Transmission question for 2003 SSEi

[rynmcdonald]

I recently visited the wrecking yard in search of an MN7 trans with FR2 ratio code. I DID find one, but it was in a Monte Carlo. Only problem is that it doesn't have the webbing that it's supposed to with SC engines. First I had my hopes up and wanted to get the unit, but after checking for the webbing my heart sunk and I was like

Can I use this unit or no? I hear that if the 4T65e unit doesn't have the webbing there it is suceptible to fracture. Need clarification here as I can be heavy footed at times and wouldn't want a broken case.

[buickman104]

You ABSOLUTELY need a transmission case with the webbing. The W bodies (mote carlo) don't need it because they lack a rear trans or engine mount.

[rynmcdonald]

So how then does a Monte Carlo support its transmission? Tension arms on the front of the engine? Wonder if I ise a chain and latch down my engine that way.

[rynmcdonald]

Wonder if I could put a 4T80e in this car and call it good after having the ECM tuned to the respective ratio of the transmission I get. 3.11:1 would be my choice.

[2003 SSEi]

no the 80 is not a direct swap. While it would bolt up, you no need to make a brackets, and then have some one Tune it.

It would cost way more in the long run than to just get the correct 65

[nos4blood70]

If only the 80 could swap in without any extra work... Yay for indestructo trans.

[rynmcdonald]

Why can't I just use the transmission out of the donor car that I have? It is a 2002 Grand Prix GTP. I know that the transmission will have a big pressure switch manifold but I am wondering if the computer can just swap over and it will work.

[Jrs3800]

Did you miss the part about the W body Trans not have the webbing for the rear trans mount? The GTP does not have the structural webbing for the rear mount used on the H body..

The front of the H body does not have the support for the Dog Bones.. So I don't know what you would do there..

Spend a little now, or a lot later..

Maybe transfer the guts from one trans to another?

[nos4blood70]

Maybe transfer the guts from one trans to another?

Consider this. They are the same internally, except for the casing. Luckily all L67s got the 2.93 gearing.

[rynmcdonald]

This guy apparently did a 4t80e swap on a 3.8 ssei.

http://www.gmls4.com/index.php?topic=1015.0

[crash93ssei]

That was on a '96 - '99, different mounts to begin with. Though the 4T80E did come stock in the Bonneville GXP, this is still way more then you want to tackle especially for a stock or even mildly modded L67.

Find a trans for you car to just drop in and go or rebuild your current one.

[nos4blood70]

The 4T80 also needs some computer work to operate properly.

[rynmcdonald]

My trans code is FR2. What are the drive and driven sprockets tooth count? I might be getting a code thrown because of this be cause one of the codes reads illegal range. I don't know what the heck that means.