Re: Ring & Pinion Interchangeability
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Home away from home
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Perhaps one of the savvier souls here gathered can confirm,
but a 3.9:1 rear cog out of a junior bathtub delivered without overdrive or '51-'52 Ultramatic 200 might fit. If you're going to change rear gearing, go to the tallest you can find, because Packards are laughably undergeared.
Posted on: 2013/2/21 15:20
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Re: Ring & Pinion Interchangeability
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Forum Ambassador
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Packards are laughably undergeared.
Yes - for today's roads and driving habits but not for their era and prevailing conditions of the time. Their ratios were pretty much the same as the other heavy cars of the time, and some of the others had even higher ratios. PS - I just looked up some just-prewar axle ratios for some of the heavier Chrysler, Buick and Cadillac chassis - several models of each were between 4.5 and 4.6 to 1 so Packard wasn't really out of step for the times. Jampard - have you checked a Hollander's for interchange information?
Posted on: 2013/2/21 18:22
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Re: Ring & Pinion Interchangeability
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Home away from home
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Check the parts book on this site and you can easily find out what other years will fit your car.
Posted on: 2013/2/21 20:25
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Re: Ring & Pinion Interchangeability
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Home away from home
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The parts book takes quite a bit of searching, but here is a basic summary of units that have a ring & pinion which should fit the 1938 carrier:
1937 - 39 Six & 120 1940-42 Most models except 6 cylinder 1941 Clipper 1942-47 Super & Custom Super Clipper 1948 - 50 Custom 8 In most cases the entire carrier assembly should bolt in except for the 1937 models which still used the angled housing 1942 - 47 Junior Clippers are different as are 1948 - 50 Standard & Super 8 models
Posted on: 2013/2/21 22:13
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Re: Ring & Pinion Interchangeability
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Not too shy to talk
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Thank you very much for this information that you dug up. This will be very helpful in our search.
I started looking in the '35 - '41 Packard Parts Manual and found quite a few model numbers that had the same Ring & Pinion part number. I'm trying to convert all the different model numbers to model names. The '38 Six 4.54:1 Ring & Pinion part number is supposed to be 900066. These are the model numbers I found that have the same Ring & Pinion part no.: 115C, 120C, 120CD, 120CA, 138CD, 120B, 120BA, 120, 1600, 1601-1D, 1700, 1701, 1703, 1705, 1801-T1900-1901, 1801-1901, 1803A-1903A, 1805-8-1905-8. Now, all I have to do is find a NOS set, or a set in very good condition. I'm looking for maybe a 3.54:1 ratio.
Posted on: 2013/2/28 20:12
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Re: Ring & Pinion Interchangeability
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Forum Ambassador
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The lowest Packard offered was 3.92:1. I have a used ring/pinion in this ratio if you desire, $450. The only lower option is a newly produced 3.54 set that is advertised. Packard never made this.
Posted on: 2013/2/28 23:29
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Re: Ring & Pinion Interchangeability
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Home away from home
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Buy Flackmaster's 3.92 pumpkin AND retrofit overdrive. Then you'll have a wonderful road car. Any competent shop can cut down your existing driveshaft and balance it, or get the right driveshaft out of a '39-'41 Six, or '42 110 conv. parts car, as these all share your 122-inch wb, that came with overdrive. It's hard to overgear a Packard, and your 245-ci six was spunky enough to be offered as a marine engine in 1950, and in White Trucks in the '50s.
Didn't realize the 3.92:1 from senior cars would fit, which is why i suggested earlier the 3.9:1 differential from a junior tub, or 1951-52 200 w/ Ultramatic. The above poster's right. No junior Packard came with a 3.54. A 3.9/3.92 if it fits will still leave you with enough snap around town, while giving you long legs for relaxed cruising in overdrive. A 3.54 might be a little tall, strain your pressure plate, but i defer to others' experience. I know a fellow who so geared (3.54) a junior '47 Clipper 8 club sedan with overdrive, but said it was too tall, no power on the freeway, and so went with a 3.9. Any Packard can benefit from more relaxed, taller gearing, being wonderful, torquey cars.
Posted on: 2013/3/1 18:11
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