<VV> my first solo in my third Corvair (3rd meaning 1st usable)

[FrankCB at aol.com]

I'd say if you notice a very harsh and abrupt downshift back to low as you  
slow to a stop, then check the rubber hose connection going into the  
modulator.  Ours was leaking thereby eliminating most of the vacuum that  tells the PG 
to do a easy, gentle downshift.  If that doesn't solve the  problem, then you 
may have a leak elsewhere in the connection line or even a bad  modulator.
    Frank "check easy stuff FIRST" Burkhard
 
 
In a message dated 7/22/2008 9:31:41 A.M. Eastern Daylight Time, jld at wk.net  
writes:

The  modulator only controls the harshness of the low-high up-shift 
and  down-shift.  It modulates line pressure in the control body.  If  
the engine vacuum is greater than the spring point (about 16 inches 
of  Hg), the line pressure is reduced.   This simply keeps the  
transmission from making harsh shifts at part throttle.  The position  
of the throttle valve (TV) is the main controller of line pressure in  
the transmission or how tightly the clutch and bands are clamped when  
in gear.  The governor is one of the items that controls the shift  
points.  The throttle valve , governor, and springs in the control  
body all help determine the shift point.

One of the symptoms of a  broken "E" clip, is a failure to shift out 
of low.   You can  sometimes force a shift to high with broken "E" 
clip by driving the car to  about 25 mph with drive selected, backing 
of on the throttle, shift to  neutral, rev the engine slightly, and 
shifting back to drive.  This  doesn't work if the shift valve is 
jammed in the low position by a broken  piece of the "E" clip.

A slipping high clutch is usually a misadjusted  TV rod, or worn 
clutch plates.
Jim  Davis





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