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MUA5 to C223 for offroad

IowaOffRoad

Practical Engineer
Joined
Feb 19, 2021
Member Number
3513
Messages
495
Loc
SW Iowa
Thought the Isuzu page was light on posts. I have all the parts collected to do this, except the transmission is in my DD :rolleyes: so I can't put them side by side.

I've seen this on some of the Isuzu specific sites, but has anyone here done it? Supposedly you can cut the starter ear off and weld it to the other side, the bolt pattern is the same. Who's go the experience? If anyone has done this, how does it hold up? Is there a better way?
 

KungFooMASTA

El Stupido
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May 19, 2020
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361
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17 miles West of Murdock KS
I have heard the mua5 bolts up to the 1.8 Isuzu Chevette diesel engine but nobody will confirm it. They just say their cousins uncledads great grandmas friends neighbor catty corner to them did it and it bolts right up like factory. Ive just found a factory 5spd and am putting it in a Suzuki SJ410 anyways so its already got a divorced case so a 2wd trans is fine for what I got.

From what Ive heard the only thing that bolts up directly to a c223 is the 4spd4x4 built in tcase or the 2wd 5spd that came behind them.

If it was as simple as doing what you say it would be worth a try for that. It would be easier than finding the correct flywheel pressure plate , starter and building and adapter plate for a Toyota trans.
 

IowaOffRoad

Practical Engineer
Joined
Feb 19, 2021
Member Number
3513
Messages
495
Loc
SW Iowa
I have heard the mua5 bolts up to the 1.8 Isuzu Chevette diesel engine but nobody will confirm it. They just say their cousins uncledads great grandmas friends neighbor catty corner to them did it and it bolts right up like factory. Ive just found a factory 5spd and am putting it in a Suzuki SJ410 anyways so its already got a divorced case so a 2wd trans is fine for what I got.

From what Ive heard the only thing that bolts up directly to a c223 is the 4spd4x4 built in tcase or the 2wd 5spd that came behind them.

If it was as simple as doing what you say it would be worth a try for that. It would be easier than finding the correct flywheel pressure plate , starter and building and adapter plate for a Toyota trans.
I do know that after '82 you could get the c223 and c223t with the 5spd in 4x4 as I have seen a few, mostly in troopers. I get you with the hearsay, I've read/heard many things from many people who have never done it. I did read one thread on planetisuzoo (if I remember it correctly) where a guy had pictures of an MU5 he had cut the starter bump off the passenger side of the gas bellhousing and welded it in on the drivers side like the diesel and had it bolted up to a c223. But it's one guy, once, and I haven't seen it since.
If I can locate a spare MU5, I'm doing it (or attempting it) and will document it here. Pity about all the Isuzus here in the rust belt have been scrapped already.
 

SSSRodeo

Texan
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The Thriving Metropolis of Rhome Texas
In order to bolt up an MUA5 to a C223 you need the front half of thr transmission that came behind that engine. The front half is basically the diesel bell housing & the front case half of the tranny. A 4 speed IIRC. The MUA5 and the earlier 86 trannys use the same gear box configuration. Just different bell housings cast on them. And yes they are interchangeable. I have 2 of them. Both bolted to MUA5 thransmissions. I run the diesel flywheel and Gasser clutch plate.
I have a picture of one of them on another computer if you'd like to see one.

The MUA5 also came with the bolt pattern for a 2.8 & 3.2 GM front wheel drive engines. Early Cameroes used the 3.2 motors BTY! And the rare Pontiac 3.8L motor. But that's another whole can of worms to open. I've got one of those trannys as well. Shame the 4.3 won't bolt up to it.
All bolt in.
But if I had my choice I'd like to be able to bolt an MUA5 to the back of a Toyota 4L like is in my wifes 4 Runner. We can't kill that motor and it's a hoss when it comes to pullinmg stuff.
 
Last edited:

IowaOffRoad

Practical Engineer
Joined
Feb 19, 2021
Member Number
3513
Messages
495
Loc
SW Iowa
In order to bolt up an MUA5 to a C223 you need the front half of thr transmission that came behind that engine. The front half is basically the diesel bell housing & the front case half of the tranny. A 4 speed IIRC. The MUA5 and the earlier 86 trannys use the same gear box configuration. Just different bell housings cast on them. And yes they are interchangeable. I have 2 of them. Both bolted to MUA5 thransmissions. I run the diesel flywheel and Gasser clutch plate.
I have a picture of one of them on another computer if you'd like to see one.

The MUA5 also came with the bolt pattern for a 2.8 & 3.2 GM front wheel drive engines. Early Cmeroes used the 3.2 motors BTY! And the rare Pontiac 3.8L motor. But that's another whole can of worms to open. I've got one of those trannys as well. Shame the 4.3 won't bolt up to it.

But if I had my choice I'd like to be able to bolt an MUA5 to the back of a Toyota 4L like is in my wifes 4 Runner. We can't kill that motor and it's a hoss when it comes to pullinmg stuff.
I have multiples of the MSG transmission front case/integral bellhousings. I had no idea that the MUA5 was so similar that you could use that case to adapt it. I know between the gas and diesel cases the front bearing size changed on the MSG depending on year, are there similar differences between the MSG and the MUA?
I was under the impression that the MUA was a slightly stronger transmission than the MSG. If the front case sections can be swapped, what exactly did they change? I've gotten way too good at pulling down all the MSG's I've had over the years in DD vehicles and building franken transmissions out of 2 or three depending on what failed. Trying to avoid this when swapping a diesel into my '95 Isuzu. It's got 200k on the original trans now and it still shifts great and doesn't make noise. I've had the old MSGs make noise when they had 135k on them.
 

KungFooMASTA

El Stupido
Joined
May 19, 2020
Member Number
361
Messages
972
Loc
17 miles West of Murdock KS
In order to bolt up an MUA5 to a C223 you need the front half of thr transmission that came behind that engine. The front half is basically the diesel bell housing & the front case half of the tranny. A 4 speed IIRC. The MUA5 and the earlier 86 trannys use the same gear box configuration. Just different bell housings cast on them. And yes they are interchangeable. I have 2 of them. Both bolted to MUA5 thransmissions. I run the diesel flywheel and Gasser clutch plate.
I have a picture of one of them on another computer if you'd like to see one.

The MUA5 also came with the bolt pattern for a 2.8 & 3.2 GM front wheel drive engines. Early Cameroes used the 3.2 motors BTY! And the rare Pontiac 3.8L motor. But that's another whole can of worms to open. I've got one of those trannys as well. Shame the 4.3 won't bolt up to it.
All bolt in.
But if I had my choice I'd like to be able to bolt an MUA5 to the back of a Toyota 4L like is in my wifes 4 Runner. We can't kill that motor and it's a hoss when it comes to pullinmg stuff.
Yeah make with the pics!
 
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