TurboTim

iTrader: (1)

I rebuilt my first transmission and installed Jakes D3 transbrake in a 4L80E. I just got it put in and crossmember made this week. I have not driven it or anything yet because I dont know if the fluid is over/under filled so this may be irrelevant when I get the dipstick but it seems to creep forward on the transbrake. The only thing I wasnt 100% sure with was the band adjustment so I left it as is when rebuilding since its adjustable fairly easily. Could this be why it creeps forward?

jakeshoe

iTrader: (14)

It could be a band adjustment but you're putting the cart before the horse.

An automatic transmission ABSOLUTELY must have proper fluid fill. It results in INSTANT damage to the frictions to apply power and they not have proper pressure due to low fluid.

TurboTim

iTrader: (1)

Yeah that is why I didnt actually drive it or lay sure power into it. Will update when I get the proper dipstick.

TurboTim

iTrader: (1)

So got the proper fluid level in and it still rolls forward on the brake. Any ideas. Jake that converter I got feels amazing! Really woke the car up!

jakeshoe

iTrader: (14)

You need to check pressure.
Does it go into reverse OK?

TurboTim

iTrader: (1)

Yes goes into reverse fine when button is pressed. What is best way to go about checking pressure? Sorry this is all new to me....

mrvedit

The ATD-5550 trans pressure gauge ($35 on Amazon) connects to the pressure fitting on the case. It includes a long 6' hose so that you can even check pressure while driving.

TurboTim

iTrader: (1)

I have an oil pressure gauge that goes to 150psi. Is it just 1/8th NPT somewhere on case?

jakeshoe

iTrader: (14)

150 psi isn't enough.

Driver's side of case above shift shaft.

TurboTim

iTrader: (1)

I got 270 in park, 240 in Reverse and 190 in drive. What pressures do you want to see or look at?