Found 9" rear; gearing ?
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Logistics Pro
Joined: Jul 2004
Posts: 4,364
Likes: 83
From: Utah
Found 9" rear; gearing ?
So I had found about 5 68-72 trucks for rear end swaps last winter and when I went last week to finally pull one the yard was totally gone, not a single car. there is a new highway being built. So Sunday I went to another pick & pull (with higher prices arrgh) to find a 9" rear.
I figured I would have to settle for one with a ratio of 3.50 but figured optimum one would be 3.25, all I could find was few 3.50 and one 3.00
I ended up getting the one with 3.00 gearing.
This truck should have no problem cruising freeway speeds,
going in my 51 F1 flathead, with a S10 T-5 trans o.86 overdrive.
So my question is would there be a noticable difference between the 3.0 and a 3.5 rear ratio? Im wondering now if I should have gone with a 3.5?
its not bolted in yet so I can always change my mind I guess./ also they wanted to charge me $40 more for the drums which had large grooves in them so they would need to be turned and they were fairly rusty on outside. where is the best (cheapest) place to buy some new ones or gently used?? guess I could go back and scrounge for a better set for the $40 ?
Thanks
Josh
I figured I would have to settle for one with a ratio of 3.50 but figured optimum one would be 3.25, all I could find was few 3.50 and one 3.00
I ended up getting the one with 3.00 gearing.
This truck should have no problem cruising freeway speeds,
going in my 51 F1 flathead, with a S10 T-5 trans o.86 overdrive.So my question is would there be a noticable difference between the 3.0 and a 3.5 rear ratio? Im wondering now if I should have gone with a 3.5?
its not bolted in yet so I can always change my mind I guess./ also they wanted to charge me $40 more for the drums which had large grooves in them so they would need to be turned and they were fairly rusty on outside. where is the best (cheapest) place to buy some new ones or gently used?? guess I could go back and scrounge for a better set for the $40 ?
Thanks
Josh
Senior User
Joined: Nov 2006
Posts: 463
Likes: 0
What size of rear tires?
I have 16s on mine with a 700r4 (overdrive) 3.50 gear and at 70 mph = 2250 rpm. I think your 3.00 would be too low. Determine diameter of tire; then google an rpm calculator.
Prolly be able to buy drums at an auto parts store....but may have to have a set to "turn in".
I have 16s on mine with a 700r4 (overdrive) 3.50 gear and at 70 mph = 2250 rpm. I think your 3.00 would be too low. Determine diameter of tire; then google an rpm calculator.
Prolly be able to buy drums at an auto parts store....but may have to have a set to "turn in".
Post Fiend
Joined: May 2008
Posts: 7,641
Likes: 21
From: Poway, Ca.
Here is an excellent Gear ratio/speed calculator. Until I read the part about the .86 overdrive, I thought the gearing would be perfect (with 15" wheels) fifth may be a little high on the old 89 HP (net) Flatty with 16 inch wheels. There's about 10mph difference in 5th at 2000rpm between the 3.0 and the 3.5
But if you want to find out for sure, I found it best to measure the roll out and enter the gearing numbers in the calculator.
Gear Ratio Calculator
But if you want to find out for sure, I found it best to measure the roll out and enter the gearing numbers in the calculator.
Gear Ratio Calculator
Thread Starter
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Logistics Pro
Joined: Jul 2004
Posts: 4,364
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From: Utah
I am planning on using the stock 16" wheels on my truck, not sure what size the actual rubber (rollout) will be and as far as height etc, I did try a few things on the gearing calculator, maybe I'll never need to go into overdrive? LOL
thanks
Josh
thanks
Josh
Cargo Master
Joined: Apr 2005
Posts: 3,337
Likes: 165
From: Harpswell Maine
Josh,
The 38 Ford Woodie that is in my gallery had a basically stock 3.78 rear with a Columbia 2 speed rear end. It ran 16" original tires and the stock 85 hp flatmotor. The columbia is a 37% over drive, considerably higher than the T5. The weight of the woodie I believe exceeds the weight of an F-1. If I am doing it correctly, the final drive ratio was a little lower on my former Woodie than it would be on your F-1 running a T5 with 3.00 gears.
I was never unhappy with the net drive ratio on the Woodie
Now obn the F-1, I am setting mine up to tow up to 5000#. I will run a 3.70 9 inch behind a strong 350 with an AOD. With my setup, 70 MPH works out to 2050 rpm in overdrive.
