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MG MGB Technical - Banjo/Tube Differential Gears

A fellow MGCC-LIC club member has a modified MGA/B banjo differential case to be used for a T type conversion; with tube axle stub ends welded to the banjo case. In addition he had the tube axles shorten to fit the banjo pumpkin. The question is; can he use the tube axle spider gears (BTB428) in this application or is there another spider gear set for this conversion? The banjo spiders are (BTB150) & have a different spline.
Rich Boris

Rich
I'm no expert on this but I think the MGA axle has course spline axles and the banjo diffed MGB has the fine spline
As far as I know the side gears are swapable

but the Salisbury Mgb has the same spline axles but I don't think these gears will swap over

I stand to be corrected but I believe this is how it is
willy
William Revit

Early MGA used coarse (10?) spline, middle MGAs 25 spline and the last ones 26 spline like an MGB

So you need to count your splines

dominic clancy

The question is can the tube axle spider gears; which will connect to the shortened tube axles work in a banjo pumpkin?
Rich Boris

Rich
As you are aware they are different part no.s but in reality they might have a minor difference which your machinist could sort of 'adjust'

It could be as simple as different dia. spigot on the rear of the gear or different depth or worst case different all together
You probably need to pull both apart and compare them
That's all I can offer sorry
cheers willy








































William Revit

I'm overseas at present so can't immediately lay my hands on any to confirm, but IIRC:
The splines are the same for both tube and Banjo on the MGB, the only different banjo splines being those fitted to the MGA as above.
The only difference between the gears is in the length of the boss (the diameter of the boss is the same). I am sure I have shortened one to make up the other at some stage.
What I can't remember offhand is which is the longer one (brain got lazy as they are handily sorted into different bins on the shelf)
So if my memory is correct, it sounds like the axle your coleague started with was an MGA one, and all he'll need to do for this application is get MGB banjo gears.

(And if my memory is scrambled, apologies!)
Paul Walbran

This thread was discussed between 16/08/2014 and 19/08/2014

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