Hi Kevin, . .
. . First, do you have a 1928 LP or 1929 LQ truck? What kind of front and rear axles do you have now? What is the model number of the T-5 you have? (Green sticker on top of case or metal tab on bolt that holds tail to case. Both are frequently missing. The first 4 numbers are 1352- .) Look at web page <
http://www.britishv8.org/Articles/Borg-Warner-T5-ID-Tags.htm> to locate your ratios.
. . The LP & LQ had 6 bolts on 5.5” diameter holding the front wheels to the brake drums. The rear wheels had 8 bolts holding the rear wheels to the brake drums in the same pattern used on ¾ & One Ton trucks made after 1946. This 8 bolt pattern was first used on the 1921 model G thru the 1929 model LQ. The 1931 MB thru the 2002 3500HD used 10 bolts rear and only 5 of those on the front. All 1926 - 30 trucks wore 20" tires and had 6 lugs holding the rim to the wheel.
. . What size are the Green metal wheels you got from Gary Wallace? 1927 passenger wore 29 X 4.40 tires. 1928 wore 30 X 4.50 tires (AKA: 4.50 X 21” rim), 1929 wore 4.50 X 20” rim, 1930 wore 4.75 X 19” rim. All the trucks wore 20" tires and had 6 lugs holding the rim to the wheel. . .
. . If you want to use metal wheels with 32 X 6 (6.00 X 20) tires, find the wheels pictured on the 1929 LQ. If you want 4 wheel hydraulic brakes, use any Chevy half ton axle from 1936 – 54 on front. If you want a higher rear end ratio, use a ¾ ton axle from the 1980s in the rear that is semi floating and not full floating. They have ratios from 2.87 to 5.14. You will have to calculate engine HP and aerodynamics to get the ratio for best speed and mileage. You will have to use a torque arm or multilink rear suspension to use a T-5 with Hotchkiss propeller shaft to avoid spring wrap. . .
. . Good luck, Lou
First picture is a 1921 model G ad. Second is 1929 LQ ad, Third is 1931 MB.