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I have a TR6 trans in my TR3.Will a TR3 speedometer gear housing thread into a TR6 transmission without any issues? I'm assuming a TR6 speedo cable could then be connected to the TR3 Speedo gauge. Alternatively could I use a TR6 gear housing and mate that up to a TR3 speedo gauge?
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TR6 Speedo gear housings :TR3 and TR6
- Thread starter karls59tr
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TR3driver
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The TR3 cable will fit right onto the TR6 fitting.
But I'm not sure offhand about interchanging the housings; been too long since I messed with a non-OD gearbox
PS, if it is a late TR6 gearbox, your TR3 speedo may read about 10% low. The TR6 speedo drive ratio changed around 1974 (same time as the J-type OD was introduced) from the earlier 5:2 ratio to whatever makes the cable turn 1000 times per mile.
But I'm not sure offhand about interchanging the housings; been too long since I messed with a non-OD gearbox
PS, if it is a late TR6 gearbox, your TR3 speedo may read about 10% low. The TR6 speedo drive ratio changed around 1974 (same time as the J-type OD was introduced) from the earlier 5:2 ratio to whatever makes the cable turn 1000 times per mile.