Broken Valve Body Springs - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kna4977 · 11-27-2025, 06:36 PM

Anyone know where I can source a detent valve outer spring for a TH350 valve body? Or is there a spring from something else I might be able to substitute? I took my valve body apart to install a shift improvement kit and found two broken springs. The one on the 2-3 shift valve is broken in two. Replacements for those come in various shift kits. However the detent spring on mine is broken in four pieces and I can’t find a source. I see a used one on eBay for $25, but that seems silly and want to see if there might be another source or kit that may have what I need that I may not know about.

**Getter-Done** · 11-27-2025, 06:57 PM

Summit does have this kit with springs.

It's $70.23 they may have a black Friday code.

Link: https://www.summitracing.com/search?...9TRG-350-1%262

Just an option and they are new and next day shipping.

Grounded63 · 11-27-2025, 08:26 PM

The detent roller ?

https://globaltransmissionparts.com/...-roller-th350/

kna4977 · 11-27-2025, 09:31 PM

Quote:

Originally Posted by Getter-Done

Summit does have this kit with springs.

It's $70.23 they may have a black Friday code.

Link: https://www.summitracing.com/search?...9TRG-350-1%262

Just an option and they are new and next day shipping.

It does have springs but not the one spring I need. Not the detent roller. It's the outer detent spring that goes on the kick-down valve. It's #28 in this diagram (Not 21 that's circled).

Grounded63 · 11-28-2025, 03:34 PM

You might want to try a local, non-chain, transmission rebuilder. Kinda doubt you will be able to find that on the shelf somewhere.

cbeerman · 11-28-2025, 04:34 PM

Looks like they call it a Detent Valve Outer Spring and GM didn't sell it separately it was part of the valve body kit

kna4977 · 11-28-2025, 09:39 PM

Quote:

Originally Posted by cbeerman

Looks like they call it a Detent Valve Outer Spring and GM didn't sell it separately it was part of the valve body kit

Is there anything that could be substituted? What would happen if a stiffer spring was used would it make a big difference? It's just for the kick down/passing gear right?

Where could I find specs for that spring?

cbeerman · 11-29-2025, 03:38 AM

Maybe check Craigslist for a local backyard trans rebuilder. They might have odd spare parts or an old valve body laying around.

kaycee · 11-29-2025, 11:58 AM

Try a local trans shop or salvage yard

11-27-2025, 06:36 PM	#1
kna4977 Senior Member Join Date: Jul 2006 Location: DFW Posts: 571	Broken Valve Body Springs Anyone know where I can source a detent valve outer spring for a TH350 valve body? Or is there a spring from something else I might be able to substitute? I took my valve body apart to install a shift improvement kit and found two broken springs. The one on the 2-3 shift valve is broken in two. Replacements for those come in various shift kits. However the detent spring on mine is broken in four pieces and I can’t find a source. I see a used one on eBay for $25, but that seems silly and want to see if there might be another source or kit that may have what I need that I may not know about.

11-27-2025, 08:26 PM	#3
Grounded63 Registered User Join Date: Dec 2016 Location: Canon City, Colorado Posts: 269	Re: Broken Valve Body Springs The detent roller ? https://globaltransmissionparts.com/...-roller-th350/

11-28-2025, 03:34 PM	#5
Grounded63 Registered User Join Date: Dec 2016 Location: Canon City, Colorado Posts: 269	Re: Broken Valve Body Springs You might want to try a local, non-chain, transmission rebuilder. Kinda doubt you will be able to find that on the shelf somewhere.

11-28-2025, 04:34 PM	#6
cbeerman Registered User Join Date: Jan 2016 Location: NJ Posts: 457	Re: Broken Valve Body Springs Looks like they call it a Detent Valve Outer Spring and GM didn't sell it separately it was part of the valve body kit Attached Images Last edited by cbeerman; 11-28-2025 at 06:09 PM.

11-29-2025, 03:38 AM	#8
cbeerman Registered User Join Date: Jan 2016 Location: NJ Posts: 457	Re: Broken Valve Body Springs Maybe check Craigslist for a local backyard trans rebuilder. They might have odd spare parts or an old valve body laying around.

11-27-2025, 06:57 PM	#2
Getter-Done Senior Member Join Date: Dec 2009 Location: TN. Posts: 9,874	Re: Broken Valve Body Springs Summit does have this kit with springs. It's $70.23 they may have a black Friday code. Link: https://www.summitracing.com/search?...9TRG-350-1%262 Just an option and they are new and next day shipping. __________________ ________________________________________________________________________________________ ____________________________________________ The early bird gets the worm, But the second mouse gets the cheese 85 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build

11-29-2025, 11:58 AM	#9
kaycee Registered User Join Date: Jan 2000 Location: Wyoming USA Posts: 2,506	Re: Broken Valve Body Springs Try a local trans shop or salvage yard __________________ 2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327/4L60



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