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Old 11-20-2007, 02:05 PM   #1
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MM5 Manual Transmission

It's about time for me to get my Xtreme parked for the winter. I've been working on getting my newest S-10 acquisition ready for the road. It's a 1989 2WD regular cab with a 5 speed manual trans. Right now, the transmission has got Dexron ATF in it, but I'm wondering if this is correct. The owners manual that I got with the truck does not have a listing for the MM5 transmission that is in it. Can anybody tell me if Dexron is the right fluid for it ... or should it use gear lube?
Old 11-20-2007, 02:28 PM   #2
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Re: MM5 Manual Transmission

mm5? what is that?

the only manual transmissions in 91 are the T5 and the NV3500


2.5/2.8 have the T5 in them and it does take atf

the 4.3 has the NV3500 and it takes sycromesch
Old 11-20-2007, 03:33 PM   #3
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Re: MM5 Manual Transmission

Quote: Originally Posted by 95 S_Trucker
mm5? what is that?

the only manual transmissions in 91 are the T5 and the NV3500


2.5/2.8 have the T5 in them and it does take atf

the 4.3 has the NV3500 and it takes sycromesch
MM5 is the RPO code for the transmission. There are 4 different RPO codes listed in the owner's manual for the 5 speed manual trans. One takes gear lube, and the other 3 take ATF. My only dilemma is that the MM5 RPO code is not listed in the owner's manual at all so I don't know which fluid I should use. The only reason that this is a question is that I'm hearing a nasty growling noise when the truck is moving, and if it's supposed to have gear lube in it, then I can understand why.
Old 11-20-2007, 07:35 PM   #4
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Re: MM5 Manual Transmission

some of the t-5 trannys use the sycromesch oil. That is what i am going to use in mine when i replace the clutch. by the way that shit is expensive, over 10 bucks a quart.
Old 11-20-2007, 11:40 PM   #5
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Re: MM5 Manual Transmission

keep the ATF
Old 11-20-2007, 11:42 PM   #6
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Re: MM5 Manual Transmission

the MM5 RPO is for manual 5-spd equipment, like pedals,master cyl., slave cyl. etc.
Old 01-14-2010, 10:11 AM   #7
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Re: MM5 Manual Transmission

would it hurt to run dextron atf with the nv3500?
Old 07-06-2010, 10:08 AM   #8
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Re: MM5 Manual Transmission

I have the same RPO code and it also says MY2 when I called the dealership the guy could not tell me which transmission by the codes. He said to climb under the truck and look for a tag?
Old 07-06-2010, 02:18 PM   #9
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Re: MM5 Manual Transmission

wat transmission would my 1983 4x4, 4 or 5spd be? its a 2.8v6
Old 07-07-2010, 07:05 PM   #10
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Re: MM5 Manual Transmission

Quote: Originally Posted by 4x4muddevil
wat transmission would my 1983 4x4, 4 or 5spd be? its a 2.8v6
t5 i believe
Old 08-09-2011, 08:51 PM   #11
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Re: MM5 Manual Transmission

http://en.wikipedia.org/wiki/New_Ven...0_transmission
Old 08-10-2011, 11:32 AM   #12
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Re: MM5 Manual Transmission

I'm really tired of recommending this:
Honda makes a tranny juice for their manual trannys that is magic. It is a little thicker than ATF and is almost clear. I have 3 dimes with 5 speeds (T5s) and have installed this stuff in each one. It reduced grinding and my '91 goes to the drags pretty regularly. I can beat the synchros most of the time when I power shift, but it is alot less pronounced now.
Anyway, it's about $8/qt IIRC and it really works. I also would recommend adding a 1/2 QT of Lucas oil additive. This stuff also works well. It sticks to moving parts.
Old 08-26-2011, 09:59 AM   #13
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Re: MM5 Manual Transmission

Is this a NV3500? and if it is not, what kind is it? I got it with a 2.5 liter from another S-10. Any factual identification will be a plus, as this is the tranny I'm planning on stuffing in my dime.
Attached Thumbnails
MM5 Manual Transmission-sdc10361.jpg   MM5 Manual Transmission-sdc10362.jpg   MM5 Manual Transmission-sdc10363.jpg   MM5 Manual Transmission-sdc10360.jpg  
Old 10-06-2011, 12:44 PM   #14
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Re: MM5 Manual Transmission

C'mon folks. I would really like an answer to this, short of loading it up and hauling it to a transmission shop to get it ID'd.

This is the one I plan on stuffing into my dime, and will need a positive ID to get the adapter to switch to a electric speedo.

Please help me out. All of the photos I found on the web do NOT have clear enough photos to match this with.


PLEASE HELP ID THIS TRANNY!!!!!!!
Old 10-06-2011, 01:18 PM   #15
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Re: MM5 Manual Transmission

its def not an nv3500, slave is on the wrong side, almost want to say its not a t5 cause the bell housing isnt removable, and its not an nv1500 cause the starters on the wrong side... so i dunno
Old 10-06-2011, 11:47 PM   #16
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Re: MM5 Manual Transmission

2nd pic is an isuzu logo... wouldn't be surprised if that went with the isuzu diesel powered s10 they sold in the mid 80's (1.9, 2.0, 2.2l)
Old 10-08-2011, 04:05 PM   #17
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Re: MM5 Manual Transmission

Quote: Originally Posted by dadmoonbunny
Is this a NV3500? and if it is not, what kind is it? I got it with a 2.5 liter from another S-10. Any factual identification will be a plus, as this is the tranny I'm planning on stuffing in my dime.
More than likely it's the izuzu 4 speed . us cheap guys that would only pay for the base trucks got those .

While pretty much indestructible the gear ratio selection in them things were...... not optimal .

And as I recall , it ran ATF.
Old 08-27-2012, 05:05 PM   #18
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Re: MM5 Manual Transmission

short of loading it up and hauling it to a transmission shop to get it ID'd.

look up the id# online
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