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hi new here, have a 2004 Tundra Dbl cab (2WD)...lately noticed that tranny 'bumps' ever so slightly, ex. coasting up to a red light and sometimes you can feel a 'bump' as the tranny shifts into first gear. Its never done that before and I've never had that happen on any other vehicle I've ever owned....also hard shifts during easy acceleration. Is this the LSD? How to check the fluid level? Forgive me for simple questions. Thanks in advance.
 

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if it's a 4x4, try searching for:

"lube slip yoke"

this is a well known issue most likely from what you describe. just don't over lube.

good luck.
 

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Seeing that yours is 2WD, there's no zerks :( for lubing points along the drive shaft if it's like mine. Dust covers also prevent me from seeing anywhere else to lube at either end of the drive shaft(s). That "bump" gets described here :confused: often, but I believe it's more commonly experienced while stopped, especially when the A/C is running. Overall, it appears to be an idiosyncrasy of the vehicle, not a problem with a readily known "fix".

Need to know more about the type of LSD your Tundra has. That, more about the bump, and the means for checking transmission fluid level can be found fairly easily :) here by searching. Besides a large group of friendly, experienced forum participants, TS also has a knowledge base for subscribers that can be really helpful, too. :tu:
 

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oops, sorry, i missed that it was 2wd.

not sure how the lsd would affect transmission shifting???

maybe someone else can chime in with an idea for you?

my 04 transmisison shifts very well. when it was new, it did a thing possibly similar to what you describe. mostly if i slowed down for a corner, it would hesitate slightly before it would catch when i reapplied the gas. it seemed like the torque converter wasn't locking up until the rpms went a little higher. the mechanics at the dealership "worked" on it several times and i think they adjusted something in the throttle sensors, but never could get them to tell me what they did. it still does this occasionally, but is much better now.

i had posted previously for anybody to post the procedure or repair manual entries for how the throttle sensors and step motor might affect the transmission shifting, but nobody ever replied. maybe there isn't any relationship and it's all done via ecu?

on older vehicles, there was an actually linkage between the throttle and transmission to help it know when to change gears for passing, etc. it actually affeced the pressure on the clutch packs somehow. my parents had to replace a transmission in a lincoln because the little grommet that held the shift-down rod to the throttle linkage broke and the transmission slipped. over a short distance like 20 miles or less, it fried the tranny when they tried to limp it home.

not sure why i shared that story, other then to mention there always used to a strong relationship between throttle position and transmission performance and i'm not sure how it's done on our trucks. if someone could explain that and post some repair manual info, it may help us both out.
 
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