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GM spanner wrench for C8 Corvette

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Old Jul 27, 2020 | 03:38 PM
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Default GM spanner wrench for C8 Corvette

I'm looking to lower the car and wondering what any of you guys out there have used to do so. I'm finding a lot of people saying that it's a special size that no one really seems to have but I can't find any part number for a GM specific wrench to adjust the stock height.
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Old Jul 30, 2020 | 09:43 AM
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This says a generic adjustable wrench will work.

https://www.corvetteforum.com/forums...g-seats-2.html
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Old Jul 31, 2020 | 06:14 PM
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Originally Posted by HorsePowerObsessed
I'm looking to lower the car and wondering what any of you guys out there have used to do so. I'm finding a lot of people saying that it's a special size that no one really seems to have but I can't find any part number for a GM specific wrench to adjust the stock height.
I saved this from another post a while ago as I would be using the process to lower mine too.

This was cut and pasted from that post and it's from a C8 engineer:

HERE YOU GO , Straight from C8 Engineer !

Here is the general guidance:
Our spring seat wants a spanner wrench capable to 4 7/8th in (124mm)
Our lock nut wants a spanner wrench capable to 3 1/16th in (79mm)
Our anti-rotation holes want a pin wrench capable to 2 3/32nds in (53mm)


For the spring seat I suggest

McMaster-Carr hook spanner #6975A25
(https://www.mcmaster.com/6975A25)

AMPCO Adjustable Hook spanner #4RPC1 / WP-6-ST (https://www.grainger.com/product/AMP...r-Wrench-4RPC1)

Adjustable is a bit more challenging as the hook can move, but this one tool can technically do both the nut and the seat, no where as easy as fixed tools though

For the lock nut I suggest
McMaster-Carr hook spanner #6975A21
(https://www.mcmaster.com/6975A21)

For the pin wrench I suggest
Westward Fixed Pin Spanner wrench 5RDZ4
(https://www.grainger.com/product/WES...rchQuery=5RDZ4)


Good luck and let us know how this works out. I'll watch it on your next YouTube post

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Old Jul 31, 2020 | 10:20 PM
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Originally Posted by pksjc
I saved this from another post a while ago as I would be using the process to lower mine too.

This was cut and pasted from that post and it's from a C8 engineer:

HERE YOU GO , Straight from C8 Engineer !

Here is the general guidance:
Our spring seat wants a spanner wrench capable to 4 7/8th in (124mm)
Our lock nut wants a spanner wrench capable to 3 1/16th in (79mm)
Our anti-rotation holes want a pin wrench capable to 2 3/32nds in (53mm)


For the spring seat I suggest

McMaster-Carr hook spanner #6975A25
(https://www.mcmaster.com/6975A25)

AMPCO Adjustable Hook spanner #4RPC1 / WP-6-ST (https://www.grainger.com/product/AMP...r-Wrench-4RPC1)

Adjustable is a bit more challenging as the hook can move, but this one tool can technically do both the nut and the seat, no where as easy as fixed tools though

For the lock nut I suggest
McMaster-Carr hook spanner #6975A21
(https://www.mcmaster.com/6975A21)

For the pin wrench I suggest
Westward Fixed Pin Spanner wrench 5RDZ4
(https://www.grainger.com/product/WES...rchQuery=5RDZ4)


Good luck and let us know how this works out. I'll watch it on your next YouTube post
That's awesome! Thanks for the info. I'll definitely make a video on this. Lots of info that is untapped right now.
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Old Aug 1, 2020 | 10:02 AM
  #5  
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Default Another option

https://aadperformance.com/collectio...ner-wrench-set

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Old Aug 1, 2020 | 11:08 AM
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Excellent! Thank you!
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Old Aug 29, 2020 | 07:34 PM
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here you go !

https://www.agmotorsports.net/produc...ner-wrench-set
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Old Sep 2, 2020 | 11:59 PM
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Originally Posted by c7steve
Ordered mine from AG Motorsports and the set arrived today.

Now if I just had the car
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