I dont Understand
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Junior User
Joined: Jun 2011
Posts: 73
Likes: 0
From: Northern Kentucky
I dont Understand
Hi all,
Could someone please explain the whole transmision gear ratio thing to me. Transmissions aren't really in my line of sight, and other then removing and installing, i dont understand em much. I have a 223 in my truck, and the transmission is stock, the original one, so what gear ratio is that?
thanks
Could someone please explain the whole transmision gear ratio thing to me. Transmissions aren't really in my line of sight, and other then removing and installing, i dont understand em much. I have a 223 in my truck, and the transmission is stock, the original one, so what gear ratio is that?
thanks
Logistics Pro
Joined: Jun 2010
Posts: 4,963
Likes: 261
From: East KY
What year truck you talking about? 3-speed, 4-speed? Etc. We need more info.
BUT, in the meantime, go out to your truck and look at the back cover plate on the rear end housing. See if there is a metal tag sticking out from underneath one of the bolts. If so, give us the 2 numbers that are stamped on it. Divide the small number into the larger number.
Where are you in KY by the way?
BUT, in the meantime, go out to your truck and look at the back cover plate on the rear end housing. See if there is a metal tag sticking out from underneath one of the bolts. If so, give us the 2 numbers that are stamped on it. Divide the small number into the larger number.
Where are you in KY by the way?
Lead Driver
Joined: Oct 1999
Posts: 6,774
Likes: 552
From: Kalispell, MT
Unless it is an over-driven (OD) trans the final gear ratio is the only one that matters. They're all 1:1 final drive - meaning the drive shaft turns the same rpms as the crankshaft of the engine.
The gears just break that down to get you started depending on the application. A light vehicle doesn't require as low a gear (higher ratio) as a heavy vehicle to start out.
For example: if a trans has a 3.62 first gear, the engine is making 3.62 revolutions for 1 turn of the driveshaft.
A heavy truck might need a 4.35 first gear, but that little half-ton can get by with 2.95 ratio to get moving.
Confused yet? Second gear would be somewhere between first gear ratio and the 1:1 final drive.
The gears just break that down to get you started depending on the application. A light vehicle doesn't require as low a gear (higher ratio) as a heavy vehicle to start out.
For example: if a trans has a 3.62 first gear, the engine is making 3.62 revolutions for 1 turn of the driveshaft.
A heavy truck might need a 4.35 first gear, but that little half-ton can get by with 2.95 ratio to get moving.
Confused yet? Second gear would be somewhere between first gear ratio and the 1:1 final drive.
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