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 7.25" gears
#1070366
03/30/14 05:54 AM
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Joined: Mar 2008
Posts: 413
OP
Mudrunner
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I want to change my differential gears from 3.90 to 3.55 on my 1983 Mitsubishi Pickup. I want to lower the RPM's at cruising speed on the interstate to maximize my mpg and driving comfort. I can easily obtain the 3.55 gears for the 8" rear end from a 2wd Mitsubishi Pickup but I'm wondering if there is 3.55 gear avail for the 7.25 front from like a Starion or something similar? Does any one know?
Spence
1985 Mitsubishi PU 2.3 Turbo Diesel, 13" lift, Watercooled turbo, 4D56 Head, Atlas II,Fox Coilovers, Elockers,
1983 Mitsubishi PU 2.5 Turbo Diesel 4x4, fully restored
2003 G500, sliders, beadlocks, roofrack, ladder etc.
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Re: 7.25" gears
[Re: spencevans]
#1070367
03/30/14 06:46 AM
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Joined: Feb 2005
Posts: 7,462
Trail Leader
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I have a Starion 3.54 gear set that I'll send you for the shipping. This would be impetus toward my goal of LSD for the front of my MM.
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Re: 7.25" gears
[Re: rxinhed]
#1070368
03/30/14 06:56 AM
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Joined: Mar 2008
Posts: 413
OP
Mudrunner
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I have a Starion 3.54 gear set that I'll send you for the shipping. This would be impetus toward my goal of LSD for the front of my MM. That's a great offer seeing how they will fit in a flat rate box. I guess the question is, are they cut the right way to bolt into the front of a Mighty Max?
Spence
1985 Mitsubishi PU 2.3 Turbo Diesel, 13" lift, Watercooled turbo, 4D56 Head, Atlas II,Fox Coilovers, Elockers,
1983 Mitsubishi PU 2.5 Turbo Diesel 4x4, fully restored
2003 G500, sliders, beadlocks, roofrack, ladder etc.
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Re: 7.25" gears
[Re: spencevans]
#1070369
03/30/14 09:39 PM
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Joined: Jan 2001
Posts: 13,649
Web Wheeler
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Not responsible for advice not taken...
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Re: 7.25" gears
[Re: fasteddy]
#1070370
03/31/14 04:27 AM
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Joined: Mar 2008
Posts: 413
OP
Mudrunner
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It looks like I am in business then. This should lower my RPM's from 2600 RPM's to 2350 RPM's at 65MPH. I know it may not seem like a lot but this little diesel is much happier at 2350 RPM's and it will get better MPG's because I will not be winding out the turbo.
Spence
1985 Mitsubishi PU 2.3 Turbo Diesel, 13" lift, Watercooled turbo, 4D56 Head, Atlas II,Fox Coilovers, Elockers,
1983 Mitsubishi PU 2.5 Turbo Diesel 4x4, fully restored
2003 G500, sliders, beadlocks, roofrack, ladder etc.
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Re: 7.25" gears
[Re: spencevans]
#1070371
04/07/14 12:28 AM
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Joined: Feb 2005
Posts: 7,462
Trail Leader
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Starion diff I have is now disassembled, yes 3.545 gears, no to 7.25"...is an 8".
Offer is still good if you want the pieces.
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Re: 7.25" gears
[Re: rxinhed]
#1070372
04/07/14 05:30 AM
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Joined: Mar 2008
Posts: 413
OP
Mudrunner
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so it's an 88+ model year?
Spence
1985 Mitsubishi PU 2.3 Turbo Diesel, 13" lift, Watercooled turbo, 4D56 Head, Atlas II,Fox Coilovers, Elockers,
1983 Mitsubishi PU 2.5 Turbo Diesel 4x4, fully restored
2003 G500, sliders, beadlocks, roofrack, ladder etc.
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Re: 7.25" gears
[Re: spencevans]
#1070373
04/07/14 07:19 PM
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Joined: Feb 2005
Posts: 7,462
Trail Leader
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I have no way to confirm, as the differential was a loose part included with my MM purchase.
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Re: 7.25" gears
[Re: rxinhed]
#1070374
04/08/14 01:26 PM
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Joined: Aug 2009
Posts: 989
Rock Warrior
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Is what you want is 83 84 and half of 85 years of Starion diff thats the 7.5 gears ... Or RWD car 81 on back ...And as one who has done a lot of gear work on Mitsu's I think you will need to do some machine work to make it all work ....But I "think" theres two differant gear sets in 7.5 NR...
Captain Gear Box
Hazardous Toys inc
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Re: 7.25" gears
[Re: haztoys]
#1070375
04/08/14 10:19 PM
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Joined: Feb 2005
Posts: 7,462
Trail Leader
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Could you not also swap to a V6 Montero 8" front differential case and the later Starion LSD with 4-cyl CV axles your MM has? A thought...
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