peterbilt376x
10-13-2009, 09:13 PM
just was wondering what the difference is between the gm-4 and gm-3 turbo is?
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: turbo wespierce 10-13-2009, 10:01 PM gm-3 is setup for a spring accuated wastegate gm-4 is setup for a vacuum accuated wastegate peterbilt376x 10-13-2009, 10:55 PM so my 93 has a spring wastegate? but it has a line goin to it like a vacume line? deejaaa 10-13-2009, 11:07 PM so my 93 has a spring wastegate? but it has a line goin to it like a vacume line? chances are it has been swapped for a newer engine. my 93 is spring and the 96 is vac. peterbilt376x 10-13-2009, 11:16 PM that could be it does have a new motor in it....i dont know i just bought it,...i dont have it yet goin to pick it up this week but i know it had a tube commin off the wastgate | ||