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Finally got all the parts together for my '78 and dropped in the 5 speed but Im not sure what kind of oil it takes. When I drove it for the first time with the 5 speed I used gear oil. It was I think 80w90w or somthin like that and it was smooth and shifted real well. I did some searching about what kind of oil it takes and saw that it takes SAE 30 so I swaped it out right away. Now when I drive it feels rough and it shifts harder. So does anybody know what kind of oil the MAU5 takes?

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1975 V8 Luv
1980 Bagged Luv

MUA-5 takes 90w I believe (thats what I've put in mine since we got it and it's running just fine with 225,000+ miles on it)

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'80 Luv 4x4, 3" BL, 1.5" SL, 32/36, 2.25" exhaust...and fuzzy dice.
'95 Toyota 4Runner Limited 5-Speed.

you and your five speeds...



anyways, i run 30W in my tranny, but its a 4 speed from a 77 luv, so that dont help ya at all... lol

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"but its that gut feeling of you're drawn to what feels right for yourself and what you're passionate about..."

awwww is Neil jealous about not having a 5-speed??

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'80 Luv 4x4, 3" BL, 1.5" SL, 32/36, 2.25" exhaust...and fuzzy dice.
'95 Toyota 4Runner Limited 5-Speed.

yeah, i am

dont want to hijack the thread, but dan, what did you do for the driveline on the truck? how much longer is the 5 speed than the 4 speed?

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"but its that gut feeling of you're drawn to what feels right for yourself and what you're passionate about..."

I thought the MUA was the same as the MSG. Just 30 or 40 weight oil. Could be wrong.

The reason for using the lighter oil is that with the heavy gear the syncros drag and make shifting hard.


Bob.

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Current project, 1979 KB Isuzu Ute.

Daily driver, '86 Rodeo Spacecab.
Chasing parts for Isuzu Impulse.

That is what I thought as well. I've run 90W in an MSG for quite a while though with no ill effects. I think unless you are in a very cold climate 90W would be fine. The only real difference I noticed was a little stiffer shifting on the 90W, but it was quieter running.

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95 Isuzu Trooper Daily Driver
86 Isuzu Trooper reliable backup
77 LUV 2wd stock beltway blaster (resting)
79 4x4 LUV project: 2.6L, 5spd, 31s (eventually)

MEPR: Man, my 4x4 makes all other LUVs look good

I had to get the driveshaft shortened about 2 inches and I re used the slip yoke from the auto. Even the trans mount lined up using the autos crossmember mount. So the MAU5 is about 2 inches longer then the auto. I dont have a MSG so I couldn't tell ya the difference.....sorry

For the oil I think Im going to go with the 90w.

Thanks for your help everybody!

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1975 V8 Luv
1980 Bagged Luv

All the Isuzu trannies i have seen recomend 30wieght. That said my Troopper and my Luv both have 80w90 in the tranny. The lighter oil is realy just for trying to eek out some more economy through less oil resistance...

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1980 LUV 4x4, going under re-construction...

Cant say i agree 100%.

Ive had 90w in my box, had to drain it, near impossible to shift gear till things got real hot.


In the noisy box i shandied it up half and half filled near to the top, got a bit more life out of it.


Bob.

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Current project, 1979 KB Isuzu Ute.

Daily driver, '86 Rodeo Spacecab.
Chasing parts for Isuzu Impulse.

Try going to your local motorcycle shop and get some Bel Ray motorcycle trans 80-90 oil and put it in.It is classed 80-90 but is lighter and a whole lot slicker and it works. I have it in my t-10 in my truck and have used it many time in t-5s as wall as in a couple of VW trans. Its just a thought but you will like the slick shifting and the durability.

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1978 pro street step/side 455Buick, 4sp,4.11s, 31/18.5s

Well last night I was looking around at my dads shop and found a few barrels of synthetic SAE50 trans fluid for the semi's. I took a gallon home with me and put it in the '78 and it is alot better now. The weight of the oil is right in between so I'm happy with it now. Thanks for your help guys!

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1975 V8 Luv
1980 Bagged Luv

Thats the special gear for the eaton fuller road ranger boxes. I never thought to use that stuff. If i remember right its not cheap either as its synthetic.


Bob.

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Current project, 1979 KB Isuzu Ute.

Daily driver, '86 Rodeo Spacecab.
Chasing parts for Isuzu Impulse.