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06-05-2020, 04:59 AM | #1 |
Senior Member
Join Date: Jul 2010
Location: Cairns , Australia
Posts: 739
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Best rear axle ratio?
Guys a buddy of mine has a newly purchased 36 coupe. It’s running a warm 24 stud flatty, he hasn’t driven it enough yet to know how much power the motor has. Anyway he needs to purchase a new crown wheel and pinion. He has bought 750-16 tyres. Standard 39 transmission. He lives in the country so wants a high ratio, just doesn’t know whether to go with 3.54 or 3.2. With his 750 tyres what recommendation ratio should he aim for? Not sure if he has a 9” or 10” clutch.
Thanks in advance Dan. |
06-05-2020, 06:50 AM | #2 |
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Join Date: May 2010
Location: tasmania
Posts: 221
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Re: Best rear axle ratio?
dan with those tires 4.11 would be the go
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06-05-2020, 07:31 AM | #3 |
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Join Date: May 2010
Posts: 499
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Re: Best rear axle ratio?
If your choice is 3.54 or 3.2, go with 3.54 as the larger than stock tire size reduces the ratio below 3.54 and 3.2 with 600 x 16 tires is not great in hilly conditions.
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06-05-2020, 08:12 AM | #4 |
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Join Date: Sep 2016
Location: sydney australia
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Re: Best rear axle ratio?
im running 354s on 600/16s and cant complain about the speed but can be difficult on hill starts as tends to get minor clutch shudder
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06-05-2020, 09:51 AM | #5 |
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Join Date: Mar 2014
Location: Jacksonville FL
Posts: 3,925
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Re: Best rear axle ratio?
We are running a 3:54 in our 32 with the stock 18" rims and tires, on flat land its wonderful, hills...not too bad, mountain's have to be climbed in first gear!!! OH, and "stock" 32 Flathead with stock 32 transmission.
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06-05-2020, 09:56 AM | #6 |
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Location: Solihull, England.
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Re: Best rear axle ratio?
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Mart. |
06-05-2020, 10:12 PM | #7 |
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Join Date: May 2010
Location: Near Rising Sun, Maryland
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Re: Best rear axle ratio?
Last summer I rebuilt the banjo rear in my '35 fordor sedan, and installed a 3.54:1, six spline pinion gear set. I also rebuilt the original #48-7006 transmission case using the later style '46-'48 side shift trans gear set with 29 tooth cluster and 15 tooth input gear. This transmission & rear gear combination using 6:00 x 16 tires works perfectly when starting off in 1st gear, on flat, or hilly ground, and climbs hills and mountain roads well in 3rd gear. The engine is a '35 babbitted main bearing, 21 stud, 221 cu in, 85 hp, bored 0.030" over, plus both the deck and heads have been milled for higher compression. This little engine runs amazingly well.
__________________
John "Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein Last edited by JM 35 Sedan; 06-05-2020 at 10:46 PM. |
06-06-2020, 05:55 AM | #8 |
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Join Date: Jul 2010
Location: Cairns , Australia
Posts: 739
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Re: Best rear axle ratio?
Thanks John. My buddy has already decided on a 3.54 ratio based on the above comments. Thanks to all who responded.
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06-06-2020, 06:06 AM | #9 | |
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Location: NJ
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Re: Best rear axle ratio?
Quote:
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06-06-2020, 06:19 AM | #10 |
Senior Member
Join Date: Jul 2010
Location: Cairns , Australia
Posts: 739
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Re: Best rear axle ratio?
I actually have a beautiful original 3.54 in my roadster but that’s being removed to fit a Columbia axle.
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