I posted this on 454SS.com and GMT400.com figured I'd post it up here too.

I know some people have asked about this, I am one of them for sure. Keep in mind that all the numbers I've come up with are for BBC trucks. I've also got a couple of other threads I'm gonna site as well. I'm not enitrely clear on 1 set of shocks and the springs that they use. But here you guys go. For the guys who dont like to read, here ya go

QA1 Precision Products GE401-10350C - QA1 Economy Pro Coil Systems - Overview - SummitRacing.com

These should drop an SS truck about 3" with a spring spacer. Probably only about 2" for a SBC truck. The spring spacer used was a 1" spacer so i'd assume if you don't use it, just add 1" to the drop. The only thing you have to do is enlarge the shock holes at the lower shock mount for the shock to fit. These are non-adjustable so for you guys who aren't going to the track and want to just drop your truck 2-3" and make it handle much better, here ya go. But for the rest of us...

Here are some alternatives I've found. Keep in mind these spring rates are for SS trucks with BBC. I have not confirmed that these springs work with these shocks, I (or someone in the US) need to call summit and confirm this. I notice in a couple of threads ( Links at the bottom) that the springs that come with the kit are not the same size top to bottom. I think you could get away with using a regular coil over spring but I need someone else to chime in on this. Ok so Part Numbers....

Shocks

Non-Adjustable
QA1 - GE501 $339 Kit w/ Springs (can't buy this shock, have to buy kit) Kit number GE501 - 10550C for 10 x 550lb springs
This kit comes with 550lb springs that will work for our trucks. SBC trucks may need a little less spring.

Single Adjustable
QA1-GS501 - $179ea - $358 a Pair I don't know the difference between the GS501 and GMP3?
Kit w/ 550lb springs -HAL-GS501-10550C $449
QA1-GMP3 - $199ea - $398 a Pair
Kit w/350lb springs - HAL-RGMP3350-3 $472
Heidts - Heidts CB-120 - $339 a Pair
Kit w/550lb springs, new thrust bearing, coil wrench - $539

Springs

Heidts - CQ-550-10-F (10 x 550lb) - $150 pair (I know these will work)

Double Adjustable.....Price doubles


I take no responsibility for someone breaking anything on their truck. I think these work, according to lots of research and reading threads, ect ect. Try this at your own risk, but if you do, definitely take some pictures.

Link to threads about coilovers.

NATC - QA1
NATC - QA1 oops.
QA1/HAL coilovers - Page 2
NATC - Has anyone solved our traction problems

 

So I guess the shock mounts and lengths are the same on the NBS trucks too, so good info for you guys too.

 

does anyone else have any info on this, Id love to do this mod to my 454ss

 

Ive been interested on coilovers for the front of my NBS for last year or so, anyone have more info or seen trucks running these?? Good info V3nomgto.

 

I know of a couple of 454SS guys running these and the big thing is you need a heavy spring. For the NBS guys I dunno how everything bolts up, but I was told it's all the same as the GMT400 trucks. Can't confirm. When I get back from this deployment I will be doing the swap on my truck and will take a crap ton of pictures for you guys. Until then I can't really tell ya anything else.

 

This might be a dumb question, but where do u buy the spring spacer.

 

Well went ahead and bought all the stuff, hope everything works

 

Sorry, haven't been very active on PT.net . I bought all of it too, will be installing when I get home in a couple weeks. The spring spacer can be bought at Jegs or summit. Here's a link.

Mr. Gasket 1285 Mr. Gasket Rubber Coil Spring Spacers