gear ratio swap advice Dana 60 373 to ? - Ford Truck Enthusiasts Forums

Notices
1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

gear ratio swap advice Dana 60 373 to ?

Reply

 
 
 
  #1  
Old 06-19-2018, 12:42 AM
SoCal69's Avatar
SoCal69
SoCal69 is offline
Freshman User
Thread Starter
Join Date: Jun 2018
Posts: 33
SoCal69 is starting off with a positive reputation.
gear ratio swap advice Dana 60 373 to ?

I have a,69 250 C/S 390 C6 I don't haul things yet I just bought the truck rebuilt motor trans it has 374 rear gears at 65 she yelling help I need another gear !!!!!I wanted to swap the gears down the road I seen some put 325/328 what is the hghest gear that I could still haul a small camper maybe later a slide in camper I have a cam and a 500 cfm Holly that wants to run it's a toy really but it kills the fun factor beyond 65 mph .
 
Reply With Quote
  #2  
Old 06-19-2018, 06:38 AM
mrpotatohead
mrpotatohead is offline
Posting Guru
Join Date: Apr 2006
Location: NAMPA, ID.
Posts: 1,018
mrpotatohead is gaining momentum as a positive member of FTE.
Ratio

I think 3.54 is the highest ratio offered.
 
Reply With Quote
  #3  
Old 06-19-2018, 06:49 AM
ultraranger's Avatar
ultraranger
ultraranger is offline
Post Fiend
Join Date: Apr 2011
Location: Camden, Arkansas
Posts: 6,206
ultraranger has much to be proud ofultraranger has much to be proud ofultraranger has much to be proud ofultraranger has much to be proud ofultraranger has much to be proud ofultraranger has much to be proud ofultraranger has much to be proud ofultraranger has much to be proud of
A low number is a high ratio. A high number is a low ratio.

3.00:1 would be a high ratio. 4.11:1 would be a low ratio.
 
Reply With Quote
  #4  
Old 06-19-2018, 08:13 AM
mrpotatohead
mrpotatohead is offline
Posting Guru
Join Date: Apr 2006
Location: NAMPA, ID.
Posts: 1,018
mrpotatohead is gaining momentum as a positive member of FTE.
Yes and if I recall correctly the available ratios are from 3.54 to 4.56.
 
Reply With Quote
  #5  
Old 06-19-2018, 08:24 AM
gittinwidit
gittinwidit is offline
Elder User
Join Date: Mar 2003
Location: Durham, NC
Posts: 697
gittinwidit is starting off with a positive reputation.
Actually I see all the way up to 7.17 now. Aftermarket has come a long ways for the low pinion dana 60. But 3.54 is max for low. And not worth the cost from 3.73. Maybe the best bang for buck would be an overdrive.
 
Reply With Quote
  #6  
Old 06-19-2018, 05:49 PM
KTM520EXC
KTM520EXC is offline
New User
Join Date: Feb 2018
Location: Roseville, CA
Posts: 22
KTM520EXC is starting off with a positive reputation.
Consider larger rear tires to drop the rear end ratio numerically.

I.E. a 10% larger rear tire compared to stock is the equivalent of dropping your rear end ratio 3.73 * .90 = ~ 3.36.

If you were to go in that direction, I would make all 4 taller tires, due to tire rotations.

You will also have to correct your speedo gear in the tranny.

Michael
 
Reply With Quote
  #7  
Old 06-20-2018, 02:23 AM
SoCal69's Avatar
SoCal69
SoCal69 is offline
Freshman User
Thread Starter
Join Date: Jun 2018
Posts: 33
SoCal69 is starting off with a positive reputation.
I have 9.50 x16.5 firestone don't think I could go bigger unless I changed rims to a 16 then the doors open up more , I just bought the tires transforce HT changing to bigger tires and a swap to 354 would be better , I heard of the gear vendor but that too much cash for me right now what other overdrive options are there for a C6 other than gear vendor ???
 
Reply With Quote
  #8  
Old 06-21-2018, 12:57 AM
GaryKip's Avatar
GaryKip
GaryKip is offline
Postmaster
Join Date: Aug 2015
Location: Lind, WA- Eastern WA
Posts: 3,039
GaryKip is a splendid one to beholdGaryKip is a splendid one to beholdGaryKip is a splendid one to beholdGaryKip is a splendid one to beholdGaryKip is a splendid one to beholdGaryKip is a splendid one to beholdGaryKip is a splendid one to behold
You wouldn't want to go from a 16.5 to a 16.- You need a 17" or 18" rim (and tire set).
 
