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03-10-2018, 10:52 PM
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#1 |
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Registered User
Join Date: Mar 2018
Location: Barrington nh
Posts: 114
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4L80E Trans Tunnel mods?
Is there a need to modify the trans tunnel for a LSx/4L80E swap in a '74 C10?
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03-10-2018, 10:57 PM
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#2 |
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Registered User
Join Date: Dec 2014
Location: Euless, Texas
Posts: 520
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Re: 4L80E Trans Tunnel mods?
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1974 Cheyenne 10 LWB Stock 350 W/HEI /TH350/AC/4 BBL Quadrajet Mopar by Birth Chevy by Choice |
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03-10-2018, 11:55 PM
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#3 |
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Registered User
Join Date: May 2012
Location: horseheads,ny rust belt
Posts: 2,794
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Re: 4L80E Trans Tunnel mods?
there maybe a tad bigger than a th400 . the 4l80-e shares some of the th400 parts .
you should be fine or maybe just a few tweeks. on a 1974 i would also be looking at body mount bushings . if there dead this will drop the cab closer and make it tight.
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77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
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03-11-2018, 12:25 AM
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#4 |
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Senior Member
 
Join Date: Jun 2009
Location: Phoenix AZ
Posts: 4,602
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Re: 4L80E Trans Tunnel mods?
My truck doesn't have an LS but I did install a 4l80e and didn't have to do any modifications
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AZPartsLocators on Instagram 1972 Cheyenne Super Short Bed big block "Blackie" 1977 Crew Cab GMC Short bed with 4BT Intercooled Cummins Diesel and a 4L80e "The Junkyard Dog" 1985 Crew Cab Chevy dually with 5.9 Cummins "The Big Dog" This is what my dad liked to be called by the grandkids before he passed so it seems fitting for his old truck. |
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03-11-2018, 08:46 AM
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#5 | |
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Registered User
Join Date: Mar 2018
Location: Barrington nh
Posts: 114
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Quote:
Just bought the ‘74 but have been building the LS and tranny for a while now. It’s my first LS build and m following the Sloppy Mechanic way,should be right around 500hp to the wheels with a small turbo. https://photos.app.goo.gl/UgTNp418KNMj2q2i1 Posted via Mobile Device |
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03-11-2018, 08:57 AM
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#6 | |
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Registered User
Join Date: Mar 2018
Location: Barrington nh
Posts: 114
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Re: 4L80E Trans Tunnel mods?
Quote:
That’s great news! Pretty sure I can set the engine where I want so it does not sound like I’ll need to cut the tunnel! Hope to have the swap done by mid summer (working on my other car and doing some early season racing first) so the less work the better. Sweek, I’ll look into the cab mounts, thanks for the heads up |
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03-12-2018, 10:43 AM
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#7 |
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Registered User
Join Date: Mar 2016
Location: Cbus, Ohio
Posts: 290
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Re: 4L80E Trans Tunnel mods?
my 4l80e fit my 87 2wd cab with no issues.
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03-12-2018, 10:06 PM
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#8 |
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Registered User
Join Date: Mar 2018
Location: Barrington nh
Posts: 114
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Re: 4L80E Trans Tunnel mods?
So sort of related....
I'm gonna dump the stock AC unit in favor of a Vintage Air unit. Going to keep the low mount because the turbo will be mounted passenger side high. Pretty sure I'm going with LSX Innovation multi postion motor mounts and I have read I need to make a few mods, first to the mount by cutting the front side off and then I might need to notch the cross member a little for the AC Unit. My question is if I move the motor back 1.5" will that interfere with the tunnel? |
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