Quote:
Originally Posted by RICK LAKE
Cobra #3107 If you are staying with a Jag rearend, the up grade is to 30 spline from 27. This is with a power locker rearend. CWI sells this upgrade for the Jag rears. I bought the stub axle shafts and rebuilt my own rearend. Mark Williams also sell stub shafts if you tell him what you want. Rumor has it that Williams is the one maken and selling them to CWI after there was a problem with the ones from down under. The stub axles where twisting. Williams builds the 1000hp front shafts for the frontend racers. Complete with his new joints that are better than CV designed ones. The stubs are good for 600hp I am still running the same ones after 11 years of racing. The other thing I will recommend is a rearend support cover. This puts pressure on the carrier caps to stop any kind of walking. They are about $140.00 from LWP. You will need to drill and tap a hole for the breather that was in the old cover. If you don't the pressure from the fluid getting hot will leak or blow out a seal. If you are having a problem with the car going around turns and not freeing up 1 wheel, there is something wrong with the posi unit. The clearances may be too tight in the carrier. The locker is a little clunkey but have not had any hang ups. What weight and fluid are you using in the rearend? Full Synthesis or semi? With the locker I run a full with a lighter weight. With the clutches I run an 80/90 with 2 bottles of additive and run them a little tighter without binding the clutches to engage. I am going to a cooler for the trans and rearend this years to bring down the temps of these to parts. Rick L.
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Rick, Thanks for the info, I am very happy with my stock locker but would like to upgrade the stub axles and spiders to 30 spline. Does Mark Williams make them for a Jag diff with a 4 bolt flange so I can use my stock Half shafts? I put Corvette drag race joints in them (no zerks) and they have held up well. How do I get hold of him, do you have a number. The Detroit soft loc was just to rough in lock and unloc it upset the cars balance every time it cycled so I took it out. I use conventional 80/90 gear
oil with GM friction modifier in my clutch unit and it works fine. The Quaife unit spins the inside tire instead of driving off a corner like it should. Other people have had the same problem. I have been told that the original design did not do this but they are no longer available. Getting the axles seals in the housing on a Jag is a real nightmare but I guess I can do it again if I get 30 spline shafts. I believe the original rear in the car was a 10 spline stub unit but it is so rare I do not use it anymore. The original race cars also ran an
oil cooler so I think that is a good move on your part.