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Thread: 200r4 governor modification to raise shift points

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    VCVC Member jrinaman's Avatar
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    200r4 governor modification to raise shift points

    the 200r4 was designed for engines of the same era, not our vans. they allow us to run lower gears and still have reasonable cruising rpm's. g.m. didn't do that though, they kept the highway gears and designed the engines to run at low rpm's. our vans, especially the sixes are meant to run at a higher rpm. my c40 turned 5500 for hours on end and never broke the speed limit, mileage was about the same as my much lighter van running 2300 @ 70 miles an hour. while our little sixes do fine cruising at light throttle at 2k, they need to rev a bit more to get there. hacking some weight of the governor 'should' allow it to spin a little higher at part throttle and still settle in as you lighten your foot. this is the very first part to order:
    Attached Thumbnails Attached Thumbnails 20190514_182705.jpg  
    '64 chevy, 292 40 over, 206/526 cam, 2004r trans. 9.75:1, dual webbers, Langdon cast headers, 1.94 valves

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    VCVC Member jrinaman's Avatar
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    getting it right may require removing the pan and grinding off more so just spend the 6 bucks on the drain plug. the governor is at the rear under this cover:
    Attached Thumbnails Attached Thumbnails 20190514_190042.jpg   20190514_190343.jpg  
    '64 chevy, 292 40 over, 206/526 cam, 2004r trans. 9.75:1, dual webbers, Langdon cast headers, 1.94 valves

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    VCVC Member jrinaman's Avatar
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    I took it apart and went at it with a die grinder. articles I read showed more than this hacked away but it is easier to take more off than to add it back on.
    Attached Thumbnails Attached Thumbnails 20190514_190435.jpg   20190514_190450.jpg   20190514_190629.jpg  
    '64 chevy, 292 40 over, 206/526 cam, 2004r trans. 9.75:1, dual webbers, Langdon cast headers, 1.94 valves

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    VCVC Member jrinaman's Avatar
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    after a few minutes of hacking and butchering
    Attached Thumbnails Attached Thumbnails 20190514_195115.jpg   20190514_202533.jpg   20190514_202539.jpg   20190514_202545.jpg  
    '64 chevy, 292 40 over, 206/526 cam, 2004r trans. 9.75:1, dual webbers, Langdon cast headers, 1.94 valves

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    VCVC Member jrinaman's Avatar
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    finally took it for a test drive. wow, what an improvement! light throttle is just enough to notice a difference, normal driving and it revs to 2 grand before shifting where it used to shift below 1500. half throttle and it revs to 3 grand and grabs another gear right in the power band. floored it going up a hill and it dropped to second @ 4000 and held to 5000 before I let off. it quickly went to forth @ 2200 and i didn't want to push it too much on a 45 mph windy road. I was at 75 mph in second gear! NEVER climbed that hill like that before. I usually lugged up the hill at 1600 rpm and full throttle would rev to 2600 then shift and drop to 1700, shifting back and forth the whole time so it was easier to just chug up the hill at 1600. with no aftermarket governors available, the options are grinding as did or finding a monti carlo governor @ $150.00 for a used one!! the buick grand national is the one you want but good luck finding that! this mod is far from a performance build, it simply raises the shift points.
    '64 chevy, 292 40 over, 206/526 cam, 2004r trans. 9.75:1, dual webbers, Langdon cast headers, 1.94 valves

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