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MG MGB GT V8 Factory Originals Technical - MGC Back Axle

Hi All,

I may have an option on a MGC back axle. Are there any styles or types I should go for or avoid?

Is it likely to need much work/overhauling or does it just depend on the axle?

I know very little about C's.

Liam.
Liam

Hi Liam,

I took a 3.3 axle from a C and it works fine with the 175/80 HR 14 tyres. It is the same reduction that was used for the RV8.
You can check it out by opening the axle. Have a look upon the diff. There aught to be BTB840 stamped on the ring gear for a 3.3.
You should not buy a 3.7 axle (same as MGB automatic).
If it is a 3.07 it is ok, these diffs were used for the factory V8 and SOME MGC's.
Take care of the differtent with on a ww axle, if it is one of these, you will need the rims of the Scimitar GTE and an additional spacer of 5 mm (Nissan/Honda) on each side to clear the inner wheel arch.
The flange of the prop shaft is differnt, a Rover P6B will fit the C axle flange and the LT77 gearbox but has to be shortened and ballanced.

Good Luck
Ralph
Ralph

Ralph, that is very useful.

Do you know the part number for a 3.07 (and a 3.7) ratio axle?

I have to investigate these from a distance.

Liam

Hi Liam,

here are the part numbers for the Sailsbury axle:
3.070 is BTB900 on diff cage BTB840
3.307 is BTB841 on BTB840
3.700 is BTB1244 on BTB866
3.907 is BTB856 on BTB866


Converting a B 1800 3.9 to another gearing means you will need to have your diff cage machined to fit the C type ring gear. These conversions of an exissting axle is best left to a skilled workshop as very special tools are necessary therefore.

Hope this helps,
Have a nice weekend

Ralph
Ralph

Rqlph, that is a great help, thank you very much.

Liam.
Liam

This thread was discussed between 03/03/2006 and 04/03/2006

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