Would you change rear gear?

[68Stepbed]

Originally Posted by Sawlog

350, bored .040. 5.7in stroke
Dart iron eagle heads 165cc runners. 67 c.f. chambers
.221-221@.50 duration. .470 .470 lift lsa 108
Th400 tranny, 2000 stall.
31 10.50 rear tire.

OK, it sounds like you have a slightly hotter than stock engine. The heads should be good for building low end torque, but add just a tad of compression. The cam looks like it would be a good mid range power setup while still making decent torque in the 2500-3500 rpm range. Seems to be a good setup for a stout street cruiser.

Your kicker is the tires. Is your truck 2wd or 4wd? Those 31's are going to make your 3.07's feel like 2.73's. If you ever plan to run a smaller tire, the 3.07 gear would still work well, but if you plan to keep the same size tire, I would suggest a 3.42 gear to make better use of the rpm range of the engine. A LSD like an Eaton would also be beneficial to keep from one-wheel- peeling all the time.

Also, FWIW, the 3.07 gear is a 3-series gear, and 3.42 is considered a 4-series gear, but you can get a gear made for a 3-series carrier.