Decoding f-250 diff.

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May 25, 2013 | 02:31 PM

SEH43

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Joined: May 2013

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From: Salem, OR

Decoding f-250 diff.

Hi I'm new so be nice.
I just bought an 86 F250, 6.9L, c6, 3.55:1 ratio, full floating axle. The cert sticker on the door post is unreadable, so how do I dine the axle capacity?
It has a 12 bolt cover and the tag reads:
Top line: V127A
Lower line: 55 10 2 6B20

Any help is appreciated.

Steve

May 25, 2013 | 02:40 PM

ArdWrknTrk

pedant

Joined: Jan 2008

Posts: 23,576

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From: EXTREME southwest CT

You have a 3.55 ratio Sterling (Ford) 10.25" rear.

About 3 1/2 quarts of 80/90 GL5 gear oil.
There is no 'L' in the bottom line before '.55', so you don't need additive.

May 25, 2013 | 02:48 PM

SEH43

Thread Starter

Senior User

Joined: May 2013

Posts: 286

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From: Salem, OR

Decoding F250 diff

Thanks for the e mediator reply.
Can you tell from these no. What the gross axle capacity is?

May 25, 2013 | 03:02 PM

ArdWrknTrk

pedant

Joined: Jan 2008

Posts: 23,576

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From: EXTREME southwest CT

Sorry, I misunderstood. I thought you meant fluid capacity.

That would depend on the springs and length of chassis.
You say you can't read the door tag, but the one in my truck says (rear) GAWR 6084 Lbs

May 25, 2013 | 03:08 PM

ArdWrknTrk

pedant

Joined: Jan 2008

Posts: 23,576

Likes: 38

From: EXTREME southwest CT

'6B20' is built on Feb 20th 1986
'V127A' is a 3.55 10.25" for an f-250&350 pickup.
BUT it also says it is limited slip!

Perhaps the '3L' portion of the stamp is under the nut holding it on.

http://www.fordification.com/tech/rearends_ford17.htm

http://www.foureyedpride.com/joom/in...d=24&Itemid=40

Last edited by ArdWrknTrk; May 25, 2013 at 03:12 PM. Reason: add links