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Old 07-28-2012, 04:10 PM
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4l60e valve boost spring

My valve boost springs appear to be too worn to reuse. I'm having a hard time finding the replacement springs. Any suggestions?

Truck is a 98 Chevy k1500 5.7 350
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Old 07-28-2012, 04:20 PM
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that is not a valve boost spring. Those are release boost spring device for the 3-4 clutch pack.

Sonnax offers new replacement springs
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Old 07-28-2012, 05:55 PM
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Thank you.
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Old 07-29-2012, 09:29 PM
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Actually 3-4 shift cushion springs. Old school recommendation was to discard these for a better (more noticeable) 3-4 upshift. Nowadays rebuilders mostly leave them in. If you get your hands any one of the older 700R4 or 4L60E ATSG rebuild manuals you can find in each a clear recommendation to discard these springs.
You can take this two ways. One, toss the springs. Or two. Find a transmission shop that's been in business more than a few years and they will likely have a box of the springs somewhere in back from where they've been removing them over the years.
Personally, I put the spings back in. They are a bit of an odd design but I've never seen any "worn". At all.
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Old 07-29-2012, 11:46 PM
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get the sonax one or order them threw gm best to replace them on any rebuild i personall y have tryed leaving them out didnt notice mutch diffrence in shift firmess i like using them because they keep the clutches from applying to early also will allow for tighter clutch pack clearences thats were you can inprove the shift quility
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Old 07-30-2012, 09:50 AM
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Thanks for the info.

GypsyR- what I mean by worn is that new springs measure right around 1 1/8th" but most of the springs I took out measure closer to 1".

I will probably try and replace them.
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Old 07-31-2012, 04:17 PM
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There are places in a transmission where a thousandth of an inch is important. That isn't it. As has already been said, you can leave them out completely and find little difference. I always put them back in but that 1/8" wouldn't interest me in the least. I'd throw them back in as is and never think of them again. If you think not replacing them will be sticking with you and bothering you, buy new ones. Peace of mind is worth a lot.
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