Automatic Transmission - 4l60e-excessive input shaft endplay??




lt170chevelle
04-05-2012, 05:19 PM
Im going through my 4l60e after a previous rebuid and lost 3-4 clutches and burned up stall converter. I put it back together and notice there is about a 1/4" of endplay in the input shaft?!? I dont understand whats wrong here. I double checked for the correct stackup of bearings and washers and i still have this much endplay. I didnt notice anything that could amount to this during rebuild.
Anybody have this problem before? It is directly related to my failure and im afraid to shim it that much on the input drum.


mrvedit
04-06-2012, 08:13 PM
I know you read over the posts in the following similar thread, because you posted there too:

http://ls1tech.com/forums/automatic-transmission/1034773-4l60e-endplay-issues.html

Anyway, I just happen right now to have a partially assembled trans with only the pump removed. It has a tight 0.015" of endplay. I put a straightedge over the case tabs that bolt to the pump. I then measured exactly 0.125" of space between this line and the top of the reverse drum. In other words there is 0.125" of space between the reverse drum and the pump; a plastic washer takes up most of that.
Also, with the pump off, I can lift the input shaft about 0.050 before it starts to lift the reverse drum.

This might help you determine where your problem is. If your reverse drum is sitting much (e.g. 1/4") lower than mine, then your sun shell is likely sitting too low.
If the reverse drum is in the correct position, then your input drum is sitting too low, perhaps due to something missing in the front planetary.

Sorry, I don't have enough experience to pinpoint your problem, but perhaps that helps. Also, did you replace any hard parts?

MikeyZ
04-07-2012, 02:28 AM
http://www.greaterdimensions.com/Greater_Dimensions_700R4-4L60E_Pump_Bearing_Kit_Tech.html

you dont happen to have this do you?


MikeyZ
04-07-2012, 02:34 AM
http://www.transmissioncenter.org/IMG_1076.JPG

Or if your reaction carrier looks like

http://www.transmissioncenter.net/IMG_0847.JPG

you need a bearing on there

lt170chevelle
04-07-2012, 07:06 AM
Guys thanks for your great info.. I actually stumbled across the problem yesterday as I removed the rear reaction carier .the case where the bearing rides was starved ov oil and and grounded down the cases snout down to the snapring and upon removal ov the ring it pulled the remaining materail with it.. so now it will not hold a snap ring.
I doubt its fixable and trashed beyond repair.
Really bummed as I was just finishing the rebuild when the endplay was noticed

SparkyJJO
04-07-2012, 09:21 AM
Better to find that now than after it is installed and blows on you.