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Old 04-07-2007, 10:12 PM   #1 (permalink)
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Swap 4L80E to 700r4?

I have a 1991 GMC 3/4 ton 4x4 with a 4L80E transmission that needs to be replaced because i have lost reverse in it.
My problem is that finding another 4L80E in my area is next to impossible and to rebuild it is quite costly. now, i have a 700R4 that is in perfect shape but obviously there will be issues. Anyone with experience with this swap?

Last edited by thesubhumans; 04-07-2007 at 10:43 PM.
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Old 04-07-2007, 10:20 PM   #2 (permalink)
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where are you from?
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Old 04-07-2007, 10:22 PM   #3 (permalink)
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I'm in B.C.
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Old 04-07-2007, 10:23 PM   #4 (permalink)
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Fu$k if you were closer i know a guy that could rebuild it CHEAP
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Old 04-07-2007, 11:52 PM   #5 (permalink)
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Where in bc? I'm in Van and I an GM trans tech. I may be able to fix it cheap for you. I wouldn't put the 700r4 in, it would be too much work, but I might take it for trade on the 80 repair.
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Old 04-08-2007, 12:09 AM   #6 (permalink)
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Hey Jason, i'm in White Rock.
I would definatly go for that deal, i'll give you a call tomorrow morning.
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Old 04-08-2007, 12:18 AM   #7 (permalink)
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k, I'll be around
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Old 04-08-2007, 12:42 AM   #8 (permalink)
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i agree with tpi boy. fix whats in it. it will be more headache then its worth to put in the 700r4 and you'll be happier to just fork over some cash to get the 4l80e fixed
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Old 04-08-2007, 01:25 AM   #9 (permalink)
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If you cooked a 14FF would you replace it with a 10b?

I didn't think so.
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Trail Rig: 1997 K1500 LQ9/4l80e/NP241/D60/14FF and some stuff in between

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Old 04-08-2007, 09:36 AM   #10 (permalink)
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Do you need the overdrive?? becasue if you dont a turbo 400 might be the ticket .
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Old 04-08-2007, 12:34 PM   #11 (permalink)
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How many KMs are on the truck? I've found the 4L80e's like to die around 250 000-300 000, especially when they're not cared for.
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Old 04-08-2007, 03:56 PM   #12 (permalink)
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Hey guys, thanks for all the help. I've decided to get the 4l80e rebuilt by tpi_boy.

The truck has 280 000 km on it btw
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Old 04-08-2007, 04:11 PM   #13 (permalink)
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rear band most likely broke and possibly the direct clutch. Be sure to check the pump deck for flatness.
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Old 04-08-2007, 11:20 PM   #14 (permalink)
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Ya, I have it now, I'll pull it apart tues for him and check the damage. The reverse boost valve wears bad on these and the line pressure gets too high in reverse, causes the servo piston to crack or the band to break. Thats what I expect to see anyway. I'll keep you guys upto date on it if you want, just for entertainment
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