TH400 late 2-3 upshift
12-07-2014, 06:37 PM
#1
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TH400 late 2-3 upshift Th400 with mild rebuild. late 2-3 upshift at light and heavy throttle. Used a PATC K7 kit with stock converter. Auto shift with Fairbanks trans action kit on lowest setting. Dual fed direct. Worse when cold. I bought a governor weight kit but found trans already has the heavy weights installed. While checking modulator operation I found the modulator valve outer large land sticking in case. Thinking this is my problem I carefully polished the land with 1500 grit sandpaper until it was free in the bore. Now the problem is worse. I didnt take any more than .001" off the land. Thank You for any ideas on this.
12-08-2014, 06:42 PM
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Trans also has new detent solenoid with rubber gasket built in. detent wire is disconnected.
Pressure readings @ idle
P=75
R=120
N=75
D=75
L2=160
L1=160
@ 60 MPH in 3rd 68 psi
Is this lower pressure in 3rd normal or an indication of a leak in the direct circuit?
Pressure readings @ idle
P=75
R=120
N=75
D=75
L2=160
L1=160
@ 60 MPH in 3rd 68 psi
Is this lower pressure in 3rd normal or an indication of a leak in the direct circuit?
12-11-2014, 10:45 AM
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Any opinions or elaboration on 3rd gear cutback mod to modulator valve? What application is this mod used for? How would this affect auto shift behaviour?