MidnightSwinger
Well-Known Member
My Spirit of ‘76 Dart Lite had the A833 OD with 2.76 gears from the factory! Without a doubt, the slowest car I ever owned, even compared to my 86 D-100 with a Slant and A833 OD, but at least that one had 3.91’s.
T5 Five speed slant six 74 Dart Sport.
- Thread starter 76Scamp
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Correct, and yet, when you tell people that, they still wanna curl up in a ball and get in their safe space. I have a 4.11 gear I just installed in my ford 9" slated to go under my 64 Valiant with a Ford T5 five speed. With the .68 OD ratio, I will have a 2.79 final drive ratio. My plans are to run a 245 60 14 rear tire so it will have some height to it as well. Should be really nice with the hot slant 6.
....and I bet that thing would have gotten much better mileage with a 3.55 or even a 3.91 and no matter what you do, you cannot make some folks understand that. Are you listening, @greymouser7 ? Some folks think the lower numerically you go with gear ratio, the better mileage you get and that's just not true at all. If you get an engine so far out of its optimal operating range, you ruin any chance of good economy, not to mention decent power. With that 2.76 gear, I bet you were downshifting with the slightest head wind. That had to SUCK.
76Scamp
Well-Known Member
That is what killed the 700R4 in one of my S10s. .7 Overdrive, 3.08 gears with a 26" tall tire. I couldn't drive around town in OD. Would barely tip in just to accelerate and it would shift out of it; sometimes down to 2nd if I leaned in too far. Only turned 2000rpm to do 70mph. Wore itself out constantly shifting up and down. That trans lasted 50k miles. My dad's 1994 Chevy 1500 on the other hand has 27.5" tall tires, a 4.10 gear, the same .7 OD, and is turning 2500rpm to do 70. I replaced the transmission at 350k miles. Replaced the engine at 798k miles, and then the transmission again at 900k. That big truck with a 4.3l V6 gets 25mpg on the highway. High gears are fine for a three speed or non-od four speed, but not for an od trans. Hell, I had an 80s Monte Carlo with a 2.19 gear and a three speed auto.
MidnightSwinger
Well-Known Member
Had to stay in first until 25 mph, no tach but it was screaming for a slant, then it lugged in 2nd, never felt like it would recover from a shift.
AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
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Again absolutely true
When shopping for transmission for my combo, I found out a few things;
The 2.47 low 4-gear was not gonna work at all.
the 2.66 was not much better. I needed more on the bottom and less on the top.
So I started throwin all the chunks I had at the 2.66, until I found a First gear that I really liked,
Then I threw other chunks at it until I found what the engine liked to cruise at.
Then I calculated the ratio spread I needed, or hoped for.
What I found was that the engine liked to cruise at not much less than 2200, and I liked a starter gear of about 10/1.
To cruise at ~2200 requires a final drive gear of about 2.76
So the total spread was from 10.0 to 2.76 which is
10/2.76= 3.62.
To run the 2.66 box to get a 10/1 starter requires a 3.76gear, rounds to 3.73s. so the spread is (2.66 x 3.73)/3.73= 2.66 so obviously at only 73% of what I need, that will never work.
And; to run the 3.09 overdrive at 10/1 requires a 3.23 rear gear, which makes top gear 3.23 x .73 =2.36, so the spread is
(3.09 x 3.23)/2.36=4.23 which is 16.8% too big
So I latched on to the '78 GVod. with the 2.66 box, to get 10/1 starter requires 3.73s again, making overdrive into 2.91s
So the spread is (2.66x 3.73)/2.91 = 3.57, daym that's close so I bought one installed it and loved it.
For the keckuvit, I installed a 3.09low, Command box and 3.55s
This made the starter 10.97, and the cruiser 2.77, and the spread is now, 10.97/2.77=3.96 which is even more fun. That was around 2004, and there's no going back cuz I sold everything bigger than 3.55s, except a set of 4.88s.
I ran this box with 3.23s and a smaller torquier cam and she loved it. The starter was 9.98 and the cruiser was 3.52, so the spread was
9.98/2.52= still 3.96 of course, but 65= 2040
For chits and giggles I installed that GVod behind my 833od for like a year or two, with various gears, and ended up with 3.55s. That made a starter of 10.97 and a double overdrive of 1.97, a spread of
10.97/1.97=5.57 This made 65= 1600 annnnnd the small-cammed 367 pulled it!
I highly recommend to all you gear-bangers to just once in your life do this with a Thermoquad , and floor it from 55 mph with the windows up so you can hear that mighty 850 roar, and roar, and roarsumore ............................ , cuz you'll run out of power long before you run outta revs, lol. By the math, 120mph is still only 3000rpm.
