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-   -   Trans Band Adjustment Problems (https://www.nagca.com/forum/showthread.php?t=71840)

ZJTim 05-09-2019 03:41 PM

Trans Band Adjustment Problems
 
Hi all, I have a 97 GC with the 42re. It shifted perfectly when I purchased it a few months ago, but it does have 173k miles. I changed the fluid and figured it could use a band adjustment while I was at it. I saw a video on youtube recommending 3 backout turns after torquing to 72 in/lbs. The trans started shifting funny after about 1,000 miles. I decided to check the spec in the FSM and it states 4 backout turns. I readjusted today and now it barely wants to grab the gear and clunks. What should I try readjusting to next? Is the trans toast? Thanks all!

ZJTim 05-10-2019 09:08 AM

I think this is what I needed. It list specs for individual model years. Wouldn't have thought it would change that frequently. I guess thats why there are so many numbers floating around out there.

I cant post the link but you can google "atb1151 atra"
Should be the first result, a pdf doc.

ZJTim 05-10-2019 02:44 PM

Well unfortunately it still slips at 2 turns out. I had to go to 1.5. It is not slipping as much but has a harder shift and occasionally waits a few seconds to shift into reverse or drive. I am guessing I toasted the clutches and will need a rebuild. Also, a side note, definitely use a torque wrench to get your 72 in/lbs. My mental meter was off by at least 3/4 turn.

ZJTim 05-10-2019 02:45 PM

Heres that link now that I have 5 posts


https://atracom.blob.core.windows.ne...an/atb1151.pdf

ZJTim 05-11-2019 11:00 AM

1.5 resulted in the trans locking under no load. I tired 1.75 next and still have slipping and slight lock. Looks like the trans is shot. Warning to all, make sure you get your band adjustment right!

Briian-Emmons 05-11-2019 03:07 PM

your fault may have been the shift solenoid failing

ZJTim 05-12-2019 06:26 AM

Briian, thanks for the reply. Is that the same as the governor solenoid? So i probably should have mentioned this earlier. When I put the magnet back in the pan I put it in the wrong spot. When I was tightening the pan down it was pressed into the governor solenoid and broke the magnet. A quick visual inspection showed no damage to anything besides the magnet. Is it possible this broke the solenoid? It appears there is a shroud around the solenoid which is why I thought it likely didn't sustain damage.

Briian-Emmons 05-12-2019 08:07 AM

they have a governor and shift solenoids and both cause shift faults. could not tell you which one is which but also the 42re is oil fussy and will only work with AT4 or its equivalent.
all it can take is slight damage to the wiring to make the solenoid not work correctly, and also their are two adjusters for the bands, the rear under the filter and the front hidden by the front prop and needs a 4 side or 8 point socket to adjust


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