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I have two toploaders -- one in my 66 fastback and the other I am going to rebuild for my next project. The uninstalled unit is an HEH-P model, which was used during the first half of the 1965 model year.
The uninstalled gearbox has the 25-spline output shaft, as opposed to the one in my fastback, which has the 28-spline output shaft. I am told the 28-spline units are quite a bit more robust than the small shaft units.
My question is this: Can this gearbox reasonably be upgraded to 28-slpine specifications? I'd like to put it behind a 331 stroker I am building and do not want to see it break.
I sent an email asking this question of Mark at Toploader Heaven a couple of weeks ago but did not get a response. I appreciate that he is a very busy small business owner, and am not surprised that he cannot afford to drop what he's doing and answer every inane question that is sent him.
So, I hoping someone on the Forum can help before I start ordering parts.
Am I wasting my time with this gearbox?
The uninstalled gearbox has the 25-spline output shaft, as opposed to the one in my fastback, which has the 28-spline output shaft. I am told the 28-spline units are quite a bit more robust than the small shaft units.
My question is this: Can this gearbox reasonably be upgraded to 28-slpine specifications? I'd like to put it behind a 331 stroker I am building and do not want to see it break.
I sent an email asking this question of Mark at Toploader Heaven a couple of weeks ago but did not get a response. I appreciate that he is a very busy small business owner, and am not surprised that he cannot afford to drop what he's doing and answer every inane question that is sent him.
So, I hoping someone on the Forum can help before I start ordering parts.
Am I wasting my time with this gearbox?