“Dual feed” TH400/4L80e

[@rynomighttransmissionsfabr6895]

Very well explained sir nice job!

[@jesscneal]

Good explanation. Thanks CV

[@mafosa8519]

What happens to reverse pressure. When you need to back up. The holes been blocked now. I’m just a passing through. Thanks for sharing. Larry

[@pmotorsports8276]

So effectively same as manual 3rd where direct drum is engaged also?!.

[@bigtires100]

If the idea of dual feeding the clutch pack is to add more surface area on the piston to be pressurized doesn't drilling a hole in the chamber that is being pressurized bleed off the pressure?

[@cameron878]

The bleed hole is a negligible pressure loss

[@atver300]

Great explanation thanks

[@jasonandjenparks1523]

Great video. Thanks for posting it.

[@b00st_SS]

Rebuilding a 4L80e, you think I will have any issues NOT drilling a bleed hole in the drum? I did dual feed as you described , but have seen others talk about drilling a hole but not explaining why it’s needed if I’m not running a trans brake

[@cameron878]

Keeps the piston from centrifugally applying the direct clutches when the transmission is in 1st gear and the direct drum is counter rotating 85ish% of input rpm. If you want your direct clutches to have the best chance at survival, drill the hole

[@b00st_SS]

@@cameron878 will do , thanks 🙏

[@rolandos64]

best explanation!!!

[@bcmedzis]

Great video, now show us how you get 6 frikshuns in 80e direct pls

[@ugd240000]

thanks a lot

[@Jearl_Black]

Also have got to drill a hole in the direct drum.......

[@cameron878]

It is not needed to do the dual feed. Dual feed just refers to how the fluid is applied to the direct piston. It (the 1/16” bleed) is not needed for a rebuild in an autoshift transmission that’s behind a stockish engine. Definitely required in anything performance or with a trans brake.

[@Jearl_Black]

@@cameron878 shit I did one today that way. Stock truck. Will it burn up the direct clutches?

[@cameron878]

@@Jearl_Black probably be fine. Giving it more line pressure helps

[@MonkeyFabGarage]

You better have dual fed my shit boss cus I’m sending it. 😎

[@tptrsn]

Thanks!!