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  #1  
Old 03-13-2015, 06:07 AM
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Trams Band Adjustment Issue

42RE Trans I adjusted the inner band to specs & backed off the adjusting screw 3 turns. Now it's slipping when I get above 20mph or so.

Should I back the adjusting screw off some or tighten it?

Note - I didn't not adjust the outer one yet (on the transmission bell housing). I wanted to make this adjustment first just in case there was an issue, which there was. Thanks in advance.

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  #2  
Old 03-13-2015, 07:25 AM
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Re: Trams Band Adjustment Issue

Did you just back off the band adjusting screw 3 turns from its previous position?
So there is a front band and a rear band. The front band is adjustable with a screw on the outside of the transmission. This band is also called the kickdown band. For the adjustment of this screw you first have to back off the adjustment screw locknut 4 to 5 turns and then torque the adjustment screw itself to 72 inch lbs. Now you will back off the adjustment screw three turns and then hold the screw while fastening the locknut.
For the rear band (also called low/reverse band), you will have to lower the pan. First you will have to back off the locknut 5 to 6 turns and then torque the adjustment screw to 72 inch lbs. Now loosen the screw four turns and hold it while fastening the lock nut.
If it is still slipping after this procedure, then most probably the respective band is worn to its limits. You maybe could stretch its live a bit by fastening the adjustment screw a turn more, but most probably it will need a rebuild soon.
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Old 03-13-2015, 09:21 AM
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Re: Trams Band Adjustment Issue

This was the rear band, inside the tranny.
I loosened the nut, tightened the adjusting screw to 72 inch pounds, then backed it off 3 times and tightened the locking nut.

So, it sounds like I should back off at least 1 more turn (will then be 4 total). Hard to belive one turn would make a big difference. Maybe I should go back off a bit more? Maybe 1.5 turns making it 4.5 total?

I've seen slightly different instructions for this tranny regarding how much to back off, from 3-5 turnrs.

Thanks
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Old 03-13-2015, 10:34 AM
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Re: Trams Band Adjustment Issue

The front band must be backed off 3 turns, while the rear band must be backed off 4 turns. I believe by backing off you adjust the clearance of the band with the drum, so when backing off more, the clearance will be bigger. You didnīt had any problems before the adjustment? Do you remember how many turns you had to give to the adjusting screw to reach the 72 inch lbs?
And you did back off the locking nut enough, so that it didnīt bottom and took the torque while putting the 72 inch lbs?
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Old 03-13-2015, 11:47 AM
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Re: Trams Band Adjustment Issue

I wish that I would have took note of how many turns it took to hit 72 ft lbs. It was more than a few for sure.

Yes, I had the locking nut backed off far enough.

I'm guesing that I didn't back off the adjusting screw enough. The instructions I had said 3 turns, others say 4-5.

Do you know the effect of having it too tight or loose? Obviously if I have it a little tight it causes the tranny to slip/jerk some while driving.

So would having it too loose possibly cause delays in shifting?

Just trying to determine the effects that the adjustment has.

Thanks again
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Old 03-13-2015, 04:24 PM
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Re: Trams Band Adjustment Issue

I have never seen the 42RE open, but from looking at the manuals, it looks to me that if you put the 72 inch lbs. on it, it will push the band to the drum. So if you then back it off 4 turns (for the rear band), you create just enough play so that the band will not touch the drum when released, but close enough to apply by the servo.
Did you have problems before making the adjustment?
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Old 03-13-2015, 04:56 PM
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Re: Trams Band Adjustment Issue

Yes I did have a problem before the fluid flush & filter. Occasionally when warm & always when cold it will not shift into 3rd gear. Let your foot off the gas for a second and it will shift.

I replaced the TPS sensor & adjusted the TV cable. But that didn't fix it. Which is why I
ended up doing the fluid/filter & rear back adjustment.

And, to your point. Even after the band adjustment it didn't auto shift into 3rd at first (cold). But worked fine after that.

So yeah, I still have that problem too any suggestions?
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Old 03-13-2015, 05:53 PM
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Re: Trams Band Adjustment Issue

Your trans may have whats called quick warm up feature.When cold it will stay in a lower gear to help warm up.

What may have happen when adjusting the bands.
Lock nut was not backed off enough and when screw is turned in it may tighten on lock nut.
A lot of guys don't have a in. lb. torque wrench in their tool box.Mostly you say inch but in one post you say foot lb.Did you use a inch lb. torque wrench.
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Old 03-13-2015, 06:10 PM
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Re: Trams Band Adjustment Issue

some tips

For a large,cheap drain pan to catch your new oil and reuse i go to home depot and buy a cement mixing pan(plastic)

I like the rubber gasket rather than cork,you can reuse the rubber one.

I do not use gasket sealer.I pass fishing line though some of the holes and tie the gasket to the pan to hold it in place and no leaks.
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Old 03-13-2015, 09:14 PM
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Re: Trams Band Adjustment Issue

When fluid temperature is below 50F, 4th gear and torque converter clutch will not engage, but 3rd gear should apply normally.
The shifting depends on several inputs, but one of them is the governor pressure. This pressure is regulated according 4 curves, depending on fluid temperature, WOT and transfer case position.
Did you check if there is any fault code set in the PCM?
Without any fault code set, you can only assure that all mechanical adjustments are ok and if they are, then there is a good change that the governor pressure solenoid or sensor is the culprit. (they are normally changed together).
But first make sure that the throttle valve cable is adjusted properly, since that is very important for proper shifting.
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Old 03-14-2015, 08:02 AM
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Re: Trams Band Adjustment Issue

jrw, Can tell us what year and model your driving.I'm trying to look up the specs(amount of turns out)

You say you have a 42RE, there is a 42rh a 47re plus others.
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Old 03-15-2015, 06:33 PM
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Re: Trams Band Adjustment Issue

I readjusted to 72 inch pounds and backed off 4 1/2 turns (was 3 before).

No luck. Same thing, after 1st gear it hesitates - like jumps/slips. It also sounded like backfired a bit (like a pop from I think the throttle body.

Weird. it never done this before. It's still don't want to shift to 3rd when cold but seems fine when warm.

In summary, all I done was.
1 replace the rear end, that seems fine now.
2 new Trans filter & fluid.
3 adjusted the rear band, 72 inch pounds. Backed off 3 times, then 4 1/2 time.

Same problem when backed off 3 or 4 1/2 times. PS I had the lock nut back off enough each time too.

Any ideas?
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