2.40-something pumpkin for 8-3/4 rear
#2085668
06/04/16 01:00 AM
06/04/16 01:00 AM
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Joined: Mar 2004
Posts: 432 Fort Lee, VA
BattleCruiser71
OP
mopar
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OP
mopar
Joined: Mar 2004
Posts: 432
Fort Lee, VA
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Does anyone know what years they made such a thing? I've heard tell of "turnpike cruiser" options that had them. Prepping for massive road trip in a 70 Newport with either a 2.76 or 2.94 or thereabouts but have a notion that some 2.45-ish gears would be my cheapest overdrive-ish option. Anyone in Maryland/Virginia have a small yoke set they'd part with?
Ole' Ugly, my 1985 Gran Fury. Luke, my 39,000 mile 77 New Yorker, Darth, my 50,000 mile 60 New Yorker.
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: BattleCruiser71]
#2085730
06/04/16 07:05 AM
06/04/16 07:05 AM
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Joined: Dec 2014
Posts: 5,895 ohio
ruderunner
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master
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ohio
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They had ratios like that for the 8.25 and or the 9.25. But iirc 2.76 is the lowest for the 8.75
Maybe a taller rear tire?
Angry white pureblood male
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: Kern Dog]
#2086036
06/04/16 08:33 PM
06/04/16 08:33 PM
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Joined: Jan 2008
Posts: 3,886 Lost and Spaced
bboogieart
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master
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Lost and Spaced
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The cheapest thing I can think of is tall tires. 235 75 15 is 29"x9". They do fit. If your already there then your ready to go...
I have mechanical Aptitude. I can screw up anything.
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: Kern Dog]
#2086286
06/05/16 11:48 AM
06/05/16 11:48 AM
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Joined: Dec 2003
Posts: 22,696 Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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The pinion gear gets larger as the number gets smaller. A 4.10 pinion is smaller than a 2,.76. The 8.75 housing is tight with a 2.76 and because of that, no other pinions taller than 2.76 will fit. I thought there was a lower ratio offered, rare, but a gas crisis/mileage brute force OEM solution. I might have been confused with the as already mentioned, the other rears. But if one was willing to even slightly reduce the effective ring diameter, and still use the same 8.75 carrier, keep the same max pinion diameter, move the new pinion teeth slightly rearward, lower ratios could be found. I don't think it would take much diameter reduction to get to 2.40. In my eyes it was possible. Just thinking out loud.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: BattleCruiser71]
#2086330
06/05/16 12:48 PM
06/05/16 12:48 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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About to go away
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up yours
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8 3/4 was pretty much out of production by the time the first gas crunch hit. 1974 was the year and the only pass car with an 8 3/4 was the E bodies, IIRC. Dunno about truck applications.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: BattleCruiser71]
#2086387
06/05/16 01:48 PM
06/05/16 01:48 PM
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Joined: Jan 2003
Posts: 20,188 Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
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Park Forest, IL
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8-1/4 came as low as 2.29 IIRC. That was part of the reason they went to low gear sets in the trans.
"Everybody funny, now you funny too."
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: slantzilla]
#2086407
06/05/16 02:12 PM
06/05/16 02:12 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Lincoln Nebraska
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I coulda swore I heard of a 2:45 available but it might have been for the 8&1/4
live every 24 hour block of time like it's your last day on earth
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: RapidRobert]
#2087069
06/06/16 03:00 PM
06/06/16 03:00 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
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Highway gears....Nothing lower numerically than 2.76 for the 8 3/4.
I own a brand new OEM 2.94 set for the 489 case. They were going to go behind my stroker that never got built.
R.
Last edited by dogdays; 06/06/16 03:00 PM.
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: dogdays]
#2087358
06/06/16 10:18 PM
06/06/16 10:18 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Lincoln Nebraska
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No 2:45. Noted. EDIT on the other end I do have a set of 5.57's all ready and I have a 6 something R&P on the shelf (dont remember if they are 6:14's or 6:20 (8&3/4)
Last edited by RapidRobert; 06/07/16 12:45 AM. Reason: bored
live every 24 hour block of time like it's your last day on earth
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: RapidRobert]
#2087716
06/07/16 01:36 PM
06/07/16 01:36 PM
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Joined: Dec 2005
Posts: 1,159 Cruising!
