Testing a Vacume Modulator on a TH 350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

VanceH · 01-27-2010, 02:51 PM

Is there a way to test this and see if it is working? After removing my front drive shaft on my 4x4 i am having issues with the tranny. It is shifting WAY late into 3rd and i have no down shift at all, you let off the gas and it feels like it is free wheeling. I was running it around last night and came down a hill and it shifted, was ok for a bit then went back to no down shift. from the research i found i am thinking it might be the Vacuum modulator?

01-27-2010, 02:51 PM	#1
VanceH Loving the Jimmster Join Date: Jun 2008 Location: Emmett, idaho Posts: 575	Testing a Vacume Modulator on a TH 350 Is there a way to test this and see if it is working? After removing my front drive shaft on my 4x4 i am having issues with the tranny. It is shifting WAY late into 3rd and i have no down shift at all, you let off the gas and it feels like it is free wheeling. I was running it around last night and came down a hill and it shifted, was ok for a bit then went back to no down shift. from the research i found i am thinking it might be the Vacuum modulator?

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