I just read in the new issue of motor trend trucks that the new silverado SS will have a 4L85 in it.....I know its only a magazine, and they do have a "NEVER HAPPEN" truck from GM in there....so I do know that they have trucks that wont ever make it to a dealership in there.....
Anyone know anything about GM coming around and giving the LQ9 guys the trans upgrade they needed? I hope they do that because now more parts should be available for the swap....what do you guys think? 4L80's might become more common in our trucks now that they make a production harness and crossmember.....and drive shaft.....

I've seen that in more than one mag, does anybody know the code to the 4l85e and I will go outside and check mine. I think mine is a 4l60e

The great thing about GM is that they stamp 4L60 on everything. My 4L65 has 4L60 stamped right on the bell housing. What is the code on the glove box sticker for a 60? 65? 80? Just want to look and see what it says on mine.

On GM online order reference guide it has the RPO M32 which says it's the 4L60E HD transmission for the 2005 and 2006 SS.

I just looked in my glovebox and I have the rpo code M32, now I am confused as to whether it is the 4L60E or 4L65E

I don't have my truck with me or I would go check, it's at the TRANNY SHOP :jest:

I just looked in my glovebox and I have the rpo code M32, now I am confused as to whether it is the 4L60E or 4L65E

You would have the 4L65E. Nice lookin truck BTW!

You would have the 4L65E. Nice lookin truck BTW!
Thanks! :chug:

For whatever it's worth. This is from GM's sight:
Transmission model AUTOMATIC 4-SPEED w/OVERDRIVE 4L60-E
RPO Code M30

Transmission model AUTOMATIC 4-SPEED w/OVERDRIVE 4L60E HD
RPO Code M32

Nice truck out2win

For whatever it's worth. This is from GM's sight:
Transmission model AUTOMATIC 4-SPEED w/OVERDRIVE 4L60-E
RPO Code M30

Transmission model AUTOMATIC 4-SPEED w/OVERDRIVE 4L60E HD
RPO Code M32

Nice truck out2win
I wonder if GM's sight made a typo? And truck trend says 4L85E :bang:

Thanks JDG

I wonder if GM's sight made a typo? And truck trend says 4L85E :bang:

Thanks JDG

I don't think they did as this is coming straight from their online order guide. I noticed not to long ago they started referring to the M32 as an HD. Also the transmission on the new Trailblazer SS is an M70 (4L70E). This same transmission is going to be on the "VortecMax Performance Package" offered for the 2006 Silverado extended cab 4X4 and the new short bed crew cab 4X4.

VortecMax Performance Pack, includes (LQ9) Engine, Vortec high-output 6000 V8 and door badge that reads "Vortec Max", (M70) Transmission, 4-speed automatic, super duty, (GT5) Rear axle, 4.10 ratio, (G80) Differential, locking, heavy-duty, rear, (ZX3) Suspension Package, Ride-Control, (NP8) Transfer case, electronic Autotrac, (KC4) Cooling, external engine oil cooler, (KNP) Cooling, external transmission oil cooler, auxiliary, and (Z82) Trailering equipment, heavy-duty
1 - Requires CK15753 or CK15543 Models. (QJM) or (QJP) Tires must be ordered. (P25) Wheels must be ordered. Option content within this package may not be substituted or deleted. - Not available with (Z71) Suspension Package, Off-Road.

M30 = 4L60-E
M32 = 4L65-E
M33 = 4L60-E for hybrid (electric oil pump, etc.)
M70 = 4L70-E
MT1 = 4L80-E
MN8 = 4L85-E
M74 = Allison 1000

Ok, I just read the article in Truck Trend Magazine about the 2005 RWD SS. It does indeed say 4L85E and lists its correct gear ratios. Can anyone confirm if this is correct or a mistake??? :bang:

Its nice to know that I'm not crazy.....ha ha....someone else saw it too...

Its nice to know that I'm not crazy.....ha ha....someone else saw it too...

Just because you were right doesn't mean you're not crazy.... :burn: :cheers:

-Chuck
'03 DSG Lightning *sold*
'05 GMC Sierra WT 4.8L

I am skeptical of several bits of data in that article. I think the trans should have been a 4L65-E instead of a 4L85-E. If the person putting the data together thought it was an '85, then it makes sense that they would find and list the ratios for that trans.

The tire size is listed as 245/75R20 which would have a diameter of 35.4 inches, which is a significant increase over the 31.9 inch diameter 275/55R20 tires that were previously used. Again I think this is a typo.

The axle ratio is listed as 4.10, but an article on the internet said Chevy changed the ratio to 3.73 in the 2WD SS.

So, someone has a 2WD SS and can verify this stuff. How 'bout it?

Mike

I am skeptical of several bits of data in that article. I think the trans should have been a 4L65-E instead of a 4L85-E. If the person putting the data together thought it was an '85, then it makes sense that they would find and list the ratios for that trans.

The tire size is listed as 245/75R20 which would have a diameter of 35.4 inches, which is a significant increase over the 31.9 inch diameter 275/55R20 tires that were previously used. Again I think this is a typo.

The axle ratio is listed as 4.10, but an article on the internet said Chevy changed the ratio to 3.73 in the 2WD SS.

So, someone has a 2WD SS and can verify this stuff. How 'bout it?

