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Discussion Starter #1
Got a scheme bouncing around in my head and it requires some very high rear gears (high ratio, low number). I have a 9" rear and it's a street car. Are there any common or easy to obtain ratios in the 2:1 area? I've seen plenty of factory 2.75:1, but was wondering if there was anything even more long-legged than that.
 

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I have a 2.50:1 9 inch gearset in my garage. I'm thinking about using it in my Galaxie. have one set up with 4.11:1 and one with 2.50:1 so when I take long trips (a couple times a year) I can just swap in the 2.50:1 center section and my wallet will thank me. I do have a 3.00:1 already set up though so maybe I'll just use that and keep a little performance in my economy gearset? *sigh* Eventually I'll just get an overdrive transmission.

Anyhow, I think the 2.50:1 gearsets were pretty common in the big Lincolns. Not sure about anything lower though. What do you have up your sleeve with this project, if I may inquire?
 

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Discussion Starter #3
Yes, I think I have heard of the 2.50 ratio. Didn't know they were that common though. I'll have to look for that ratio. Well, my E4OD is sitting too low in my '69 mustang after I finally took the time to set my driveline angles. To add to that issue, the tranny is pretty wide and I guess it needs some snap ring replaced and there's no speedometer gear. On top of that, I need the Baumann trans controller (already have it but I could use that on my 4R70W instead) and a good torque converter. So it's not feasible to use the E4OD at this point. Soooo, I was looking into the TKO 600 but they are a bit pricey and the main complaint about them is the difficult/notchy/slow shifting. That's the same major issue with using the S5-42 ZF 5 speed trans used in the ford trucks with 460. It has a really low first gear so I need a low number rear to make it useful. I can deal with the far forward shifter location due to my motor being moved back 8" from stock and the 2.50 (or lower if available) gears will keep me in each gear longer so the slow shifts won't matter as much. Since I have no firewall or trans tunnel yet, I can make the ZF work and it won't hang down as low as the E4OD pan. The other bonus of using the granny gear and then overdrive is I'll have very low cruising rpms to maximize gas mileage (prob cruise in 4th except on interstate when I can kick it up into 5th and maybe go 70mph at or under 1500rpm). So that's my plan, buy a 2wd ZF trans, go with the tall rear gears, and hopefully it shifts good enough for me. Since it's not a track car, I don't care much about consistent fast shifts.
 

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ScottJackson said:
Well, my E4OD is sitting too low in my '69 mustang after I finally took the time to set my driveline angles. To add to that issue, the tranny is pretty wide and I guess it needs some snap ring replaced and there's no speedometer gear. On top of that, I need the Baumann trans controller (already have it but I could use that on my 4R70W instead) and a good torque converter. So it's not feasible to use the E4OD at this point.Since I have no firewall or trans tunnel yet, I can make the ZF work and it won't hang down as low as the E4OD pan.
You just described why I've been happily propelled by a Lentech Strip Terminator AOD overdrive transmission for many years now (rated for 1,000 HP - 1,500 HP available).
http://www.460ford.com/viewtopic.php?t=2797
 

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Discussion Starter #5
I just don't know how long an AOD, no matter how well built, will last behind 900-1000hp and the same for torque. Not saying it wouldn't hold it, but I'd like to maximize the trans life as it'll be a 100% street car and I want to go on some distance trips with it. I know my '99 4R70W can be pretty stout for a minimal amount of $$$ (I have a 10" Level 10 converter with anti-balloon plate and I'll put in a good shift kit) but I don't think it'd hold up. I'm also looking into the Toyota R154 as a possible option.

I still think the E4OD would be a nice trans, if I didn't have my motor set so far back and I had the $$$ to get a good converter and have it gone through with the basic mods and speedo toothed output shaft. Oh well...
 

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when i got a lincoln varsallies disc brake 9" for my pro street 56 f-100 PU, the center section had a 2.47 it it. i think my motor would RPM about 1600 at 55 with 31 mudders on my 69 f-100 and get around 16 mpg with a modded 300 w/t-18...........ron
 

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Yep, the 2.47 was the lowest numerical gear used in the 9" and was used behind the 302/351M/400 cars, the 460 got the 2.50 for whatever reason.

Rick S.
 

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Look for a 1978

The 2.5 ratio gear sets that I have seen in a nine inch were all in 460 powered cars, and all of which were in (only) 1978 Full Size Fords and Mercurys. I suspect that Lincolns might have been the same. Prior to 1978 the 2.75 seems to be the common ratio, along with the 3.00.

The 351 and 400 engined cars that I have seen used the other rear axle, none the nine inch.

I cannot say for ratios after 1978, I quit looking after I found what I needed so I don't know much after that date of manufacture.
 

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Look for a 1978

The 2.5 ratio gear sets that I have seen in a nine inch were all in 460 powered cars, and all of which were in (only) 1978 Full Size Fords and Mercurys. I suspect that Lincolns might have been the same. Prior to 1978 the 2.75 seems to be the common ratio, along with the 3.00.

The 351 and 400 engined cars that I have seen used the other rear axle, none the nine inch.

I cannot say for ratios after 1978, I quit looking after I found what I needed so I don't know much after that date of manufacture.
 

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So far as the aftermarket is concerned, 2.84 seems to be the lowest commonly available new, nowadays. Good used carriers with 2.50 gears are fairly easy to find, & cheap. :)
 
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