque converter wasn't detached.
It is a big deal since full rebuild is needed to get to front pump.

How did it go back together?
easy, just slid back into place
or did you have to use the bolts to snug up(force) trans to engine

Look at the pictures of torque converters seen here: http://www.hotrod.com/how-to/transmi...ue-converters/
You will see the two slots, 1 to 2 inches deep, they drive the front pump, which has two "tabs" that need to line up with the slots, if they are not lined up you can still bolt the trans to engine but it won't slide in easy and flush, you will have to tighten bolts to get trans flush with engine, than that breaks the front pump "tabs".


I assume you didn't disconnect the wiring on trans, you could check that both sides are hooked up