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NaturalLightKid
MMT Pro Member
Joined: Wed Jan 25, 2012 10:30 pm
Posts: 98
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 Gen 3 or 4 PD lower unit? How can you tell if a PD has a gen 3 or 4 lower unit? What are thw gear ratio for both?
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| Tue Jul 05, 2016 7:27 am |
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wade_660
MMT Addict
Joined: Mon Mar 21, 2011 7:56 pm
Posts: 523
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Gen 3 or 4 PD lower unit? Gen 3 is a 2:1 ratio
Gen 4 is a 1.52:1 ratio
I could be wrong but I think the 4 has a hex shaft and the 3 does not.
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| Tue Jul 05, 2016 7:33 am |
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BlueShamu
MMT Elite Member
Joined: Mon Feb 06, 2012 6:13 pm
Posts: 5605
Location: D'town, LA
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Gen 3 or 4 PD lower unit? There are no Gen 4's. Only Gen 3's with two different gearing options....noted above.
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| Tue Jul 05, 2016 8:11 am |
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NaturalLightKid
MMT Pro Member
Joined: Wed Jan 25, 2012 10:30 pm
Posts: 98
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Re: Gen 3 or 4 PD lower unit?
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| Tue Jul 05, 2016 8:34 am |
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BlueShamu
MMT Elite Member
Joined: Mon Feb 06, 2012 6:13 pm
Posts: 5605
Location: D'town, LA
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Re: Gen 3 or 4 PD lower unit? Prodrive can probably tell you....or tell us what speeds your getting on what size rig....the majority will figure it out real quick.
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| Tue Jul 05, 2016 11:38 am |
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JphIII
MMT Pro Member
Joined: Sun Nov 02, 2014 8:23 am
Posts: 308
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Re: Gen 3 or 4 PD lower unit? There is a way to tell, apparently there is some kind of marking on the L/U. I can't remember what it is though...
_________________
PD 1754 X Series and a PD 37EFI
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| Tue Jul 05, 2016 11:41 am |
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wade_660
MMT Addict
Joined: Mon Mar 21, 2011 7:56 pm
Posts: 523
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Re: Gen 3 or 4 PD lower unit? I saw one this weekend. It'll be right under the gear box on the lower unit on the oil filter side. I swore it said gen 4. Could be wrong. Would the hex shaft not give it away, or does a gen 3 have a hex?
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| Tue Jul 05, 2016 11:51 am |
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BlueShamu
MMT Elite Member
Joined: Mon Feb 06, 2012 6:13 pm
Posts: 5605
Location: D'town, LA
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Gen 3 or 4 PD lower unit? Did PD go from splined to hex?
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| Tue Jul 05, 2016 12:38 pm |
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BlueShamu
MMT Elite Member
Joined: Mon Feb 06, 2012 6:13 pm
Posts: 5605
Location: D'town, LA
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Re: Gen 3 or 4 PD lower unit?
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| Tue Jul 05, 2016 12:45 pm |
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teammarshmafia
MMT Pro Member
Joined: Tue May 14, 2013 2:18 pm
Posts: 478
Location: southeast, Louisiana
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Re: Gen 3 or 4 PD lower unit? They have a tapered splined shaft not a hex
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_________________
Gen III Pro Drive with a JBP stage 2 pushin 18x54 madmancustom
Jus nut up and grab a handful of throttle
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| Tue Jul 05, 2016 4:22 pm |
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wade_660
MMT Addict
Joined: Mon Mar 21, 2011 7:56 pm
Posts: 523
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Re: Gen 3 or 4 PD lower unit? I stand corrected. Carry on
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| Tue Jul 05, 2016 4:44 pm |
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NaturalLightKid
MMT Pro Member
Joined: Wed Jan 25, 2012 10:30 pm
Posts: 98
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Re: Gen 3 or 4 PD lower unit?
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| Tue Jul 05, 2016 6:07 pm |
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cb5331
MMT Super Elite Member
Joined: Fri Dec 18, 2009 8:10 pm
Posts: 16915
Location: Rowlett, TX
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Re: Gen 3 or 4 PD lower unit? Uh oh. Blue, what you think that g4 stamp stands for? 
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| Tue Jul 05, 2016 6:10 pm |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm
Posts: 4820
Location: West Monroe, LA
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Re: Gen 3 or 4 PD lower unit? It's stands for "Blue is getting his lower unit yanked by pd" 
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| Tue Jul 05, 2016 6:15 pm |
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BlueShamu
MMT Elite Member
Joined: Mon Feb 06, 2012 6:13 pm
Posts: 5605
Location: D'town, LA
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Re: Gen 3 or 4 PD lower unit? I stand corrected, then. PD needs to update their manuals!
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| Tue Jul 05, 2016 7:45 pm |
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NaturalLightKid
MMT Pro Member
Joined: Wed Jan 25, 2012 10:30 pm
Posts: 98
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Re: Gen 3 or 4 PD lower unit? How much cost/trouble is it to convert one from a 3 to a 4?
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| Wed Jul 06, 2016 5:24 pm |
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cb5331
MMT Super Elite Member
Joined: Fri Dec 18, 2009 8:10 pm
Posts: 16915
Location: Rowlett, TX
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Re: Gen 3 or 4 PD lower unit? If you got a way to suspend the engine for a few minutes (preferably an engine hoist), its pretty easy. Maybe a 30 minute job. Lil more the first time you do it, lil less if you've done it before.
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| Wed Jul 06, 2016 5:50 pm |
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cupnglide
MMT Pro Member
Joined: Sat Feb 06, 2010 8:59 am
Posts: 137
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Re: Gen 3 or 4 PD lower unit? Last time I checked on cost, it was $1500 for the part. That was back when they introduced the 1.52:1 part.
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| Thu Jul 07, 2016 8:53 am |
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NaturalLightKid
MMT Pro Member
Joined: Wed Jan 25, 2012 10:30 pm
Posts: 98
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Re: Gen 3 or 4 PD lower unit?
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| Fri Jul 08, 2016 11:55 am |
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