Re: Allison 6 Speed GMC 401
Those new generation Big Block Chevy's are interesting. PSI does the 8.8L, which is related to the 8.1L 'Mark VII' engine (revised cylinder heads), Powertrain Integration does the 8.0L, which is related to the 'Mark VI' 7.4L. To further confuse matters, PSI merged with Powertrain Integration a couple of years ago!
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