1972 350 without air coil springs

[Perry O.]

I have a 1972 350 base without air and I'm trying to replace the coil springs .the springs im receiving bear no resemblance to the springs i removed.gm tag pn is 3931823 thank u

[Joe L.]

Re: 1972 350 without air coil springs

I have a 1972 350 base without air and I'm trying to replace the coil springs .the springs im receiving bear no resemblance to the springs i removed.gm tag pn is 3931823 thank u

Perry------


VERY common problem. The replacement springs, which are incorrectly sometimes referred to as "reproductions", MIGHT perform OK but they are usually not configured like the originals.

Your chances of finding NOS GM #3931823 springs is extremely remote. However, the chance might be slightly greater if you were to look for the GM replacement for 3931823 which was GM #331316. It was discontinued a long time ago but there might still be a few around.

[Ralph S.]

Re: 1972 350 without air coil springs

Joe, I have 2 springs with the green tag # 14003398 I know they came from a 1972 small block conv. no A/C what application shows up for these.

[Joe L.]

Re: 1972 350 without air coil springs

Joe, I have 2 springs with the green tag # 14003398 I know they came from a 1972 small block conv. no A/C what application shows up for these.

Ralph-----


The original application was 1980 Corvette with less than 760 GAWRF.

[Ralph S.]

Re: 1972 350 without air coil springs

Joe, I found the other 2 springs I had 3931823 HS on the green tag they came off of a 6,000 mile 72 conv. but they are rusty does that effect anything ?

[Joe L.]

Re: 1972 350 without air coil springs

Joe, I found the other 2 springs I had 3931823 HS on the green tag they came off of a 6,000 mile 72 conv. but they are rusty does that effect anything ?

Ralph-----

If it's just surface rust, no problem. If it's pitting type rust, big problem.

[Ralph S.]

Re: 1972 350 without air coil springs

I guess I will junk those 1980 springs I cannot see anybody that would ever want them.

[Joe L.]

Re: 1972 350 without air coil springs

I guess I will junk those 1980 springs I cannot see anybody that would ever want them.

Ralph------


If they are in good shape, somebody with a 1980 might want them. 1980's sometimes need springs, too.

[Barry U.]

Re: 1972 350 without air coil springs

Perry

I also have a 72 SB without Air and have found replacement springs never give you that factory ride height spec.
I cleaned up my original ones and reinstalled them

[Michael B.]

Re: 1972 350 without air coil springs

Perry,

I just went through the same thing with my 72 350 base (with air). I ended up going with replacement springs offered by Zip that claim to be an exact replication of the 3931823 spring. Although it looks similar with 10 coils and a 15 1/2 inch height, it has a spring rate of 430 pounds. That's close to twice the spring rate of the original 3931823 but also the lowest rating I could find in a replacement spring. The body has not been placed back on my chassis yet so I can't comment on the ride height. If it's too high I guess my only option will be to start cutting bits off the spring until satisfied. It's frustrating that even Eaton doesn't make a replacement spring that's even close to the original ratings.

Good luck, and I'd appreciate hearing what product you chose and how the ride height turned out.

Mike B.