Project "Second Chance" - Hot Rod 66' GMC

[siggyfreud]

Originally Posted by kieth

Nice build, we GMC guys have to stick together. Before you dive off into changing rear axle ratios send me the spec's on your truck along with your email address and I will send you a spreadsheet that shows:

1. usable torque to the ground (all rear axle ratios, transmissions,)

2. diameter from the ground to the top of the rear tire in inches

3. your email address

4. transmission you plan on using

If you are going to change tires and wheels send me what you have now and then later send me the new diameters so we can compare them.

5. I think 3:73 (700r4) will work for your truck but just guessing. Kieth

Will do, thanks for the offer to help. Currently its 4.11 with the 700r4 and 27.5" tires. I can't remember what RPM I was turning in 4th, but I think it was little over 2k, but the converter wasn't locking up either. Would ideally like to turn in the 1700-1800 range or slightly lower, which is why I was thinking 3.73. Probably won't go much taller on the tire, maybe slightly though (1-2" max).

Eventually will do an over/under, so maybe 3.73 gets me to the 1900 range, and the eventual over/under will get me to my end goal.

Email is longshotsystems@gmail.com.

Thanks again!