TH400 late 2-3 upshift
Thread Starter
Registered User
Joined: Nov 2014
Posts: 3
Likes: 0
From: Omaha,NE
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.
Thread Starter
Registered User
Joined: Nov 2014
Posts: 3
Likes: 0
From: Omaha,NE
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?
