Need 4L80E retrofit advice - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davepl · 02-09-2016, 08:43 PM

It appears my newly rebuilt 200-4R bit the dust in some form today - both forward and reverse, so it could be converter issue or a pump issue or who knows what. But I think it's time for the big boy. I have 4.88s predicated on the overdrive, otherwise I'd probably go back to the factory TH400.

So, if I go 4L85E (or 4L80E), a couple of questions:

a) What do you recommend for a TPS? I imagine the controllers are all all going to require it, unless some work on a MAP sensor.

b) Any big "gotchas" on fitment? It's a TH400 truck originally, so high hump.

Thanks!
Dave

Andy4639 · 02-09-2016, 08:56 PM

Mine went right in with no problems. I have the low hump. I love it. It's better than the 700-R4 I had before.

**57taskforce** · 02-09-2016, 10:05 PM

You won't be disappointed Dave. I can't comment on the install but I've got two of them in their oem homes and they both have well over 200,000 behind a 7.4 and an 8.1 without ever being rebuilt.

02-09-2016, 08:43 PM	#1
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,334	Need 4L80E retrofit advice It appears my newly rebuilt 200-4R bit the dust in some form today - both forward and reverse, so it could be converter issue or a pump issue or who knows what. But I think it's time for the big boy. I have 4.88s predicated on the overdrive, otherwise I'd probably go back to the factory TH400. So, if I go 4L85E (or 4L80E), a couple of questions: a) What do you recommend for a TPS? I imagine the controllers are all all going to require it, unless some work on a MAP sensor. b) Any big "gotchas" on fitment? It's a TH400 truck originally, so high hump. Thanks! Dave __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

02-09-2016, 08:56 PM	#2
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Need 4L80E retrofit advice Mine went right in with no problems. I have the low hump. I love it. It's better than the 700-R4 I had before. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

02-09-2016, 10:05 PM	#3
57taskforce All about them K’s Join Date: Jun 2014 Location: Land of Entrapment Posts: 6,512	Re: Need 4L80E retrofit advice You won't be disappointed Dave. I can't comment on the install but I've got two of them in their oem homes and they both have well over 200,000 behind a 7.4 and an 8.1 without ever being rebuilt. __________________ Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s



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