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9Likes
05-02-2011, 03:39 AM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Not Ranked
Many thanks Paul. Did you find a difference in the action? Which oil is recommended. Thought I would fill it before installing it. Much easier.
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Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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05-02-2011, 03:52 AM
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CC Member
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Join Date: Jan 2007
Location: Melbourne,
VIC
Cobra Make, Engine: Harrison, 6.0L Chev
Posts: 2,513
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Merv, I didn't drive it with the R33 centre, sorry. In my S15 it hooked up nicely but wasn't dealing with big V8 torque. Apparently in the Nissan S15 service manual it says, "use API GL-5 : Never use LSD exclusive gear oil. Use standard differential oil." I've read similar comments in many places. I believe the viscous LSD oil contains modifiers to deal with the clutch packs and this is not needed in the mechanical LSD.
Edit: I let a bit of the oil out of mine and it looked and smelled OK so I haven't changed it.
Last edited by sambo; 05-02-2011 at 03:54 AM..
Reason: .
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05-02-2011, 04:44 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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A bit more info from a Nissan rear end specialist. He advises that the halfshafts/flanges from the R33 (4.1) will fit on to the splines of new diff (3.5 viscous) but that they are off-set, with the LHS being shorter and the RHS longer. Thus the existing axles won't fit! So I will need to get the axles that go with the new R33 DE (3.5) diff. That should do it.
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Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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05-02-2011, 06:41 PM
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CC Member
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Join Date: May 2002
Location: Brisbane Australia,
QLD
Cobra Make, Engine: RMC under re-construction, GenIV with tremec 600, Jag 3.31 L/S diff
Posts: 3,318
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Hey Guys, What is the offset of the pinion to the right hand side on those Nissan diffs?.
Thanks in advance.
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05-02-2011, 10:13 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Not Ranked
Les, Paul and Warren - I have just measured the width of the two differentials and they are almost the same at 317-316 from axle flange to axle flange (tiny bit of parallax in there). The flanges themselves on the both sides of both diffs are the same (!) at 50mm. Looking better than the above concern. Both are R33 so that should not be a surprise maybe.
Merv
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Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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05-02-2011, 10:23 PM
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CC Member
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Join Date: May 2002
Location: Brisbane Australia,
QLD
Cobra Make, Engine: RMC under re-construction, GenIV with tremec 600, Jag 3.31 L/S diff
Posts: 3,318
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Thanks Merv, but whats the difference between the pinion center line and to each axle flange.
The pinions are off center and I'm interested what that offset is.
Thanks again.
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It's impossible to soar like an eagle when you're surrounded by turkeys.
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05-03-2011, 12:31 AM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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I am not sure Les as I haven't pulled the back plate and measured differences, but they will be different. My initial joy that the flange to flange measurements were the same on both diffs was lost when I pulled out the flange shafts from both diffs. The old one (both RHS) was longer in the diff (see pics; old one on top and new one below) and new one shorter. I assume that will be the reverse for the LHS ones. So it seems I will need to get new axle shafts that have a 6 bolt pattern - that is using the drive flanges that came with the new diff - and that are the same length as my existing ones! Damn! Spline counts are the same.
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Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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05-03-2011, 04:49 AM
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CC Member
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Join Date: May 2002
Location: Brisbane Australia,
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Cobra Make, Engine: RMC under re-construction, GenIV with tremec 600, Jag 3.31 L/S diff
Posts: 3,318
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Quote:
Originally Posted by Merv and Sharon
I am not sure Les as I haven't pulled the back plate and measured differences,
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Oops, maybe I didn't explain myself properly.
No need to pull the back plate Merv, see below:
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It's impossible to soar like an eagle when you're surrounded by turkeys.
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05-03-2011, 02:42 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
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Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
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OK Les will check it tonite.
Merv
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Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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05-04-2011, 11:28 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
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Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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It is 19 and 13 cm Les. Paul still trying to confirm oil type. Hypoid diff synthetic and LSD say the specs at the service centre. I thought you used non LSD?
