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2.50:1 or 2.47:1 nine inch gears needed

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240SIX
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2.50:1 or 2.47:1 nine inch gears needed

Post #1 by 240SIX » Mon Jul 01, 2019 2:53 pm

Where can i get a dropout with 2.50:1 ratio? The lincolns and thunderbirds and cougars came with them factory in mid seventies but nobody caters to anything taller than 3.00:1 aftermarket. Need to get a decent used pig with 31 spline side gears and either 2.50:1 or 2.47:1 for my 4BT Cummins and T19 combo... if anyone can point me in the right direction without trying to change my mind or push me to using the newer junk Overdrives i would appreciate it. Thanks.

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xctasy
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Re: 2.50:1 or 2.47:1 nine inch gears needed

Post #2 by xctasy » Tue Jul 02, 2019 1:51 am

The 2.47 was reused in the Sterling 8.7 inch axle used in the 250 and 255 Granada/Monarchs. It has a D0 part number; ie ex 9 or F100 or Big Econoline.I'm certain that ring and pinion swaps over into the 9" case.

Search xctasy 8.7" axle and you"ll see photos in the running gear section.

The 8.7 repurposed 9" third member parts in a Salisbury case, a forerunner to the 2.47 8.8" Sterling axle.

Lassiter on this forum got his 8.8 fitted with a 2.47.
Last edited by xctasy on Mon Jul 08, 2019 6:13 am, edited 1 time in total.
Image
XEC Ltd ICBE's Inter Continental Ballistic Engines-
FAZER 6Bi (M112 & EEC5) or FAZER 6Ti (GT3582 & EEC5) 425 HP 4.1L/250 I-6
FAZER 6V0 3x2-BBL Holley 188 HP 3.3L/200 I-6 or 235 HP 4.1L/250 I-6
X-Flow Engine Components Ltd http://www.xecltd.info/?rd=10

240SIX
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Re: 2.50:1 or 2.47:1 nine inch gears needed

Post #3 by 240SIX » Tue Jul 02, 2019 3:04 am

Well from what little I gathered from that is they are 28 spline which will not work with my axles even if the gears could be modified to fit, the non dropout axle or “WER” rear axle we used to call them have almost nothing in common with a nine inch other than it came in a Ford car. They are the C-clip retained 28 spline predecessors to the 7.5 and 8.8 of today. What i am looking for is what would have originality came underneath a 1975-1979 Big car like Thunderbird or Cougar with 9” 31 spline dropout style axle. The tallest available (i have some) for a pickup in 1981 was 2.75:1 but a few of the 400 cubic inch cars had the 2.50:1 and 2.47:1 at the beginning of the gas crunch before the cars shrunk.

My problem is where to find them, most wrecking yards have scraped all these and aftermarket doesn’t support anything numerically lower (taller) gears than 3.0’s. What do people do who need to replace their factory stuff? And again where would i find a good source of good used of one of these? All the yards in my area that i know of don’t save any vehicles in their yard older than ten years of age (which i think is stupid, a ten year old car shouldn’t need parts).

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xctasy
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Re: 2.50:1 or 2.47:1 nine inch gears needed

Post #4 by xctasy » Tue Jul 02, 2019 3:21 am

See https://www.fordsix.com/viewtopic.php?f=76&t=74435

There are Dana 44 and 50 axles with 2.32 axle ratios.

You contact the following website and start firing off a salvo of questions.

The fact that Aussies and Kiwis help you guys means that you haven't thumped the table enough dude.
Image
XEC Ltd ICBE's Inter Continental Ballistic Engines-
FAZER 6Bi (M112 & EEC5) or FAZER 6Ti (GT3582 & EEC5) 425 HP 4.1L/250 I-6
FAZER 6V0 3x2-BBL Holley 188 HP 3.3L/200 I-6 or 235 HP 4.1L/250 I-6
X-Flow Engine Components Ltd http://www.xecltd.info/?rd=10

240SIX
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Re: 2.50:1 or 2.47:1 nine inch gears needed

Post #5 by 240SIX » Tue Jul 02, 2019 3:32 am

I believe my only question above is:

“Where can i get a dropout with 2.50:1 ratio?“

I didn’t say anything derogatory about Australia, or to you and i thank you for your input but i am not looking to change my entire axle assembly, only the dropout section of it.

I feel you missuderstand what i was attempting to confer. I gave as much extra information as I could so others would know what and why but I guess it was my fault. I should have been completely vauge.

