Front springs for C20 with 350cu - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gmebey · 10-10-2014, 12:50 AM

After a ton of research I'm confused.

What is the MOOG spring that is equivalent OEM front spring for a 1969 C20 with a 5.7L? My old springs have a tag that shows 3935894, which equates to either a MOOG 6102 or 6104.

So what is correct?

**FirstOwner69** · 10-10-2014, 10:50 AM

Quote:

Originally Posted by gmebey

After a ton of research I'm confused.

What is the MOOG spring that is equivalent OEM front spring for a 1969 C20 with a 5.7L? My old springs have a tag that shows 3935894, which equates to either a MOOG 6102 or 6104.

So what is correct?

For whatever it's worth, Rock Auto lists 6104 as the heavy duty replacement. They do not list 6102 at all. They have one pair of 6104 left at $45. Perhaps 6102 is the standard lower rated spring. That numbering protocol would be consistent with that used with the Moog rear springs they list. In other words, 6101=L.D. rear and 6103=H.D. rear.

**Classic Heartbeat** · 10-10-2014, 12:09 PM

Small blocks got lighter duty springs than big blocks got. WES

88lsiroc · 10-10-2014, 10:22 PM

Go to napa website. They give spring height, outside and inside diameter,coil diameter and spring rate in each description. Very useful for all kinds of stuff.

gmebey · 10-10-2014, 11:08 PM

I decided to go with the 6104 since I could get them local at a great price. Wish me luck.

What is the best method to install front springs? Floor jack and spring compressors?

Mr Handy · 10-11-2014, 07:28 AM

I don't know about best method but it can be done with a pair of floor jacks and jack stands... you have to take the ball joints apart, I'm guessing with a spring compressor you don't have to knock the balls apart to get the spring out... always respect the spring under pressure whatever you do...
Might not be a bad time to replace the ball joints while your at it if they are original or high mileage.

gmebey · 10-11-2014, 08:17 AM

Working on the driver's side and hopefully will have it together today.

10-10-2014, 12:50 AM	#1
gmebey Registered User Join Date: May 2011 Location: Fort Collins, Colorado Posts: 95	Front springs for C20 with 350cu After a ton of research I'm confused. What is the MOOG spring that is equivalent OEM front spring for a 1969 C20 with a 5.7L? My old springs have a tag that shows 3935894, which equates to either a MOOG 6102 or 6104. So what is correct?

10-10-2014, 12:09 PM	#3
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	Re: Front springs for C20 with 350cu Small blocks got lighter duty springs than big blocks got. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

10-10-2014, 10:22 PM	#4
88lsiroc Registered User Join Date: Mar 2013 Location: Poconos Pa. Posts: 29	Re: Front springs for C20 with 350cu Go to napa website. They give spring height, outside and inside diameter,coil diameter and spring rate in each description. Very useful for all kinds of stuff.

10-10-2014, 11:08 PM	#5
gmebey Registered User Join Date: May 2011 Location: Fort Collins, Colorado Posts: 95	Re: Front springs for C20 with 350cu I decided to go with the 6104 since I could get them local at a great price. Wish me luck. What is the best method to install front springs? Floor jack and spring compressors?

10-11-2014, 07:28 AM	#6
Mr Handy Registered User Join Date: Feb 2013 Location: Spring Hill, Florida Posts: 465	Re: Front springs for C20 with 350cu I don't know about best method but it can be done with a pair of floor jacks and jack stands... you have to take the ball joints apart, I'm guessing with a spring compressor you don't have to knock the balls apart to get the spring out... always respect the spring under pressure whatever you do... Might not be a bad time to replace the ball joints while your at it if they are original or high mileage.

10-11-2014, 08:17 AM	#7
gmebey Registered User Join Date: May 2011 Location: Fort Collins, Colorado Posts: 95	Re: Front springs for C20 with 350cu Working on the driver's side and hopefully will have it together today. Attached Images



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