4L80E Valve body question
Thread Starter
Launching!
Joined: Feb 2015
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4L80E Valve body question I currently have a 4L80 from a 2007 Express van. When I bought the transmission I didn’t know that the valve body would not allow me to manually select first and second gear. This is done electronically on newer 4L80’s. Is it possible to swap the valve body with an older model so I can get the manual control? Anyone with experience?
Last edited by L92 OLDS; Jun 30, 2021 at 12:43 PM.
TECH Junkie
Joined: Dec 2012
Posts: 3,615
Likes: 1,327
From: Iowa
it's in the tune
fix the tune
All 4l80e have a "safety shift" setup that will shift you out of a lower gear if the rpm/mph/throttle position is such that the engineers at GM deemed it "unsafe" for the engine
it also obviously won't let you downshift into those ranges either if the parameters aren't right.
this has been a "feature" since th400's and th350's
fix the tune
All 4l80e have a "safety shift" setup that will shift you out of a lower gear if the rpm/mph/throttle position is such that the engineers at GM deemed it "unsafe" for the engine
it also obviously won't let you downshift into those ranges either if the parameters aren't right.
this has been a "feature" since th400's and th350's
Thread Starter
Launching!
Joined: Feb 2015
Posts: 245
Likes: 21
it's in the tune
fix the tune
All 4l80e have a "safety shift" setup that will shift you out of a lower gear if the rpm/mph/throttle position is such that the engineers at GM deemed it "unsafe" for the engine
it also obviously won't let you downshift into those ranges either if the parameters aren't right.
this has been a "feature" since th400's and th350's
fix the tune
All 4l80e have a "safety shift" setup that will shift you out of a lower gear if the rpm/mph/throttle position is such that the engineers at GM deemed it "unsafe" for the engine
it also obviously won't let you downshift into those ranges either if the parameters aren't right.
this has been a "feature" since th400's and th350's
TECH Junkie
Joined: Dec 2012
Posts: 3,615
Likes: 1,327
From: Iowa
post a picture of the external and internal linkage
is this still in an express van?
I've been in plenty of 80e from 2008/9 and this would be the first I've seen that wouldn't physically allow D2 or D1
is this still in an express van?
I've been in plenty of 80e from 2008/9 and this would be the first I've seen that wouldn't physically allow D2 or D1
Thread Starter
Launching!
Joined: Feb 2015
Posts: 245
Likes: 21
I was wrong about the year. It is from a 2007 Espress van (see below). It is in my G body 442 and is controlled with an E38 / T42
Last edited by L92 OLDS; Jun 30, 2021 at 01:24 PM.
Thread Starter
Launching!
Joined: Feb 2015
Posts: 245
Likes: 21
It’s in the car now full of fluid so I’m not going to pull the pan just to get a pic of the comb. I’ll try to take a video showing the detent positions and how it stops at Drive. I have Hurst Olds lightning rods in the car and would like to use them for 1-2 manual shifts.
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TECH Junkie
Joined: Dec 2012
Posts: 3,615
Likes: 1,327
From: Iowa
Well...to change a valve body...you're going to need to drop the pan anyway.
to answer your question...yes you should be able to switch valve body no problem
but...I don't think that is your issue. I believe it to be a linkage issue. Either a weird comb, something binding, something blocked, etc
to answer your question...yes you should be able to switch valve body no problem
but...I don't think that is your issue. I believe it to be a linkage issue. Either a weird comb, something binding, something blocked, etc
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TECH Junkie
Joined: Jun 2008
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From: Nitro Alley
I left GM by this point in time...
However, I tried to stay up to date on the 4L80E until production concluded.
If I recall correctly... the Roster-Comb never changed.
Only the Gear-Selector did.
There was a similar change with some Corvettes and the 4L60E for Paddle-Shifting.
However, I tried to stay up to date on the 4L80E until production concluded.
If I recall correctly... the Roster-Comb never changed.
Only the Gear-Selector did.
There was a similar change with some Corvettes and the 4L60E for Paddle-Shifting.
yeah instead of saying D3/D2/D1 the dash indicator says M, much like on the 6 speed equipped vans. ive never actually driven one however, usually they are totalled by the time they get to me
TECH Junkie
Joined: Dec 2012
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From: Iowa
OP is saying when he disconnects the shift linkage and moves the linkage down at the trans itself, he only gets P-R-N-OD-D3
can't get into D2 or D1
that implies that there is something in the linkage not allowing it
I've never seen this personally and would love some pictures of what he has going on
can't get into D2 or D1
that implies that there is something in the linkage not allowing it
I've never seen this personally and would love some pictures of what he has going on
TECH Junkie
Joined: Jun 2008
Posts: 3,202
Likes: 1,390
From: Nitro Alley
The question is if a Rooster-Comb with ONLY two "Drive-Ranges" was also used (in the G/H Platform)...
I do not have any records of this ever occurring.
But that does not mean that an "Up-Fitter" did not make changes to the Transmissions (such as Quigley 4X4 did, by Up-Fitting selectable Four Wheel Drive Systems into G/H Vans; instead of All Wheel Drive Systems).