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#1
03-20-2026, 07:55 PM
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TH400 modulator application
Going thru some boxes in garage and came across these modulators.
Wondering what the original applications were. Can’t get into parts lookup, so I thought I would ask y’all. 3027220 3027714 1361577 Thanks Gerry
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1968 Firebird 400, 068 cam, TH400 & 13" Continental Converter, Auburn posi with 3:08 factory gears, Cliff's Q-jet resting on a 68 factory iron intake, GM HEI and Ram Air pans and RARE Long Branch Manifolds |
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#2
03-20-2026, 07:59 PM
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the 1361577 is a Buick #
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The difference between inlaws and outlaws? Outlaws are wanted |
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#3
03-21-2026, 08:03 AM
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I used to toss em since they were big and heavy.
Now those are kinda neat, and desired. |
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#4
03-21-2026, 08:24 AM
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Modulators
Yeah they are garage art. Just wondering what applications were.
Tested and all hold vacuum. Just one seems to take more to activate And when dumping vacuum. It really thuds back to rest position. Gerry
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1968 Firebird 400, 068 cam, TH400 & 13" Continental Converter, Auburn posi with 3:08 factory gears, Cliff's Q-jet resting on a 68 factory iron intake, GM HEI and Ram Air pans and RARE Long Branch Manifolds |
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#5
03-22-2026, 05:45 PM
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Guys who are doing a correct resto will pay good $ for them
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The difference between inlaws and outlaws? Outlaws are wanted |
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#6
03-24-2026, 01:17 AM
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The adjustment screw is probably spot-welded in position. Break the spot-weld, and they become adjustable. Unlike the cheap, little aftermarket units, the big black cans are altitude-compensated.
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#7
03-24-2026, 02:00 AM
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Are the NOS Borg Warner (VM400) units any good? They look identical to the original GM part.
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I'm World's Best Hyperbolist !! |
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#8
03-24-2026, 06:04 PM
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Quote:
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