Looking for some help. My tranny is acting odd. I put in drive and seems to slip a lot in 1st, barely even move at some times. If I put it in 1st with the shifter it goes in and grabs then I can shift up to 2nd or drive and there aren't problems. It drives normally when not from dead stop.

Transmission has 50k miles on it since replacement. Fluid level is normal. I don't tow and drive it particularly hard. I will have to go back and look at miles since last fluid change. I should be right around 30k miles since last change.

Any thoughts or trouble shooting ideas?

 

Put a 0-350 PSI gauge in the test port. What are the pressures at idle and at stall? Stall is when you put it in drive and press the brake pedal as hard as you can and then press the go pedal to the floor FOR NO MORE THAN 5 SECONDS!

 

I don't have a PSI gauge to use... What do you think it could be? I also notice it works to put in drive and the issue is mainly going from reverse to drive. It works fine when I start from park but not reverse to park... drives normal when it gets going or when from park...

 

Just need some hose and a couple of fittings
Valley Instrument Grade A Stem Mount 2 1/2in. Glycerin Filled Gauge — 0-400 PSI | Hydraulic Gauges| Northern Tool + Equipment

 

Well since you can't get any information to help diagnose what's wrong, I'll have to make an educated guess based on what I know about your trans.

Something is wrong.

Without data that's about as specific as I can get. I'm fairly confident a complete rebuild will fix it. With data it I might have a suggestion that is a lot less expensive.

 

OK, thanks. I will see if I can get it done. Thanks again.

 

well put

 

Mine does the same exact thing randomly about once a week

 

Here is a visual aid to assist with the test Mr. K talked about above. Post your results and he is always willing to provide input based on results.


I will add, when the plug is placed back into the transmission, use a thread sealer (NOT PIPE DOPE - I've seen that before) to prevent it from loosening over time.

 

This is also where my trans temp guage is installed

 

You can go to Napa and get what you need for this for around 30$

 

I ended up taking truck to local shop, I've been traveling and kids keep me busy so let someone else try. Shop recommending rebuild based on the pressure line test results:

park 60PSI
1st 105PSI
reverse 60PSI

No stall test do to results at idle.

The rebuild is $2,670 out the door plus tax. Includes the following upgrades:
Timken bearing kit
Hayden Automotive 679 Rapid-Cool Plate and Fin Transmission Cooler
rear main seal
Board Warren ? clutch plates (couldn't find with a quick look so spelled wrong)
torque converter has asbestos - said it was better than stock
shift kit

Thoughts on moving forward with rebuild?