QuickDodge
super stock
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super stock
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Cruising!
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RapidRobert, I'm almost positive they made some 2.45 gears in the 9 1/4 axle. It seems like a set of those were in a rusty Cordoba I parted out decades back. I had an M body Grand Fury with the 2.2? gears in an 8 1/4 axle. It was a slug, so those were swapped for some 2.94 cogs!
Last edited by QuickDodge; 06/07/16 01:38 PM.
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: QuickDodge]
#2087793
06/07/16 04:00 PM
06/07/16 04:00 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Lincoln Nebraska
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Yeah I remember the 2:45 listed I just dont remember exactly what axle. that 2.2 was that for 70's EPA? mileage numbers!
live every 24 hour block of time like it's your last day on earth
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: BattleCruiser71]
#2087893
06/07/16 07:19 PM
06/07/16 07:19 PM
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Joined: Apr 2007
Posts: 2,921 Calgary, Alberta Canada
a12rag
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Calgary, Alberta Canada
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2.45 were in the 8 1/4. I took the complete rear end out of a gold duster, way back in 1998, put it into my Duster360 that year and drove to Carlisle. Cruising at 70mph with 235/60/14 tires, 2.45 gears, the 360 was ticking over at 2650(ish) RPM. 22 mpg all day long, and the 360 torque, could always roast the right tire ! Have left that rear end in my Duster360 ever since ! . . . lowest numerical gear I have heard of for 8 3/4 is the 2.76 gear set. . . . good luck with your search . . .
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: a12rag]
#2087920
06/07/16 07:55 PM
06/07/16 07:55 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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About to go away
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up yours
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2.45 were in the 8 1/4. I took the complete rear end out of a gold duster, way back in 1998, put it into my Duster360 that year and drove to Carlisle. Cruising at 70mph with 235/60/14 tires, 2.45 gears, the 360 was ticking over at 2650(ish) RPM. 22 mpg all day long, and the 360 torque, could always roast the right tire ! That same combo in front of a 225 is horrible. Made that mistake when I upgraded by 72 Swinger to later discs and an 8 1/4. Looked at everything on the 8 1/4, except the ratio, before I pulled it from the donor. Only when I noticed my speedo was way off that I discovered my "find".
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: RapidRobert]
#2087949
06/07/16 08:33 PM
06/07/16 08:33 PM
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Joined: Dec 2005
Posts: 1,159 Cruising!
QuickDodge
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super stock
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Yeah I remember the 2:45 listed I just dont remember exactly what axle. that 2.2 was that for 70's EPA? mileage numbers! The one I had was in a 1983 (I believe??) Grand Fury. Oddly enough, that car was an ex-police car! It was not a police car intended for pursuit work, as it had the 318 2 bbl engine. It did not have all the other heavy duty features police cars typically carried either. The car was kind of a cross between a civilian Grand Fury and a Police Pursuit Grand Fury. According to the paper work that came with the car, it was last used by a state prison. I do not know if the prison ordered the car, or if it was given to the prison after being used by a police agency. Swapping out the axle helped it a bit, but the car still did not run right. I tried tuning up the engine, but it still lacked power. Finally, I realized the engine had internal problems. I Pulled the 2.94 sure grip back out of it, along with a few other parts, and junked the rest! Today, I wouldn't have so impulsively junked that car. It was the nicest driving M-body I owned.
Last edited by QuickDodge; 06/07/16 08:39 PM.
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Re: 2.40-something pumpkin for 8-3/4 rear
[Re: QuickDodge]
#2088035
06/07/16 11:11 PM
06/07/16 11:11 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Yeah I had an 83 cordoba 318 2bbl & it was the easiest starting vehicle I have even owned, shoulda kept it, hindsight. On the mileage regs with some thought I think it was COPO rather than the EPA
live every 24 hour block of time like it's your last day on earth
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