Rear Diff Fill Question

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May 19, 2002 | 03:18 PM

Pastmaster

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Joined: Jun 1999

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From: Lee's Summit MO

Rear Diff Fill Question

I just changed the rear fluid on a 97 F-250 with the Sterling axle. Had no problem filling fluid with the fill/check hole. I tried to do the same on my 1993 F-150, except I could NOT get the fill/check bolt out. I filled the diff 2.75qts through the VSS hole. None of the fluid has leaked out on the ground, so I know it's somewhere in the diff. Am I okay using this method?

'93 F-150 loaded and modified!
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May 20, 2002 | 11:52 AM

Ratsmoker

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From: Missouri

Rear Diff Fill Question

I bet this is one of those times you wish you had tried to pull the plug before removing the cover right?

If you have a good way to measure the amount of fluid going in and you are 100% sure of the capacity then it should be no problem. I have seen people fill trannies from the drain plug hole at the lube rack before when they couldn't get the fill plug out. This is something I would not recommend though.

May 20, 2002 | 12:25 PM

AZ4x4f150

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Joined: Jul 2001

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From: Glendale USA

Rear Diff Fill Question

you can get away with filling thru the vent tibe hole but make sure you know it is full and alot of times it will be a very slow process cuz the air needs to escapre while filling since you are filling thru the vent tube

May 20, 2002 | 08:40 PM

Pastmaster

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From: Lee's Summit MO

Rear Diff Fill Question

Guys, My Haynes manual lists 2.75qts full on the 8.8" axle. I used 2 3/4 bottles of the fluid. I hope I'm at least darn close to the level.

Yeah, the fluid was still gold. If I knew I was going to go through this, I wouldn't have touched it. Oh well! Live and Learn! I appreciate the opinions!

'93 F-150 loaded and modified!
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May 20, 2002 | 09:41 PM

brown 4x4

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From: Nebraska

Rear Diff Fill Question

[updated:LAST EDITED ON 20-May-02 AT 10:42 PM (EST)]Quick question: when you take off the rear cover to drain it, there's a gasket there that needs to be replaced, correct?

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[font color="green"]1995 F-150 Supercab XLT longbed 4x4 302 M5OD [/font]31x10.50's
[font color="green"]1986 F-150 4x4 300 I6 NP435 [/font]Warn hubs, DeeZee bed caps, '96 XLT bench seat, new paint job

May 21, 2002 | 12:49 AM

Ratsmoker

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From: Missouri

Rear Diff Fill Question

Most people I know use RTV instead of a gasket but yes something of the sort is needed.

May 21, 2002 | 11:47 AM

rabidranger

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Rear Diff Fill Question

[updated:LAST EDITED ON 21-May-02 AT 12:48 PM (EST)]Uhhh, if your book said 2.75 quarts for the 8.8 than you are going to need ALOT more for the sterling 10.25!!! I am thinking more like 4-5 quarts! Especially if it is a full-float, cuz the outer bearings are lubed by the diff oil.

edit:

my bad, I thought you were having trouble with your F250, not the F150. Nevermind....