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Kernel-K
Bill Kowalewski

(6 posts)

Registered:
08/17/2014 11:04AM

Main British Car:


Salisbury Axle + Quaife LSD (or) Narrowed Ford 8.8 ?
Posted by: Kernel-K
Date: October 11, 2014 02:52AM

Goal: Reliable purely street sleeper MGB + Ford 302 crate engine (target 250-300hp) + LSD + Traction Bars + Dayton Wire Wheel (72 spoke). Do it right the first time...

Option-1: Add Quaife LSD to stock diff
+ Add the Quaife . Done
+ Retain stock suspension
(-) Strength?
(-) Long term reliability?
(-) Gearing - how much an issue ? Not a daily driver.

Option-2: Replace stock axle w/narrowed Ford 8.8 Traction-Lok + suspension mod
+ 100% Ford drivetrain w/out any gearing or strength worries
(-) Stock suspension mods ?

Looks like cost may be a wash between the two options as I will hire someone for axle narrowing

Thoughts?



Edited 1 time(s). Last edit at 10/11/2014 03:02AM by Kernel-K.


Moderator
Curtis Jacobson
Portland Oregon
(4576 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: Salisbury Axle + Quaife LSD (or) Narrowed Ford 8.8 ?
Posted by: Moderator
Date: October 11, 2014 04:40AM

Wire wheels? Really? I don't know anything about putting splined hubs on an 8.8. What's that cost?

Gear ratios are VERY important. IMHO, getting them right is more important than having a limited slip differential. My 8.8 came from the boneyard with 3.27:1 gears, so I didn't pay an extra penny to get the ratio I wanted.

I read somewhere that there are now a couple suppliers of lower-ratio gears for Salisbury axles, but that at least one of them is selling made-in-China junk. You can get any ratio you want for a Ford axle, at an affordable price, and manufactured by a reputable brand-name supplier.

One of these days I'll rip out my 8.8 and install the axle I should have chosen in the first place. I'd strongly prefer an 8" because it's lighter. I'd also strongly prefer disk brakes and coilovers...



Edited 1 time(s). Last edit at 10/11/2014 04:44AM by Moderator.


MGBV8
Carl Floyd
Kingsport, TN
(4511 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Salisbury Axle + Quaife LSD (or) Narrowed Ford 8.8 ?
Posted by: MGBV8
Date: October 11, 2014 10:30AM

I guess I will be the counterpoint. How important can rear gears be? I have been running the stock 3.9 for almost 14 years. :) Once you get to an engine with buckets of torque anything from 3.50 down to something in the high 2s is going to work just fine. 3.20s to 3.50s is probably ideal. Then find a 5th gear you prefer. If I ever change gears it will be to a 3.50 something & my .63 5th gear will be reduced to .73 for less gap between 4th & 5th.

Sort of boils down to whether you are building an Interstate cruiser or a hot rod/muscle car that you are going to punch on occasion.

Also, might want to spend some time playing with a gear ratio/rpm calculator. Make sure that your interstate cruising rpm is still in your cam's happy range. Some cams don't like spending all day below 2000rpm.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6468 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Salisbury Axle + Quaife LSD (or) Narrowed Ford 8.8 ?
Posted by: BlownMGB-V8
Date: October 11, 2014 10:45AM

I still like the Dana 44 for cars in that power range. Good bit stronger than the 8".

Jim


Moderator
Curtis Jacobson
Portland Oregon
(4576 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: Salisbury Axle + Quaife LSD (or) Narrowed Ford 8.8 ?
Posted by: Moderator
Date: October 11, 2014 12:12PM

Dan Masters' Gear Ratio Calculator


mgb260
Jim Nichols
Sequim,WA
(2461 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Salisbury Axle + Quaife LSD (or) Narrowed Ford 8.8 ?
Posted by: mgb260
Date: October 11, 2014 02:34PM

Basil has the good German 3.07 and 3.31 gears for the stock rear. Glenn Towery has the stainless thrust washers to replace the copper and fiber ones for anti clunk. There is a newer clutch type posi available for the stock rear also. Cheaper than Quaiffe. The 8.8 and Dana 44 are about equal and if over 300HP, a good idea. The stock MGB, 7.5 Ford, GM S10/Camaro and Toyota rears are fine for V6 and 215 V8 under 250HP.



Edited 1 time(s). Last edit at 10/11/2014 04:49PM by mgb260.


mgb260
Jim Nichols
Sequim,WA
(2461 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Salisbury Axle + Quaife LSD (or) Narrowed Ford 8.8 ?
Posted by: mgb260
Date: October 11, 2014 03:34PM

Link to MGB posi, still not as cheap as American axle units: [www.ebay.com]



BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6468 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Salisbury Axle + Quaife LSD (or) Narrowed Ford 8.8 ?
Posted by: BlownMGB-V8
Date: October 12, 2014 10:15AM

Also the 8" takes about a 5% hit in efficiency due to the high helix angle.

Jim


MGBV8
Carl Floyd
Kingsport, TN
(4511 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Salisbury Axle + Quaife LSD (or) Narrowed Ford 8.8 ?
Posted by: MGBV8
Date: October 12, 2014 02:35PM

That posi isn't much cheaper than a Quaiffe!

Would that be 5% more than the stock B, or just 5% total parasitic loss?


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6468 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Salisbury Axle + Quaife LSD (or) Narrowed Ford 8.8 ?
Posted by: BlownMGB-V8
Date: October 12, 2014 07:34PM

"Another difference between the two rearends is that the 9-inch locates its pinion gear lower on the ring gear to improve tooth contact. This strengthens the rearend assembly but at the cost of approximately 2 to 3 percent loss of power to drive the gears compared to a 12-bolt."

Read more: [www.superchevy.com]

It's on the Internet, must be right. Right?

Jim


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