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post #1 of 9 (permalink) Old 05-29-03, 05:49 PM Thread Starter
NON TURBO XF....
 
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Diff Question

i'm sure this has been asked a million and one times but the search fuction wouldn't work.

i am building an XF sedan with the X-Flow 6 on PULP:

mild perf. crow cam
crow timing gears/chain/valve train kit
60 thou shaved open chamber head (from XE EFI)
Genie Extractors w/ hi flow cat & straight through muffler (only 1)
re-jetted webber carby
K&N pod filter mounted where battery was.
electric fuel pump
electric water pump
twin thermo fans off XL XR

My question is about the diff and what i should use. the car is mainly for street driving with a few drags now and then of course! i was told to use a 4 pinion LSD with 3.45 gears from a later model XR8 but am curious as to what the hell these mini and full spools are and wether they are a better option or a waste of money for my setup.

any help greatly appreciated


- BLO GMH

-> 1987 XF Fairmont Ghia - Silver, 4.1 EFI, T5, LPG, Clive Cam, Megatork Valve Springs, Crow Pushrods, Crow Timing Gears, Pacemaker Headers, Hi Flow Cat, Mandrel Bent Exhaust, ESA Straight Through Muffler, Grey Velour Interior, Full Electrics, Trip Computer, MOMO Race Wheel, King Spring Super Lows, Monroe GT Gas Shocks, Nolathane Bushes, EL XR8 Rear Axle w/ 3.45 LSD, Snowflakes
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post #2 of 9 (permalink) Old 05-29-03, 06:32 PM
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Street driven? If so stay away from spools. Being a BW diff just get the diff rebuilder to shim up the LSD cones tight and make sure you avoid tight u-turns etc to help prolong LSD component life.

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post #3 of 9 (permalink) Old 05-29-03, 10:10 PM
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mini spools and full spools lock both axles together, thus allowing no differential action to occur.

very good for wheelies and traction.
very bad for turning corners and axles.

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post #4 of 9 (permalink) Old 05-29-03, 10:52 PM Thread Starter
NON TURBO XF....
 
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thanks guys!

so the later model XR LSD is the way to go then.

- BLO GMH

-> 1987 XF Fairmont Ghia - Silver, 4.1 EFI, T5, LPG, Clive Cam, Megatork Valve Springs, Crow Pushrods, Crow Timing Gears, Pacemaker Headers, Hi Flow Cat, Mandrel Bent Exhaust, ESA Straight Through Muffler, Grey Velour Interior, Full Electrics, Trip Computer, MOMO Race Wheel, King Spring Super Lows, Monroe GT Gas Shocks, Nolathane Bushes, EL XR8 Rear Axle w/ 3.45 LSD, Snowflakes
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post #5 of 9 (permalink) Old 05-29-03, 11:11 PM
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just get a 4-pinion lsd out of xe xf etc.

28 spline. disc brake. etc.

then get whatever ratio suits.

All Go, No Show
XE, 351C, Nitrous, 337rwkw
XW GS, Silver Fox, 302W
VS 215i Senator *For Sale*
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post #6 of 9 (permalink) Old 05-29-03, 11:37 PM
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Theres an EL XR8 diff in the trading post for $800 at the moment.

Still available.

Do I really have to write something funny in here?

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post #7 of 9 (permalink) Old 05-29-03, 11:39 PM
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Quote:
Originally posted by TTNOS8
just get a 4-pinion lsd out of xe xf etc.

28 spline. disc brake. etc.

then get whatever ratio suits.
I was told by a few wreckers that pre ed were all 25 spline diffs....can anyone confirm this?
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post #8 of 9 (permalink) Old 05-30-03, 04:42 AM
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Quote:
Originally posted by hot_eb
I was told by a few wreckers that pre ed were all 25 spline diffs....can anyone confirm this?
Post EB (inclusive) are all 28 spline/4pin. Before that, most are 25 spline/2pin, with the exception of 351 equipped vehicles back to XD, and possibly some option packs.

If you're not driving a manual you're really just steering.
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post #9 of 9 (permalink) Old 05-30-03, 04:28 PM
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No.

i'm not 100% with ea, eb, etc. but i'm pretty sure they were all 28 spline.

most xd, xe, xf were 25 spline. don't bother with these.

28 spline were behind 351's and efi 6's and some others but weren't very common.

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XW GS, Silver Fox, 302W
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