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Apr 2, 2007 | 10:32 PM

#81

CFI-EFI

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From: The Top of Utah

Quote:

Originally Posted by Jeffvette

Yea because GM has never ever reused a RPO option.

You quit reading too soon.

Quote:

Originally Posted by EFI-CFI

We know that RPOs do sometimes get reused, but only after a lengthy hiatus, like the LT1 engine.

Apr 2, 2007 | 10:44 PM

#82

Jeffvette

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From: No more yankee my wankee, the Donger is tired!

And Z51 took a hiatus in 91-95 as well, but in came back in 96. Quite a length of time there. And was used in the C5 and C6.

Apr 2, 2007 | 10:47 PM

#83

CentralCoaster

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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed

MN6 says "put the damn provisions in for a 6-speed transmission"

There's nothing specific about trans type. There's no reason it could not be rolled over to the C5, or a 1-ton delivery van.

Apr 2, 2007 | 10:54 PM

#84

Z-07 freak

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From: Why are there squished peanut butter cups in my underware?

Quote:

Originally Posted by Jeffvette

And Z51 took a hiatus in 91-95 as well,

That's because it was replaced by the greatest RPO ever.

Apr 2, 2007 | 10:58 PM

#85

SurfnSun

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St. Jude Donor '10

If MN6 ≠ 6 speed manual transmission, then why do F-bodies use the same RPO but get a different tranny?

Hmmmmm

From CamaroZ28.com- 1997 RPO list.

MM6 Transmission, Manual, 6-Speed, Borg-Warner, 85mm, 2.66 1st, 0.50 6th, O/D
MN6 Transmission, 6-Speed Manual (Merchandising Option)

Looks like C5's do the same thing. Im sure its all speculation tho

Im guessing the system dates back to the 60's when you had multiple manual transmission options.

So lets use some logic, break this down, and put it to bed.

C4 = MN6 + ML9 = ZF6
C5 = MN6 + MM6 = T56
Fbody = MN6 + MM6 = T56.

Anyone seeing a pattern here?

Quote:

MN6 is generally accepted as the 6 speed option code. ML9 was the trans designation.

Last edited by SurfnSun; Apr 2, 2007 at 11:02 PM.

Apr 2, 2007 | 11:03 PM

#86

CentralCoaster

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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed

Quote:

Originally Posted by SurfnSun

If MN6 ≠ 6 speed manual transmission, then why do F-bodies use the same RPO but get a different tranny?

Who ever said MN6 ≠ 6 speed manual transmission?

Any 6-speed GM car over that time period should be a MN6 car, because they all have provisions for a 6-speed.

Apr 2, 2007 | 11:04 PM

#87

CentralCoaster

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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed

Quote:

Originally Posted by SurfnSun

C4 = MN6 + ML9 = ZF6
C5 = MN6 + MM6 = T56
Fbody = MN6 + MM6 = T56.

Anyone seeing a pattern here?

Yeah, the pattern I see, is MN6 is not the RPO for the ZF6. So tell me how CFI was wrong?

Apr 2, 2007 | 11:07 PM

#88

SurfnSun

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St. Jude Donor '10

Quote:

Originally Posted by CentralCoaster

Who ever said MN6 ≠ 6 speed manual transmission?

Any 6-speed GM car over that time period should be a MN6 car, because they all have provisions for a 6-speed.

That would be CFI-EFI. He's been saying it all along in a very non-commital way (see second quote). Then when I thought we'd agreed he said " speculation"

Quote:

ML9 is the RPO for the C4 six speed. Notice, there is no MN6 on the RPO sheet. As I said, I admit, I have no idea what MN6 is a reference to. I just know the RPO code for the six speed.

Quote:

As I stated, POSSIBLY, MN6 designates a six speed in general, but that has not been shown.

In my mind it has been show based on the pattern i showed.

Last edited by SurfnSun; Apr 2, 2007 at 11:14 PM.

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Apr 2, 2007 | 11:11 PM

#89

SurfnSun

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St. Jude Donor '10

Quote:

Originally Posted by CentralCoaster

Yeah, the pattern I see, is MN6 is not the RPO for the ZF6. So tell me how CFI was wrong?

He said that MN6 was not the RPO code for a 6 speed.

That is an incorrect statement.

Apr 2, 2007 | 11:19 PM

#90

89onlyZ51

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From: Seattle WA

Quote:

Originally Posted by SurfnSun

Like I said....go find a console tag of a 6 speed car. You'll see MN6 on there...regardless if you like it or not. I have a pic from a 90 car, I just need to find an 89.

My '89 has MN6, no ZF6 on the sticker. (oh yeah, and it's a real Z51 w/o FX3 - boy, those springs are STIFF!)

Apr 2, 2007 | 11:30 PM

#91

bogus

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From: San Pedro CA

My final thought on this subject:

CFI-EFI is correct.

So are the rest of us.

MN6 refers to a 6spd. That's all that matters.

ML9 refers to WHICH 6spd, in this case, the ZF6.