The 38 Ford Woodie that is in my gallery had a basically stock 3.78 rear with a Columbia 2 speed rear end. It ran 16" original tires and the stock 85 hp flatmotor. The columbia is a 37% over drive, considerably higher than the T5. The weight of the woodie I believe exceeds the weight of an F-1. If I am doing it correctly, the final drive ratio was a little lower on my former Woodie than it would be on your F-1 running a T5 with 3.00 gears.
I was never unhappy with the net drive ratio on the Woodie
Now obn the F-1, I am setting mine up to tow up to 5000#. I will run a 3.70 9 inch behind a strong 350 with an AOD. With my setup, 70 MPH works out to 2050 rpm in overdrive.
Fleet Mechanic
Joined: Apr 2008
Posts: 1,373
Likes: 6
From: Moore (or less), OK.
I have the 3.0 in my 56. With the 289, C4, and 275/50x15" wheels I get 16 mpg at 65 mph.
It pulls 86 mph at 17.5 or so seconds in the quarter mile. Not exactly the quickest but I am happy with it.
It pulls 86 mph at 17.5 or so seconds in the quarter mile. Not exactly the quickest but I am happy with it.
Cargo Master
Joined: Apr 2007
Posts: 2,063
Likes: 38
From: Valley Center, California
Lots of excellent comments here. With my usual reckless banter I'd say a Flattie with a T-5 would prefer the 3:50.
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Logistics Pro
Joined: Jul 2004
Posts: 4,364
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From: Utah
Thanks everyone for the comments tips etc, This is so typical of me to go and do something and find out after that I was on the wrong path??? shoud have consulted here first I guess, ahh maybe I just wanted to go back and pull another rear end next week
Maybe I could go with 15" wheels/tires would that help me any? I had just figured to go with the 16" stockers since I had them and going mostly original look but I guess I really dont know, maybe dropping it a bit and using 15" would be a good look too....
so probably back to the pull and sware for a 3.50 3rd times a charm LOL
Josh
Maybe I could go with 15" wheels/tires would that help me any? I had just figured to go with the 16" stockers since I had them and going mostly original look but I guess I really dont know, maybe dropping it a bit and using 15" would be a good look too....
so probably back to the pull and sware for a 3.50
3rd times a charm LOL Josh
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Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
The 38 Ford Woodie that is in my gallery had a basically stock 3.78 rear with a Columbia 2 speed rear end. It ran 16" original tires and the stock 85 hp flatmotor. The columbia is a 37% over drive, considerably higher than the T5.
The weight of the woodie I believe exceeds the weight of an F-1.
The weight of the woodie I believe exceeds the weight of an F-1.
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Logistics Pro
Joined: Jul 2004
Posts: 4,364
Likes: 83
From: Utah
Oh and another thing I forgot to mention is that the Flathead engine going in my F1 will be slightly over 100 HP it will have a 4" Merc crank with 100 thousanths overbore; 272CI not that that will make a huge difference but some, ( I hope)
Hotshot
Joined: Oct 2004
Posts: 15,882
Likes: 88
From: Durham NC
So much depends on how you will drive the truck and what you want from it. IMHO the 3.00 will be a bit steep a ratio. You aren't going to win many stoplite drags, but it's not bad enough that you'll need to slip the clutch or anything like that. It will make a good highway cruiser, loafing the FH at highway speeds.
Laughing Gas
Joined: Mar 2005
Posts: 1,109
Likes: 9
From: Thornton, Colorado
Changing out the 3rd member
I have a 3rd member out of a Cougar. The guy I bought it from said it is a 2.84 gear ratio. I am considering rebuilding it and putting it into a 59 F-100 with a 3 on the tree and and a 223. I am wondering how I know if the gear ratio is too high. I plan on tooling around town in it, but I would like to be able to do 60 mph without feeling like the truck is shaking apart. Does anyone have any ideas on how I can find this out. There have to be charts or something right???
Lead Driver
Joined: Apr 2002
Posts: 8,813
Likes: 13
From: Littleton, New Hampshire
I have a 3rd member out of a Cougar. The guy I bought it from said it is a 2.84 gear ratio. I am considering rebuilding it and putting it into a 59 F-100 with a 3 on the tree and and a 223. I am wondering how I know if the gear ratio is too high. I plan on tooling around town in it, but I would like to be able to do 60 mph without feeling like the truck is shaking apart. Does anyone have any ideas on how I can find this out. There have to be charts or something right???