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#1 (permalink) |
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Junior Member
Join Date: Mar 2007
Location: Wilmington
Posts: 3
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455 to 425 th400 swap?
i found a great deal on a th400 that was pulled from a mid 70's 455 olds. was wondering if it will bolt up to my 425 1967 delta 88 with th400?
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#2 (permalink) |
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Senior Member
Join Date: Oct 2005
Location: NJ
Posts: 349
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It will bolt but the flywheel bolt pattern is different so you need to use the 425 flywheel. The 67 also used the switch pitch and the later is not. This should not be a problem.
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#3 (permalink) |
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Freedom Fighter
Join Date: Feb 2007
Location: Nine Mile Falls, Washington
Posts: 107
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Switch pitch?
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#4 (permalink) |
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Senior Member
Join Date: Oct 2005
Location: NJ
Posts: 349
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The switch pitch was a type of early lock-up torque converter and trans. Olds used it on the turbo 400 from 65 to 67. On the throttle linkage under the hood near firewall there is a switch mechanism that controls the switch pitch and also kickdown for passing gear I believe. The factory shop manual has info about the switch pitch.....maybe others can elaborate on this.
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#5 (permalink) |
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Freedom Fighter
Join Date: Feb 2007
Location: Nine Mile Falls, Washington
Posts: 107
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Everyday I learn
something new about the 'Olds' world. Being a traditional 'bowtie' guy from birth, I was sheltered from this wonderful invention.I also was smart and bought a factory service manual for 67 Olds. Here is the information from that publication: "The stator control solenoid is activated from a switch in the throttle linkage at engine idle which changes the stator blade angle (pitch)from low to high. It is also energized at 40 degrees and over of carburator opening by a switch in the throttle linkage to change the stator blades from low angle to high angle." Hope this helps others, it did me. Dave |
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