Mike
The 2wd SS does come with 3.73 gears.
It's hardly any different than the VHO trucks other than the body kit.

Jim

What's a 4L70E? Is it like a stronger 60/65E, or a weaker 80/85E ? This is getting confusing...

It should have had a 80 in it.

What's a 4L70E? Is it like a stronger 60/65E, or a weaker 80/85E ? This is getting confusing...
im confused as well :eek2:

M30 = 4L60-E
M32 = 4L65-E
M33 = 4L60-E for hybrid (electric oil pump, etc.)
M70 = 4L70-E
MT1 = 4L80-E
MN8 = 4L85-E
M74 = Allison 1000


:stupid:

James B is correct.

i just noticed the other question. a 65E is a heavy duty version of the 60E. the 70E is an even heavier duty version of the 65E and is new for 06'. i'm glad the SS only gets the 65E. i'd rather use it for this application than a poorly geared power sucking 80E anyday. until you get past 600+hp, the 80E isn't necessary when it comes to racing.

I agree zippy. The 700R4, 4L60-E, 4L65-E, and 4L70-E are all very similar designs that are much more efficient at transferring power than the 80 and 85. The larger transmissions, modeled after the TH400 have larger pumps, and thus take more of the engine's torque to turn the pump instead of the wheels.

The smaller trannies are more efficient, so if you can make one work for your power application, it will put more ponies to the ground, and weigh less.

Mike

So can a 60E be made into a 70E, and if so, what's involved? Thanks!

Chevy high perf. also lists the new SS having a 85e...... :confused:

that's correct. the company that provides the information booklets for the magazine testers all had the SS listed as a 4L85E. what is sad about that is the magazine's such as chevy high performance should have known this was incorrect by simply looking under the truck. in my opinion that was an embarassment to the magazine. true chevy guys can tell you the difference between a 65E and an 85E. they also listed the truck they tested as an 06' and it was an 05'.

I don't have my truck with me or I would go check, it's at the TRANNY SHOP :jest:

No need to check... if it is in the tranny shop it is a 60E

i heard through the grapevine that the 70E is going to be coming up.

coming up? the 70E is standard in all 06' trucks with the LQ9 and LS2's with auto's.

coming up? the 70E is standard in all 06' trucks with the LQ9 and LS2's with auto's.

thats what i meant. thanks mike.

oh, ok. lost me for a minute there.

oh, ok. lost me for a minute there.


Thats not very hard

at random i just stare into space...

or at a girls ass....

coming up? the 70E is standard in all 06' trucks with the LQ9 and LS2's with auto's.
My new ordered SSS has the m32 code for the trans. This is the 65 right?

So the 4l70E is going to be stronger then the 4l60E I have right now correct? I wondering what is involved in swapping the 4l70E in place of my 4l60E?

My new ordered SSS has the m32 code for the trans. This is the 65 right?


yes, the M32 is the 65E. is that what your 06' came with upon delivery?


as for the swap of a 60E to a 70E, it should be a direct bolt up swap.

Do you guys think the swap to the 70 would be worth it? I just hate the way my 60 drop on its face between shift and I'm affraid my 35" tires will put to much pressure on it?

Do you guys think the swap to the 70 would be worth it? I just hate the way my 60 drop on its face between shift and I'm affraid my 35" tires will put to much pressure on it?


Anyone know the gear ratios for the 4L70E? Are they the same as the 60 but with a higher torque capacity?

yes, same gear ratio's.

Do you guys think the swap to the 70 would be worth it? I just hate the way my 60 drop on its face between shift and I'm affraid my 35" tires will put to much pressure on it?
The 70e will also make acceleration fall on ist face at the shifts, this is due to the huge rpm drop caused by the large ratio differences in teh 60/65/70e transmissions. These trnas have a 3.06 1st gear ratio and 1.62 2nd(Ithink)and 1:1 3rd and 0.7:1 OD.

The 4l80e has a 2.48 1st, 1.48 2nd and 1:1 3rd and 0.75:OD. It has a much better ratios for acceleration, but because of the taller 1st gear(when compared to the 60 series trans) 1st gear acceleration will be lessened somewhat.

The 80e is less effecient than the 60 series trans and some more hp is lost thru it due to beefier internals like bearings and bushings, but f body owners who switch to th 350's(same 1-3 gear ratios as the 400/4l80e0 often drop 3-4 tenths in the 1/4 mile because of the lessened rpm drop at the shift). The 80e is 100lbs heavier than the 60/65/70e trans.

i would think that the better ratios, would almost even out the 80e's greater ineffeciency and heavier weight.

The 200r4 has the best of both worlds, a 2.74 1st gear with closer ratios than the 60e but is lighter and more effecient than the 80e. These are the auto transmissions used in the turbo buicks and can be built very strong.

The 80e is a good choice esp when a power adder is being used, everyone can afford to give up a few hp to the rear wheels in a tradeoff for much better durability and strength at higher power levels, then add teh better ratios on top.

Hitting a 2.48 1st gear with a stall converter with 4.10 gears will be much easier to make hook up than a 3.06 with a stall converter with 4.10 gears.

I am only at around 260-280 rwhp and I want an 8e behind my engine. I have had very bad luck with teh 60 e trans.

Hog