Reply With Quote
  #9  
Old 06-21-2018, 02:00 AM
RichS2659
RichS2659 is offline
Posting Guru
Join Date: Feb 2006
Location: North Pole, Alaska
Posts: 1,390
RichS2659 is gaining momentum as a positive member of FTE.RichS2659 is gaining momentum as a positive member of FTE.
Taller tires are the poor man's overdrive. That is why newer cars are using 17, 18, 20 inch tires. Your 3.73 gear is about perfect for a multi-use gear which allows for cruising and carrying a heavy load, such as the camper you want to put on. Get a set of Dodge 17 inch wheels. You can get them cheap from Craigslist or the JY. My son has a set on his 79 F-250 Lowboy. Your bump has the aerodynamics of a flat sheet of plywood straight up facing the wind. Your mileage can't improve much. Get rid of that gas sucking 500 cfm 2v Holley, and put on a 600 cfm 4v with vacuum secondaries with a dual exhaust. Save your money for the 4v carb and new 4v aluminum manifold instead of a minuscule gear change from 3.73 to 3.54 which will cost $1000+. You can get a 3.07 gear from a Dana 61 using a special Dana carrier, but it will cost $XXXX.

https://en.wikipedia.org/wiki/Dana_60
 
Reply With Quote
  #10  
Old 06-21-2018, 05:49 AM
00t444e's Avatar
00t444e
00t444e is online now
Elder User
Join Date: May 2017
Location: Southern OH
Posts: 687
00t444e is gaining momentum as a positive member of FTE.
Originally Posted by GaryKip View Post
You wouldn't want to go from a 16.5 to a 16.- You need a 17" or 18" rim (and tire set).
Why do you say that, you can get the same diameter tires for a 16" rim as you can for a 17 or 18" rim.
 
Reply With Quote
  #11  
Old 06-21-2018, 04:17 PM
smoky_diesel's Avatar
smoky_diesel
smoky_diesel is offline
Elder User
Join Date: Sep 2007
Location: Chandler, AZ
Posts: 916
smoky_diesel is a splendid one to beholdsmoky_diesel is a splendid one to beholdsmoky_diesel is a splendid one to beholdsmoky_diesel is a splendid one to beholdsmoky_diesel is a splendid one to beholdsmoky_diesel is a splendid one to behold
Like beer, bigger tires are the cause of and solution to most of life's problems.
 
Reply With Quote
  #12  
Old 06-23-2018, 07:46 AM
Alex from GA
Alex from GA is offline
Posting Guru
Join Date: Oct 2005
Location: Gainesville, GA
Posts: 1,077
Alex from GA is starting off with a positive reputation.
9.50x16.5 tires are 30.3" in diameter and you can put 33" tires on the rear with a rim change. 16" rims and tires are your best bang for the buck. 17
 
Reply With Quote
  #13  
Old 06-24-2018, 04:01 AM
GaryKip's Avatar
GaryKip
GaryKip is offline
Postmaster
Join Date: Aug 2015
Location: Lind, WA- Eastern WA
Posts: 3,039
GaryKip is a splendid one to beholdGaryKip is a splendid one to beholdGaryKip is a splendid one to beholdGaryKip is a splendid one to beholdGaryKip is a splendid one to beholdGaryKip is a splendid one to beholdGaryKip is a splendid one to behold
Originally Posted by 00t444e View Post
Why do you say that, you can get the same diameter tires for a 16" rim as you can for a 17 or 18" rim.
Yes i understand that you can get the same tire HEIGHT in a different rim size, but if you are trying to go with taller tires then most of the time you want a taller rim too. Then the aspect ratio (the 70 or 80 number in the tire size) would be better for handling that way. Then the OP will not have tall but real skinny tires.
 
Reply With Quote
  #14  
Old 06-24-2018, 08:28 AM
00t444e's Avatar
00t444e
00t444e is online now
Elder User
Join Date: May 2017
Location: Southern OH
Posts: 687
00t444e is gaining momentum as a positive member of FTE.
Originally Posted by GaryKip View Post
Yes i understand that you can get the same tire HEIGHT in a different rim size, but if you are trying to go with taller tires then most of the time you want a taller rim too. Then the aspect ratio (the 70 or 80 number in the tire size) would be better for handling that way. Then the OP will not have tall but real skinny tires.
I have 35s on a 16" rim and they handle great. As a rule of thumb I like to have my tire diameter a minimum of twice the rim diameter, and for some odd reason the larger the rim diameter the more expensive the tire is even if they are the same diameter tire.
 
Reply With Quote
  #15  
Old 06-27-2018, 04:28 AM
SoCal69's Avatar
SoCal69
SoCal69 is offline
Freshman User
Thread Starter
Join Date: Jun 2018
Posts: 33
SoCal69 is starting off with a positive reputation.
I should had looked into it before I bought the Firestone transforce there good tires but 16 with 33 " would had been better I agree too that a 17/18 tire is more expensive then a smaller wheel with a big diameter tire the tires that were on it when I bought it, Hercules Hercumile date code 1971 they had 80 percent rubber flat spots all over it sat for years in the guys driveway .
Thanks for all the info I learned something I had a wieght on my flexplate causing a vibration it made 65/70 feel bad put on the right flexplate it wasn't as bad I'm at 3k around 70 /75 2,500 be nice .
 
Reply With Quote

Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.