making it easer to remove 4l8OE trans - ZR-1 Net Registry Forums

aafc · 06-17-2021

I went drag racing on May 15th at Orlando Speed World. Had a great time, but
I could not hold the car when staged at more then 1800-2000 rpm it would
push through the brakes. The the torque convertor is too tight, so I removed
the transmission to remove the torque convertor to have it "loser"(higher
launch rpm 2500-2800 rpm).While that was being done being that the
headers were out of the car I had them modified so I can remover the
transmission without taking the headers off. I just pull the collectors off and
the transmission comes right out. (saves me about 1.5 hours be doing this.

Header modification pictures

sleazy rider · 06-17-2021

maybe it's just me, but i cannot open the attachments.

aafc · 06-26-2021

Modified Jeal headers installed with transmission for mock up (no torque
convertor still being serviced).
first and second photo passenger side
third and fourth photo driver side

This will make it quicker to remove transmission for service later on if
I need to.

John
one of a few 4l8OE EQ ZR-1's
white/black # 2546

sleazy rider · 06-26-2021

years ago when we were racing my 72 lt-1, i was going thru a clutch about every month during racing season. it was always a pita to get the transmission out of the way to pull the bell housing and clutch. what we ended up doing was to cut the center section out of the transmission support beam and added tubing and bolts to be able to drop that piece and the transmission easily. one time at irp in indianapolis we changed the clutch out between runs.
ya' gotta do what ya' gotta do!
in your case it was the collectors that were cut. that's thinking outside the box.

aafc · 02-10-2022

Update on header mods
last year I had the headers cut and made slip on collectors. Well it
worked good but I could not get the slip on collectors to seal for very
long. Whih caused a lean signal to the ecm ( headers were sucking air
before the O2 sensors). I would have to reseal the collectors about
every 3 -4 months. So checking around I found a water jet company
that could make flanges on the header and collector so they would bolt
together with gasket between them
They did a beautiful job of making flanges so they could bolt together
also made up a dozen gaskets and each gasket is exactly the same
for driver and passenger.

picture of driver side with collector bolted on.

http://www.zr1.net/forum/picture.php...pictureid=4677

aafc · 02-17-2022

Just finished installing modified Jeal headers with bolt on collectors. ran car
for about 15 min per engineering manufacturer so gaskets seal, then
checked that the 6 stainless steel bolts are tight on both collectors.
Everything checks out good , no leaks o2 sensor are good A/F readings
are in range.

http://www.zr1.net/forum/picture.php...pictureid=4681

06-17-2021	#1
aafc Join Date: Feb 2010 Location: Ochlocknee, GA Posts: 435	making it easer to remove 4l8OE trans I went drag racing on May 15th at Orlando Speed World. Had a great time, but I could not hold the car when staged at more then 1800-2000 rpm it would push through the brakes. The the torque convertor is too tight, so I removed the transmission to remove the torque convertor to have it "loser"(higher launch rpm 2500-2800 rpm).While that was being done being that the headers were out of the car I had them modified so I can remover the transmission without taking the headers off. I just pull the collectors off and the transmission comes right out. (saves me about 1.5 hours be doing this. Header modification pictures Last edited by aafc; 06-17-2021 at 08:39 PM. Reason: post pic

06-17-2021	#2
sleazy rider Join Date: Jan 2020 Location: conroe, tx Posts: 87	Re: making it easer to remove 4l8OE trans maybe it's just me, but i cannot open the attachments.

06-26-2021	#3
aafc Join Date: Feb 2010 Location: Ochlocknee, GA Posts: 435	Re: making it easer to remove 4l8OE trans Modified Jeal headers installed with transmission for mock up (no torque convertor still being serviced). first and second photo passenger side third and fourth photo driver side This will make it quicker to remove transmission for service later on if I need to. John one of a few 4l8OE EQ ZR-1's white/black # 2546 Last edited by aafc; 06-26-2021 at 01:55 PM.

06-26-2021	#4
sleazy rider Join Date: Jan 2020 Location: conroe, tx Posts: 87	Re: making it easer to remove 4l8OE trans years ago when we were racing my 72 lt-1, i was going thru a clutch about every month during racing season. it was always a pita to get the transmission out of the way to pull the bell housing and clutch. what we ended up doing was to cut the center section out of the transmission support beam and added tubing and bolts to be able to drop that piece and the transmission easily. one time at irp in indianapolis we changed the clutch out between runs. ya' gotta do what ya' gotta do! in your case it was the collectors that were cut. that's thinking outside the box.

02-10-2022	#5
aafc Join Date: Feb 2010 Location: Ochlocknee, GA Posts: 435	Re: making it easer to remove 4l8OE trans Update on header mods last year I had the headers cut and made slip on collectors. Well it worked good but I could not get the slip on collectors to seal for very long. Whih caused a lean signal to the ecm ( headers were sucking air before the O2 sensors). I would have to reseal the collectors about every 3 -4 months. So checking around I found a water jet company that could make flanges on the header and collector so they would bolt together with gasket between them They did a beautiful job of making flanges so they could bolt together also made up a dozen gaskets and each gasket is exactly the same for driver and passenger. picture of driver side with collector bolted on. http://www.zr1.net/forum/picture.php...pictureid=4677

02-17-2022	#6
aafc Join Date: Feb 2010 Location: Ochlocknee, GA Posts: 435	Re: making it easer to remove 4l8OE trans Just finished installing modified Jeal headers with bolt on collectors. ran car for about 15 min per engineering manufacturer so gaskets seal, then checked that the 6 stainless steel bolts are tight on both collectors. Everything checks out good , no leaks o2 sensor are good A/F readings are in range. http://www.zr1.net/forum/picture.php...pictureid=4681