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November 26th, 2010, 12:15 PM
I have been searching here and that's how I came up with some of the ideas I will mention in this post.
My truck has developed a very noticeable and annoying transmission malfunction. The symptoms have appeared gradually and I am thinking and hoping they are related. Recently I have noticed that any time I floor it does not downshift into 2nd or 1st gear like it used to, rather it hesitates for 2 seconds then goes into a high gear like 3rd or 4th. It also hesitates for 2 seconds from a very low rolling speed before it goes into 1st gear and starts accelerating hard when floored. And I notice that now when I hit tow/haul the rpms don't increase and I don't feel a lockup although it still holds the gears longer. That's why I thought it was the TC. The engine is fine and accelerates very well for what it is when it goes through the gears.
The truck is a 2003 4.8 with 3.42s and mostly stock. A crappy loud exhaust system and a home made tune is about all the mods. While the tune is wack, it was shifting fine on the same tune for a long time, so it has to be a mechanical malfunction.
The first thing I noticed months ago was that it doesn't shift hard enough on the 1-2. Also, tow/haul acts really funny and too jerky / bumpy on shifts. Next, regular shifts became harsh, especially cruising into 2nd, a big bump. Now this no downshifting at all deal, as if I'm not flooring it. Some variables are that a while ago I changed the filter and swapped some new fluid in. I know that can dissolve more crap in the trans and plug the valve body and new filter. Also, I have a mass airflow code P0101 due to massive VE table mods in my tune, but before you think anything the truck ran and shifted fine for a long time on the same tune before this issue developed.
My truck has 110,000 miles and I drive aggressively. I have all tranny protection removed from the tune. I am thinking the TC can't make enough pressure?? I would love to replace it with maybe a 3000 Yank stall?? Thanks!
My truck has developed a very noticeable and annoying transmission malfunction. The symptoms have appeared gradually and I am thinking and hoping they are related. Recently I have noticed that any time I floor it does not downshift into 2nd or 1st gear like it used to, rather it hesitates for 2 seconds then goes into a high gear like 3rd or 4th. It also hesitates for 2 seconds from a very low rolling speed before it goes into 1st gear and starts accelerating hard when floored. And I notice that now when I hit tow/haul the rpms don't increase and I don't feel a lockup although it still holds the gears longer. That's why I thought it was the TC. The engine is fine and accelerates very well for what it is when it goes through the gears.
The truck is a 2003 4.8 with 3.42s and mostly stock. A crappy loud exhaust system and a home made tune is about all the mods. While the tune is wack, it was shifting fine on the same tune for a long time, so it has to be a mechanical malfunction.
The first thing I noticed months ago was that it doesn't shift hard enough on the 1-2. Also, tow/haul acts really funny and too jerky / bumpy on shifts. Next, regular shifts became harsh, especially cruising into 2nd, a big bump. Now this no downshifting at all deal, as if I'm not flooring it. Some variables are that a while ago I changed the filter and swapped some new fluid in. I know that can dissolve more crap in the trans and plug the valve body and new filter. Also, I have a mass airflow code P0101 due to massive VE table mods in my tune, but before you think anything the truck ran and shifted fine for a long time on the same tune before this issue developed.
My truck has 110,000 miles and I drive aggressively. I have all tranny protection removed from the tune. I am thinking the TC can't make enough pressure?? I would love to replace it with maybe a 3000 Yank stall?? Thanks!