I ended up running that combo with 4.30s, for the sweet parade gear of 3.5mph=580 rpm.
greymouser7
Vagrant Vagabond “Veni Vidi Vici”
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Is there any guesstimate of speed (or high speed DURATION) limitation with the 4.11 axle gears whem the final drive is roughly 2.8? Is there a necessity for higher frequency interval for axle maintenance (like drain/fill gear oil intervals) or concerns for bearings? Thank you. Thanks for all of your help and effort. I hope that you and Kitty are doing well!
Dumb it down for me brother.
greymouser7
Vagrant Vagabond “Veni Vidi Vici”
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20 years ago i bought a 73 satellite with a swapped axle. the seller/ previous owner said that I shouldn't drive long distances at 80 mph because it was a 4.11 geared axle, and that it couldn't take it regularly (driving an hour south to jacksonville, fl) and back daily...
Oh well, with an OD and a 4.10 the final drive is dependent on the OD ratio. Lets just say it's .68 since that's very common. That means in OD, your rear gear is effectively a 2.78. So yeah, that can cruise the rest of your life at 75MPH.
michiganpat
Well-Known Member
axle should handle it just fine, but 4.11's without OD and a 27" tall tire, 70MPH is 3600 RPM, which if the exhaust is somewhat loud could be very fatiguing, and running an engine at that speed for that duration would be insanely fuel inefficient, and I guess could shorten the life of the engine (time wise)
michiganpat
Well-Known Member
my duster with 25" tall tires, stock 1bbl slant6, OD and 3.23 got it's best mileage at 60mph (about 30mpg) (about 1900 RPM). 65 it drops down to 27-28, 70MPH more like 25-26.
michiganpat
Well-Known Member
all fair points. for the shifter, you might be able to take it apart and heat up the lever and bend it forward about 45 degrees and then make a custom upper handle....trying to remember what those levers are made of (I worked at the company that made the shifters for BW, Tremec, and NVG 20-25 years ago... *THINK* it's 12L14 steel)
....and that's the "magic number". "Right around" 2000 RPM, give or take. It's a little different for every combination, but that's the general neighborhood.
Great hotroding!
Now maybe there will be a market for my early slant bells!!!
Now maybe there will be a market for my early slant bells!!!
Yup since Gill Welding makes T5 adapters with that bolt pattern. Hay, @WarHammer we're talkin about yall again. lolGreat hotroding!
Now maybe there will be a market for my early slant bells!!!
Maybe my mind is fuzzy today, but the T5 and the slant seems like a great combo. Can't that T5 be sourced used plenty cheap, even cheap enough for the slant crowd!!???? I have 3 of those slant bells for sale!!!!
The T-5 came in different ratios too. I thought that the 5.0 Mustangs had a version with a deeper 1st gear than the Camaros that used the T-5.
76Scamp
Well-Known Member
They can still be found relatively cheap if you search hard enough. Might still find a fox body or sn95 Mustang in the junkyard with one. Although my engine is not stock, I have been loving this conversion behind the slant in my car.Maybe my mind is fuzzy today, but the T5 and the slant seems like a great combo. Can't that T5 be sourced used plenty cheap, even cheap enough for the slant crowd!!???? I have 3 of those slant bells for sale!!!!
michiganpat
Well-Known Member
hard to find anything older than late 90's/early '00's in junkyards around me....
Thats for darn sure..... wife and I drove (OK so I drove while she had a death grip on her door handle) 13 hours two days ago to go to a boneyard with nothing but old stuff, several hundred cars. Picked up our stuff and back on the road. There and back and thru D/FW metroplex is no joyride for us old people!!
Damn 18 wheelers!
Dale Davies
Well-Known Member
The S10 T5 trans has a deep.first gear like the A833OD. Good to get rolling. Kind of like the old truck 4 speeds with the deep low gear.
Dale Davies
Well-Known Member
Most wreckers are 10 years or less now. Stuff that moves quickly. Anything left after a month goes to the crusher.
Dale Davies
Well-Known Member
"Profesional" does not exactly pertain to truck drivers any more. But then they spend long hours on the roads dodging complete imbiciles so they do not get tied up for hours writing accident reports and going for a piss test even when it was not their fault.
Bad part is so many 18 wheelers going down Tx I45. 6-7 on a row then I come up on them, all of a sudden one wants to pas the others and he is doing all of 1 mph faster then the rest of them!! But of course he has to jump out in front of us.
Then ther are the soccer moms going down he left lane with cruise on and doing the speed limit. Get out of my way I am HAULING ***!! This is Texas ya know ! Pilgrims!!
I'm old, sore, hurt, woreout and have to pee a lot. I used to lve o go, but I hate it if I have to go farther than 1 or 2 hours away.
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