BlackDuk98

iTrader: (34)

--------------------------------------------------------------------------------

Hi. This spring I am installing a th400 w/ part manual shift kit (will hold whatever gear I select, or put it in "D" and drive like normal auto) I have a speed ring installed on the output shaft w/ a speed sensor so I can have my speedometer working. Does the connector on the th400 speed sensor mate w/ the connector on the factory wiring harness connector that goes to the 4l60e speed sensor? Also adding a kickdown switch and a 3600 stall converter and Moser 9" also.

This is going in a 1998 TA

I have read that you have your pcm tuned to have the tranny parameters for an M6 car and remove all the 4l60e stuff. So this means that the car will no longer have any idea what stall I am running. And the computer won't know what speed I am going anymore. I think?

The Moser rear has nothing for ABS so I will have that light on.

Now, can I have the 4l60e stuff removed from the pcm, and the M6 info put in place, and still run the car w/ a 4l60e w/ the sensors all hooked up for awile? Or do I have to do this after I swap everything?

If I swap everything before I have the pcm adjusted (still have the 4l60e info on it) can I drive my car around awhile with my non computer controlled th400, 3600 stall and new gear ratio (4.11’s)? Will the computer keep looking for the stall, speed and gearing and possibly put it in limp mode? I apologize for being very uneducated in pcm tuning. That is the next step I will be focusing on. I know someone local who has done this tuning and will be doing this for me. If there is anything else I should get changed on the pcm, what would it be?

Thanks for any info. I appreciate it.

Mark Jr.
__________________

9000th01ss

iTrader: (10)

Have someone tune it.
An M6 trans tune isn't going to look for gear, rpm, stall speed, codes can be deleted.

As far as I remember the speed sensor plugs right in, if not just cut and splice.

Yes, the only difference that would matter is the speed sensor reluctor wheel tooth count. With an M6 tune, and the speedo set for a 40 tooth wheel should run.

Leaving the stock A4 tune in I would imagine is going to cause a few problems, I don't see why you could not try it. You have the 40 tooth speedo wheel so it's going to get the correct mph reading.
Other than that it's going to be throwing codes for missing A4 sensors, etc.

BlackDuk98

iTrader: (34)

thanks for the info. That is what I thought, but I figured that I better verify it before I go ahead and start the project. Now with the pcm tuning, do you have to program the computer to let it know that you have a 40 tooth wheel? Or is the speedometer completely seperate from pcm inputs?

thanks

mark jr.

9000th01ss

iTrader: (10)

It is all in the ecm programming. LS1 A4's come with the same reluctor wheel as the th400 should have, 40 tooth.
The M6 cars come with a 17 tooth.

So you should be able to run it for a little while with the A4 tune, most things other than transmission stuff reference the VSS. So basically you're not changing the VSS signal so it all should remain the same.

TurboAv

iTrader: (6)

I am having an issue right now with swapping out my M6 for a TH400. My speedo is over 25mph off. I've got a 40 tooth reluctor now and even though the computer is seeing the true speed. IE 75mph actual is what the computer sees, but the cluster reads 105. I don't know if there is a difference in the tunes between M6 and A4, but I suspect there is. I may just have a custom 17 tooth reluctor made. I also may try converting my tune to a A4 tune and deleting all the codes.

Good Luck.

BlackDuk98

iTrader: (34)

Ok, I got it now. Thanks for the clarification. I'm just trying to get every aspect of the swap worked out so it will be a flawless transition when I swap everything in spring. By any chance, did you use a stock a4 shifter? I'm not 100% on if I can use the factory linkage / cable, or if there is any modifications that I need to make to it. I also need to figure out about when using a m6 crossmember and 1 inch spacer, am I to use a stock th400 mount, or a 4l60e mount? I have read through the stickies many times, but I have found some things in it that aren't exact, so I would rather ask others.

thanks for the help

mark jr.

9000th01ss

iTrader: (10)

I never did the swap into a 4th gen. I just know how it all works.
I've done an A4 to M6 swap, and used HPTuners to get that right. Gear swaps, etc. It's all pretty much the same.

BlackDuk98

iTrader: (34)

Well, it all sounds pretty easy. I have never messed w/ hp tuners nor do I own it. So I will be having the local guy I know do it. I was under the impression that w/ a gear swap and since I will have this tuned as an M6, that there is nothing to tune for gearing? I am going from and a 3-channel 10 bolt w/ 3.23's to a no-channel 9" w/ 4.11's. I am keeping the same size tires on for a while (26") For little stuff like tire size and reading codes, I have a crappy hypertech programmer that came w/ the car. I couldn't sell it, so it's my code reader

thanks

mark jr.