455 to 425 th400 swap?

delta88NC · 03-27-2007, 08:08 AM

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?

Oldsmaniac · 03-27-2007, 08:23 AM

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.

frdmftr · 03-27-2007, 12:27 PM

Switch pitch?

Oldsmaniac · 03-27-2007, 01:12 PM

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.

frdmftr · 03-27-2007, 03:53 PM

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

03-27-2007, 08:08 AM	#1 (permalink)
delta88NC Junior Member Join Date: Mar 2007 Location: Wilmington Posts: 3	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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03-27-2007, 08:23 AM	#2 (permalink)
Oldsmaniac Senior Member Join Date: Oct 2005 Location: NJ Posts: 349	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.

03-27-2007, 12:27 PM	#3 (permalink)
frdmftr Freedom Fighter Join Date: Feb 2007 Location: Nine Mile Falls, Washington Posts: 107	Switch pitch?

03-27-2007, 01:12 PM	#4 (permalink)
Oldsmaniac Senior Member Join Date: Oct 2005 Location: NJ Posts: 349	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.

03-27-2007, 03:53 PM	#5 (permalink)
frdmftr Freedom Fighter Join Date: Feb 2007 Location: Nine Mile Falls, Washington Posts: 107	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