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

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



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