Needy RearEnd??????
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Needy RearEnd??????
I just got a F100 1965 a couple wks ago/ going down the hwy at 70 mph seems to me the 352 engine is running a litte hard. How hard is it to change out a gear in the rear end or change the rear end out completely / I believe the current rearend is a 37something/ not completely forsure/ what gear ratio would you'll recommend/ the truck sounds really good at 55 to 60 mph on the hwy. Thanks for all your help and responses with the needy rearend/ Kevin Felix
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From: Simi Valley, CA
I just got a F100 1965 a couple wks ago/ going down the hwy at 70 mph seems to me the 352 engine is running a litte hard. How hard is it to change out a gear in the rear end or change the rear end out completely / I believe the current rearend is a 37something/ not completely forsure/ what gear ratio would you'll recommend/ the truck sounds really good at 55 to 60 mph on the hwy. Thanks for all your help and responses with the needy rearend/ Kevin Felix
Do not assume your truck has a 9 inch rear axle, it could be a Dana 44 or a Dana 60.2 as Ford offered both for F100's as an option.
If it is a 9" swapping gears is EZ, if it's not...that's another story.
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From: Creedmoor, North Carolina
Good info posted by Bill, problem is that info will only tell you how it left the factory. Your truck may or may not have that same rear end today.
You might want to give it a test roll to see actual ratio. A level garage floor is best, but any level surface can be used. With someone else there, mark one of the rear tires center bottom, and a lined up mark on the ds at the rear gear.
Rotate the tire one complete revolution and count the times the mark on the ds passes your rear gear mark. That will give you the actual ratio.
Then you might have a better idea if it had been changed out or is original.
John
You might want to give it a test roll to see actual ratio. A level garage floor is best, but any level surface can be used. With someone else there, mark one of the rear tires center bottom, and a lined up mark on the ds at the rear gear.
Rotate the tire one complete revolution and count the times the mark on the ds passes your rear gear mark. That will give you the actual ratio.
Then you might have a better idea if it had been changed out or is original.
John
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From: Moyie, BC Canada
Good info posted by Bill, problem is that info will only tell you how it left the factory. Your truck may or may not have that same rear end today.
You might want to give it a test roll to see actual ratio. A level garage floor is best, but any level surface can be used. With someone else there, mark one of the rear tires center bottom, and a lined up mark on the ds at the rear gear.
Rotate the tire one complete revolution and count the times the mark on the ds passes your rear gear mark. That will give you the actual ratio.
Then you might have a better idea if it had been changed out or is original.
John
You might want to give it a test roll to see actual ratio. A level garage floor is best, but any level surface can be used. With someone else there, mark one of the rear tires center bottom, and a lined up mark on the ds at the rear gear.
Rotate the tire one complete revolution and count the times the mark on the ds passes your rear gear mark. That will give you the actual ratio.
Then you might have a better idea if it had been changed out or is original.
John
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From: Creedmoor, North Carolina
John
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needy rearend
John thanks/ Bill thanks /I'm going to check the rearend this afternoon with the rotation method/Then I'll check back with both of you. Hopefully the next step (after the rotation check) will be inexpensive and a simple solution/ Thanks guys for all your help, could not do this stuff without knowledge of guys like the both of you/Thanks again in advance/ Kevin Felix
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Ok guys I did as told to do/ the numbers the tag on the drivers door for the axle is 07
The tire rotation one complete rotation of the wheel and tire to apx. 1 5/8 rotation of
the drive shaft
The tag on the axle housing I believe reads something like this (do not know if this will be any help or not) 1DH-E1
3 255CE 313
This is about all I know to do, can you'll tell me anything else Bill or John about what type rearend it has and what would be the answer to make it run less RPM'S at 70mph or so. Thanks in advance for all your help.
Kevin Felix
The tire rotation one complete rotation of the wheel and tire to apx. 1 5/8 rotation of
the drive shaft
The tag on the axle housing I believe reads something like this (do not know if this will be any help or not) 1DH-E1
3 255CE 313
This is about all I know to do, can you'll tell me anything else Bill or John about what type rearend it has and what would be the answer to make it run less RPM'S at 70mph or so. Thanks in advance for all your help.
Kevin Felix
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From: Simi Valley, CA
07 = Ford 9" Rear Axle / 3.25-1 / non Limited Slip / 3300 lb. Rear Axle Capacity.
There's no such axle tag number of IDH-E1 3255CE 313.
With an 07 AXLE code, the tag should read: WDM-A / 3.25 / C5E = Assembled the 5th week (E) of March (C) 1965 (5).
31 is the assembly plant code / 5 (EDIT: 3) is the design change.
There's no such axle tag number of IDH-E1 3255CE 313.
With an 07 AXLE code, the tag should read: WDM-A / 3.25 / C5E = Assembled the 5th week (E) of March (C) 1965 (5).
31 is the assembly plant code / 5 (EDIT: 3) is the design change.
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Bill is there another gear that can be change and if so what would I need to get to make the rearend a little higher so the engine sounds like it is not running so hard (less rpm's).
The tag must read as you quoted, I could not read it very clearly.
Thanks again for all your help
The tag must read as you quoted, I could not read it very clearly.
Thanks again for all your help
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
What John said is spot on...because after 45 years, who knows if the ratio has been changed...or not.
3.25-1 is an ideal ratio for these trucks. Ford didn't offer anything lower (3.00-1 & 2.75-1) for F100's until several years later.
These can be swapped in, but unless you drive mostly on highways/freeways/turnpikes, I wouldn't bother, because in city driving, these "high speed" ratios can be a detrimate.
In 1981, I swapped in 3.00-1's into my (purchased new, but now former) '65 F100, which had overdrive. But after 1981, the truck was used only on weekends, usually as a "chase vehicle" in Route 66 Rod Runs.
3.25-1 is an ideal ratio for these trucks. Ford didn't offer anything lower (3.00-1 & 2.75-1) for F100's until several years later.
These can be swapped in, but unless you drive mostly on highways/freeways/turnpikes, I wouldn't bother, because in city driving, these "high speed" ratios can be a detrimate.
In 1981, I swapped in 3.00-1's into my (purchased new, but now former) '65 F100, which had overdrive. But after 1981, the truck was used only on weekends, usually as a "chase vehicle" in Route 66 Rod Runs.
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When I jacked the truck up and turned the wheel/tire one complete rotation and the drive shaft apx 1 5/8 rotation. Does this sound like it is a 3:25. I guess the old truck just isn't as quit as the newer ones and it just sounds if it is running a little hard doen the hwy. Thanks for all your responses again. Kevin Felix
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07 = Ford 9" Rear Axle / 3.25-1 / non Limited Slip / 3300 lb. Rear Axle Capacity.
There's no such axle tag number of IDH-E1 3255CE 313.
With an 07 AXLE code, the tag should read: WDM-A / 3.25 / C5E = Assembled the 5th week (E) of March (C) 1965 (5).
31 is the assembly plant code / 5 is the design change.
There's no such axle tag number of IDH-E1 3255CE 313.
With an 07 AXLE code, the tag should read: WDM-A / 3.25 / C5E = Assembled the 5th week (E) of March (C) 1965 (5).
31 is the assembly plant code / 5 is the design change.
He did rotate the rear tire but, as I recall if both tires turn when you do this, you will get a false, half reading. So, his reported 1 5/8 ratio x 2 = 3.25 ratio, which is a match.
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Thanks for all your valuable information, you'll make life so much simpler. I'm really glad that I found this forum. Without such knowledgable people like you'll I would had to taken my truck to a shop and payed them to tell me the same information that you'll did. Thanks again and may God bless every one you. Kevin Felix