4l80e takeoff feels like in 3rd
Thread Starter
Teching In
Joined: May 2025
Posts: 15
Likes: 4
4l80e takeoff feels like in 3rd hey guys me again.. so i rebuild this 4l80e for a buddy nothing crazy just a stock 3500 dump truck. did a full rebuild bushings, clutchs, steels, pistons, seals etc. i dual fed the unit since its for a dump truck gonna haul trailers and be loaded. everything went right clutch clearances forward and direct about .050 5 clutch bw frictions. i vaccum tested the valve body everything held decent so i ran it.. btw trans wasn’t that bad before the rebuild just was due hard lip seals and clutchs were slipping forsure. installed back in the truck once i got fluid level right i went to pull it out the shop and engaged reverse fine like normal. once i put it in drive it felt like it was in 3rd or 4th gear really heavy… checked for codes no codes. checked if the speed sensors were reading they were. i tried manually putting in 1st nothing the same deal HEAVY. i put it manually in 2nd and it felt better a bit. so i put the pressure gauge and i was getting around 40psi in park 60psi in reverse and around the same in every other gear. i unplugged the transmission and checked pressures like that and was around 180psi in park 200-210 ish reverse and around the same in drive which looked good to me. once i would it in boom back to 40psi low pressures.
ive build 80es before and never had this issue. i’ve been looking around if anyone had this issue and can’t seem to find anything. any input will help thanks.
ive build 80es before and never had this issue. i’ve been looking around if anyone had this issue and can’t seem to find anything. any input will help thanks.
Thread Starter
Teching In
Joined: May 2025
Posts: 15
Likes: 4
hey guys me again.. so i rebuild this 4l80e for a buddy nothing crazy just a stock 3500 dump truck. did a full rebuild bushings, clutchs, steels, pistons, seals etc. i dual fed the unit since its for a dump truck gonna haul trailers and be loaded. everything went right clutch clearances forward and direct about .050 5 clutch bw frictions. i vaccum tested the valve body everything held decent so i ran it.. btw trans wasn’t that bad before the rebuild just was due hard lip seals and clutchs were slipping forsure. installed back in the truck once i got fluid level right i went to pull it out the shop and engaged reverse fine like normal. once i put it in drive it felt like it was in 3rd or 4th gear really heavy… checked for codes no codes. checked if the speed sensors were reading they were. i tried manually putting in 1st nothing the same deal HEAVY. i put it manually in 2nd and it felt better a bit. so i put the pressure gauge and i was getting around 40psi in park 60psi in reverse and around the same in every other gear. i unplugged the transmission and checked pressures like that and was around 180psi in park 200-210 ish reverse and around the same in drive which looked good to me. once i would it in boom back to 40psi low pressures.
ive build 80es before and never had this issue. i’ve been looking around if anyone had this issue and can’t seem to find anything. any input will help thanks.
ive build 80es before and never had this issue. i’ve been looking around if anyone had this issue and can’t seem to find anything. any input will help thanks.
