MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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MGB-SBC-Jimmy
Jimmy Geske

(35 posts)

Registered:
01/27/2011 08:02AM

Main British Car:
Source for rear gear sets for 78 mgb?.............
Posted by: MGB-SBC-Jimmy
Date: November 06, 2012 03:22PM

I have a 1978 MGB that I dropped in a SBC with a 3speed manual. I kept the original rear axle and I really need to drop the rpms down at highway speed. Is there anywhere to find new ring and pinions in the 3.07:1 ratio or should I be looking for a used set? I hope I can change the gears without too much trouble, and I was wondering what other parts I would need to do this gear swap. Do these rears use a non-reusable "crush sleeve" ? Thanks for any and all info, this web site and the people contributing are brilliant!


kstevusa
kelly stevenson
Southern Middle Tennessee
(985 posts)

Registered:
10/25/2007 09:37AM

Main British Car:
2003 Jaguar XK8 Coupe 4.2L DOHC/ VVT / 6sp. AT

authors avatar
Re: Source for rear gear sets for 78 mgb?.............
Posted by: kstevusa
Date: November 06, 2012 03:53PM

Most MGB owners would like a better ratio, but they are rare. For the cost of a new 3.07 ratio gear set, you can probably narrow a GM or Ford Dif. and have it suit you much better. old Saying ! "Rare as Hen's teeth"



Edited 1 time(s). Last edit at 11/06/2012 07:47PM by kstevusa.


mowog1
Rick Ingram
Central Illinois
(1523 posts)

Registered:
10/17/2007 09:36PM

Main British Car:
1974.5 MGB/GT 3.9l Rover

authors avatar
Re: Source for rear gear sets for 78 mgb?.............
Posted by: mowog1
Date: November 06, 2012 05:22PM

Where are you located?

I have an MGC diff (spline drive) available in a 3.7 ratio.

MGCs were available in 3.07, 3.31, and 3.7 ratios.

For my V8, I narrowed a Ford 8" and had an Auburn 3.27 posi installed.
Get Your BritishV8 T-shirt by clicking here


roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Source for rear gear sets for 78 mgb?.............
Posted by: roverman
Date: November 06, 2012 08:02PM

Jimmy, IMHO, bolt in a T5 and never look back. 5 speeds and several od. ratios. Good Luck, roverman.


RMO 699F
Mike Maloney
SW Ohio
(531 posts)

Registered:
12/09/2007 12:28PM

Main British Car:
1974 MGB Sebring GT, 3.9 Rover V8

authors avatar
Re: Source for rear gear sets for 78 mgb?.............
Posted by: RMO 699F
Date: November 06, 2012 09:49PM

There is a 3.07 on ebay right now (see link)
[www.ebay.com]

Not sure where you are located but Babbit Bearing in Columbus, Ohio will take your mgb rear axle and machine @ 215 thousands off the carrier bearing..and install this CW&P...they have done many mgbs in this area including mine...


MGB-SBC-Jimmy
Jimmy Geske

(35 posts)

Registered:
01/27/2011 08:02AM

Main British Car:
Re: Source for rear gear sets for 78 mgb?.............
Posted by: MGB-SBC-Jimmy
Date: November 07, 2012 11:07AM

Thanks very much fellas for all your input! I was afraid it wasn't easily available parts for resonable prices. An overdrive would likely make the most sense for my application but I may keep looking for a narrowed rear at the local swaps. I should buy the jeep dispatcher axle in the classifieds and be done. It really looks like the perfect width, I have wheels for that pattern, I may just talk myself into it,hehehehe, thanks again!!


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Source for rear gear sets for 78 mgb?.............
Posted by: BlownMGB-V8
Date: November 07, 2012 04:48PM

You should jump right on that. It's a deal you won't be likely to see again.

Jim



Simon Austin
Simon Austin
Surrey, British Columbia
(107 posts)

Registered:
10/23/2007 01:44AM

Main British Car:
1977 MGB V8 / 1970 MGB GT V8 project Rover 3.5 / Rover 3.5

Re: Source for rear gear sets for 78 mgb?.............
Posted by: Simon Austin
Date: November 10, 2012 11:31PM

You can buy a set from here: [www.performancebritish.com]

$598.00 CAD.


madmax
Max Fulton
Durham, NC
(186 posts)

Registered:
10/19/2008 07:45PM

Main British Car:
1974 1/2 MGB 1972 MGB 1977 V8 project 1972 B r 1860 cc

Re: Source for rear gear sets for 78 mgb?.............
Posted by: madmax
Date: November 29, 2012 12:39AM

JImmy:

You can also get CW & P from Targett Motorsport (banner ads here). He has the 3.07 for the Salisbury diff.... New gears.

Max


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