Merv
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Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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05-04-2011, 11:35 PM
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CC Member
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Join Date: Mar 2008
Location: Gold Coast,
QLD
Cobra Make, Engine: Harrison #69, HSV LS2, T56, Custom rear suspension
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In my old Datsun rally car with a R200 LSD diff we used Amsoil.
Cheers
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Geoff
Cobra Car Club of Qld - UAE Chapter
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05-04-2011, 11:49 PM
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Join Date: Jan 2007
Location: Melbourne,
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Cobra Make, Engine: Harrison, 6.0L Chev
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Merv for the helical (non viscous) diff you want plain old 90 weight diff oil. The fancy stuff goes in the viscous diffs to deal with clutch packs - that's my conclusion after lots of reading. I'll confirm with Nissan before changing mine just to be sure.
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05-05-2011, 12:04 AM
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CC Member
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Join Date: Jan 2007
Location: Melbourne,
VIC
Cobra Make, Engine: Harrison, 6.0L Chev
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Sorry double post
Last edited by sambo; 05-05-2011 at 05:35 AM..
Reason: double post
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05-05-2011, 12:09 AM
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CC Member
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Join Date: May 2002
Location: Brisbane Australia,
QLD
Cobra Make, Engine: RMC under re-construction, GenIV with tremec 600, Jag 3.31 L/S diff
Posts: 3,318
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Not Ranked
Quote:
Originally Posted by Merv and Sharon
It is 19 and 13 cm Les.
Merv
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Merv, thanks heaps.
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It's impossible to soar like an eagle when you're surrounded by turkeys.
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05-05-2011, 12:20 AM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Thanks Paul. Is that non LSD? seems odd.
__________________
Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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05-05-2011, 05:37 AM
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CC Member
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Join Date: Jan 2007
Location: Melbourne,
VIC
Cobra Make, Engine: Harrison, 6.0L Chev
Posts: 2,513
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Not quite sure what you mean Merv. Viscous and helical are both limited slip.
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05-05-2011, 02:18 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
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Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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Thanks Paul. Just checking. Should get time to install diff Sunday. New axles are in. Ally bushes should come today.
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Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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05-07-2011, 10:35 PM
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CC Member
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Join Date: Jun 2007
Location: Sunshine Coast Qld,
QLD
Cobra Make, Engine: Harrison # 80; Ford 5.0L HO Trickflow heads, cam and rockers and MassFlow EFI
Posts: 3,482
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All done! Took longer than I thought, but lying on the garage floor with the car on axle stands is a real test. Thanks to Scott I have a (less usual) Nissan 3.55 R33 diff and drive shafts. Thanks also to Warren and Paul for putting up with my repetitive questions. The new diff had exactly the same outer dimensions as my original R33 so the drive shaft fits perfectly and all the mounting bolts aligned easily. Used the ally bushes on the front of the diff and poly ones on the rear. Raising a big diff under a car and bolting it in, is awkward work.
Drives very differently now, with ability to rev out more through the gears and first, second and third are more useable. It really transforms the drive of the car. I may need to re-calibrate/check my speedo now however.
__________________
Merv
Ford Cobra
Harrison #80.
Peregian Beach
Sunshine Coast Qld.
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05-07-2011, 11:49 PM
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CC Member
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Join Date: Sep 2006
Location: Bundaberg, Queensland,
QLD
Cobra Make, Engine: Harrison #73 with an L76 6 litre CHEV, T56, 6SPEED,R32 Rear end.
Posts: 470
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New diff
Merv,
sounds like a rewarding afternoon
Mick
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Schipps
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05-08-2011, 12:37 AM
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CC Member
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Join Date: Jul 2009
Location: Redland Bay,
QLD
Cobra Make, Engine: Harrison #100 under construction
Posts: 1,109
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Good job Merv, heavy little suckers them diffs eh!
Glad to hear that the change is worth while & yes you will ahve to re calibrate the speedo if you want more accuracy, especially these days with the "flash for Cash" safety (!??!) devices that are around these days.
Rog
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Rog 246
Harrison #100
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