Gears :)
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Postmaster
Joined: Apr 2006
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From: Neptune Beach, FL
Gears :)
I called Austin Drive Train today to get my pricing on the gears.. Looking at either flipping from the 4.5" Hanger to a 6" Suspension, or possibly just adding minipacks to bring me from 4.5 to 6.5".. Marty has a truck he did that to and it looks pretty nice.. Course that would push me to 38" Toyo Open Country MTs next go round.. So I'm deciding whether I should go with 4.10 or 4.30.. Want to try and get my ratio pretty close to the 3.73 ratio.. Dont want my tac at 3k on the highway running 70 in 5th gear..
Cost tho, he said would be between 1500-1700 depending on what ratio I do.. Not bad, lot cheaper then I expected!
Cost tho, he said would be between 1500-1700 depending on what ratio I do.. Not bad, lot cheaper then I expected!
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Postmaster
Joined: Apr 2006
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From: Neptune Beach, FL
I got 3.73 and 35s and she sits at 2000 rpms at 70.. Wonder why yours is 200rpms higher then mine.. How's your take off on the 4.10s? Do you think I should go 4.10 or 4.30s on 38's?
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Storm.
Use this link below as a good tool to calculate tire size vs. gear size.
http://www.4lo.com/calc/geartire.htm
Use this link below as a good tool to calculate tire size vs. gear size.
http://www.4lo.com/calc/geartire.htm
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Joined: Dec 2006
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From: NorCal
I would say to go with at least 4.30's. I have 4.30's with 35" Extreme A/T's and think it is a good match.
If you are going to 38" tires, you have to factor in the extra wind resistance from going higher and having more surface area from the tires while travelling 70 mph down the highway.
If you were going to do alot of towing, I would suggest 4.56 for the power.
If you are going to 38" tires, you have to factor in the extra wind resistance from going higher and having more surface area from the tires while travelling 70 mph down the highway.
If you were going to do alot of towing, I would suggest 4.56 for the power.
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Joined: Apr 2006
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From: Neptune Beach, FL
I will have a newer engine soon that will be pushing some HP.. basically this is how I see it.. 4.10s on stock F250 will give us some serious off the line jump.. I want to get that same feeling but with 38's.. Not looking to drag race, but at same token I dont want to strain the engine etc..
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Joined: Dec 2002
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From: IL, USA
If you are deciding between 4.10s and 4.30s......4.30s all the way.
I run 4.56s with 38s.
Here's a chart I made up that will show what rpms you'll push at 70mph.....your stock tires were 31.6":
http://www.FTEs diesel forums.com/fo...ead.php?t=2896
Here's my rpms with 4.56s and 38s:
I run 4.56s with 38s.
Here's a chart I made up that will show what rpms you'll push at 70mph.....your stock tires were 31.6":
http://www.FTEs diesel forums.com/fo...ead.php?t=2896
Here's my rpms with 4.56s and 38s:
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Postmaster
Joined: Apr 2006
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From: Neptune Beach, FL
Originally Posted by DCSpecial
If you are deciding between 4.10s and 4.30s......4.30s all the way.
I run 4.56s with 38s.
Here's a chart I made up that will show what rpms you'll push at 70mph.....your stock tires were 31.6":
http://www.FTEs diesel forums.com/forums/showthread.php?t=2896
Here's my rpms with 4.56s and 38s:
I run 4.56s with 38s.
Here's a chart I made up that will show what rpms you'll push at 70mph.....your stock tires were 31.6":
http://www.FTEs diesel forums.com/forums/showthread.php?t=2896
Here's my rpms with 4.56s and 38s:
Based on your chart it says that
38...............4.56....................1976
Is what I'm trying to do is keep 70mph close to 2k? as stock was.. Do I need to go to 4.88.. How does your run with the 4.56? Does it still have some power to move or do you feel like a big slug just crawling? I dont want big tires, aggressive stance but no ***** under the wheels.. Right now shes pretty damn quick on 35's and 3.73.. I kinda like to keep the same..
As for tranny, she's going to be beefed up before I even throw these on..
Post Fiend
Joined: Dec 2002
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From: IL, USA
That is my real speed....I run a Superlift truspeed to correct my speedo.
I lifted off the throttle for a second when I took the pic. At 90mph it's ~2750rpms.
I've pinned the speedo plenty of times and I still have some room before the redline.
You don't want 4.88s unless you plan on 40-41s.
I still have plenty of get up and go....and often break the tires loose (in the economy setting) if I have to get on the truck hard after taking a turn. With the stock trans it would break the tires loose of the line, 1-2 shift and 3-4 shift. Now with the BTS it won't break the tires loose, but that's because it's doing a better job of transfering the power to the ground.
4.30s or 4.56s would be my recommendation for 38s.
I lifted off the throttle for a second when I took the pic. At 90mph it's ~2750rpms.
I've pinned the speedo plenty of times and I still have some room before the redline.
You don't want 4.88s unless you plan on 40-41s.
I still have plenty of get up and go....and often break the tires loose (in the economy setting) if I have to get on the truck hard after taking a turn. With the stock trans it would break the tires loose of the line, 1-2 shift and 3-4 shift. Now with the BTS it won't break the tires loose, but that's because it's doing a better job of transfering the power to the ground.
4.30s or 4.56s would be my recommendation for 38s.
