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7.25" gears #1070366 03/30/14 05:54 AM
Joined: Mar 2008
Posts: 413
spencevans Offline OP
Mudrunner
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
Joined: Feb 2005
Posts: 7,462
rxinhed Offline
Trail Leader
*****
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.

Re: 7.25" gears [Re: rxinhed] #1070368 03/30/14 06:56 AM
Joined: Mar 2008
Posts: 413
spencevans Offline OP
Mudrunner
Quote
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.
Re: 7.25" gears [Re: spencevans] #1070369 03/30/14 09:39 PM
Joined: Jan 2001
Posts: 13,649
fasteddy Offline
Web Wheeler
*****
Yes.


Not responsible for advice not taken...
Re: 7.25" gears [Re: fasteddy] #1070370 03/31/14 04:27 AM
Joined: Mar 2008
Posts: 413
spencevans Offline OP
Mudrunner
Quote
Yes.


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.
Re: 7.25" gears [Re: spencevans] #1070371 04/07/14 12:28 AM
Joined: Feb 2005
Posts: 7,462
rxinhed Offline
Trail Leader
*****
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.

Re: 7.25" gears [Re: rxinhed] #1070372 04/07/14 05:30 AM
Joined: Mar 2008
Posts: 413
spencevans Offline OP
Mudrunner
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.
Re: 7.25" gears [Re: spencevans] #1070373 04/07/14 07:19 PM
Joined: Feb 2005
Posts: 7,462
rxinhed Offline
Trail Leader
*****
I have no way to confirm, as the differential was a loose part included with my MM purchase.

Re: 7.25" gears [Re: rxinhed] #1070374 04/08/14 01:26 PM
Joined: Aug 2009
Posts: 989
H
haztoys Offline
Rock Warrior
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

Re: 7.25" gears [Re: haztoys] #1070375 04/08/14 10:19 PM
Joined: Feb 2005
Posts: 7,462
rxinhed Offline
Trail Leader
*****
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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