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i have a 2005 4l80e 2wd new rebuild following nicks tranmission build on you tube. did the dual feed mod also.
i am having an issue in d4 and reverse. pull the shifter into reverse, can feel the transmission engage into reverse and it will move on flat surface
with no throttle, as soon as give a little throttle just revs up. pull shifter into d4, it will do the exact same thing as reverse. pull the shifter into 3 engages and moves.
pull shifter into 2 engages and moves. pull shifter into 1 engages and moves. converter is spaced correctly.
not new at building transmissions, just our 3rd 4l80e. other 2 just fine. check ***** are correct, already pulled back down a verified, no reverse check ball.
any idea where i can start chasing my mistake.
forgot to mention i am using the transgo hd2 spacer plate and gaskets, boost valve, and case ring. not using all hd2 parts
Last edited by bisqikss; Oct 10, 2023 at 01:45 PM.
Reason: forgot information
i have a 2005 4l80e 2wd new rebuild following nicks tranmission build on you tube. did the dual feed mod also.
i am having an issue in d4 and reverse. pull the shifter into reverse, can feel the transmission engage into reverse and it will move on flat surface
with no throttle, as soon as give a little throttle just revs up. pull shifter into d4, it will do the exact same thing as reverse. pull the shifter into 3 engages and moves.
pull shifter into 2 engages and moves. pull shifter into 1 engages and moves. converter is spaced correctly.
not new at building transmissions, just our 3rd 4l80e. other 2 just fine. check ***** are correct, already pulled back down a verified, no reverse check ball.
any idea where i can start chasing my mistake.
forgot to mention i am using the transgo hd2 spacer plate and gaskets, boost valve, and case ring. not using all hd2 parts
My Guess would be Input sprag not holding . Its nessessary for rev and d4 forward gears. Even if new particulary after market I will only use GM for the late type as we got hold of a few after market ones and they very simply did nothing and we had the syptoms you have on the dyno when in D3 D2 D1 the overun clutch takes over and thats why you can move normally then.
__________________ Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
i have a 2005 4l80e 2wd new rebuild following nicks tranmission build on you tube. did the dual feed mod also.
i am having an issue in d4 and reverse. pull the shifter into reverse, can feel the transmission engage into reverse and it will move on flat surface
with no throttle, as soon as give a little throttle just revs up. pull shifter into d4, it will do the exact same thing as reverse. pull the shifter into 3 engages and moves.
pull shifter into 2 engages and moves. pull shifter into 1 engages and moves. converter is spaced correctly.
not new at building transmissions, just our 3rd 4l80e. other 2 just fine. check ***** are correct, already pulled back down a verified, no reverse check ball.
any idea where i can start chasing my mistake.
forgot to mention i am using the transgo hd2 spacer plate and gaskets, boost valve, and case ring. not using all hd2 parts
Application chart in this pic as you can see the input sprag in OD must hold in forward d4 and rev
__________________ Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
ok. finally got the transmission pulled back out. and it was just something simple. the overdrive clutch roller assembly(512) was not behind the teeth of the overrun clutch housing(504). when you install the overdrive clutch roller assembly, twist the clutch assembly counterclockwise until it stops then install the overdrive carrier assembly. what happend to me was that the rollers were not where they were supposed to be and it let the overdrive carrier assembly(514) spin both ways, and not catch. hope this helps other people that have the same problem as me. it was something so simple, hard to believe it would cause so much problems. ill try to attach a picture.
Last edited by bisqikss; Oct 20, 2023 at 02:09 PM.
Reason: no longer need picture
ok. finally got the transmission pulled back out. and it was just something simple. the overdrive clutch roller assembly(512) was not behind the teeth of the overrun clutch housing(504). when you install the overdrive clutch roller assembly, twist the clutch assembly counterclockwise until it stops then install the overdrive carrier assembly. what happend to me was that the rollers were not where they were supposed to be and it let the overdrive carrier assembly(514) spin both ways, and not catch. hope this helps other people that have the same problem as me. it was something so simple, hard to believe it would cause so much problems. ill try to attach a picture.
Good you found it and seems iI was close, Knew it had to be in that area.
__________________ Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
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4l80e new build slipping in d4 and reverse HELP 
