[Healeys] Transmission OD - 22% vs 28%

[John H]

Listers,

I am swapping tranmissions in my BN7.  One coming out is a 22% side shift.  The one going in is a 28% side shift and just rebuilt. Bundled with my 3.54 Lempert gear set should give me great cruising capabilities on demand.

Question:  the 22% has an enclosed area with a removable cover where the solenoid shaft engages and disengages the OD (to keep debris and moisture out, I assume)  The 28% does not have this enclosure leaving it exposed to debris and moisture.  

The parts manual shows only a metal deflector (called a stone gaurd) in front of the solenoid.  Is this correct? and is there a way to convert to the enclosed version, which seems safer in the long run?

Thanks in advance,

John Homonek
Atlanta Chapter AHCA
1959 BN7
1960 AN5
1974 Jensen Healey