I too killed a good few overdrive gearboxes back in the day! BUT it was the (mostly 3 rail) gearboxes I killed, not the overdrive units. I became quite adept at rebuilding my GT6 gearbox and rebuilt the same box 2-3 times whilst retaining the same D type o/d unit untouched save for a swarf rinse!
Although the factory handbook has always recommended not shifting with o/d engaged (early 60s even recommended declutching!) I've ALWAYS gone up the box 1-2-3-3o/d-4o/d and missed out direct top, since as Alun has pointed out, the difference between o/d 3rd and direct top is negligible! However i've always downshifted the "correct" way, disengaging the o/d first then going down the box as needed. I think the shock load I can feel, coming out of o/d 3rd into direct 3rd under heavy braking and a trailing throttle, just made me wince a bit too much!
Steve
_________________ '73 2 door Toledo with Vauxhall Carlton 2.0 8v engine (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine (The Dolomega)
'72 Triumph 1500FWD in Slate Grey, Now with RWD and Carledo powertrain!
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