ZF6 is just just shorthand for the ZF 6 spd manual. I dare ANYONE to find this info on an RPO list or decal.

I come back to what I said a few posts ago, the way the C4 was built, the body assembly was built on one line, and mated to the driveline. So the body folks would need to know which pedal set and CCM to install.

I think it's time for this thread to be locked.

Last edited by bogus; Apr 3, 2007 at 10:52 AM. Reason: typo

Apr 2, 2007 | 11:41 PM

#92

JD'S WHITE 93

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Quote:

Originally Posted by SurfnSun

He said that MN6 was not the RPO code for a 6 speed.

That is an incorrect statement.

MN6 is not the RPO code for the six speed transmission. MN6 MAY very well be an RPO code on six speed Corvettes however it is not the RPO code for the transmission. I THINK what has happened is this. THIS IS MY SPECUALTION, ML9 is the RPO code for the trans yet the cars must have RPO MN6 as well for the car to be a functional six speed so MN6 is often used as the RPO code for the six speed cars and it is printed in books such as Corvette specs etc. You can not argue with GM they built the cars and per their info ML9 is the RPO for the six speed not MN6.

Last edited by JD'S WHITE 93; Apr 2, 2007 at 11:44 PM.

Apr 3, 2007 | 01:05 AM

#93

Z-07 freak

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From: Why are there squished peanut butter cups in my underware?

Since we are now repeating ourselves... T56 sucks.

Apr 3, 2007 | 01:33 AM

#94

CentralCoaster

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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed

Quote:

Originally Posted by SurfnSun

He said that MN6 was not the RPO code for a 6 speed.

Either you suck at reading comprehension, or I do. I don't see that anywhere in his posts. Why don't you enlighten us.

Apr 3, 2007 | 01:44 AM

#95

zr1fred

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From: Phoenix Arizona

Try post #40

Apr 3, 2007 | 01:51 AM

#96

CentralCoaster

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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed

Quote:

Originally Posted by zr1fred

Try post #40

I called up Mr. LaForge from reading rainbow and he wasn't able to see it either, even with his high tech visor.

Apr 3, 2007 | 02:31 AM

#97

CentralCoaster

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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed

Quote:

Originally Posted by bogus

My final thought on this subject:

CFI-EFI is correct.

So are the rest of us.

The thread starter asked what the option code for the ZF was. CFI was 100% right and "the rest of you" weren't, and no matter how much you hate that fact, or the technicalities of it, he was right.

Ask me why I care. Because some of you shoveled s*** in his face and went Lord of the Flies on him when you thought he was wrong.

I have the luxury of saying this because while I thought I knew the answer, I wasn't sure, and didn't try to shove it down anyone's throat.

What are any of you defending? All the facts are there in plain sight now.

Apr 3, 2007 | 07:36 AM

#98

Mr Mojo

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Quote:

Originally Posted by CFI-EFI

If that is what it says, then it is self contradicting. I believe, correct me if I'm wrong, that 1997 and up Corvettes don't use the ZF trans. Therefore, based on the definition above, the MN6 can't be the 1997-2004 six speed trans.

I don't agree with this. True the C5 did not use the ZF. I think it boils down to the same thing as the G92 RPO which is for the performance axle ratio, but there is a different RPO for the actual gear ratio. So MN6 is used to designate the six speed and a different code is for exactly whichtrans is being used.(which I do believe you have mentioned already)

Quote:

That squares with the MX0 as a merchandising designation or option as MX0 doesn't specify the number of speeds of the automatic overdrive trans. We know that RPOs do sometimes get reused, but only after a lengthy hiatus, like the LT1 engine. MX0 wouldn't be the RPO for a 4 speed auto one year and a 6 speed the next. Both those transmissions would have their own, specific RPO numbers, like the ML9 does.

RACE ON!!!

I agree with this, the MXO would be the code for an automatic and a different RPO for the actual trans. I have to do more research on that because I thought both the 4 and 6 speed autos were available at teh same time. I don't know if the 4 was replaced by the 6 or not.

Apr 3, 2007 | 08:38 AM

#99

SurfnSun

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St. Jude Donor '10

Quote:

Originally Posted by Mr Mojo

So MN6 is used to designate the six speed and a different code is for exactly whichtrans is being used.(which I do believe you have mentioned already)

It worked the same way with B2k's. If you ordered a B2K, it triggered build code Z5G automatically. You had no choice.

Apr 3, 2007 | 08:44 AM

#100

SurfnSun

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St. Jude Donor '10

Quote:

Originally Posted by CentralCoaster

Either you suck at reading comprehension, or I do. I don't see that anywhere in his posts. Why don't you enlighten us.

here it is as I see it.

In my mind its a technicality, but if you want to be absolutely correct then terminology is an issue.

Quote:

Originally Posted by CFI-EFI

I have no idea what MN6 is a reference to. I just know the RPO code for the six speed.

I hope you can see where Im going from here.

MN6(the six speed option code) triggers ML9(the ZF trans). I never said he wasn't correct about ML9 being ZF.

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