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#1068325 - 10/19/20 10:11 PM Re: Hydramatic 8L90E [Re: lambeau40]  
Joined: Mar 2020
Posts: 46
CM1SCW Offline
Member
CM1SCW  Offline
Member

Joined: Mar 2020
Posts: 46
Lenoir City, TN
8l90 is a lot bigger than a 6l80 or 90 and the 6l's need tunnel mods for fitment. I getting ready to put ls3/6l80 erod package into my 87 monte carlo SS aero soon. I don' t have the equipment to do it myself so I am waiting for a slot In a shop in halls,TN to do it.

#1068359 - 10/24/20 01:24 PM Re: Hydramatic 8L90E [Re: MAP]  
Joined: Nov 2008
Posts: 646
jmireles Offline
10+ Year
jmireles  Offline
10+ Year
Member

Joined: Nov 2008
Posts: 646
El Paso, Tx
Lambeau,

From what I remember, the 4L80 fits in our Montes without any modifications to the trans tunnel. I would imagine the 6L80 and above would definitely require custom engineering. I LS swapped my Monte about 6 years ago and felt I was somewhat late to the dance...now we're talking modern LT swaps!


-'87 Monte SS LS 2/4L65e Quick Perf. 9" w/disk brakes
-'89 Iroc Z28 Stock 5.7 Edelb. TES headers, Borla Exhaust90K
-'77 Trans Am 468(Stroked) Doug's Headers Flowmaster catback
B & M shift Kit 400 Turbo trans. Edel brock Performer
RPM Intake Sean Murphy built Rochester Carb. Restored
in '08. 3K
#1068360 - 10/24/20 09:35 PM Re: Hydramatic 8L90E [Re: MAP]  
Joined: May 2002
Posts: 4,319
MAP Online content
15+ Year
MAP  Online Content
15+ Year
Member

Joined: May 2002
Posts: 4,319
Yuma, AZ
Hi Folks,

Latest from Chevrolet: https://www.chevrolet.com/performance-parts/transmissions/8l90-e-lt1

Weight shows as "210+" pounds. I take "+" to mean the weight of the converter and fluids. It might be in the vicinity of 35-ish pounds (just a guess on my part.)

But the specs are very impressive, especially coming from GM, which is very conservative (and rightly so) for their transmission claims. But also as expected, you can't just connect it to any motor: it only fits the GEN V LT1, LT4 or LT5 engines. As we rightly judged, the intricacies of matching the transmission operating parameters to the motor are too complex to easily permit adaptation to just any engine. No doubt some adventurous types will try to crack this and re-program it, but they had better be as smart as GM or they will likely compromise the life of the transmission. Torque management is very likely part of the secret sauce, and you've got to be able to control throttle and/or ignition timing to make that happen...

The appearance of the sheer size of this thing definitely suggests that the transmission tunnel in the MCSS body needs to get a lot bigger in width and height for this to fit.

Me, I'd save most or all of the 245-ish pounds of weight and go with an electric drivetrain.

Best,
MAP

Last edited by MAP; 10/24/20 09:42 PM.
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