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4L80e or 4L65e??????

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Old 11-16-2004, 09:56 PM
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boy all this talk about 65e's and 80e's. im running a 150 shot with an ext cab and i am snapping output shafts like pretzels. i am going to an 80e this time. i think that an output shaft isnt the builders fault--unless they do not install what was suppose to be in there--but either a weight to power ratio or just bad parts. the 60e commands around 26hp to turn. and 80e will command around 70hp to turn. hence i will go with a bigger shot maybe. but it is going to be a built 4l80 and i beleive that it should last for the life of the truck. as for the crossmember i am going to use a 2500hd member and drill the frame.
Old 11-16-2004, 10:57 PM
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If you change to a 80 what about the transfer case in my ss will it bolt up or will you have to go with a case out of a 80 trans and have to wire it up to go 4wd? Yes I broke my 65 last week and I am thinking of what to do also.
Old 11-16-2004, 11:03 PM
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as far as i know no one has figured out an ss 4l80e swap. you could do it but you will have to go with the tcase from an HD truck. you would be "locked" in then rather than the slipcase you have now.

i know there were several people looking to do a swap so maybe someone figured out what needs to be done to keep the awd tcase.
Old 11-17-2004, 09:36 AM
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Originally Posted by parish8
as far as i know no one has figured out an ss 4l80e swap. you could do it but you will have to go with the tcase from an HD truck. you would be "locked" in then rather than the slipcase you have now.

i know there were several people looking to do a swap so maybe someone figured out what needs to be done to keep the awd tcase.
Hit Man X posted this information on another forum...I thought that I had already posted it, but here it is again anyway:

Originally Posted by Hit Man X
Here's the email I received back from these guys the Trans Exc...all that's required is disassy. of the AutoTrac case and toss in this input gear. Hell, I don't see why it wouldn't work in place for the SS guys too with the AWD case. This piece is for like a 32T output that the 4L80E has vs the 27T the 4L60E has.



Hi Eric, our part # is GEA 19019. I believe that the OEM GM # is 12386258. This input is available for $106.00 + $11 S/H = $117.00.

We accept paypal,
Visa/MC/Disc/Amex (call toll free 866-847-5051 or 800-776-1191 ext. 79), money order, check (must include drivers license # and issuing state with check), and cash (at your own risk).
Thanks,

Spencer Hodes
Transmission Exchange Co.
1803 NE ML King Blvd
Portland, OR 97212
800-776-1191
Old 11-17-2004, 03:59 PM
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i have been posting up for a long time that i thought the cases looked very similer and wondered if the input gear could be swaped. thats prety cool! makes swaping an 80 into a 4wd or ss a little easier.
Old 11-18-2004, 07:49 AM
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What do you think the labor to change the input shaft in the transfer case would be. What do I need to do to the 80 to handle around 600 hp at the flywheel. Thanks
Old 11-18-2004, 08:49 AM
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that part number shows to be good for the NP1 rpo type 243C transfercase with 32 teeth spline.
Old 11-18-2004, 05:40 PM
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Originally Posted by 2bseen
What do you think the labor to change the input shaft in the transfer case would be. What do I need to do to the 80 to handle around 600 hp at the flywheel. Thanks
600fwhp. a shift kit and cooler.

my tranny went out at 600+rwhp but i believe it was due to the lock up clutch failure in the converter. if you plan on locking up the converter at WOT you need a good clutch set up.
Old 11-19-2004, 04:12 PM
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Is the stall the same in a 65 and 80, how many more #s does the 80 have.
Old 11-19-2004, 04:51 PM
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I'm not sure about the stall speeds, but the converters themselves are definitely different.


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