Bolt In Sprag
Broken transmission case
Pictured Above is a broken transmission case, this occurs from the immense amount torsional stress placed on the cases interference fit sprag race while launching in Drive 1st gear.
Bolt in Sprag
Installing a bolt in sprag into the transmission case helps to evenly distribute the stresses associated while launching in auto drive first gear when the low/ reverse band is not applied. Although this is not a sure fire way to keep the case intact, it certainly does help.
Installation of a bolt in sprag
To install a bolt in sprag, the case must be drilled with the pictured jig.