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49 F1 Differential tag decode.

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Old May 1, 2020 | 02:02 PM
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49 F1 Differential tag decode.
Can anyone help me in decoding this diff tag on my 49F1 thanks.

Mounted to rear diff cover bolt.

 
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Old May 1, 2020 | 03:20 PM
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Tag says you got a 3.72 gear ratio, F1 had a Spicer / Dana 44 axle
 
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Old May 1, 2020 | 04:24 PM
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41 teeth on the ring gear, 11 on the pinion. 41 divided by 11 = 3.73 gear ratio. (3.727272...)
 
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Old May 1, 2020 | 04:26 PM
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Thanks guys. That’s a great help. I’m learning something new every day. Makes sense how they tag it really. Just wasn’t aware.
 
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Old May 2, 2020 | 04:24 PM
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Check the bottom right web from the back. It should have a 41 cast on the web. Early F1s used Dana/Spicer 41. 44s came later and internal parts don't interchange.
 
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Old May 2, 2020 | 06:45 PM
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Originally Posted by mtflat
Check the bottom right web from the back. It should have a 41 cast on the web. Early F1s used Dana/Spicer 41. 44s came later and internal parts don't interchange.

I’ll certainly check that out. Thanks for the info.
 
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Old May 4, 2020 | 06:10 PM
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Originally Posted by iburman
I’ll certainly check that out. Thanks for the info.

I got to check it today and it does say 41 on the web. Thanks for the direction.

 
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Old May 4, 2020 | 09:13 PM
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You're welcome - we're all happy to help! It's those little things that make the hobby interesting. And somebody pointed that out to me years ago.
My 48 has the same housing with 4.27 ratio. I swapped it out for a 9" with 3.50 gears for highway speeds.
 
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