It has been about a month since the last earnings report for Allison Transmission (ALSN) . Shares have added about 7% in that time frame, outperforming the S&P 500.But investors have to be wondering, will the recent positive trend continue leading up to its next earnings release, or is Allison Transmission due for a pullback? Well, first let's take a quick look at its latest earnings report in order to get a better handle on the recent drivers for Allison Transmission Holdings, Inc. before we dive into how ...