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post #1 of 8 (permalink) Old 07-07-04, 10:30 PM Thread Starter
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Changing diff ratio's.

When changing diff ratio in a XF do u have to replace the housing or can the new centre go into the old housing , Also if the housings don't have to be changed will the centre out of an E series fit an XF housing.

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post #2 of 8 (permalink) Old 07-08-04, 05:15 PM
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Re: Changing diff ratio's.

just ring gear and pinion needs top be changed. and you can install xe to eb1 25 spline centres..
just to be sure xe351 used a 28 spline diff.. i know all xf's are 6cyl and 25spl but i would check to make sure it hasnt been changed b4

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post #3 of 8 (permalink) Old 07-08-04, 06:05 PM Thread Starter
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Re: Changing diff ratio's.

sorry for my ignorance gtcoupe95 but what do you mean by top be changed? The diff in mine was from a xf fairmont with 2.77 and be wanting to throw a 3.08 or 3.23 into it would prefer 3.08 or would it just be easier to put in a e series diff and housing.
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post #4 of 8 (permalink) Old 07-09-04, 02:49 AM
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Re: Changing diff ratio's.

Because of the offset of the 2.77 XF LSD - you cannot change ratio's... Some carbied XF's came with 2.92 o/w which will take the "Normal" LSD centre which will accept any of the BW 78 ratios from 2.92 to 4.11. You could always use a 2.92 LSD from a ZK and change gears on that.
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post #5 of 8 (permalink) Old 07-09-04, 07:19 PM Thread Starter
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Re: Changing diff ratio's.

do lsd diff's use bigger bearings or was it the offset as i try'd to put a 3.23 into the housing a week ago and when i torque'd it up the centre would not turn so put the 2.77 back in and was ok. Thought it was something i was doin wrong or that u couldn't change ratio's without changing the housing hence this thread
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post #6 of 8 (permalink) Old 07-10-04, 12:39 AM
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Re: Changing diff ratio's.

Quote:
Originally Posted by xf351clev
do lsd diff's use bigger bearings or was it the offset as i try'd to put a 3.23 into the housing a week ago and when i torque'd it up the centre would not turn so put the 2.77 back in and was ok. Thought it was something i was doin wrong or that u couldn't change ratio's without changing the housing hence this thread
No - it is the physical size and offset of the 2.77 LSD which makes it different to everything else and therefore useless to most of us...To change ratio's you will need to go back to a ZK/FD 2.92 LSD housing and centre.
Shane
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2. If you throw it up in the air and it comes down - It's too heavy...

My Toys:
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post #7 of 8 (permalink) Old 07-11-04, 06:04 AM Thread Starter
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Re: Changing diff ratio's.

do all ZK's have lsd or are some ss as priced one from a local wreckers for $150 minus brakes but will use mine anyway as there slotted.
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post #8 of 8 (permalink) Old 07-12-04, 02:17 AM
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Re: Changing diff ratio's.

Back in the good old days - all Ford V8's came with LSD's. If the ZK was a V8 one it will have an LSD tag on the cover plate. Make them prove to you it is an LSD centre before you purchase it.
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My Toys:
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Squeezed is nice, stroked is good, blown is unbeliveable - but all 3 is heaven
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