No hard feelings my friend, and for the record i love Australia and Kiwi’s

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Re: 2.50:1 or 2.47:1 nine inch gears needed

Post #6 by xctasy » Tue Jul 02, 2019 3:39 am

Good fortune my friend. Its got nothing to do about nationality, its about you getting what you need. :beer: :nod:

See wally the shark's post; the guy from Renton sells ring and pininons, and a guy from the United Kingdom found it.

https://fordsix.com/viewtopic.php?f=76& ... 55#p606955


Dont make me come over and show you....Washington is where its at!
Image
XEC Ltd ICBE's Inter Continental Ballistic Engines-
FAZER 6Bi (M112 & EEC5) or FAZER 6Ti (GT3582 & EEC5) 425 HP 4.1L/250 I-6
FAZER 6V0 3x2-BBL Holley 188 HP 3.3L/200 I-6 or 235 HP 4.1L/250 I-6
X-Flow Engine Components Ltd http://www.xecltd.info/?rd=10

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Re: 2.50:1 or 2.47:1 nine inch gears needed

Post #7 by mustang6 » Wed Jul 03, 2019 7:16 pm

You are right that the 70s-'80s large cars used to have them, most every Lincoln Versailles 9' disc brake rear I ever saw for sale had 2.5:1 or 2.75:1 gears. I'm sure most people pulled the gears out when converting them for older cars, a hot conversion back in the day. I think I still have a 2.75:1 9" 3rd member over in my dad's shop, but I'm not sure what spline it is. I can check this weekend but I'm guessing it would be 28 spline since the ones on ebay (see below) are advertised as such.

https://www.ebay.com/i/382866289452?rt=nc&_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D20160908110712%26meid%3D640641ff45204905b5a19d7fd8822851%26pid%3D100677%26rk%3D3%26rkt%3D4%26sd%3D253954225567%26itm%3D382866289452

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Last edited by mustang6 on Wed Jul 03, 2019 7:49 pm, edited 1 time in total.
Scott

68 Mustang 200 ci, Aussie 250-2V head, Dual Headers, Comp Cams 252H, DSII w/MSD 6AL, T-5, V8 suspension.

65 Ranchero 200 ci, late 170 head, Autolite 1101, 3.03 3 speed, Maverick 8" 4 lug rear with 3.55 gears.

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Re: 2.50:1 or 2.47:1 nine inch gears needed

Post #8 by mustang6 » Wed Jul 03, 2019 7:48 pm

I think I might have a lead for you- I had a great experience a number of years ago with a guy that put together a custom 9" combo for me- he has many new and used third members and could probably put a 2.50:1 31 spline together for you.

His name is Alan, his number is 609-420-7113. He was recommended to me by someone in my local Mustang Club, and I would recommend him also based on my experience.
Scott

68 Mustang 200 ci, Aussie 250-2V head, Dual Headers, Comp Cams 252H, DSII w/MSD 6AL, T-5, V8 suspension.

65 Ranchero 200 ci, late 170 head, Autolite 1101, 3.03 3 speed, Maverick 8" 4 lug rear with 3.55 gears.

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xctasy
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Re: 2.50:1 or 2.47:1 nine inch gears needed

Post #9 by xctasy » Mon Jul 08, 2019 4:15 am

Lassiter stated that the 1983 Bronco was the first 8.8 inch axle with 2.47.

viewtopic.php?f=2&t=65424&p=607781#p607781

By 1986 it had become the base model 5 speed axle option for Big Sixes.


Going backwards in the last of the 9 inch trucks, the 351 M or 400 Ford Bronco 2nd generation, or 1980/81 351 M or 1982/83 351 W 3 rd generation Bronco should have either the 9 or 9-3/4 31 spline 3rd member. Based on that, the ratio is the origin of the 2.47 in truks, I think.

The 250 in 1970 Grande Mustangs had a 9" 2.47 ratio as well. It may have had a special 2.33 8" ratio the year before. That D0 code 2.47 ring and pinion again, its listed here.

http://monarch76.proboards.com/thread/2 ... des-ratios

http://www.landracing.com/forum/index.php?topic=13504.0

Codes are 7 or 17 but that is depending on rated payload, not GCVW.

The pre 1978's had a code 18 2.50 9 inch in 2900 payload Broncos, F100s and 350s.

Look at the last pre 1978 chart.

https://www.blueovaltrucks.com/tech-art ... r-sticker/

Good fortune.
Image
XEC Ltd ICBE's Inter Continental Ballistic Engines-
FAZER 6Bi (M112 & EEC5) or FAZER 6Ti (GT3582 & EEC5) 425 HP 4.1L/250 I-6
FAZER 6V0 3x2-BBL Holley 188 HP 3.3L/200 I-6 or 235 HP 4.1L/250 I-6
X-Flow Engine Components Ltd http://www.xecltd.info/?rd=10

240SIX
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Re: 2.50:1 or 2.47:1 nine inch gears needed

Post #10 by 240SIX » Wed Aug 28, 2019 9:06 pm

Thank you Scott for the lead! I spoke with him briefly today and he sounded purdy sure he could set me up with some 2.50’s and buld a chunk to my needs. Thanks a bunch! Funny how years ago when boiling tires was important before the onset of smaller Diesel engines in pickup trucks we used to throw away “tall” gears... my how things have changed!

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