Pinion angle on 340 Duster

Coleydog · 05-04-2024, 08:03 PM

So I got the CalTracs on (split mono standard height) what are you guys-gals running for pinion angle? Do these springs wrap up like the S/S springs? I’ve set it up at 3 degrees down from center line of engine trans. I’d rather get it close without adding wedges later on. No I don’t want to ask the Cal people.

GTX JOHN · 05-05-2024, 12:51 AM

1 to 1 1/2 down as I recall.

They do not need the larger pinion angle down
that the old Superstock and Launchers required.

John Calvert is a great guy and I never hesitate to ask
him anything suspension related!

Coleydog · 05-05-2024, 10:13 AM

Thanks, I’ll weld it up today

Tom Goldman · 05-05-2024, 12:01 PM

The older installation instructions used to recommend 3-4 degrees angle ,but I see the new instructions no longer mention pinion angle . I've always installed them at 4*.
I'd call Calvert for a recommendation.

Coleydog · 05-05-2024, 05:25 PM

I think I’ll wait till the block and trans case-main shaft are in car to see where their centerline lays. I can get 2 birds on that making up the SS headers at same time.
Like John said 1 to 2-1/2 down from that. Awhile back I saw a vid where a guy had a go-pro camera under car to watch the launch, that rear did a lot of wrap up and movement. So I don’t have experience with Cals, thats the reason I’m asking real world A-Body racers their setups.
Appreciate all comments from our expert racers.

05-04-2024, 08:03 PM	#1
Coleydog Senior Member Join Date: Jul 2014 Posts: 567 Likes: 35 Liked 48 Times in 33 Posts	Pinion angle on 340 Duster So I got the CalTracs on (split mono standard height) what are you guys-gals running for pinion angle? Do these springs wrap up like the S/S springs? I’ve set it up at 3 degrees down from center line of engine trans. I’d rather get it close without adding wedges later on. No I don’t want to ask the Cal people.

05-05-2024, 12:51 AM	#2
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,543 Likes: 2,238 Liked 1,878 Times in 578 Posts	Re: Pinion angle on 340 Duster 1 to 1 1/2 down as I recall. They do not need the larger pinion angle down that the old Superstock and Launchers required. John Calvert is a great guy and I never hesitate to ask him anything suspension related! __________________ John Irving 741 Stock 741 Super Stock Last edited by GTX JOHN; 05-05-2024 at 12:55 AM.

05-05-2024, 10:13 AM	#3
Coleydog Senior Member Join Date: Jul 2014 Posts: 567 Likes: 35 Liked 48 Times in 33 Posts	Re: Pinion angle on 340 Duster Thanks, I’ll weld it up today

05-05-2024, 12:01 PM	#4
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,438 Likes: 780 Liked 703 Times in 206 Posts	Re: Pinion angle on 340 Duster The older installation instructions used to recommend 3-4 degrees angle ,but I see the new instructions no longer mention pinion angle . I've always installed them at 4*. I'd call Calvert for a recommendation. __________________ Tom Goldman 1500 SG , 1506 STK

05-05-2024, 05:25 PM	#5
Coleydog Senior Member Join Date: Jul 2014 Posts: 567 Likes: 35 Liked 48 Times in 33 Posts	Re: Pinion angle on 340 Duster I think I’ll wait till the block and trans case-main shaft are in car to see where their centerline lays. I can get 2 birds on that making up the SS headers at same time. Like John said 1 to 2-1/2 down from that. Awhile back I saw a vid where a guy had a go-pro camera under car to watch the launch, that rear did a lot of wrap up and movement. So I don’t have experience with Cals, thats the reason I’m asking real world A-Body racers their setups. Appreciate all comments from our expert racers.