Ive heard of the m-22 or muncie four speed's chevy used but never have i heard of ford having or using a rock crusher trans. Theres 2 posts of craigslists both with 78-79 broncos (which i thought those only came with the c-6) saying they have a trans called a 351 Rock Crusher?? ??? ???
they did come with a 4 speed not shur if they were called a rockcrusher but they are very strong i had one that i part out getting harder to find not that many of them out there
its some body sell some thing and thay want it sold so thay use big words from the 70s thank thay can trick some one into buying it.
THEY DO CLAIM TH FORD TOP LOADERS ARE WAY STRONGER THAN THE M-22 ROCK CRUSHER MUNCIE I HAVE A FORD TRUCK 77 TOP LOADER FOR SALE 3 SPEED W/ OVERDRIVE $ 250 .00 SEEMS TO SHIFT GOOD ALSO HAVE A COMPLETELY REBUILT SAGINAW 4 SPEED W/ 2 STYLES OF SHIFTER S HURST $ 500.00 DAVE