Rear Shock Extension

sixty8 · 06-09-2012, 02:34 PM

I have a 68 Camaro with split mono's, Caltrac's and AFCO 3870R DA shocks. These shocks have 7" of travel. When sitting at ride height, I have 3" out for compression and 4" for extension using the lower mount on the Caltrac plate and the stock upper mount. I think that I may be topping out the shock sometimes when I launch and unloading the tire. These shocks have an adjuster on the top, so a shock extension is not an option.

Is 4" enough extension travel? Any suggestions on ways to get more extension by modifying the mounts or any other solutions?

Mike Roth · 06-09-2012, 07:00 PM

Quote:

Originally Posted by sixty8

I have a 68 Camaro with split mono's, Caltrac's and AFCO 3870R DA shocks. These shocks have 7" of travel. When sitting at ride height, I have 3" out for compression and 4" for extension using the lower mount on the Caltrac plate and the stock upper mount. I think that I may be topping out the shock sometimes when I launch and unloading the tire. These shocks have an adjuster on the top, so a shock extension is not an option.

Is 4" enough extension travel? Any suggestions on ways to get more extension by modifying the mounts or any other solutions?

More than enough.

cad · 06-09-2012, 11:34 PM

..............

340Cuda · 06-10-2012, 10:18 AM

I would call Calvert. If you are getting that much rise he may want to change your spring, he did on mine. He just sent me another set of springs, assuming I would send the first ones back which of course I did. However this was when everything was all brand new.
Bill

GTX JOHN · 06-12-2012, 04:42 AM

Our Calvert springs and bar when adjusted properly cut rise and shock
extension by at least half over ss stuff on our mopars. We also reduce
pinion angle by 1/2 (Do not need it when travel is reduced)which seen to lower lift as well.

06-09-2012, 02:34 PM	#1
sixty8 Junior Member Join Date: Sep 2007 Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Rear Shock Extension I have a 68 Camaro with split mono's, Caltrac's and AFCO 3870R DA shocks. These shocks have 7" of travel. When sitting at ride height, I have 3" out for compression and 4" for extension using the lower mount on the Caltrac plate and the stock upper mount. I think that I may be topping out the shock sometimes when I launch and unloading the tire. These shocks have an adjuster on the top, so a shock extension is not an option. Is 4" enough extension travel? Any suggestions on ways to get more extension by modifying the mounts or any other solutions?

06-09-2012, 11:34 PM	#3
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 702 Likes: 202 Liked 91 Times in 51 Posts	Re: Rear Shock Extension .............. Last edited by cad; 03-02-2023 at 06:21 PM.

06-10-2012, 10:18 AM	#4
340Cuda VIP Member Join Date: Apr 2003 Location: Tulsa, Oklahoma Posts: 1,671 Likes: 3,859 Liked 801 Times in 338 Posts	Re: Rear Shock Extension I would call Calvert. If you are getting that much rise he may want to change your spring, he did on mine. He just sent me another set of springs, assuming I would send the first ones back which of course I did. However this was when everything was all brand new. Bill

06-12-2012, 04:42 AM	#5
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,733 Likes: 2,799 Liked 2,486 Times in 697 Posts	Re: Rear Shock Extension Our Calvert springs and bar when adjusted properly cut rise and shock extension by at least half over ss stuff on our mopars. We also reduce pinion angle by 1/2 (Do not need it when travel is reduced)which seen to lower lift as well.