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fordpower View Drop Down
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    Posted: 19-December-2012 at 7:18AM
Does anyone know what ratio is I or1 in a 78 ltd2 I know b is 2.47
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Post Options Post Options   Thanks (0) Thanks(0)   Quote occupant Quote  Post ReplyReply Direct Link To This Post Posted: 19-December-2012 at 9:51AM
A numerical 1 is 2.50 open rear

There is no letter "I" that I'm aware of. Maybe it's a T? which is 2.47?

Here's a chart for reference:

Conventional......Lock......Ratio
     1.............J.........2.50
     2.............K.........2.75
     3.............L.........2.79
     4.............M.........3.18 ('78), 2.80 ('69-'72)
     5.............N.........3.07 ('75-'78) 2.83 ('69-'70)
     6.............O.........3.00
     7.............P.........3.40 ('73-'78) 3.10 ('69-'70)
     8.............Q.........2.73 ('78) 3.20 ('69-'70) 3.18 ('72)
     9.............R.........3.25
     A.............S.........3.50
     B.............T.........2.47 ('78) 3.07 ('69-'72)
     C.............U.........3.55 ('72) 3.08 ('69-'70)
     D.............V.........3.91
     E.............W.........4.30
     F.............X.........2.33 ('70)
     G.............X.........3.55 ('73-'78)
     H.......................3.78 ('72)
     Y.......................3.08 ('78) 4.11 lock ('72)
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fordpower View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 19-December-2012 at 11:01AM
thanks, maybe its a t when I get it back in garage i'll check it better.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Psquare75 Quote  Post ReplyReply Direct Link To This Post Posted: 19-December-2012 at 11:17AM
either 2.47 or 2.75. Most likely, 2.47
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 20-December-2012 at 4:43AM
ya same as the 79 only maybe a locker I need something in the 3's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Regul8r Quote  Post ReplyReply Direct Link To This Post Posted: 20-December-2012 at 5:02AM
I would love a 2.47 for the trip to Carlisle!
That thing would just CRUISE on the highway!
Imagine idling at 75MPH in OD?
Bet I would have to spend some time shifting the AOD manually!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Psquare75 Quote  Post ReplyReply Direct Link To This Post Posted: 20-December-2012 at 7:02AM
My 77 had 2.47s with the 460 when I got it.

3K @ 80 MPH. 60 was 2100 I think. The car was pretty lazy until 65 MPH, lol.

It still wasn't all THAT hot on gas.. 13.5 MPG was the best I could ever achieve with it combined backroads/highway.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 20-December-2012 at 9:18AM
constant lugging in ultra low rpm's doesn't make for good efficiency
 
there's probably a break-even gear somewhere a little higher that would allow the engine to 'run' a little more and give the same MPG,
maybe even slightly better depending upon how much city vs highway?
 
a cam, intake & carb specifically selected for low RPM use could bring more gains


Edited by Rockatansky - 20-December-2012 at 9:19AM
72 GT Ute
   
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Psquare75 Quote  Post ReplyReply Direct Link To This Post Posted: 20-December-2012 at 9:22AM
Originally posted by Rockatansky Rockatansky wrote:

constant lugging in ultra low rpm's doesn't make for good efficiency

 
a cam, intake & carb specifically selected for low RPM use could bring more gains

Tow truck cam Crane 260! LOL
Paul
77 XR7 460/C6/3.00:1 *SOLD*
78 XR7 523/C6/3.5:1
79 F100 460/TKO500/3.25:1
'I also have some left over potatoes-I understand you can generate electricity from them'- Foote500
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Robbdtme Quote  Post ReplyReply Direct Link To This Post Posted: 20-December-2012 at 10:02AM
I could cry, The Montego GT I junked had axle U. 
Johnny cash Special 74-75-76 freak. 77 XR7. 78 LTD II sport looks pretty but poop 302 in it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fordpower Quote  Post ReplyReply Direct Link To This Post Posted: 20-December-2012 at 11:46AM
I don't know much about ratio ,but the ltd gets 18 to 20 at 65-70 with 2.47's and about 10-12 short hops the window sticker states over all 13-15 mpg. I was told that325 with aod would be about the same highway better in city.I was also told block off egr valve it would be better not got worse.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 20-December-2012 at 12:19PM
if the carb & ignition are set up for EGR and it's working, that's what'll work best until you make all the necessary changes
 
3.55 gear gone to the chipper Cry
 
Comp does a 252 cam too, they have a profile for a 240 'taxi cam' but it's not listed any more
 
 
Offy made Dual Port intakes for Cobra-Jet heads, did Edelbrock ever make an SP2P for 460?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Psquare75 Quote  Post ReplyReply Direct Link To This Post Posted: 20-December-2012 at 2:35PM
I think so. Mine was a Performer with a 750 Holley. This engine made its way over to my F100. My truck has had 4 engines/drivetrains in it.. small blocks with 2.75, big blocks with 3.5s.. 3.25s.. etc. 

ALL were 9- 11 MPG. Unreal, lol.

Paul
77 XR7 460/C6/3.00:1 *SOLD*
78 XR7 523/C6/3.5:1
79 F100 460/TKO500/3.25:1
'I also have some left over potatoes-I understand you can generate electricity from them'- Foote500
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Robbdtme Quote  Post ReplyReply Direct Link To This Post Posted: 20-December-2012 at 2:52PM
All about the Giddy Giddy Gitty up and go not milage for me....  Just turned 73k original one the the cougar and 3k on the new 434.
I think while lower rpms maybe save your rings a happy axle ratio that runs your motor setup at its best will give you better mpg.
Johnny cash Special 74-75-76 freak. 77 XR7. 78 LTD II sport looks pretty but poop 302 in it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Psquare75 Quote  Post ReplyReply Direct Link To This Post Posted: 20-December-2012 at 3:09PM
Mileage one reason is why my '78 is going stick.. Confused
Paul
77 XR7 460/C6/3.00:1 *SOLD*
78 XR7 523/C6/3.5:1
79 F100 460/TKO500/3.25:1
'I also have some left over potatoes-I understand you can generate electricity from them'- Foote500
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lynchster Quote  Post ReplyReply Direct Link To This Post Posted: 20-December-2012 at 4:04PM
Originally posted by Regul8r Regul8r wrote:

I would love a 2.47 for the trip to Carlisle!
That thing would just CRUISE on the highway!
Imagine idling at 75MPH in OD?
Bet I would have to spend some time shifting the AOD manually!
 
The Ranchero I just got rid of was idling at highway speeds. It didn't care much for inclines while in overdrive but it was a stock 302 with a 600 holley and headers. I had to keep it in drive unless I was on the interstates. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote papadeath Quote  Post ReplyReply Direct Link To This Post Posted: 27-December-2012 at 8:04AM
Pfffft! Gas mileage? I can barely afford to drive this thing even on the weekends. But, I asked for it, didn't I... Fun to drive, though, and gets many looks, especially with the baby strapped to the grille, hehe.
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