Another Tranny issue

[military tundra]

I know people have talked about the tranny shifting in strange places during accel but has anyone else had the problem of hard downshifting while coasting down a hill or a small rise for that matter. It feels like I have a Jake brake installed and I don't think I paid extra for that. I am taking it in to the dealer in the morning. I just wanted to know if anyone else has this experience.

[jpnca]

Love the Jake Break at work but I've not seen it on a Gas motor yet.

[toytech19]

Its A Standard Feature On The 6 Speed Transmission They Are Not Like Five Speeds The Trans Will Down Shift To Keep Throttle Responce There And The Dealer Might Warranty A Trans Or Update The Ecm But It Should Do It

[military tundra]

I got my truck back this afternoon and they reprogrammed the ECM and they did tell me that the down shift if standard. Also they presurrized my tires to 36 PSI and the ride is mu better than when it was at 41 PSI. Still a good bit of vibration on concrete interstate but much better. I still love this truck.

[Prlauren]

I'm a mechanic and I noticed the problem on my Truck. I have the CrewMax and I decided to climb under and see. I did notice that it's a two piece driveshaft with a carrier bearing. This may only be on the Crewmax because of the wheelbase....but i'm not sure positively. I noticed the two driveshafts were not in-line with each other. The reason I checked is because I noticed a hard shift early in the morning and when the transmition decides to shift or downshift. This is not in all gears only the first three that i noticed. I loosened the two bolts holding the carrier bearing to the body and aligned the two driveshafts by eye. The hard shifting went away. So I then properly aligned the driveshaft by measuring and the hard shifting is alot less. The other thing I noticed was the truck under a load causes the rear to have what they call "Axle wrap" this can be solved with better leaf springs, or airbags, or leaf helpers. The only draw back to doing this is you may amplify the bed bounce.....won't know till someone tries. I heard "Deaver" Makes the best leaf springs they will also custom make them...I may try it soon.