Posted by Ken (32.102.155.5) on April 24, 2001 at 00:32:55:
In Reply to: C-4 Band Adjustment posted by David Drown on April 23, 2001 at 18:21:11:
David,the bands being referred to are like wide strips of thin,strong metal that have a friction lining material attached and encircle a metal drumlike wheel so that when a shift or gear change takes place, the hydraulic
actuation of a part called a servo will draw this band tightly around this drum thus locking them togather preventing the drum from turning and causing other actions to occurr within the transmission gear operation.
As the lining wears, the servo must move a longer distance.This has effects upon the shift quality and left go to long,slipping occurrs.
There are other reasons for poor trans operation as there are many other parts in an automatic trans.
In addition, the lining as mentioned is one reason why the different types of fluids are specified for each make of trans.
These unit are complex in operation and there is much more to it. My explanation for the band/servo is simplified and limited so you have some chance to understand what they are and do.
On the C4 the band are adjustable from the out side to take up for the lining wear (within limit) before replacement in needed.
Hope this has helped.
Ken