Final drive ratio changes?

[JRinKY]

MEGAS : GETRAG Corporate Group - 645

it does exist
Cadillac CTS, STS, SRX, CTSv, STSv und Pontiac Solstice

Curious. When I go to the "Product Search" page the 645 is not listed as an option, but the page is found by putting "645" in the Search window.

[Johnny-Longtorso]

So how does one go about buying one of these mythical beasts? Is this a dealer purchase? I suppose it's a bit ambitious to ask for GM part numbers (for a 3.91 loaded unit)?

[JRinKY]

Johnny-Longtorso : So how does one go about buying one of these mythical beasts? Is this a dealer purchase? I suppose it's a bit ambitious to ask for GM part numbers (for a 3.91 loaded unit)?

Pick the parts source of your choice; dealer, ebay, salvage yard, etc, and look for a replacement drive axle for one of the listed vehicles with the ratio that you want. The dealer would be the easiest as well as the most expensive.

[nighttripper]

Originally Posted by Johnny-Longtorso

So how does one go about buying one of these mythical beasts? Is this a dealer purchase? I suppose it's a bit ambitious to ask for GM part numbers (for a 3.91 loaded unit)?

I would think the number for the 2.4L rear end would give you the info as it has a 3:91

[Kuprito]

Has the 2.4 an LSD? If not, is the 2.4 final ratio swapable to the RL LSD?

[JRinKY]

Kuprito : Has the 2.4 an LSD? If not, is the 2.4 final ratio swapable to the RL LSD?

LSD was an option with the 2.4.

[NormSky]

Scott, thanks for the correction: 3.91 base Kappa.

Johnny, HPTuners or any of the tuning software can be used to adjust the speedometer/odometer for gear or tire changes.

Norm

Originally Posted by Johnny-Longtorso

Can we tune to compensate for tire size changes?

[Sythem]

Hi Everyone,

Does anyone know where a 2.73 Getrag 645 might be found? Done some searching but the 3.23 is the lowest ratio I can find.

Thanks!

[wspohn]

Originally Posted by Sythem

Hi Everyone,

Does anyone know where a 2.73 Getrag 645 might be found? Done some searching but the 3.23 is the lowest ratio I can find.

Thanks!

Heading off to Bonneville...?

[Sythem]

Originally Posted by wspohn

Heading off to Bonneville...?

I wish I understood this. Yeah, I know that's a hell of a low ratio, it was just an idea and I figured I could swap it, see how it worked, and if the accel tradeoff wasn't worth it just sell it again :P but it looks like I'm going with the 3.23.