Rear end ratio

Trans, clutch, driveshaft, and rearend.

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Rear end ratio

Postby Unproffesional-Steve » Thu Jan 23, 2003 9:15 pm

My 1985 E150 Van has the 300-6, with the the 4 speed manual overdrive transmission. It's totally stock, everything. It's works pretty good except the rear end gear ratio is too conservative. It's got a 3.00 ratio ( ford 9 inch rear end) and I use a 235 X 15 tire. I don't even need (or use) the O.D. What gear ratio do you experts out there suggest for general purpose driving? I was thinking 3.5, 3.7, or 3.9.
I live in a very hilly city, ocasionally tow a 1500 lb boat, and I'm on the freeway everyday.
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Postby StrangeRanger » Thu Jan 23, 2003 9:59 pm

Look at the RUG section of http://www.fordsix.com/tech/trucktranny/trucktranny.htm your ratios should be similar. I'm guessing a 3.5 rear would give you the most utility.
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Postby CZLN6 » Fri Jan 24, 2003 11:03 am

Howdy Steve:

I swapped the 2.79:1 in my '80 F100 for a 3.5:1 and loved the difference. Much easier on clutches and more fun to drive. I pulled a horse trailer all over the Intermountain west. Used 3rd when hauling and held speed to about 60 - 65 mph. Still got about 22 mpg when not hauling anything and could cruise comfortably at 70 mph.

I did the same conversion in my '92 Mustang convert, with an AOD and got similiar results- but that was an 8.8 rear end.

3.5:1 pumpkins are fairly common.

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/
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Postby Unproffesional-Steve » Fri Jan 24, 2003 9:06 pm

Thanx for the reponses. Very helpful. It's my first time on ANY type of chat room. I haven't figured everything out yet. But it's a lot of fun.
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Postby Hoxviii » Sun Jan 26, 2003 10:32 pm

I swapped the 2.79:1 in my '80 F100 for a 3.5:1


2.79 rear end?!! Can you really even call that a truck? Anyway I'd go for either a 3.5 or a 3.7, the both provide real good all around power. I lean towards the 3.7 as it provides a bit more umph for towing without severely compromisng gas mileage or top end
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Postby THE FRENCHTOWN FLYER » Mon Jan 27, 2003 10:17 am

I'm using a 2.47 rear gear in my drag race truck - good on gas!

...plus the theoretical top speed is 177 MPH.

I've also got a '85 E150 / 300 / 4spdOD / 3.0 9". I think a 3.50 would be about right. It certainly would make trailer towing more fun without putting a big dent in MPG.

By the way, do you know how to turn off the amber "emissions" light on the dash? I understand it's not an alarm light, just a reminder light to get the engine serviced. (Mine's been on for the last 150K.) Wife kinda likes the warm ambience it creates but I would just as soon switch it off if I could find out how.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING
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Postby Hoxviii » Tue Jan 28, 2003 11:34 pm

I had a VW with an EGR/emissions reminder light (but no EGR/emissions system) so i just pulled the bulb for the light, solved that problem real quick like.
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TRANNY

Postby LEROY POLL » Thu Jan 30, 2003 1:44 am

HELLO STEVE

I HAD A 1977 12 PASS. E230 WITH STANDARD. THE REAR END WAS A DANA HEAVY DUTY W/ 3.73 GEARS. TIRES WERE 10X16.5. THEY WERE 30 INCHES HIGH. THE 3.73 WAS ALITTLE TOO LOW. BUT FOR THE 12 PASS. I HAD TO HAVE THAT GEAR.

I LATER WENT TO AN ADVANCED ADAPTOR RANGER OVERDRIVE. IT MADE A BIG DIFFERANCE. WAS ABLE TO GET 18.5 ON HIGHWAY. WITH NO LOAD IT WAS EASY TO START OUT IN THE OVERDRIVE.

I PUT THE SAME OD/TRANNY (THAT YOU HAVE NOW) IN A FRIENDS VAN JUST LIKE MINE. IT WAS A THREE SPEED W/OD. THE OVERDRIVE RATIO WAS THE SAME AS THE RANGER OD/TRANNY. I BELIEVE IT WAS .073. HE HAD 3.54 GEAR RATIO DANA REAR END. HE SAID IT WORKED WELL.

BOTH OF THESE WERE 351 V8 MOTORS. I'M SURE IF YOU GO TO THE 3.7 OR 3.5 GEAR YOU WILL BE ABLE TO USE THE OVERDRIVE AND GET BETTER PICKUP.

YOUR OD/RATIO NOW W/3.00 GEAR IS........... .73X3.00= 2.19
YOUR OD/WITH NEW GR. 3.50 WILL BE........... .73X3.50= 2.55
YOUR OD/WITH NEW GR. 3.70 WILL BE........... .73X3.70= 2.70

THE 3.70 GEAR LOOKS TO BE A GOOD FIT!!!

BOTH NEW GEARS WILL MAKE THE OVERDRIVE USEABLE NOW.

LOTS OF LUCK....LOL.

LIVE IN GRACE

LEROY POLL
1963 FAIRLANE 2 DOOR 221 V-8 (4 SPD )
1963 1/2 S-22 HT COMET. W/ INSTALLED T-5.
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Postby Guest » Thu Jan 30, 2003 2:07 am

Wait, so how did you get your ADVANCED ADAPTOR RANGER OVERDRIVE? How much was it, and do they make one for the NP435? My Bronc has 3.55 gears but with 32" tires its kind of a dog, plus there's no overdrive what-so-ever. I really want to find out how to put an overdrive on mine withoiut that much dificulty.

By the way I would go with the 3.73 gears, they look like a good fit. Check e-bay because the past few times they've had gears for less than $100!
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Postby StrangeRanger » Thu Jan 30, 2003 9:13 am

They're about $1550 and they go between the tranny and the bellhousing.
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tranny

Postby LEROY POLL » Fri Jan 31, 2003 5:12 pm

HELLO BTB

YOU SHOULD SEND FOR THEIR CATALOG, I BELIEVE IT'S FREE. THEY ARE CLOSE ENOUGH TO DRIVE DOWN AND PICK-UP. THEY ARE IN CENTRAL CALIF. THAT'S NOT TOO FAR FROM YOU.

FOR THE 4X4 THEIR ARE OTHER ADAPTOR YOU WILL NEED. THE PRICE WILL BE IN THE $1900-$2500 RANGE. YOU WILL NEED TO KNOW HOW YOU WILL WANT TO SHIFT THE TRANNY, AND HOW YOU WILL HOOK IT UP.

THIS TRANNY IS A VERY GOOD ADD-ON!

LOTS OF LUCK....LOL

LIVE IN GRACE

LEROY POLL
1963 FAIRLANE 2 DOOR 221 V-8 (4 SPD )
1963 1/2 S-22 HT COMET. W/ INSTALLED T-5.
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Postby Unproffesional-Steve » Sun Feb 02, 2003 5:35 pm

Thank you for all the replies. I went to the Pull-A-Part wrecking yard in Everett WA, and walked out with a good looking 3.5 carrier for 56.50$ I wanted a 3.70 ratio but none were available. A Ring and Pinion shop in Snohomish county wanted 500$ to install new gears in my old carrier. The gears are installed and work perfectly. The old 300-6 E150 van is a much better all around driver now.
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