T1 spring Part number/ Casting number questions

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Mar 6, 2009 | 10:17 PM

wallyman424

Thread Starter

Melting Slicks

Joined: Jul 2005

Posts: 2,381

Likes: 1

From: Charleston SC

T1 spring Part number/ Casting number questions

Hey guys, quick question:

I'm selling my old T1 springs, and in raised lettering on the springs are the numbers: 22188479 and 22188480

The GM part numbers for the T1 springs are 12480063 and 12480064

I found this information from the forums:

Quote:

"Front Springs
Part Number Casting Num Code Rate Years Suspension Useage
22178728 440# 97-02 FE1 w/o F45 All bodies with soft ride susp FE1,(EXC Chasis Realtime Damping F45)
22178729 22171750 AY 525# 98-00 FE3/Z51, FE4/Z06 All bodies with sport suspension Z51/FE3 and Z06 suspension FE4
22178748 457# 99-02 FE1 with F45 Y07-67 Soft ride suspension FE1, Chasis realtime damping F45
12480063 22188479A 582# 97-02 T1 New New style T1 front spring
22188479 582# 97-02 T1 Old Old style T1 front spring

Rear Springs
Part Number Casting Num Code Rate Years Suspension Useage
22179019 577# 98-03 FE1 with MM6 All bodies with 6 speed MM6 and Soft ride suspension FE1
22179020 22171757 RJF 634# 98-00 FE3/Z51 with MM6 All bodies with 6 speed MM6 and Sport suspension Z51/FE3
22146323 588# 98-03 FE1 with M30 All bodies with 4-spd auto trans M30 and Soft ride suspension FE1
22146646 645# 98-03 FE3/F51 with M30 All bodies with 4-spd auto trans M30 and Sport suspension Z51/FE3
22188038 22188078 RJH 714# 01-03 FE4/Z06 with M12 Z06 Hardtop with 6 speed M12 and FE4 Suspension
12480064 22188480 794# 97-02 T1 T1 Rear Spring"

What I/the buyer want to know is why GM has different part numbers/ casting numbers. And under scrutiny by an SCCA official, will they know that these are legal T1 springs?

Thanks for the help

Mar 7, 2009 | 12:25 AM

spazegun2213

Burning Brakes

Joined: Dec 2007

Posts: 1,085

Likes: 0

From: San Diego

might want to check google. Mine were weird as well. I guess there are "older" t1 springs and newer ones. However, anyone with SCCA should know.

Mar 8, 2009 | 09:06 PM

lashways

Intermediate

Joined: May 2007

Posts: 31

Likes: 0

Hi want t1 springs for my 2003 z06, please send price and do you have the spring rates for these springs vs the newer t1 springs thanks

Nov 25, 2009 | 01:51 AM

fatbillybob

Melting Slicks

Joined: Dec 2004

Posts: 3,382

Likes: 250

FWIW The raised casting numbers embeded 22188479 front spring and 22188480 rear spring seen in the T1 springs have been confirmed by another forum member who received T1 springs from GM.

Nov 25, 2009 | 11:21 AM

Rob P

Burning Brakes

Joined: Aug 2004

Posts: 903

Likes: 4

From: Oakville

There is a new and old spring
from what I remember, the spring rates are the same.

The new ones allow you to lower the car further down as well.

Nov 25, 2009 | 09:22 PM

fatbillybob

Melting Slicks

Joined: Dec 2004

Posts: 3,382

Likes: 250

Quote:

Originally Posted by Rob P

There is a new and old spring
from what I remember, the spring rates are the same.

The new ones allow you to lower the car further down as well.

I just made my last post to complete the resource. I have old springs and the new springs appear to use the same casting numbers. I have not heard of old springs vs new T1 springs. There was a rear T1 swaybar change where the old one was not adjustable and the new one has 3 adjustment holes. The front T1 bar did not change to my knowledge.

Nov 27, 2009 | 08:22 AM

CP Thunder

Drifting

Joined: Oct 2008

Posts: 1,297

Likes: 6

From: Omaha Nebraska

I asked Jeff Kopp at Superior measure the rear bar end to end for length, (same) and measure outside link mounting holes (same). The 'new' holes are inside the old bar mounting holes, therefore, the adjustablity is firmer only. Would have been nice to have a softer option too.

Nov 27, 2009 | 02:43 PM

gkmccready

Safety Car

Joined: May 2005

Posts: 3,520

Likes: 3

From: Redwood City CA

Quote:

Originally Posted by CP Thunder

Real question is did the wall thickness change to actually make the `old' holes softer than before? Only a hacksaw and some cash will know for sure. :-)

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Nov 27, 2009 | 04:19 PM

CP Thunder

Drifting

Joined: Oct 2008

Posts: 1,297

Likes: 6

From: Omaha Nebraska

Good point. I am working under the assumption the bars are of the same diameter and thickness........will get with my resident expert to confirm...........