MM5 Manual Transmission

S10Xtremeist · 11-20-2007, 02:05 PM

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?

95 S_Trucker · 11-20-2007, 02:28 PM

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

S10Xtremeist · 11-20-2007, 03:33 PM

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.

blazin24 · 11-20-2007, 07:35 PM

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.

dimerunner88 · 11-20-2007, 11:40 PM

keep the ATF

dimerunner88 · 11-20-2007, 11:42 PM

the MM5 RPO is for manual 5-spd equipment, like pedals,master cyl., slave cyl. etc.

woohoooo964x4 · 01-14-2010, 10:11 AM

would it hurt to run dextron atf with the nv3500?

markinnh · 07-06-2010, 10:08 AM

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?

4x4muddevil · 07-06-2010, 02:18 PM

wat transmission would my 1983 4x4, 4 or 5spd be? its a 2.8v6

cstiles · 07-07-2010, 07:05 PM

Quote: Originally Posted by 4x4muddevil

wat transmission would my 1983 4x4, 4 or 5spd be? its a 2.8v6

t5 i believe

markinnh · 08-09-2011, 08:51 PM

http://en.wikipedia.org/wiki/New_Ven...0_transmission

Mad Max · 08-10-2011, 11:32 AM

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.

dadmoonbunny · 08-26-2011, 09:59 AM

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.

dadmoonbunny · 10-06-2011, 12:44 PM

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!!!!!!!

Dragonball98312 · 10-06-2011, 01:18 PM

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

donalson · 10-06-2011, 11:47 PM

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)

ratdude · 10-08-2011, 04:05 PM

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.

steveh · 08-27-2012, 05:05 PM

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

look up the id# online

11-20-2007, 02:05 PM	#1
S10Xtremeist Registered User Age: 38 Join Date: Oct 2007 Posts: 5 Location: User is: OffLine	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?
	[Reply w/Quote]

11-20-2007, 02:28 PM	#2
95 S_Trucker no longer has a 95 Age: 23 Join Date: Jan 2007 Posts: 1,826 Location: Lancaster, PA User is: OffLine	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
	[Reply w/Quote]

11-20-2007, 03:33 PM	#3
S10Xtremeist Registered User Age: 38 Join Date: Oct 2007 Posts: 5 Location: User is: OffLine	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.
	[Reply w/Quote]

11-20-2007, 07:35 PM	#4
blazin24 NOT DONE TO MANY PROBLEMS Age: 23 Join Date: Dec 2005 Posts: 1,566 Location: St. Johns, MI User is: OffLine	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.
	[Reply w/Quote]

11-20-2007, 11:40 PM	#5
dimerunner88 whore turned lurker Age: 26 Join Date: Jan 2007 Posts: 20,859 Location: Clay City,IN User is: OffLine	Re: MM5 Manual Transmission keep the ATF
	[Reply w/Quote]

11-20-2007, 11:42 PM	#6
dimerunner88 whore turned lurker Age: 26 Join Date: Jan 2007 Posts: 20,859 Location: Clay City,IN User is: OffLine	Re: MM5 Manual Transmission the MM5 RPO is for manual 5-spd equipment, like pedals,master cyl., slave cyl. etc.
	[Reply w/Quote]

01-14-2010, 10:11 AM	#7
woohoooo964x4 Registered User Age: 21 Join Date: Nov 2009 Posts: 47 Location: User is: OffLine	Re: MM5 Manual Transmission would it hurt to run dextron atf with the nv3500?
	[Reply w/Quote]

07-06-2010, 10:08 AM	#8
markinnh Registered User Age: 49 Join Date: Jun 2010 Posts: 73 Location: User is: OffLine	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?
	[Reply w/Quote]

07-06-2010, 02:18 PM	#9
4x4muddevil 4x4muddevil Age: 23 Join Date: Jul 2009 Posts: 335 Location: hawaii User is: OffLine	Re: MM5 Manual Transmission wat transmission would my 1983 4x4, 4 or 5spd be? its a 2.8v6
	[Reply w/Quote]

07-07-2010, 07:05 PM	#10
cstiles Registered User Age: 23 Join Date: May 2010 Posts: 251 Location: middle tn User is: OffLine	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
	[Reply w/Quote]

08-09-2011, 08:51 PM	#11
markinnh Registered User Age: 49 Join Date: Jun 2010 Posts: 73 Location: User is: OffLine	Re: MM5 Manual Transmission http://en.wikipedia.org/wiki/New_Ven...0_transmission
	[Reply w/Quote]

08-10-2011, 11:32 AM	#12
Mad Max Boozebag Join Date: Jun 2009 Posts: 2,594 Location: Baton Rouge, LA User is: OffLine	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.
	[Reply w/Quote]

08-26-2011, 09:59 AM	#13
dadmoonbunny Registered User Join Date: Mar 2011 Posts: 77 Location: User is: OffLine	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
	[Reply w/Quote]

10-06-2011, 12:44 PM	#14
dadmoonbunny Registered User Join Date: Mar 2011 Posts: 77 Location: User is: OffLine	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!!!!!!!
	[Reply w/Quote]

10-06-2011, 01:18 PM	#15
Dragonball98312 Super Saiyan User Age: 27 Join Date: Jan 2007 Posts: 556 Location: Bremerton WA User is: OffLine	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
	[Reply w/Quote]

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10-06-2011, 11:47 PM	#16
donalson Registered User Age: 33 Join Date: May 2007 Posts: 410 Location: Webster, TX User is: OffLine	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)
	[Reply w/Quote]

10-08-2011, 04:05 PM	#17
ratdude Registered User Join Date: Apr 2009 Posts: 152 Location: User is: OffLine	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.
	[Reply w/Quote]

08-27-2012, 05:05 PM	#18
steveh Registered User Join Date: Aug 2012 Posts: 2 Location: User is: OffLine	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
	[Reply w/Quote]