pushrod-v8

Anyone know the size of the rear bolts used to lower the car?

I am looking at ordering a set of 11" but I need to know the size first.

Thanks!

FASTAZU

Stock

GKK

The rear lowering bolts from the Corvette suppliers are 10" in length which I installed and with a full tank of fuel, the rear measurement is 26 3/4" from the ground to the top of the wheel well. The lowered front measures 26".

I wanted the rear of my 91 Vette lower so, after searching here on the forum, a member posted that he found these 11" bolts from Fastenal. I ordered the 11" bolts and matching nylon lock nuts from Fastenal.

The bolts are Metric 8.8 which is equivalent to a Grade 5 bolt strength, which is plenty strong for this application.

Here are the sizes and specs:

M14-2.0 x 280mm (11" length) 8.8 Plain Cap Screw. (SKU) 38997 $7.79 each.

Or, if you wanted a longer bolt...

M14-2.0 x 300mm (11.8" length) 8.8 Plain Cap Screw. (SKU) 38998 $21.86 each.

Also, here are the Nylon Lock Nut specs and part number:

M14 x 2 Zinc Plated Class 10 Steel Nylon Insert Lock Nut. (SKU) 11508309 $0.45 each.




.

Rexracer77

Thanks for posting this, its something I have been meaning to research!

DanZ51

Or if you don't mind using SAE Standard thread (Fastenal might actually stock these).

(2) 9/16-12x10" P/N 15283 $4.39 each
(2) 9/16-12 Nylock Nut P/N 1137189 $1.75 each

These are grade 8 fasteners, and are slightly bigger than the 14mm (1/2") factory hardware.

GKK

VB&P, (Vette Brakes & Products inc.) offers a Grade 8, 12" long bolt kit with new bushings and lock nuts for $106.99 if money is not a concern.

http://www.vbandp.com/auto-parts.htm...ategory_id=114

c4cruiser

Also note that aftermarket bolts won't have the hole drilled thru the bolt body. The OEM bolt uses a castle nut and cotter pin to hold it in place.

Use a nyloc nut for these lowering bolts. Once you have the ride height set using a standard nut, mark the threads above the nut with paint. Then remove the standard nut and replace with the nyloc nut and bring the base of the nut even with the paint mark.

H Watkins

Thanks for the reminder, C4 cruiser. I purchased the bolt kit from one of our after-market suppliers well over 6 years ago. I finally acquired 18" wheels for the rear and I now want to lower the rear end about 1/2 - 3/4". I learned about your height adjustment pre-check from this forum back then but forgot about it.

GKK

The lowering bolt kits from all the corvette suppliers and also, the links I listed, include the Nylon Lock Nuts.







.