Watson 2021
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Cargo Master
Joined: Aug 2015
Posts: 2,072
Likes: 100
From: Marana, Arizona
Watson 2021
A buddy of mine has an overdrive he pulled from a half ton Chevy. I think it would work on my F3 project. I find very little online about it. Anybody run one? H.S. Watson Model 2021.
It seems three companies eventually became Spicer and this does say Spicer on the tag as well. It looks like it can be mounted as under or overdrive. It is cable actuated. Looks doable.
It seems three companies eventually became Spicer and this does say Spicer on the tag as well. It looks like it can be mounted as under or overdrive. It is cable actuated. Looks doable.
More Turbo
Joined: Feb 2010
Posts: 661
Likes: 6
From: parma
Does it have u-joint yokes on it? Or did the chevy have a torque tube? Those units usually don't have seals on the ends, so the yokes have turns that look like threads on the inside. These threads are used to force the gear lube back in side the case. Sooooo, if you turn the unit the wrong way, everyone will know where your going, plus you'll run it out of lube. In the long run, its either an overdrive or an underdrive. Unless it's a 3 speed. Then you might have both ratio's.
Then comes the other problem. If it is overdrive, how much is too much overdrive before the engine runs out of air?
Then comes the other problem. If it is overdrive, how much is too much overdrive before the engine runs out of air?
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Cargo Master
Joined: Aug 2015
Posts: 2,072
Likes: 100
From: Marana, Arizona
It's got u-joints on both sides. The little info I found shows either .72 or .75 overdrive. Saw one reference that it was 70's or 80's Chevy trucks? Had Morse marine cable actuation. Looks like I could even rig lever if I wanted to.
It's just a small gearbox with gear lube in it. Mount it one way it's OD. Flip it around and its underdrive. Looks like it would work. I have a two piece drive line with a carrier bearing on the cross member. Put it there. Now that I'm all fired up about it my buddy is having second thoughts of getting rid of it. If I use it I will post up pics.
One thing that would be an issue is speedometer. It's not accurate with my gear swap and tire change anyway.
It's just a small gearbox with gear lube in it. Mount it one way it's OD. Flip it around and its underdrive. Looks like it would work. I have a two piece drive line with a carrier bearing on the cross member. Put it there. Now that I'm all fired up about it my buddy is having second thoughts of getting rid of it. If I use it I will post up pics.
One thing that would be an issue is speedometer. It's not accurate with my gear swap and tire change anyway.
Cargo Master
Joined: Aug 2014
Posts: 2,594
Likes: 72
From: North Central Arkansas
I have .72 OD in the Brownie I installed in my F4. I believe that Watson unit would work really good in your truck. Install it just forward of where the carrier bearing is now, with the rear yoke in the correct place to use your rear driveshaft as is. Then you might be able to install it with only modifying the front driveshaft. Maybe you could shift it with a solenoid and control it with a two speed axle switch on the stick.
Mark
Mark
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Joined: Aug 2003
Posts: 3,222
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From: Houston
Quote: "One thing that would be an issue is speedometer. It's not accurate with my gear swap and tire change anyway."
You could always get a Speed Hut GPS speedometer. I have one in my '52 and it works great with a small antenna that sits on the dash (magnet). https://www.speedhut.com/gauges/
You could always get a Speed Hut GPS speedometer. I have one in my '52 and it works great with a small antenna that sits on the dash (magnet). https://www.speedhut.com/gauges/
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Cargo Master
Joined: Aug 2015
Posts: 2,072
Likes: 100
From: Marana, Arizona
Sorry for the late reply fellas. My world is coming down on me a bit right now. I'll get back to this eventually.
Mark, thanks for the confirmation and the solenoid idea. I always like your ideas and the work you do.
topmoo, thanks for that link. I never knew of that company.
This forum ROCKS! A lot of talent and great folks willing to share their knowledge here.
Mark, thanks for the confirmation and the solenoid idea. I always like your ideas and the work you do.
topmoo, thanks for that link. I never knew of that company.
This forum ROCKS! A lot of talent and great folks willing to share their knowledge here.
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