4L60E Rebuild Help
4L60E Rebuild Help Lost 3/4 the other day, hadn't noticed in slippage before hand just cruising down the interstate and tried to accelerate, acted like it down shifted but RPMs just went up. Let off and drove it on a couple miles to home. After exiting interstate shifted 1/2 fine but no 3/4 at all. Only thing done recently was changing bad front pump. Had about 100 miles on it since pump change.
Tore it down this weekend and started putting back together today. Got everything in the case but noticed the reverse drum (band not on yet) had some play between it and the front pump. Didn't think that should be there so pulled the input shaft assembly, reverse drum and pump and put them together on the bench. Looks like about .200 play that the drum can move up towards the pump. The reverse drum is seated where it should be and the pump is bottomed out too. Putting the pump on w/out the reverse drum there and measuring the distance from end of pump to where o-ring goes on the input shaft gives the same measurement as when the reverse drum is in place.
Should this spacing be there? If not, any idea where to look or what to do? Picture attached, for reference it's the center drum (black line) that's able to move up.
Tore it down this weekend and started putting back together today. Got everything in the case but noticed the reverse drum (band not on yet) had some play between it and the front pump. Didn't think that should be there so pulled the input shaft assembly, reverse drum and pump and put them together on the bench. Looks like about .200 play that the drum can move up towards the pump. The reverse drum is seated where it should be and the pump is bottomed out too. Putting the pump on w/out the reverse drum there and measuring the distance from end of pump to where o-ring goes on the input shaft gives the same measurement as when the reverse drum is in place.
Should this spacing be there? If not, any idea where to look or what to do? Picture attached, for reference it's the center drum (black line) that's able to move up.
Last edited by crewchef; Mar 13, 2006 at 11:10 AM.
I would say the answer to your question is yes the space is there. Your terms are a little off though.The first piece you have on the floor in your pics is called a input drum. The second piece on the input drum is called the reverse input drum. And the last piece is the pump. Hope this helps... 
Cody is correct. Got all bothered by looking at something on the bench that's totally fine when in the case. For reference, when in the case the reverse drum doesn't actually ride against the input drum at all. It and the shell (below input drum) have notches/fingers that interlock. This holds the reverse drum off the input drum and pushes it up close to the input pump. Figured this out last night and finished putting it together. End play was .018/.019. We'll be putting it back in tonight and riding around. Sometimes you think (or worry) too much and get yourself side tracked which is what I did on this one.
