4WD to 2WD 4l65e from Hummer
 

Hi All.

Thinking about doings this work myself - I know its a teardown (but not a rebuild). Coming out of a H2 vehicle with only 60k miles.

Process seems somewhat simple .... high level


<REMOVE IN ORDER>

PUMP WASHER AND PUMP
GASKET
2ND GEAR BAND and BAND ANCHOR
REVERSE DRUM
INPUT DRUM
TOP PLANET
SUN GEAR
SNAP RING
OUTPUT SHAFT

Put in 2WD shaft and reassemble.


Any good links on process - figure someone has done this before.

1) Any tips/hints
2) Any special tools ?
3) Any other considerations ?

thanks !!

Re: 4WD to 2WD 4l65e from Hummer
 

I would put an offer to trade up on craigslist locally before I'd tear down a working transmission, but that's just me.

Re: 4WD to 2WD 4l65e from Hummer
 

You can do this without pulling the Valve body off the case, you mentioned band anchor above which is under the VB...
To make it a bit easier to get the 2/4 band out and back in...remove the 2/4 servo from the side of the case.

Dont forget to pull out the TCC solenoid before pulling the pump out, if it has the Input speed sensor on the stator make sure you disconnect the connector too.

What year is this 4L65E ?

Good Luck !

Re: 4WD to 2WD 4l65e from Hummer
 

^^This^^

You basically have a trans from a Tahoe. They are cheap. Sell it and buy a 2wd version or swap someone. There is nothing special about that trans being out of a wannabe "Hummer" (H2 = Tahoe).

Re: 4WD to 2WD 4l65e from Hummer
 

I would change out the output shaft because I got the trans for free and I own my own trans shop, but that's just me.....

" BUILD NOT BOUGHT "

Re: 4WD to 2WD 4l65e from Hummer
 

Pretty sure at a minimum I'll replace the shaft and tail housing.
I probably will just do a revuild anyways if it's OEam inside to just fix some week points like the sun shell and the 3/4 clutches and maybe a new VB.

Figure I'm this far into this build .... Whats anither few weeks.

Any recommendations youngpup ?

Re: 4WD to 2WD 4l65e from Hummer
 

If you are planning to pull the VB off the case, than I would recommend installing a good shift kit, these 4l60/65/70's need it...

Re: 4WD to 2WD 4l65e from Hummer
 

Sure ... increase the line pressure

Just a transgo shift kit enough ?

Was also goign to do the 3/4 and the sunshell ...... anything else ?

Sounds about right for a slighlty better than stock build.

Re: 4WD to 2WD 4l65e from Hummer
 

Since you have it apart, I would put a wider sun gear bushing made by SONNAX

Upgrade your forward sprag and install Kolene steels along with upgraded clutches, you can buy different 3/4 clutch packs if you like....you can increase the number of clutches if you like as well...

The transgo shift kit will change this 4L65E in a great way, it upgrades the 2/4 servo but you can buy different 2/4 servo's if you like as well....

Upgrade your 2/4 band

Sand the reverse input drum 2/4 band surface, (same thing like replacing a clutch in a manual car, always resurface the flywheel)......

there are many more upgrades I will add more as time goes on....

I can add pics if you like....

thanks for listening, and Good Luck !!

Re: 4WD to 2WD 4l65e from Hummer
 

Check out the pic, it shows the difference in a 5 pinion front and rear planetary gears to the 4 pinion....your 4L65E may or may not have the 5 pinion planetary gears, its a nice upgrade if you plan on "USING" the transmission....

Re: 4WD to 2WD 4l65e from Hummer
 

But then you wouldn't be on here asking how to do it. as the OP is. As you own your own trans shop, I doubt that you would only be changing the output on a "free" transmission...lol.

Re: 4WD to 2WD 4l65e from Hummer
 

Sorry - not sure why I don't always get the updates.

I pickup the engine/trans on Wednesday.
I *think* I am at least going to bench tear it down and organize each section into their own seperate plastic buckets.

I will inspect the hardparts as well as the fluid. If everything looks ok I will probably

1) Increase the 3/4 clutch count and maybe new clutches depending as it just requires a screwdriver I believe:)

2) Validate the 5 pinion sun gear - I believe the 4l65e already has it though

3) Add a Sonnax Servo and do a transgo VB upgrade and new 2/3 band

4) replace shaft and tailhousing and get a new VSS


Since the truck will only be stock lq4 (Around 275 RWHP) think this will be enough for now.

Later ....... if I add a cam I'll tear into it again if needed and/or do a 4l80e swap.

Something like that - but still researching and subject to change :) Seems like a good way to tear into trans and get what I need without much cost. Learn for the next one - which is about 50/50% chance of being 2 weeks after I start driving it if I miss something :)

I'll start a thread both here and at LS1TECH if I pull the pin. Figure only one way to learn.

Maybe think on the positive side of life, if you had a good friend like me you would get free work on your vehicle. Sure I would let you use one of my 6 lifts to pull your trans on your Jeep....for sure...must be hot outside....

Again, "BUILD NOT BOUGHT"

QQ.........................



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Re: 4WD to 2WD 4l65e from Hummer
 

Sounds like you are on the right track, great to see people take on projects like this, dig in and make it work... Good Luck to you in this effort !!!

Re: 4WD to 2WD 4l65e from Hummer
 

X2..:fry:

Re: 4WD to 2WD 4l65e from Hummer
 

Thanks for your tips

Re: 4WD to 2WD 4l65e from Hummer
 

https://www.ebay.com/itm/GM-4L65E-TR...gAAOSw28pa6nKo

This kit ok ?

Re: 4WD to 2WD 4l65e from Hummer
 

Seems to be a bit on the high side, look out for the filter not fitting...if you have the deep pan looks like the filter in the kit will not work....plus this kit does not come with steels, for that price I would want the steels to come with it.... Just my opinions...thanks !!!

Re: 4WD to 2WD 4l65e from Hummer
 

Thx

Suggestiin/alternative ?

Also ... Stock or just a cam.

Use a stock 4l65e sun shell or a best or a sonnax.

Corvette servo or stock.

Thx. Will start a full teardown and shaft swap thread this weekend hopefullly been building a deck with the wife. Will link you in.

Re: 4WD to 2WD 4l65e from Hummer
 

Check this link out : http://www.makcotransmissionparts.co...L65EMkits.html

Makco Trans Parts,
They have what you need at the site above, look around on this site, they will have exactly what you need from stock to high performance.

I like sonnax stuff, its hard to beat. But again, my opinion.
As far as the 2/4 servo, I always change the servo to either a corvette style or even super servo depending on the application...if you go stock cam, use the corvette servo.

again, thanks for listening....

Re: 4WD to 2WD 4l65e from Hummer
 

Also
I have the deep pan.
Seems to be the right filter based on
https://www.gmtransmissionparts.com/...n-Style-Guide/

Cheapest with steels I can find

https://www.ebay.com/itm/Chevy-Chevr...IAAOSwlcZZg5YH

Re: 4WD to 2WD 4l65e from Hummer
 

thanks youngpup