Rear Ends

lsr mike · Post by **lsr mike** » Mon Feb 07, 2011 9:00 am

No, Not The ones on Women, the ones in Mighty Max Trucks!

Ok, I'm looking for more speed. I got a PM from an individual on another Forum wondering about a 3000GT Ratio, 3.307. he had "heard" it fit the MM Diff.
Well "heard" isn't good enough for me to Buy, but good enough to investigate.
I've been considering a Ford 8.8 swap but then my wheels don't work (5 vs 6 bolts) and then I'd still have to massage the ratio etc...

is there a question in here? Ok. does anyone have any info /experience here?

I do see where the Starion and MM share Diff ratio's, i.e. the Ring and Pinion will swap, I see where Starion Guys are going for the 3.909 and 4.22 ratios for Drag racing. and there is the mention that they have a Mitsubishi 8 inch diff.

Further research shows the 3000GT ratio is P/N MB185450, the 3.909 ratio in the MM is P/N MB185461 the 4.22 is MB185462 so the numbering leans in that direction also...

Ok back to the question does anyone know?

lsr mike · Post by **lsr mike** » Tue Feb 08, 2011 8:48 am

yeah, the HRCS had the only meaningful discussion on the topic. I see Mighty Max gears going into Starions, I'm trying to find 3000GT to Starion swaps or something that will prove the theorem.

77amc · Post by **77amc** » Wed Feb 09, 2011 12:28 am

Mike, I know this might be WAY out there but, I've got a toy rear in my 88 max and it's a 3.07..? (this thing can just barely get out of i'ts own way with a 2.6. So, going to a Buick V6/200r4)
I was given another 3rd member from a friend that turns out to be a 3.78.
In looking at this one compared to max 4.22 would get me confused sometimes because of the comparrison was soo close between the two.

SO, What about just using a toyota mid section welded in the max's axle tubes??
I have already tossed the max axles, so I can't do a detailed comparrison when I get to the point of swapping out my 3rd members.
Wouldn't that be cool if the axles had the same spline count?
They ARE quite similar in length though

I think that I am only off about 3/4" from side to side

E

lsr mike · Post by **lsr mike** » Wed Feb 09, 2011 11:45 pm

The quest is to find "other" ratios that are mechanically compatible to the MM rear diff. My experience is that Mitsubishi re-used a LOT of parts amongst vehicle lines, i.e. my mechanical lifters are spec'd for a 1.8 liter motor (4g61) but are a direct replacement for the Hydraulic lifters in my 2.4 Liter (4G64).

The Starion Guys are using the MM Ring gears in their Diffs. to get lower ratios for the low end grunt in the quarter. I'm looking for compatibility in other lines of cars with higher diff Ratios. changing to a Toyota brings in the wheels and shafts etc... I'm still a cheap and dirty racer... It's all for bragging rights and Trophy's, no monetary rewards in LSR.

<excess bragging removed>

any help appreciated.

92 GSR-4 · Post by **92 GSR-4** » Sat Feb 12, 2011 5:04 pm

4G61 is a 1.6L

But the DOHC components are basically the same as the 4G63.

I don't know if its been mentioned to you, but the old Montero/Raider has a similar rear end. My buddy has a MM he was looking to get a viscous coupling rear diff from the junkyard for. Apparently the Montero/Raider has the ratio he wanted and I know he was doing a 4G63 swap....so maybe that opens some more options to you.

lsr mike · Post by **lsr mike** » Mon Feb 14, 2011 8:38 am

Montero's are in the same Haynes Manual as the Mighty Max. They have the Same ratios.

77amc · Post by **77amc** » Mon Feb 14, 2011 10:44 pm

lsr mike wrote:Montero's are in the same Haynes Manual as the Mighty Max. They have the Same ratios.

Thats' why I mentioned the Yota.. Wider range of offerings, but i don't remember seeing anything numerically lower than 3.07.

And from what I've read in the past few years, is that 3.54 is the lowest for the max's.

(I had 2.73's in my ol Monte carlo.. Man that thing would just cruise down the road.)
What about the Isuzu's or mazdas?
A freind has a 85 pup in her yard with stock rear disc brakes and a 6lug pattern

E

lsr mike · Post by **lsr mike** » Tue Feb 15, 2011 8:59 am

Switching Brands is not in the formula at the moment. It changes the Wheel Bolt Pattern to 5, making my 2 sets of 6 bolt wheels obsolete. wanting to stick with the Mitsu Rear end. It appears there isn't any experience in this arena. Time to Blaze the Trail again.