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73-87 Chevy _ GMC Trucks => Brakes, Frame, Steering & Suspension => The Lows (Lowering/Drops) => Topic started by: chevymotocross on July 14, 2010, 01:03:40 pm

Title: Are longer shim bolts required with the use of drop springs?
Post by: chevymotocross on July 14, 2010, 01:03:40 pm

I'm in the process of lowering the front of my 87 silverado along with new suspension parts (tie rods, balljoints, etc).

I noticed the stock setup already has lots of shims. With the addition of 2'' drop springs, I will need even more shims. I don't think the stock upper control arm studs will be long enough to compensate.

I read somewhere that the stock studs can be knocked out and replaced with longer 1/2x4 Grade 8 bolts.

Is this needed for a 2'' spring and 2.5'' spindle drop?

Moog also sells an offset UCA shaft but I would rather go the bolt route so I don't have to dissassemble the UCA.

Title: Re: Are longer shim bolts required with the use of drop springs?
Post by: Captkaos on July 14, 2010, 01:11:49 pm

more shims, yes.  longer studs no.

Title: Re: Are longer shim bolts required with the use of drop springs?
Post by: chevymotocross on July 14, 2010, 01:20:23 pm

I guess I'll give it a try. Just seems there isn't much thread left for extra shims. If alignment guy tells me so, I'll have to add longer studs at a later time.

Title: Re: Are longer shim bolts required with the use of drop springs?
Post by: stavendirtbike on July 15, 2010, 04:01:04 pm

I replaced them all today with longer grade 8 bolts. Atleast now I know 100% the alignment shop can have no excuse for not getting the camber correct. Plenty of room for shimming.

Title: Re: Are longer shim bolts required with the use of drop springs?
Post by: txswb87 on July 18, 2010, 09:02:41 pm

Drop spindles dont change your front geometry,everything should work fine mine did.