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Old 02-21-2012, 08:27 PM   #1
68GMCCustom
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Exclamation calling all LSx swap with 6L80 or 90-e

I am looking at electronic transmission now that it looks like I'll be running efi soon. I had originally thought 4L80e but the more I thought about it...if I was tossing on some technology I might as well take full advantage of it...as in a 6 speed transmission. While I'd like to put a t-56 in there an automatic is more practical. After all....my truck already has a successor. My grandson!

SO.....how's the fit on these two transmissions with our trucks tunnel setup. Is a tall (turbo 400?) trans cover needed over the short one ????...or just a little selective cutting and pounding?

Thanks!
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'68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy
'72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close
'06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD
'18 Kia Sorento - wife's econo-driver
'95 Chevy S10 - reg cab shortbed, LS, 4.3, auto...

my '68's powertrain and chassis build -links broken
A surprise phase - carb to efi -links broken
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Old 02-22-2012, 12:46 AM   #2
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Re: calling all LSx swap with 6L80 or 90-e

Youtube mast motorsports 68 c10 if you havent already. It doesnt tell you much about fitment but it does give you a little you could use...
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Old 02-22-2012, 07:18 AM   #3
HavinSomeFun
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Re: calling all LSx swap with 6L80 or 90-e

I just went from a 5.3/4l60 to a 6.0/4l80 setup in my 67. It fit well. However, I had to trim a portion of the tranny to use my Thorley swap headers, move the tranny crossmember and change my exhaust. Currently everything is bolted in and I should fire it up this weekend!
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Old 02-22-2012, 08:54 AM   #4
usmcchevy
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Re: calling all LSx swap with 6L80 or 90-e

http://67-72chevytrucks.com/vboard/s...=269754&page=8

http://67-72chevytrucks.com/vboard/s...d.php?t=387209

http://67-72chevytrucks.com/vboard/s...d.php?t=368325

I'm going to guess you will want the high hump so you can get to motor as far back as possible.
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Old 02-22-2012, 07:19 PM   #5
68GMCCustom
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Re: calling all LSx swap with 6L80 or 90-e

Thanks all. Trying to get this done (6L80 or 90e purchase) before my E38 & custom harness/ecm ship. Finding late models for $1k or so depending on miles
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Kurt -

'68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy
'72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close
'06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD
'18 Kia Sorento - wife's econo-driver
'95 Chevy S10 - reg cab shortbed, LS, 4.3, auto...

my '68's powertrain and chassis build -links broken
A surprise phase - carb to efi -links broken
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Old 02-22-2012, 08:44 PM   #6
HavinSomeFun
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Re: calling all LSx swap with 6L80 or 90-e

What type of FI are you going to use?
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Old 02-22-2012, 10:22 PM   #7
68GMCCustom
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Re: calling all LSx swap with 6L80 or 90-e

EFI? I was talking efi and it will be the stock L92/LY6 truck setup to start with. I made a deal so its one of those "you get what you get" scenarios. I have a thought in the back of my head tho.... to slowly swap that setup into a custom setup using port injection and a 1000fcm 4bbl throttle body.

FI? I've spoken about adding one (TVS1900 or TVS2300) to the TBSS sometime after the wife retires it and I get it late this summer.
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Kurt -

'68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy
'72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close
'06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD
'18 Kia Sorento - wife's econo-driver
'95 Chevy S10 - reg cab shortbed, LS, 4.3, auto...

my '68's powertrain and chassis build -links broken
A surprise phase - carb to efi -links broken
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Old 02-22-2012, 10:52 PM   #8
HavinSomeFun
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Re: calling all LSx swap with 6L80 or 90-e

I meant EFI.. my fat finger typing didn't help. I'm also using the truck stuff on my Lq4. However, I have an LS6 setup I have considered using to get the most out of the cam and stall I'm running. I've heard nothing but good stuff about the LY6 setups with a good cam.
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Old 02-22-2012, 10:56 PM   #9
68GMCCustom
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Re: calling all LSx swap with 6L80 or 90-e

Has been strong combo as a carb'd setup. I have also considered running a car intake. If you're gonna twist it up to 7k or so, then I think its worth it.
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Kurt -

'68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy
'72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close
'06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD
'18 Kia Sorento - wife's econo-driver
'95 Chevy S10 - reg cab shortbed, LS, 4.3, auto...

my '68's powertrain and chassis build -links broken
A surprise phase - carb to efi -links broken
68GMCCustom is offline   Reply With Quote
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