Transmission front pump signs of failure?

DynoPax · **Posted:** Sat Apr 07, 2012 11:24 am

Well, what do you know, tranny shuddering is back with a vengeance! This time, it is apparent almost from the get-go, through all shift points and even when letting go of the throttle...

I highly suspect the front pump failing, something I skipped with the Transgo when I did the TC and shift kit a couple years back. Now it comes back to bite me in the lower part of my back! I now recall warp2diesel's words of wisdom about not leaving this to luck... My bad :roll:

Question, then: Am I pointing in the right direction?

DynoPax · **Posted:** Tue Apr 10, 2012 8:38 am

Reading through some tranny shudder issue posts on the Net, it may indicate another problem, this engine-related... I poured a can of Seafoam last week, as I usually do once a year, and this 1 day prior to the shudder starting. Shudder is constant and mostly felt in 2-3-4 gears, especially when load is applied (throttle or terrain elevation). What mesmerizes me is feeling this shudder even when decelarating in the same gears. Any opinion is welcome, as I am stumped!

I am going to replace oil & filters in the tranny and transfer case tonight. Hopefully this will do the trick, though I am kinda skeptic in the light of the symptoms. More to come...

jeepdan · **Posted:** Tue Apr 10, 2012 8:49 am

DynoPax wrote:

Reading through some tranny shudder issue posts on the Net, it may indicate another problem, this engine-related... I poured a can of Seafoam last week, as I usually do once a year, and this 1 day prior to the shudder starting. Shudder is constant and mostly felt in 2-3-4 gears, especially when load is applied (throttle or terrain elevation). What mesmerizes me is feeling this shudder even when decelarating in the same gears. Any opinion is welcome, as I am stumped!

I am going to replace oil & filters in the tranny and transfer case tonight. Hopefully this will do the trick, though I am kinda skeptic in the light of the symptoms. More to come...

Check the easy things first.
Check your U-joints.
Also check the rear axle upper and lower control arm joints for wear which might cause pinion angle to change and be off.

boilermaker2 · **Posted:** Tue Apr 10, 2012 10:31 am

May be talking about a couple of different "shudders." The one I've dealt w/ for over 150k miles is the delayed engagement one Warp discussed Flman had a simple quasi fix I have not done yet that I have been told helps. I've bought the parts but have not yet applied....
Another is the TC that bottoms out that you already fixed.
I've never heard shuddering in 2-3-4th gear. Before I swapped parts I swap fluid first and use DCX spec'd stuff only...adding additives as a last resort before part swapping.
B2

DynoPax · **Posted:** Tue Apr 10, 2012 12:16 pm

jeepdan wrote:

DynoPax wrote:

Reading through some tranny shudder issue posts on the Net, it may indicate another problem, this engine-related... I poured a can of Seafoam last week, as I usually do once a year, and this 1 day prior to the shudder starting. Shudder is constant and mostly felt in 2-3-4 gears, especially when load is applied (throttle or terrain elevation). What mesmerizes me is feeling this shudder even when decelarating in the same gears. Any opinion is welcome, as I am stumped!

I am going to replace oil & filters in the tranny and transfer case tonight. Hopefully this will do the trick, though I am kinda skeptic in the light of the symptoms. More to come...

Check the easy things first.
Check your U-joints.
Also check the rear axle upper and lower control arm joints for wear which might cause pinion angle to change and be off.

Yes, u-joints will be inspected as well! I am going to be pro-active and order a new set today, not that expensive and rather easy to replace. I did those last fall but never got satisfied, because of a low rumble that kept on going...

DynoPax · **Posted:** Wed Apr 11, 2012 9:20 am

Rear u-joint on the driveshaft was shot, 1 of the cups had bearings pulverised into powder. Replaced with greasable one and no more vibration from the drivetrain this AM. I had a tough time trying to seat the cups properly, as clips would not fit in, and trying to squeeze further more would seize the joint. Anyway, thx for the tips!

boilermaker2 · **Posted:** Thu Apr 12, 2012 9:44 am

Great job and follow-up post. I'll keep this in mind when mine eventually fails (first set went at about 38k).
B2

Transmission front pump signs of failure?

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