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07-20-2019, 09:53 PM | #21 |
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Join Date: Jul 2012
Location: Australia/USA/EU/Soviet Russia
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Re: changing to 5.50 Bias Ply = changing to 3.54 ratio
[QUOTE=Synchro909;1779088]The restorer of my '28 Tudor fitted a 3.54 diff. A later owner fitted a 26% Mitchell O/D. I am going back to reduce the overall ratio because it is too highly geared as it is in O/D. Economy is poor and it hates hills. This is the same as you experienced.
By going back to 3.78, I am reducing the overall ratio by about 3.6%. By putting 5.00X19 wheels and tyres on it, I'm dropping by 3% - about the same. I have the wheels ready to go (the old 21" tyres are worn out) so I will try that option first ($$$).Before anyone criticises me for putting 19" wheels on a '28 car, this car is a go-er, not a show-er![/QUOTE You've probably considered it I'm sure but another option could be going to 4.11 then adding BF GOODRICH 550x19 bias ply which effectively gives you approx. 3.9 (a guess without doing the maths). If I had a mitchell I would want it to pull most hills in o/d. Better to be geared a bit low than a bit high.
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07-21-2019, 10:53 PM | #22 |
Senior Member
Join Date: Jul 2012
Location: Australia/USA/EU/Soviet Russia
Posts: 1,105
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Re: changing to 5.50 Bias Ply = changing to 3.54 ratio
Coker has a $60 rebate deal currently on a set of 4 tyres, see:
https://www.cokertire.com/media/adsp...own_form_2.pdf
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