| 35gal | -- 07-18-2010 @ 6:20 PM |
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I have a set of reproduction high speed gears (3:54 to 1) and the number of teeth on them is different than the original high speed gears. The reproduction gears have 32-9 teeth and according to my book the original gears have 39-11 teeth. It's the same ratio but will the different teeth effect performance in anyway.
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| Cecil/WV | -- 07-18-2010 @ 7:20 PM |
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If the final ratio is the same, why would it make any difference? Sounds good to me, although there is a fractional difference, but no enough to notice. Shiny side up! Cecil/WV This message was edited by Cecil/WV on 7-18-10 @ 7:22 PM
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| 37RAGTOPMAN | -- 07-19-2010 @ 6:30 AM |
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not seeing the size of the 9 tooth pinion,I would think smaller and weaker then the 11 tooth pinion, were did you buy the 354-1 ratio I installed the 11 tooth, one in my 37, and am using MOBILE 1 GEAR OIL IN IT, 37RAGTOPMAN KEEP ON TRUCKIN....!!!!!!!!
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| supereal | -- 07-19-2010 @ 7:47 AM |
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The strength of the gear set is mostly determined by the quality of the material and the machining. The main effect of a coarser mesh is noise.
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| 35gal | -- 07-19-2010 @ 2:04 PM |
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Super, do you think there will be that much difference between the two in noise.
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| Stroker | -- 07-19-2010 @ 3:12 PM |
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Me-Thinks that the repop gears have fewer teeth in order to save production costs. Generating (hobbing)spiral-bevel teeth is a time-consuming, (read "expensive") process. The problem with fewer teeth may not be just a greater possibility of noise, but also the fact that the individual gear loading may be greater, as fewer teeth are in mesh at any given moment. Having said that; Original Ford 4:11 gearsets had an 37-9 combination. Given that the input torque should be similar, unless you are running a highly-modified engine, then obviously a 9-tooth pinion should never be a problem. Noise will be a function on how carefully the ring and pinion have been machined, as well as how well the rear end is set up during assembly.
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| supereal | -- 07-20-2010 @ 10:10 AM |
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I think my friend Dan has covered the answer. Most rear ends produce some noise, regardless of how carefully they are set up, depending upon the number and pitch of the teeth. You can bet that if reducing the number of teeth didn't matter, old Henry would have done it to save a few bucks.
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| 35gal | -- 08-09-2010 @ 9:44 AM |
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37RAGTOPMAN, where did you find the 11 tooth pinion gears. Everyone I've called has the 9 tooth.
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| MOXIE | -- 08-09-2010 @ 4:31 PM |
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Maybe joblot has the 11 tooth.
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