Can anyone verify for me if the 3.42 gear set-up (complete unit) is identical on a MN6 and an A4?

I have an '02 automatic coupe with 2.73s and would like to upgrade to 3.42s. My question is, if I find a 3.42 from a MN6. will it be a simple exchange to my A4?

I do realize that there will be a programming change to go from 2.73 to 3.42.

Thanks

:auto:

 

I'm not positive but I think they are the same unit. I'm sure someone will chime in and either confirm that or let us know what the difference might be. :cheers:

 

they are the same.

But the Z06 3.42 is different then the MN6 3.42. The Z06 carrier has shot-peened parts to handle the increased power.

 

"I do realize that there will be a programming change to go from 2.73 to 3.42."

Hey Mike M. , I'm surprised you did not explain to him the ins & outs of shift points reprogramming :lolg:

 

Now, you guys need to be nice on my thread! I have followed both of your comments on various topics, and I respect your knowledge and appreciate your help. Just remember, "Kill 'em with kindness"!

:auto:

 

Sorry, it was too tempting, but seriously Mike Mercury knows far more than me about these awesome Vettes. I just wish he'd cut a brutha some slack. :seeya

 

Cary; to quote a line from a funny move:

Lighten up, Francis :)

 

:lolg: :withstupid: :thumbs:

Cary

 

Yes, the 6 speed 3.42 will fit your A4 like it was made for it. Just go ahead and DO IT...

 

Make sure you take the car to a reputable shop to get the gears changed. Not only so that you can be sure that they will take good care of your car, but also because setting up rear end gears can be quite difficult. Unless you have prior experience with setting up gears yourself, its best to leave this to a professional. There is nothing more annoying than driving a car that has a lot of gear noise because they weren't set up correctly.

Good luck. The 2.73->3.42 gear swap was a great mod when I did it to my T/A.

 

or you can just buy a new Getrag 3.42 carrier complete.You can get them brand new for around $900; If your Vette already had the 3.15 you could sell it for at least $400.

Used 2.73 carriers have no value that I know of. :(

.


[Modified by Mike Mercury, 4:54 PM 5/21/2003]

 

:withstupid: I was told that it is best to change the complete rear diff assembly, so I have to agree with MM on this one :eek:

 

QUOTE
or you can just buy a new Getrag 3.42 carrier complete.You can get them brand new for around $900; If your Vette already had the 3.15 you could sell it for at least $400.

Used 2.73 carriers have no value that I know of. :(

.


:iagree: :iagree: :iagree: BUY THE COMPLETE CARRIER

 

Since we're on the subject, how do I find out what gears are in my '97? I didn't buy it new, so I don't know if there has been a swap.

Sorry for the distraction, but I think the original question was answered pretty well.
:chevy

 

The way I found out on my 2001 was by the codes on the label of the inside glovebox door.

Cary

 

Or do it mike's way if you do not find the numbers. Something about 3rd gear and 75 mph. Rpm will tell you what gears. Do you want to explain it Mike?
I think it is on Mike's site. :)

 

........................................ ......................

Or, look at your option list. If you look in your glove box there is a sticker with all codes on the inside of the glove box door. The 3.15 performance axle ratio option is code G92. For '99 and earlier it should be listed on the underside of the left-hand storage well cover:
*Go To http://mikemercury.home.att.net/ratio.htm For PIC

C. Or... place your A4 into third gear and get on the highway. At a constant 75mph (making sure the TC has locked) read the rpm value; then divide it by 1000.
examples:
2730 RPM........ you have a 2.73
3150 RPM........ you have a 3.15
3420 RPM........ you have a 3.42 (not a factory available ratio with the A4)
3730 RPM........ you have a 3.73 (not a factory available ratio)
3900 RPM........ you have a 3.90 (not a factory available ratio)
4100 RPM........ you have a 4.10 (not a factory available ratio)

The key is third gear, driving at a constant 75mph. AND, you must be using the same rear tire height as the factory installed tires.
With this method, you don't need a chart to compare your rpm/mph to. Just divide the RPM by 1000. This also works with the six speed manual transmission using 4th gear (again with identical tire height as from the factory).

*The above is a copy&paste directly from MM's site*

Well, I think it would be much easier to look in the glove box, but I do not know for '99 & earlier where the underside of the left-hand storage well cover.


Cary





[Modified by Cary, 9:20 PM 5/21/2003]

 

:thumbs:

 

Yea, MM & I are Buds :lol:

Cary

 

read about it here:

mikemercury.home.att.net/ratio.htm

it boils down to:

A4 - drive 75mph in 3rd gear with TC locked. Divide RPM by 1000

6 speed - drive 75mph in 4th gear. Divide RPM by 1000

this asumes the rear tire heigth is stock.