Trans swap

[Sleepinghail]

Will any 4l60e from older truck work in an 07 h3

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[CaseyS]

No.

There are many hummer specific parts including pan, 1-2 accumulator, filter, bell housing, plus it runs the small 245mm torque converter.

 

[Sleepinghail]

Bell housing and pan should be interchangeable. Was thinking a early 2000s 4l60e are all the same with exception of pans and bell housing

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[CaseyS]

Input shaft will likely be different. Anything behind an LT V8 or 4.3 V6 is going to have the 30 spline input shaft. H3 uses the late style 27 spline input shaft that goes with the 245mm torque converter.

There are also several parts under the pan that are specific to get the pan to clear the driveshaft. Off the top of my head that includes the 1-2 accumulator, the accumulator base plate, and if I recall correctly, the valve body is clearanced as well.

But you are correct, you can swap the bellhousing and pan, but not without the above matching as well.

 

[rsc]

Yes, the valve body is different too. The question also comes up whether the transmission will play with your truck electronically. There is a rumor that an 06 won't work in the later H3's due to an extra sensor in the internal wiring, and that earlier Coly/Canyon I5 transmissions won't work either (04-05). So the doom and gloom is to get a 4L60E from an H3, 4x4 Coly/Canyon that is the same year model as yours. I think that any 4L60E that was behind an I5 will work, regardless of year (but I do not have 100% proof yet).

 

[CaseyS]

That's the input speed sensor (iss). To support this sensor, the input shaft has teeth for the sensor to pick up plus the pump case is different for the sensor location. There were also some transition pump cases during 06 and 07 that had the bosses but not tapped and others tapped but with a dummy plunge installed.

I am not certain but I think 06 were all non iss and 08 all had iss. 07 not sure.

If you drop your pan and know what you are looking for you can tell if your current trans has the iss.

 

[rsc]

I found this interesting pre-labeled picture. Might help somebody ID things in the future.

 

[GreatDaneHummer]

When I called this place they said they could build a higher performance Hummer H3 trans... Is this possible with maybe a better over drive gear to help with the bigger tires?

http://www.transmissioncenter.net/4l60e.htm

 

[CaseyS]

PATC's website gives me a headache. They are local for me and weren't much of a help for my conversion, even in person so they don't get any of my business.

The gear ratios are what they are. To change gearing you have to change your differentials. Ahh, oops so 4.56 is as high as you can go on the front diff, guess we are stuck with ****ty gearing on an underpowered engine.

For shorter gearing you will have to go solid front axle to give you 4.88 and 5.13 gear options.

 

[GreatDaneHummer]

If I wasn't living downtown Chicago with a 6'6" max height in my garage I would by all means already have mine down to Thorparts getting it changed to solid axle with 5.13 gears. The only other way is going up in power = engine swap aka Cummins 4BT turbo! haha.

 

[humvee]

You'll run into things here and there that'll add up if you're adapting a regular 4L60e to your 3. Casey knows his trannys.
If you have the luxury of waiting, hold on until you find a an LH8 with a 4L60e. I've seen people spend less on that than I did adapting my tranny to a V8.

 

[4speedfunk]

True. Casey knows so much about H3 automatics...that I am terrified to touch one! After seeing numerous AT swaps on here, I would convert to a stick long before attempting an AT swap. I just don't see the satisfaction level ever exceeding the frustration level.

 

[GreatDaneHummer]

Any way to get a 6 speed manual to work with a 3.7l?

 

[rsc]

You won't find any regearing for the 4L60e unless you want a different 2nd gear ratio. The Camaro/Corvette guys had enough demand to have one made. I personally think that there is enough demand for a lower OD ratio, but the way the 4L60 mixes a ratio from one gear and another to come up with the 4th gear ratio, you will end up changing all your other gear ratios around too.

Just throwing this out there...
Find an Aisin AR5 5 speed, bolt it up, bolt in the clutch pedal and master cylinder on the firewall, change the PCM over, put in a new center console and shifter...probably get it all done for the price of a rebuild for your 4L60e.

 

[rsc]

Any way to get a 6 speed manual to work with a 3.7l?

Which one were you thinking about? I'm not aware of any that would physically fit AND leave the shifter in the right place.

 

[GreatDaneHummer]

With this turning more into a project toy I am thinking of finally putting that new 4BT Turbo Diesel in with an allison 6 speed manual. "some assembly required" lol

 

[CaseyS]

The problem in trying to fit any manual in there is that the i5 is not a standard Chevy bell housing pattern. The only manual ever behind an atlas is the aisin. Good luck trying to find or fab a bell housing to get it to adapt up.

We have all the bastard parts coming and going. Engine, trans pans, front diff, etc.

 

[GreatDaneHummer]

Part of this is everyone is starting to have an aging power train that no one wants to replace as is. If you are going to have to spend $10k or so then by all means upgrade to something better fitting for the H3's weight and off road requirements. Most likely why you did the Cummins.