This came up in the mall. Just thought I would repost info for 6-speed swappers. The differences are suttle, and the newer MU9, aside from still costing almost $2000, has differnent gear ratios also. It may have a different bell housing bolt pattern IIRC.
06 F40 MT2 Gear Ratios (like this: 1st, 2nd,...6th IE 3.77 = 3.77:1) Both have a 3.55 Final Drive 3.77, 2.04, 1.32, 0.95, 0.76, 0.62 07-08 F40 MU9: 3.77, 2.04, 1.37, 1.05, 0.85, 0.71
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01:32 PM
PFF
System Bot
jscott1 Member
Posts: 21676 From: Houston, TX , USA Registered: Dec 2001
This came up in the mall. Just thought I would repost info for 6-speed swappers.
It also has these disturbing looking holes in the case...
On paper I believe the general consensus is that the 2007 is slightly better with less spacing between gears and not as much overdrive. But the change is not dramatic. In the real world I find the 2006 model to be quite adequate. I wouldn't spend an extra $1,600 for a slightly better gear ratio.
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01:42 PM
ClayTonto Member
Posts: 524 From: White, GA, USA Registered: Dec 2008
The only 6 speed that has the "standard" V6 bellhousing is the trans from the G6. Newer transmissions have a bellhousing for the newer DOHC V6 or the Ecotec, both of which are very different from the pushrod bellhousing. You'd need a custom adapter plate to run one of the newer boxes.
MT2 sixth with 2nd-5th from an MU9 and the 3.91 final from an 03-04 box might make a nice transmission. Gotta have a custom 1st, though.
[This message has been edited by Will (edited 05-05-2009).]
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02:20 PM
R Runner Member
Posts: 3700 From: Scottsville, KY Registered: Feb 2003
Correct me if I'm wrong, but this is the way I understand it:
The 6 speed for the G6--which is the ONLY version of the 6 speed that bolts up to 2.8, etc.--was a one year ONLY option and is ONLY available with MT2 gearing.
ALL other versions of the 6 speed have bellhousings for different engines.
Correct me if I'm wrong, but this is the way I understand it:
The 6 speed for the G6--which is the ONLY version of the 6 speed that bolts up to 2.8, etc.--was a one year ONLY option and is ONLY available with MT2 gearing.
ALL other versions of the 6 speed have bellhousings for different engines.
Yes and no according to GM.
The trannies posted above are of the G6 and Saab version of the F40, that's why the bellhousings are different. The F40 with the GM V6 bellhousing was only found in the G6 and it did receive the upgraded version for 07 according to GM so 06 and 07 G6 trannies are different in that regard.
The MU series applies to both the 5 spd and 6 spd trannies that originated in the Saab and can be found bolted to the supercharged and turbocharged Saturn Redline and Cobalt SS plus a couple or so later vehicles. The Saab bellhousing and possibly the crank flange configuration appears to be shared by the 3.6L DOHC.
excerpt from G6 tranny "what's new":
2007 F40 (MU9)
2007 Model Year Summary General Motors Powertrain-Europe F40 six-speed manual car transaxle
● New Detent System For Quicker And Easier Shifting ● Gear Ratio Changes For Quicker Acceleration
[This message has been edited by Joseph Upson (edited 05-05-2009).]
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08:29 PM
Will Member
Posts: 14274 From: Where you least expect me Registered: Jun 2000
Originally posted by Joseph Upson: The Saab bellhousing and possibly the crank flange configuration appears to be shared by the 3.6L DOHC.
Don't think so... the Ecotec and V6 patterns are different. Makes 4 bellhousings with which the 6 speed was used: Saab 2.3, pushrod V6, Ecotec, High Feature V6.
I thought the 6 speed in the G6 was only a one year option.
[This message has been edited by Will (edited 05-05-2009).]
Don't think so... the Ecotec and V6 patterns are different. Makes 4 bellhousings with which the 6 speed was used: Saab 2.3, pushrod V6, Ecotec, High Feature V6.
I thought the 6 speed in the G6 was only a one year option.
You are correct, Will. The 6-speed in the G6 was only available in '06 and was mated to the pushrod 3.9L in the GTP model. All other G6 trannies are auto with the V6.
Originally posted by Will: Don't think so... the Ecotec and V6 patterns are different. Makes 4 bellhousings with which the 6 speed was used: Saab 2.3, pushrod V6, Ecotec, High Feature V6.
I thought the 6 speed in the G6 was only a one year option.
I don't know Will, looking at the pictures on the GM website the top bolt holes between the Saab 2.8L 5 spd and the Ecotec 5 spd appear to be in the same location. Recall that the 3.6L is a global engine so there is apparently some diversity in the bolt patterns it can accept. The 6 spd automatic for GM cars comes in two different bellhousing forms one of which fits the traditional 2.8L bellhousing. The 6T70 is bolted to the 09 3500 VVT and the 6T75 the 3.6L but GM pictures show the old bellhousing style for both engines.
I received a quote some time ago on an 07 F40 from a G6.
I don't know Will, looking at the pictures on the GM website the top bolt holes between the Saab 2.8L 5 spd and the Ecotec 5 spd appear to be in the same location. Recall that the 3.6L is a global engine so there is apparently some diversity in the bolt patterns it can accept. The 6 spd automatic for GM cars comes in two different bellhousing forms one of which fits the traditional 2.8L bellhousing. The 6T70 is bolted to the 09 3500 VVT and the 6T75 the 3.6L but GM pictures show the old bellhousing style for both engines.
If they were going to use significantly different bellhousing patterns, then they'd need significantly different block castings, which defeats the very idea of having a GLOBAL engine.
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11:13 PM
May 6th, 2009
R Runner Member
Posts: 3700 From: Scottsville, KY Registered: Feb 2003
use the search function. I plan too once I get into the details.
