Z03Z28

Now that GM is making these for there cars,I'd like to put one in my 91Z28.
I could run better gears and get better milage.For those of you who didn't know they use them in BMW's.There great and smooth.It's going to be a while before the start to show up used.

sully91rs

How big are the 5 and 6 speed auto trans? Think they would be a straighforward install, or will trans tunnel and such have to be modified? I do like the idea of a 6 speed auto, but how realistic is this idea.

mateo

I know the new vette is using a rear mounted trans 6spd...

The CTS uses a ZF 5spd unit that also is used by BMW...and GM acutally made them for quite a while for BMW....this unit is the most accessable Id imagine

Looking at ebay I see quite a few CTS transmissions

Z03Z28

we'd need something for a rear drive V8.I think it is very realistic

sully91rs

OK, who is going to be the first to be a 5 or 6 speed auto in a thirdgen?

Kevin91Z

iTrader: (1)

You also need some kind of computer to control the electronic transmission, and they arent cheap.

mateo

O.k. After further research there are exactly (2) transmissions in GMs arrsenal that would do the job Hp /Tq wise

Option 1 = Hydra-Matic 5L50-E = built up versoin of CTS/BMW trans...used in V8 STS and XLR ...odd design though


Option 2= Hydramatic 6L80- used in STSV XLRV and Vette(rearmounted) this seems to be the choice for Fbodys as it in turn replaces the 4L60/4L65E considering those are the trannys the vette used for years and now its the 6L80 and we def know itll hold its own in hp/tq based on its applications.



oh, one more thing, the 6L80 is 100% computer controlled with algorithms etc....in turn someone would just need to "hack" it just like the engine PCMS and those algorithms should be tunable to L98/LT1/LS1 powercurves........all assumptions and dreams/wishes on my part

sully91rs

Very nice work.
The price tag (computer controller and trans)?

Shagwell

...on the 6-speed auto -
- I've read several articles that say down shifts kinda suck. It drops back one at time, kinda hunting for the right gear. Once it's there the magazines claim it's good to go though....
Upshifts are supposedly firm enough without being harsh....

mateo

For those wanting more technical info on the 6L80 here yah go in PDF format...gives alotta lowdown on it.

http://media.gm.com/us/powertrain/en...80%20(MYC).pdf

This will def be my transmission of choice if someone figures this out in the future when I rebuild the LT1 and put the LE2 heads and cam in.

mateo

BUUUUUUUUUUUUUMP!!!!

This is such a good topic anyone have anymore say so?

sully91rs

I'm not sure if i like the one-at-a-time downshifting. i culd be crusing in 5th or 6th, and by the time i get it down to second or third, the car i would have been tryin to race would be gone .

3.8TransAM

This directly correlates with the need to have the tranny controller completely hacked.

The controller is inside the trans itself so wiring to it would be minimal. Stealing and converting the needed inputs to function from the ECM like TPS, vaccum, mph, etc.

Factory auto trans calibrations suck and are made for:

emissions
retarded drivers
every condition on the planet
lessen drivetrain abuse
torque management
keep it together under warranty
still able to move unless outright failure.

For people who have done electronic tranny tuning, they know exactly what I mean.

Change the actual shift points and line pressure, whack most of the torque management garbage, change the converter lockup tps, cut the shift times in half and go drive the car again.

Worlds apart and a hell of a lot more fun.

It appears the new GM trannies are gonna be the hot tickets for us, just how expensive will the tranny controller be. There will be like 2 cases and 14 versions, so there will be good ones out there to use.

Wonder if could be made to live blanking the engine stuff and running the Trans stuff in the newer PCM's

U can run 4L60E now if u want using a late model TBI PCM piggybacked with your 730 if u wanted to, its all out there.

later
Jeremy

mateo

nice info, it is good to see that once GM goes ahead on their RWD platforms well most likely being seeing this trans on the new cars. Impala,Monte,Camaro etc.....6L80;s should be a dime a dozen much like the 4L60.

snowstorm

Old thread, but wonder if anybody have more info.

My daily drive needs a stronger transmission, it’s a bmw 330 diesel (3litres, 6 cylinder, 285hp/450ft.lbf. The current transmission is the GM 5L40/50, only rated 311ft.lbf.

I’m looking into either making the 5 speed stronger or swap to a 6L45/50 or 6L80/90. So far I’ve no luck finding anyone who can do much of anything with the 5 speed. Therefore I’m looking in the direction of the 6 speed. From what I’ve found out the 6L45/50 are similar to the 6L80/90. The 6L45 are to be found in bmw’s, among numerous GM cars.

First chose would be to strengthen my existing 5 speed. But since nobody seems to offer any upgrades, this possibility seems to be difficult.

Second chose would be to get a 6L45/50. This transmission is already to be found in bmw’s, so it’s more likely to be an easier swap. Since the standard 6L45 only holds 332ft.lbf it would need some seriously upgrades.

Last chose is the 6L80/90. This one can be found in camaro, vette, cadillac’s, varies van/trucks. In the vette its rear mounted.

My questions are?
Do you guys now if there are any upgrades for the 5L45/50?
Any upgrades for the 6L45/50?
Has the 6L45/50 an integrated TCM like the 6L80/90?
What about the physical size, how different are the 6L45/50 and 6L80/90 compared to the 5L45/50?

Cheers
ojo

TEDSgrad

iTrader: (4)

I'm watching these, too.
Here's an article on upgrades: http://www.gmhightechperformance.com...des/index.html

Waiting to see one in a 3rd gen.

Brian

snowstorm

Hi all.

I love my 5L40E, except the torque holding capacity It change gears super smooth, the ratio (3.42, 2.21, 1.60, 1.00, 0.75 and rewerse 3.03) works well for my car/drive style. But I need a stronger trans. I don’t dare to do wot through gear shift, or to do kick down.

Sonnax don’t offer any performance upgrade for my trans.

IPT (they focus on import cars, but guess there product could be used on ours thirdgen’s) offer performance upgrades. They modify hydraulic and mechanic components in the trans. I’ve read threads where people are told IPT’s upgrades increase torque holding capacity by 40%. If that’s true it’s good enough for me. Sadly they don’t answers my eposts, have sent them two.

Anyone who know about other companies who offers performance upgrades for 5L40E?

Can anyone clarify the difference between 5L40 and 5L50E?

Cheers
ojo