AusCaRnAgEr

Ok heres the deal.
Recently put in a EL XR6 3.45 'LSD'
It says all over the diff thats its an LSD.
But it does this:

-Tailshaft off - wheels same direction
-Tailshaft on - wheels opposite direction
-Lock one wheel - other wheel spins easily

I understand that with an LSD the wheels should spin the same direction when you spin them. But this diff does both - same and opposite directions in the above different circumstances.
Im pretty sure its an LSD, but could there be something wrong with it -if so what, would this be normal, have i been sold a dudd?

Any help appreciated!

Matt

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1966 Blue Ford Galaxie - 4Dr Sedan, Pwr Steering, 302 Windsor, Edelbrock Performer Intake Manifold, 650 Holley Race Custom , Crow Cam 15666, Rollmaster Camgear, Heads Ported, MSD 6AL Ignition, MSD Billet Dizzy, Crane Energizer Roller Rockers, C4 - Stage 2 Shift Kit, HiStall 2500rpm, B&M Z-Gate Shifter, XY GT Radiator, 2.92 9" Diff, Dual Thermofans, 2.25" Dual Exhaust, RCI 16gal Fuel Cell.

Mike Gayner

Definately doesnt sound like it's an LSD. If you're sure it is, there's an internal problem. I wouldnt try to DIY it unless you have at least some experience working on diffs, but go for it if you think you can do it.

AusCaRnAgEr

Its acting like a open and a LSD, as it spins in the same direction in one example....?

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1966 Blue Ford Galaxie - 4Dr Sedan, Pwr Steering, 302 Windsor, Edelbrock Performer Intake Manifold, 650 Holley Race Custom , Crow Cam 15666, Rollmaster Camgear, Heads Ported, MSD 6AL Ignition, MSD Billet Dizzy, Crane Energizer Roller Rockers, C4 - Stage 2 Shift Kit, HiStall 2500rpm, B&M Z-Gate Shifter, XY GT Radiator, 2.92 9" Diff, Dual Thermofans, 2.25" Dual Exhaust, RCI 16gal Fuel Cell.

Cobra

Find out it it's a 3.45 diff first. The only non LSD from that ratio is the AUII/AUIII XR6 HP diffs. If you can mark the tailshaft and count the turns of rotation of it in relation to the wheels you will find out your ratio. If it isnt a 3.45 diff then youve been jibbed. If it is then it could be the cones in the diff that are rooted.

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Walkinshaw

with no tailshaft there is no resistance agains the diff, hence the LSD action. Definatly sounds like an open diff.

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Ill take it as a complement i think.............

AusCaRnAgEr

yeah its definatly a 3.45.
Walkinshaw if it was a open diff, it would never spin in the same direction on both wheels!
What does it usually cost to replace the cones?

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1966 Blue Ford Galaxie - 4Dr Sedan, Pwr Steering, 302 Windsor, Edelbrock Performer Intake Manifold, 650 Holley Race Custom , Crow Cam 15666, Rollmaster Camgear, Heads Ported, MSD 6AL Ignition, MSD Billet Dizzy, Crane Energizer Roller Rockers, C4 - Stage 2 Shift Kit, HiStall 2500rpm, B&M Z-Gate Shifter, XY GT Radiator, 2.92 9" Diff, Dual Thermofans, 2.25" Dual Exhaust, RCI 16gal Fuel Cell.

TTNOS8

Yes they can. Unloaded is an unfair test.

When buying a diff that is supposedly LS, always check it.

I won't buy an LSD unless I'm satisfied it is. Remove the backing plate even.

Get someone to hold the yoke and one wheel, try and turn the other wheel. Tell us the results.

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AusCaRnAgEr

Well with one wheel jacked up, the other still on the ground:
- In park, the jacked up wheel WONT spin
- In neutral, the jacked wheel Does spin.

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1966 Blue Ford Galaxie - 4Dr Sedan, Pwr Steering, 302 Windsor, Edelbrock Performer Intake Manifold, 650 Holley Race Custom , Crow Cam 15666, Rollmaster Camgear, Heads Ported, MSD 6AL Ignition, MSD Billet Dizzy, Crane Energizer Roller Rockers, C4 - Stage 2 Shift Kit, HiStall 2500rpm, B&M Z-Gate Shifter, XY GT Radiator, 2.92 9" Diff, Dual Thermofans, 2.25" Dual Exhaust, RCI 16gal Fuel Cell.

AusCaRnAgEr

Ok well im pretty convinced the clutches are ****ed, so does any one have an idea on what i would cost to replaces the clutch packs inside the LSD, including labour?

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1966 Blue Ford Galaxie - 4Dr Sedan, Pwr Steering, 302 Windsor, Edelbrock Performer Intake Manifold, 650 Holley Race Custom , Crow Cam 15666, Rollmaster Camgear, Heads Ported, MSD 6AL Ignition, MSD Billet Dizzy, Crane Energizer Roller Rockers, C4 - Stage 2 Shift Kit, HiStall 2500rpm, B&M Z-Gate Shifter, XY GT Radiator, 2.92 9" Diff, Dual Thermofans, 2.25" Dual Exhaust, RCI 16gal Fuel Cell.

TIKFD6

Its pretty comon for teh clutches in the 78 Series Diffs to crap themselves.
You will still have diff action, but you wont have an LSD.