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Transmissions and Drivetrain Need help with your trans? Problems with your axle?

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Old 10-25-2009, 09:11 PM   #1
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Join Date: May 2009
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Car: 1990 Iroc
Engine: 383
Transmission: th400
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4l80e

Has anyone tried or put a 4l80e in their 3rd gen? What can I expect if I try and put one in? I know I will have to make trans mount different on crossmember. But as far as fitting next to floor pan, will I have any mods to do?
Thanks Dusty
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Old 10-25-2009, 09:47 PM   #2
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Location: 51°N 114°W, 3500'
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Car: 87 IROC L98
Engine: 582 Alcohol BBC
Transmission: Powerglide
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Re: 4l80e

Quote:
Originally Posted by Dustytrix View Post
will I have any mods to do?
Lots. It's a big heavy transmission.

As always, it's suggested that you use the search function to find other threads related to your question. It's not the first time it's been asked.
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Old 10-25-2009, 09:58 PM   #3
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Re: 4l80e

Thanks Stephen, I used the search function and only got one article by Mac (installing 4l80e)
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Old 10-25-2009, 10:01 PM   #4
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Re: 4l80e

My bad I put 480le instead of 4l80e. Thats why I got only one answer by Mac
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Old 10-26-2009, 10:17 PM   #5
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Re: 4l80e

search topradman's user profile. He had a long article with pictures about what he did to get one in his IROC. The 4L80 is a very heavy duty trans, from what I know it's the same guts as a TH400 just with adjustable line pressure
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Old 10-26-2009, 10:32 PM   #6
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Re: 4l80e

My dad has one in a work truck that had just been rebuilt when the engine chunked a rod. If you are interested I can see what he would take for it. The truck is in Philadelphia Ms
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Old 10-26-2009, 10:32 PM   #7
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Re: 4l80e

About 80% of the internal parts are the same however the electronic valve body makes the valve body much bigger. Add in the OD and the tranny becomes bigger.

Estimated weight of a complete 4L80E is around 250 pounds. A TH400 is only 130. My powerglide is around 95
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Old 10-27-2009, 01:38 AM   #8
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Re: 4l80e

as a builder building the guts all the way up to the overdrive section is approximately the same as a th400. After that it changes a lot. In all I'd say approx. 60% is the same at best. Seen a lot of 4L80E's lately with no reverse engagement. sad . but fixable.
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Old 10-28-2009, 09:40 PM   #9
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Re: 4l80e

Thanks for the replies I have also read its only 40lbs heavier than 700r, but I have all 3 and will put them on a scale then I will know. The reason I am interested is the heavy duty (withoverdrive) if weight is such a big deal I can always ditch someother part of the car.Just wanting one of the best long term strongest tranny to fit in a 3rd gen car.
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3rd, 480le, 4l80e, 87, 91, body, camaro, gen, powerglide, put, reverse, transmission, truck, upgrade, valve, weight
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