MG Sports Cars

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

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W4MGB
Les Biglands

(4 posts)

Registered:
03/04/2009 02:31PM

Main British Car:
3.07
Posted by: W4MGB
Date: February 07, 2010 03:14PM

How do i change the 3.9 ratio MGB rear end to a 3.07.I have a 78 MGB with a Rover V8 and 5 speed.I bought an MGC 3.07 pumpkin to install.Any info will be appreciated.Thanks.Les.W4MGB


mgb260
Jim Nichols
Sequim,WA
(2463 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 3.07
Posted by: mgb260
Date: February 07, 2010 04:12PM

If I recall correctly you have to machine .215 off MGB case for 3.07 gear to fit or use the MGC case?


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: 3.07
Posted by: mowog1
Date: February 07, 2010 04:52PM

You can simply install the MGC differential complete...much easier than installing the MGC C&P into the MGB casing.

Be aware that the MGC differential most likely came from a wire-wheeled car (if sourced in the States) and will be narrower than your current MGB differential (assuming that you have a steel wheeled MGB)

Have you verified that the MGC differential is indeed a 3.07. They were available in 3.07, 3.7, and 3.31 gearsets.

There should be a stamping on the case...the gears are stamped as well.
Differential Case Gearset Marking.jpg
Gearset markings.jpg
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W4MGB
Les Biglands

(4 posts)

Registered:
03/04/2009 02:31PM

Main British Car:
Re: 3.07
Posted by: W4MGB
Date: February 08, 2010 07:35AM

The numbers are 501 14 43.Thanks.Les.


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: 3.07
Posted by: mowog1
Date: February 08, 2010 10:32AM

43/14 = 3.07


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