TH700R4 through 4L70E tips and tricks

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 == Pump Modifications ==
-Early 700r4-4L60 pump covers (stator support) have an extra bleed hole in the 3-4 clutch circuit that can be plugged off.  GM eliminated this hole in the 1990's.
+===Drain back hole behind front seal===
-Drain back holes from behind the converter hub seal should be enlarged in some pumps. This is year dependent since GM did enlarge the holes in the late 1980's. The matching hole on the pump cover (stator support shown in yellow circle) should be enlarged too.
+Drain back holes from behind the converter hub seal at the bushing  should be enlarged in some pumps. This is year dependent since GM did enlarge this hole in the late 1980's.
+[[image:Drillhole2.jpg]]
+The matching hole on the pump cover stator support (shown in yellow circle) should be enlarged too.
 [[image:Drain_back_hole.jpg]]
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 ===3-4 clutch oil passage===
+Early 700r4-4L60 pump covers (stator support) have an extra bleed hole in the 3-4 clutch circuit that can be plugged off.
 Modification for better 3-4 clutch pack apply on early pumps. The circled hole can be tapped and plugged with a 5/16 inch set screw.  GM deleted this hole in later pumps

Revision as of 22:30, 20 August 2010