4l80e - Pirate4x4.Com : 4x4 and Off-Road Forum

thesubhumans · 04-07-2007, 09:12 PM

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?

ID · 04-07-2007, 09:20 PM

where are you from?

thesubhumans · 04-07-2007, 09:22 PM

I'm in B.C.

ID · 04-07-2007, 09:23 PM

Fu$k if you were closer i know a guy that could rebuild it CHEAP

tpi_boy · 04-07-2007, 10:52 PM

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.
Jason 778-999-3362

thesubhumans · 04-07-2007, 11:09 PM

Hey Jason, i'm in White Rock.
I would definatly go for that deal, i'll give you a call tomorrow morning.

tpi_boy · 04-07-2007, 11:18 PM

k, I'll be around

odin544 · 04-07-2007, 11:42 PM

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

bggrnchvy · 04-08-2007, 12:25 AM

If you cooked a 14FF would you replace it with a 10b?

I didn't think so.

oldrivers · 04-08-2007, 08:36 AM

Do you need the overdrive?? becasue if you dont a turbo 400 might be the ticket .

morgsie · 04-08-2007, 11:34 AM

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.

thesubhumans · 04-08-2007, 02:56 PM

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

KILLER"B"3 · 04-08-2007, 03:11 PM

rear band most likely broke and possibly the direct clutch. Be sure to check the pump deck for flatness.

tpi_boy · 04-08-2007, 10:20 PM

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

Jason

04-07-2007, 09:12 PM	#1 (permalink)
thesubhumans Registered User Join Date: Jan 2007 Member # 84888 Posts: 4	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 09:43 PM.

04-08-2007, 12:25 AM	#9 (permalink)
bggrnchvy Rock God Join Date: Jan 2005 Member # 41764 Location: Bay Area, CA Posts: 2,033	If you cooked a 14FF would you replace it with a 10b? I didn't think so. __________________ Tow Rig: 2006 Dodge 2500 610CTD/G56/NP271/AAM9.25/AAM11.5 Trail Rig: 1997 K1500 LQ9/4l80e/NP241/D60/14FF and some stuff in between No one is ever gone if they are always remembered. JasonPayneMemorial

04-08-2007, 03:11 PM	#13 (permalink)
KILLER"B"3 Registered User Join Date: Oct 2005 Member # 54970 Location: Nashville Tn. Posts: 415	rear band most likely broke and possibly the direct clutch. Be sure to check the pump deck for flatness. __________________ stuck in the garage

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04-07-2007, 09:20 PM	#2 (permalink)
ID Registered User Join Date: Oct 2006 Member # 81674 Location: columbus, MI Posts: 21	where are you from?

04-07-2007, 09:22 PM	#3 (permalink)
thesubhumans Registered User Join Date: Jan 2007 Member # 84888 Posts: 4	I'm in B.C.

04-07-2007, 09:23 PM	#4 (permalink)
ID Registered User Join Date: Oct 2006 Member # 81674 Location: columbus, MI Posts: 21	Fu$k if you were closer i know a guy that could rebuild it CHEAP

04-07-2007, 10:52 PM	#5 (permalink)
tpi_boy Registered User Join Date: Oct 2004 Member # 36845 Location: British Columbia Posts: 123	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. Jason 778-999-3362

04-07-2007, 11:09 PM	#6 (permalink)
thesubhumans Registered User Join Date: Jan 2007 Member # 84888 Posts: 4	Hey Jason, i'm in White Rock. I would definatly go for that deal, i'll give you a call tomorrow morning.

04-07-2007, 11:18 PM	#7 (permalink)
tpi_boy Registered User Join Date: Oct 2004 Member # 36845 Location: British Columbia Posts: 123	k, I'll be around

04-07-2007, 11:42 PM	#8 (permalink)
odin544 Registered User Join Date: Apr 2004 Member # 29622 Location: Kennewick, Washington Posts: 1,763	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

04-08-2007, 08:36 AM	#10 (permalink)
oldrivers Registered User Join Date: Mar 2004 Member # 28570 Posts: 129	Do you need the overdrive?? becasue if you dont a turbo 400 might be the ticket .

04-08-2007, 11:34 AM	#11 (permalink)
morgsie Registered User Join Date: May 2006 Member # 72374 Location: Canada Posts: 114	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.

04-08-2007, 02:56 PM	#12 (permalink)
thesubhumans Registered User Join Date: Jan 2007 Member # 84888 Posts: 4	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

04-08-2007, 10:20 PM	#14 (permalink)
tpi_boy Registered User Join Date: Oct 2004 Member # 36845 Location: British Columbia Posts: 123	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 Jason