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Discussion Starter · #1 ·
Hi guys, I have a 1995 Trooper with the MUA5 @217000 miles in it and am very happy with it still, but I am a fan of future proofing it, as I'm sure the MUA5 will become unserviceable in the near future, and the AR5 is still in production. I know that the late model 2nd gen Troopers came with the Aisin AR5, essentially the same trans as my 4Runners R150F, and they look identical except of course the 60 GM bell and the Isuzu transfer case.

I assumed that the V6 2nd gen amigos/sports/rodeos used the same AR5 as well, considering its a Aisin-Warner transmission and also put in Jeeps and some GM stuff from that period.

I found a 4x4 5 speed trans in the JY last week in a 99 amigo, behind the 3.2. I was very sad to see this little gem in the yard, but its frame was completely rotted out. Note to everyone, POR15 (or maybe it was bedliner) on a rotted frame peels right back off...

Anyways I noted a lot of differences with it and the 98+ Trooper or any AR5 for that matter (intgrated bell housing and trasfer case, thinner center support plate, less chunky webbing) and have concluded its most likely an MUA5, oddly enough. Weird that the Trooper made in Japan gets a Toyota/Aisin/Warner franken-trans common to US makes and some Toyotas of that era and the Illinois built models get a Isuzu japanese made MUA5... ill never understand the logistics of auto companies..

Anyway just wondering if there was any good definitive info on it specs wise, couldn't find much or even confirm what 4x4 5 speed trans late model rodeos/amigos/sports came with.

I noted that the L4 and V6 2nd 98+ amigo do come with the same 'looking' trans (with what appears to be different bell housing patterns), and the MUA5 in my trooper appears nearly identical accept it has a large Isuzu logo cast into the right side in the area of heavy webbing (didn't see this on the JY trans or the ebay one I found).

Are there any likely differences with gearing, strength, number of synchros, trans length etc. for this late model 'MUA5' looking trans? Part of me still wants it, if anything to save a non-renewable resource from being crushed.

mike
 

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Discussion Starter · #3 ·
Ah I see. I also did find an older post by Jerry mentioning that every single 88+ 4x4 trans was an MUA5 except the 1998-02 trooper. My best guess at this point is it was related to the higher torque of the 3.5 being above the rating of the MUA.

Ill go ahead and assume all MUA5 have essentially the same specs other then the extra synchro's from 92+.
 

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98 Rodeo, 4JB1-TC
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I doubt it was the torque. The diesel Isuzu pickups still use a variant of the MUA5. Don't think the 3.5 would have more torque than a 3.0 common rail turbo diesel.
 

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I have a 98 2.2 Amigo and it uses an MUA5 as well. I think the Tremec may have been 2WD? Not sure, but the only difference between my MUA and the V6 is the bolt pattern - I've swapped parts.
 

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98 Rodeo, 4JB1-TC
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Would a MUA5 4X4 trans from a 2.2 amigo bolt up to a 3.2 motor?
I don't believe the 2.2 uses a MUA5 Transmission. In the event that it does, it will not bolt up to a 3.2.
 

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98 Rodeo, 4JB1-TC
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I'm

No. The 2.2 is not really an even Isuzu engine. And I'm fairly sure its transmission is not a MUA-5.
The one that the 2wd uses is a Tremec T5/Borg Warner. What I hav never been able to find info on, is what the configuration is for the elusive 4wd 2.2 setup.
 

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@Buster28 -- That can't be right for the US market. It shows MSG transmissions for 2.6L and 3.2L engines.
I am not sure why. I didn't create the chart and just assumed 98-00 Amigo had an msg transmission. I think the msg is lighter than a mua. Maybe Jerry has some more info on the difference between msg and mua transmissions.
 

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Original owner, 1983 P'up LS (diesel)
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In reading through some other posts it seems that msg5F is just another name for mua5 with 4wd
That's unlikely. The 4wd MSG-5 was the MSG5
-5T (the "T" signified it had a transfer case). The MUA-5 is a different transmission altogether.
 

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98 Rodeo, 4JB1-TC
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That's unlikely. The 4wd MSG-5 was the MSG5
-5T (the "T" signified it had a transfer case). The MUA-5 is a different transmission altogether.
I seem to recall Jerry having mentioned something about the MSG5F nomenclature being used for the MUA5 in some documentation.
 
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