March 87T vs. DGB

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11.13.22, 8:26 AM
Craig71188

March 87T vs. DGB

I have a March 87T gearbox (not currently in a formula chassis). Per the notes I have, it can have "wide" or "narrow" gears. From what I am seeing in the box, this has narrow gears save for 5th which is wider. I have been told these share some internals with the Hewland DGB, but have not been able to confirm. Spare gearsets that were once with the car had disappeared before I acquired it. Can anyone confirm if the DGB gearsets are the same / interchangeable? If so, DGB gears would be considered "narrow"? Thank you!
11.13.22, 11:50 AM
pakracer

DG-B Gears

The difference in width between narrow and wide gears in a DG-B is the narrow are .695" for the narrow and .995" for the wide. It is my understanding that the gears are the same, but the pinion and hubs are different. If you have the trans apart and can measure the diameter of the hubs and send me a PM I can tell you as I have a selection of both wide and narrow DG-B gears.
11.13.22, 6:43 PM
R. Pare

I still have the original March parts drawings for that box and for the f & r uprights.
11.14.22, 9:32 AM
Craig71188

Quote:

Originally Posted by R. Pare

I still have the original March parts drawings for that box and for the f & r uprights.

Yes, I purchased a copy from you and it has been a great asset!