Slightly different 1-2 shift issue

Slightly different 1-2 shift issue

Postby Jamie [OP] » January 12th 2016, 1:47pm

'03 Safari, 150K miles. When the tranny shifts from 1-2, it is like a 2 step shift. Seems like it shifts into 2nd, then a second or two later finishes. It's not super 'hard' when it finishes, but you feel it. Any ideas?
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Re: Slightly different 1-2 shift issue

Postby Mmusicman » January 12th 2016, 2:02pm

Possible cracked internal race/sprague on a clutch pack?
Or maybe just a sticking valve?

Try a can of "Trans Tune" for sticking parts... it's worked for me in the past. (but it won't fix broken hard parts)
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Re: Slightly different 1-2 shift issue

Postby paulo57509 » January 13th 2016, 3:42am

Mine did this since it was new. It doesn't do this since I rebuilt the trans in spring of 2014.

viewtopic.php?f=70&t=89633&p=867137#p867137
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Re: Slightly different 1-2 shift issue

Postby chevymaher » January 13th 2016, 1:58pm

Bore in the valve body is known to wear and the piston cocks in the bore. So it is slow in engaging.

Need Picard to set it straight.
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Re: Slightly different 1-2 shift issue

Postby Jamie [OP] » January 19th 2016, 7:26pm

Would a shift kit replace that part, or is it 'deeper'?
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Re: Slightly different 1-2 shift issue

Postby chevymaher » January 19th 2016, 7:34pm

Jamie wrote:Would a shift kit replace that part, or is it 'deeper'?

Shift kit has a heavier spring in it. That is a band aid fix but yes it works.

Proper way to fix it is take the valve body out and hone the bore replace the piston. Replace the valve body.

But for ordinary you and me guys. Shift kit solves it for a long long time.
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Re: Slightly different 1-2 shift issue

Postby Jamie [OP] » January 22nd 2016, 8:05pm

I guess it's time to do a shift kit, B&M the best bet? I'll start viewing youtube videos, any favorites?
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Re: Slightly different 1-2 shift issue

Postby chevymaher » January 22nd 2016, 8:45pm

They are all priced about the same. I would trust BM the most myself.
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Re: Slightly different 1-2 shift issue

Postby kennysmoke » January 22nd 2016, 10:11pm

chevymaher wrote:Bore in the valve body is known to wear and the piston cocks in the bore. So it is slow in engaging.

Need Picard to set it straight.
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"Proper way to fix it is take the valve body out and hone the bore replace the piston. Replace the valve body."


My '97 AWD I used to own had this problem and as Chevy said this was the REAL fix... I had just bought the van at the time and it was on extended warranty... got it fixed for free never had another shifting issue in the 8 years and over 100,000 miles I put on it.
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Re: Slightly different 1-2 shift issue

Postby AstroWill » January 22nd 2016, 11:43pm

chevymaher wrote:They are all priced about the same. I would trust BM the most myself.


Nothing like a good BM.

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Re: Slightly different 1-2 shift issue

Postby Jamie [OP] » January 23rd 2016, 2:55pm

From what I can see watching some videos, (FWIW, I can run a cylinder boring machine, cut valve seats, degree a camshaft(s), rebuild a manual tranny, set up a rear axle gear, etc., but never touched an automatic transmission), installing a shift kit looks like I have to remove the valve body, honing the bore and replacing the piston would seem to be 'prudent' at that point, right?
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Re: Slightly different 1-2 shift issue

Postby kennysmoke » January 23rd 2016, 3:01pm

I have no idea about transmissions either... from what I was told when they fixed mine was they removed the valves, bored bigger holes, insert a new sleeve and new valves. All I know was once I got it back it shifted flawlessly for 8 years and over 100,000 miles I put on it.
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Re: Slightly different 1-2 shift issue

Postby paulo57509 » January 23rd 2016, 7:38pm

paulo57509 wrote:Mine did this since it was new. It doesn't do this since I rebuilt the trans in spring of 2014.

viewtopic.php?f=70&t=89633&p=867137#p867137


I went back and looked at the parts that were provided with the rebuild kit I purchased from Pro-Built automatics. The kit was really a mix of parts proven to fix known 4L60E issues. The rebuild kit contained both Transgo 4L60E-HD2 and SK-4L60E kits.

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Here's a photo of the SK kit box label. Perhaps the SK kit had something to do with improving the 1-2 shift (ignore the blue box).
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Re: Slightly different 1-2 shift issue

Postby Jamie [OP] » January 23rd 2016, 11:44pm

I just watched a video of a shift kit install using the SK kit, doesn't seem all that hard. Once the valve body is unbolted, it's on the bench, switch out the parts, bolt it back in. One plus doing it in the van, gravity works with you as far as the check balls are concerned. It does address the 1-2 shift with a slightly over size piston and heavier spring. As I think about it, another video mentioned the two gaskets on either side of the spacer plate, they were labeled which one went against the case and which one went against the valve body, this last video didn't even mention gaskets, hmmm. More data needed.
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Re: Slightly different 1-2 shift issue

Postby Mmusicman » January 23rd 2016, 11:52pm

Did the shift used to be ok?
Like I've suggested numerous times... try a can of "Trans Tune". It has fixed shifting issues I've had in the past. A lot less work... if it works! :shock:

PS: I have "shift kits" in ALL my transmissions! :D
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