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post #16 of 27 (permalink) Old 10-28-2009, 08:44 AM
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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.

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post #17 of 27 (permalink) Old 10-28-2009, 09:46 AM Thread Starter
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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)?
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post #18 of 27 (permalink) Old 10-28-2009, 11:37 AM
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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.

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post #19 of 27 (permalink) Old 10-28-2009, 11:51 AM
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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

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post #20 of 27 (permalink) Old 11-21-2009, 05:41 AM
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Has the 2.4 an LSD? If not, is the 2.4 final ratio swapable to the RL LSD?

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post #21 of 27 (permalink) Old 11-21-2009, 11:01 PM
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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.

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post #22 of 27 (permalink) Old 11-22-2009, 10:45 AM
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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.

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Can we tune to compensate for tire size changes?

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post #23 of 27 (permalink) Old 10-16-2012, 08:19 PM
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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!
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post #24 of 27 (permalink) Old 10-18-2012, 12:11 PM
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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!
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post #25 of 27 (permalink) Old 11-11-2012, 09:23 PM
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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.

Last edited by Sythem; 11-11-2012 at 09:26 PM.
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post #26 of 27 (permalink) Old 03-08-2014, 02:36 PM
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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.
Bump, any luck?

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post #27 of 27 (permalink) Old 10-03-2014, 09:24 AM
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Has anyone had any luck changing the ring and pinion from the Sky base (3.91)???
I have also heard that a 4.1 from a chevy colorado might also fit! How can I know that for sure before I order it?

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