My RearEnd
Junior User
Joined: Mar 2002
Posts: 62
Likes: 0
From: USA
My RearEnd
Yes. I was wondering if anyone could tell me the Ratio of my rearend. I have a 79' F100 2wd that came with a 300 straight6. I was wondering if someone could tell me the gears and the size, like 8.8 or 9inch. I am putting a 351 H.O out of a 86 van and was wondering the actual difference in the gearing. Could anyone tell me the gearing of the van also. It is a 86' E-150. The 300 had a C4 but I am bolting a C6 with the 351. Any help or advice would be greatly appreciated. thank you
Freshman User
Joined: Oct 2001
Posts: 33
Likes: 0
From: Newport USA
My RearEnd
The easiest way to find out what ratio you have in your rearend is to, (this will take two people). Jack one of the rear tires off the ground. Rotate this elevated tire one complete turn, while counting how many times the yoke turns. This will tell you your ratio.
Me_Bad_Dog(No Email Addresses In Posts!)
74 F-250 4X4
In process of rebuilding
460cid
np435
np205 devorced
looking for dana 60 open knockle front
Me_Bad_Dog(No Email Addresses In Posts!)
74 F-250 4X4
In process of rebuilding
460cid
np435
np205 devorced
looking for dana 60 open knockle front
Post Fiend
Joined: Apr 2002
Posts: 5,964
Likes: 1
From: Woodruff, SC
My RearEnd
If you look in the door jam on the drivers side there will be a plate with the info you need there is a axle code with numbers and or letters below it let me know what they are and i can find out what you have
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
My RearEnd
To determine the type and ratio of the rear end on a vehicle that old you should probably check the ID tag on the diff itself. Hopefully the tag is still there. The rear axle or diff may have been changed.
When you jack up one rear wheel and turn it (correct me if I'm wrong) you have to turn it two complete revolutions and count the number of turns of the yoke because of the differential. This won't work with a spool and some types of locking diff's. Check in the
[link:www.ford-trucks.com/cgi-bin/dcforum/dcboard.cgi?az=list&forum=DCForumID27&conf=misc|Tr ansmission, Differential, Axle and Transfer Case]
Forum for more/better info.
[link:www.ford-trucks.com/guidelines.html|FTE Moderator]
over!
When you jack up one rear wheel and turn it (correct me if I'm wrong) you have to turn it two complete revolutions and count the number of turns of the yoke because of the differential. This won't work with a spool and some types of locking diff's. Check in the
[link:www.ford-trucks.com/cgi-bin/dcforum/dcboard.cgi?az=list&forum=DCForumID27&conf=misc|Tr ansmission, Differential, Axle and Transfer Case]
Forum for more/better info.
[link:www.ford-trucks.com/guidelines.html|FTE Moderator]
over!
Freshman User
Joined: Nov 2000
Posts: 43
Likes: 0
From: Rohnert Park USA
My RearEnd
Hi guys, quick question??
The code for the rear axle on my truck says "36 J"
Is this the Dana 70 w/3.73 ratio? What does the "J" stand for?
Thanks
The code for the rear axle on my truck says "36 J"
Is this the Dana 70 w/3.73 ratio? What does the "J" stand for?
Thanks
Trending Topics
Post Fiend
Joined: Apr 2002
Posts: 5,964
Likes: 1
From: Woodruff, SC
My RearEnd
>Hi guys, quick question??
>
>The code for the rear axle on my truck says "36 J"
>
>Is this the Dana 70 w/3.73 ratio? What does the "J" stand
>for?
>Thanks
Power steering
>
>The code for the rear axle on my truck says "36 J"
>
>Is this the Dana 70 w/3.73 ratio? What does the "J" stand
>for?
>Thanks
Power steering
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
New User
Joined: Jan 2008
Posts: 0
Likes: 24
My RearEnd
And yes you are correct on the axle
Dana 70 > 3.73:1
[b][i][font color=red]Dennis[/font][i][b]
[font color=red]Calgary,Alberta,Canada[/font]
http://www.clubfte.com/users/mil1ion/Minimorleytruck.JPG
[font color=green] Truck Data Plate Info
[/font
http://www.clubfte.com/users/mil1ion/FordTruckCodes.html
[font color=red]If New Ford Parts Is What You're Cravin',
Then Buy Them HERE,At Motorhaven![/font]
http://www.clubfte.com/users/mil1ion/Mil1ion.html
[font color=red]
Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [/font]
[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
[/font]
Dana 70 > 3.73:1
[b][i][font color=red]Dennis[/font][i][b]
[font color=red]Calgary,Alberta,Canada[/font]
http://www.clubfte.com/users/mil1ion/Minimorleytruck.JPG
[font color=green] Truck Data Plate Info
[/font
http://www.clubfte.com/users/mil1ion/FordTruckCodes.html
[font color=red]If New Ford Parts Is What You're Cravin',
Then Buy Them HERE,At Motorhaven![/font]
http://www.clubfte.com/users/mil1ion/Mil1ion.html
[font color=red]
Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [/font]
[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
[/font]
Senior User
Joined: Jun 1999
Posts: 265
Likes: 0
From: Greenville USA
My RearEnd
Mr. Dogg's procedure will work for the ratio, but you have to spin the tire TWO complete revolutions while counting the number of times the yoke spins over. This is because both tires have to make one complete revolution for the yoke to spin over once. Any proportion between the two will do, such as 1 spin of each tire, 1.5 of one and .5 of another, or the easiest to do of all: 2 complete revolutions of one wheel while holding the other stationary.
fordmando
70 F-100 460 C6
78 F-150 4x4 400 NP435
George Selby
fordmando
70 F-100 460 C6
78 F-150 4x4 400 NP435
George Selby
