Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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88v8
Ivor Duarte
Gloucestershire UK
(819 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: Jag IRS, Dana Unit Questions?
Posted by: 88v8
Date: December 12, 2020 04:40AM

I'd no idea their life was so short.
And presumably the wear particles find their way into the bearings.

A viscous lsd like the Nissan R200 that can be fitted to the TR6, seems a better idea. Pity they're not more available.

Ivor


MGBV8
Carl Floyd
Kingsport, TN
(4014 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB, Buick 215

authors avatar
Re: Jag IRS, Dana Unit Questions?
Posted by: MGBV8
Date: December 12, 2020 09:30AM

"And presumably the wear particles find their way into the bearings."

That would mainly just be the clutch friction material.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5985 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Jag IRS, Dana Unit Questions?
Posted by: BlownMGB-V8
Date: December 12, 2020 11:24AM

The wear particles don't seem to be a problem, apparently they are small enough and fall to the bottom or get minced by the gears. Personally I like the Power-Lok instead for a number of reasons. Having all steel clutches, they last longer. Having ramps on the cross pin ends they are less dependent on the cup springs to apply, they are easier to assemble, and have twice the number of spider gears. But they do wear also, just not as fast. They can also be heavily preloaded if desired. Of the entire spectrum of less expensive posi units they are probably the best, although some drivers would prefer the Detroit Locker. Moving up in price of course you have your gear type, viscous, and of course on-demand electric or air lockers. The gear type were once considered THE thing but that was before everyone realized that they can't ever transfer 100% torque to the driving wheel. Every design has limitations, you just have to pick the ones you can live with and afford. I'm not sure exactly what the limitations of the viscous ones are, not having driven one, but I suspect heat, and less that 100% load transfer.

Jim


soi6
Tim east

(31 posts)

Registered:
06/24/2018 06:40PM

Main British Car:


Re: Jag IRS, Dana Unit Questions?
Posted by: soi6
Date: December 12, 2020 05:25PM

Now having rebuilt this, I can see its not such a big deal to leave the axle in the car & pop out the carrier to replace the plates when its time.

This Dana diff has a 2.88:1 ratio, I do have a salsbury Power Lock unit with a 3.7:1 ratio in as new condition in my spares stash, maybe use that if this 2.88 is not a good match later on.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5985 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Jag IRS, Dana Unit Questions?
Posted by: BlownMGB-V8
Date: December 13, 2020 01:55AM

May want to look for a set of gears around 3.31, I think that will fit the 3.71 carrier but check. Look for a set of original Dana gears as they are harder and will wear longer.

Jim


soi6
Tim east

(31 posts)

Registered:
06/24/2018 06:40PM

Main British Car:


Re: Jag IRS, Dana Unit Questions?
Posted by: soi6
Date: December 15, 2020 05:20PM

Ok I note your comments, Jim is your MG at stock ride height? Im ready to set my diff in the car & see your build. Thanks


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5985 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Jag IRS, Dana Unit Questions?
Posted by: BlownMGB-V8
Date: December 16, 2020 11:56AM

Tim, I'm not sure which means probably not. I went to some trouble to be able to make the half-shafts the limiting factor rather than the upright bells and to preserve maximum suspension travel. It probably sits about at stock height or maybe a little lower but of course it's also 6" wider.

Jim.



MGBV8
Carl Floyd
Kingsport, TN
(4014 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB, Buick 215

authors avatar
Re: Jag IRS, Dana Unit Questions?
Posted by: MGBV8
Date: December 17, 2020 10:15AM

Shame that the How It Was Done page is so behind on Jim's updates to his car.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5985 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Jag IRS, Dana Unit Questions?
Posted by: BlownMGB-V8
Date: December 17, 2020 11:55AM

There is some info in the 340 thread and the roadmaster thread though.

I could submit an updated HIWD but would it ever get posted?

Jim


soi6
Tim east

(31 posts)

Registered:
06/24/2018 06:40PM

Main British Car:


Re: Jag IRS, Dana Unit Questions?
Posted by: soi6
Date: December 17, 2020 06:32PM

Jim, Ive seen MG's with jag axles but never looked too close, are you saying with keeping the stock track I'll have to limit the suspension movement?


ex-tyke
Graham Creswick
Chatham, Ontario, Canada
(1127 posts)

Registered:
10/25/2007 11:17AM

Main British Car:
1976 MGB Ford 302

authors avatar
Re: Jag IRS, Dana Unit Questions?
Posted by: ex-tyke
Date: December 18, 2020 08:24AM

Quote:
I could submit an updated HIWD but would it ever get posted?
I submitted updated HIWD info to Curtis over 2 years ago and still no activity..... suppose that PACCAR is keeping him pretty busy these days.
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