Rear End Ratio?
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Junior User
Joined: Mar 2012
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Rear End Ratio?
I have a new to me 1971 F-100 4x4 with a 360 and what i believe is an np435 mated to a dana21... I dont want to open the axle up to find my rear end ratio. All tags are gona...
Anyone have any idea what my R&P ratio probably is?
Anyone have any idea what my R&P ratio probably is?
Cargo Master
Joined: Feb 2006
Posts: 3,009
Likes: 250
From: North Pole, Alaska
Actually each tire turns at the same speed because the ratios front and rear have to be almost even, say 4.10 to 4.09, or 3.50 to 3.54. If they didn't, your transfer case would be destroyed from the difference in ratios. Also read the warranty tag on the left door, or the warranty sticker on the door pillar under the striker post for the axle code if they haven't been changed.
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
Well, better yet, spin the pinion and count the tire revolutions. Doing it the other way usually ends up spinning in opposite directions and will cause irratic readings(due to differential gears). I'm used to spools and tight limited slips which won't have those issues.
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
If it's an open rear, they will spin on oppposite directions(due to differential) if you spin the tires,. If it does have a limited slip, then it's slipping for some reason(brakes tighter on one side?).
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Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
The right rear & left front are the drive wheels. lock left front hub turn once, count turns of drive line should do it for your ratio count...The rear will be the ssame ratio.
orich
orich
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