As edski pointed out you can't just take a gear out of something and put it in to change the ratio. Gears come in matching sets. If you were to find a lower 1'st gear you would need the cluster gear to match it. The cluster would also have to match 2'nd & 3'rd gears as well. Any gear changes will require a complete disassembly of the transmission. I'll be happy to trade you straight across for a rebuilt (4 bolt) OD trans. It has the same ratio as the trans you took out. Transportation would be the only issue.
Fred

Last edited by rfs56trk; 07/09/2013 11:20 AM.

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine