Jump to content
Looking for Staff Members

Auto tranny problem

Posted

My trucks has been shifting funny, last night I thought it was going in and out of OD to drive. Today it seemed ok when i was just driving it normally around normally, but i was messing with shifting it on a flat streach of road and if I turn off the OD i can tell it goes into drive, but if i manually put it into 2nd itll rev for a second and then its like being in neutral, but if i manually put it into first I can tell it drops into first and revs. And its the same starting from a stop. If i put the truck manually into first and pull out i can tell its in first, then if i shift to second its like hitting neutral, and then when i manually put it into drive you can tell it goes into drive and then od. I scanned it and its not pulling any codes up. So is my 2nd gear fried and i need the tranny rebuilt or could it be a computer issue but not have a code.

  • Replies 8
  • Views 1.6k
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Featured Replies

Honestly no idea . Get a gauge on your test port and check line pressures.

  • Author

I have plenty of power, and i have a fuel gauge on the low side and i have 15lbs or so which is normal for my truck, and my inj pump is only about a yr old, not saying that it couldnt go in a year, but its acting more like shifting problems then fuel.

I have plenty of power, and i have a fuel gauge on the low side and i have 15lbs or so which is normal for my truck, and my inj pump is only about a yr old, not saying that it couldnt go in a year, but its acting more like shifting problems then fuel.

:lmao:
  • Author

:lmao:

Dont need your sarcasim.... and ive of used a cute little icon but they dont have one waving with just one finger

--- Update to the previous post...

No.

Line pressure of your transmission.

Not fuel.

LOL I dont know why I didnt think of that! i wonder if my friend has a gauge for that, do you have any idea what the pressure should be?

You need a copy of the FSM and if your using an aftermarket VB you need their specs.AUTOMATIC TRANSMISSION - 47RE 21 - 661(1) Turn OD switch off.(2) Leave vehicle on hoist and leave Gauge C-3292in place at accumulator port.(3) Move Gauge C-3293-SP over to front servo portfor this test.(4) Have helper start and run engine at 1600 rpmfor this test.(5) Move transmission shift lever two detents rearwardfrom full forward position. This is D range.(6) Read pressures on both gauges as transmissionthrottle lever is gradually moved from full forward tofull rearward position:² Line pressure at accumulator in D range thirdgear, should be 54-60 psi (372-414 kPa) with throttlelever forward and increase as lever is moved rearward.² Front servo pressure in D range third gear,should be within 3 psi (21 kPa) of line pressure up tokickdown point.My understanding on a STOCK VB is you want the line pressure to hold between 50-90psi (higher for modified VB).If line pressure is good you want to check the servo/pistons that help apply the bands.If they are working then adjust the bands to spec.Beyond that - I dont think you can really tell unless you pull it apart.Have you dropped the pan ? Anything in it and what is condition of fluid ? And also have you made sure you have enough fluid.

  • Author

(My understanding on a STOCK VB is you want the line pressure to hold between 50-90psi (higher for modified VB)

they suggest higher pressure but all i have is a stock lift and thats what it does.

Thanks I'll look into checking the pressure.

--- Update to the previous post...

As for the smiley yea we've got one... :nono::wink:

Thats not the one I was thinking of....
Go to topic listing