What Pitman Arm? S10 manual box in 2nd Gen Camaro

Jeff Kempton · 05-08-2021, 03:26 PM

I'm looking for a part number or application info for a pitman arm that allows me to use a S10 manual steering box in a 1971 Camaro Stocker. The shaft is larger on the Camaro power steering box than the S10 box, so I can't just swap that arm over, and the S10 box has no arm on it so I don't know if a factory S10 one would work. I'd prefer to use the good S10 box that I have rather than buying a new Flaming River etc. box, so hopefully someone here on ClassRacer can help out. Thanks in advance!

MAURICE BLENDHEIM · 05-08-2021, 10:32 PM

Jeff... What is the Centre-Centre measurement of your Idler Arm? Also what is the Spline diameter of the S10 Box that you have? and Sector Shaft Diameter? Maurice.

Jeff Kempton · 05-09-2021, 08:39 PM

Hi Maurice, the center to center length of the pitman arm off the original PS box is 6 3/4" and it is straight with no offset. It has a tapered hole (0.545-0.625") for connection to a ball joint on the centerlink. Part number on the original PS arm is 3964881 for reference, but as I originally noted the shaft diameter on this box is bigger than the S10 box so it is not interchangable.

I just noticed that you asked the length of the idler arm and not the pitman, I will check that tomorrow.

The sector shaft is 1 1/8" at the seal and the OD at the splines is 1.110", with the threaded end of the shaft 7/8" diameter.

FED 387 · 05-09-2021, 09:01 PM

you need a 4 bolt cover S-10 85-93 manual steering box and the 71 Camaro power steering pitman arm not sure but 3 bolt cover is supposedly different--FED 387

Jeff Kempton · 05-10-2021, 07:19 AM

FED 387, the one I have is the 3 bolt cover version and the spline is too small to use the Camaro PS arm. Is it worth going any further with it or do I need to find a 4 bolt one or go aftermarket?

Maurice, the idler arm is 6" center to center.

Billy Nees · 05-10-2021, 07:51 AM

You need a box with the 4 bolt cover. 3 bolt cover fits early Camaro.

Jeff Kempton · 05-10-2021, 10:32 AM

Thanks everyone for the feedback, much appreciated!

Eman · 05-11-2021, 11:56 PM

I guess I'm late to the party but on my 3rd gen Camaro I used my Camaro pitman arm on my S10 box.

05-08-2021, 03:26 PM	#1
Jeff Kempton Member Join Date: Apr 2004 Location: Halifax, Nova Scotia, Canada Posts: 219 Likes: 832 Liked 47 Times in 23 Posts	What Pitman Arm? S10 manual box in 2nd Gen Camaro I'm looking for a part number or application info for a pitman arm that allows me to use a S10 manual steering box in a 1971 Camaro Stocker. The shaft is larger on the Camaro power steering box than the S10 box, so I can't just swap that arm over, and the S10 box has no arm on it so I don't know if a factory S10 one would work. I'd prefer to use the good S10 box that I have rather than buying a new Flaming River etc. box, so hopefully someone here on ClassRacer can help out. Thanks in advance!

05-08-2021, 10:32 PM	#2
MAURICE BLENDHEIM Senior Member Join Date: Jun 2011 Location: Langley (no igloos), British Columbia, Canada Posts: 551 Likes: 269 Liked 228 Times in 78 Posts	Re: What Pitman Arm? S10 manual box in 2nd Gen Camaro Jeff... What is the Centre-Centre measurement of your Idler Arm? Also what is the Spline diameter of the S10 Box that you have? and Sector Shaft Diameter? Maurice. Last edited by MAURICE BLENDHEIM; 05-08-2021 at 11:42 PM.

05-09-2021, 08:39 PM	#3
Jeff Kempton Member Join Date: Apr 2004 Location: Halifax, Nova Scotia, Canada Posts: 219 Likes: 832 Liked 47 Times in 23 Posts	Re: What Pitman Arm? S10 manual box in 2nd Gen Camaro Hi Maurice, the center to center length of the pitman arm off the original PS box is 6 3/4" and it is straight with no offset. It has a tapered hole (0.545-0.625") for connection to a ball joint on the centerlink. Part number on the original PS arm is 3964881 for reference, but as I originally noted the shaft diameter on this box is bigger than the S10 box so it is not interchangable. I just noticed that you asked the length of the idler arm and not the pitman, I will check that tomorrow. The sector shaft is 1 1/8" at the seal and the OD at the splines is 1.110", with the threaded end of the shaft 7/8" diameter.

05-09-2021, 09:01 PM	#4
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,349 Likes: 326 Liked 280 Times in 150 Posts	Re: What Pitman Arm? S10 manual box in 2nd Gen Camaro you need a 4 bolt cover S-10 85-93 manual steering box and the 71 Camaro power steering pitman arm not sure but 3 bolt cover is supposedly different--FED 387

05-10-2021, 07:19 AM	#5
Jeff Kempton Member Join Date: Apr 2004 Location: Halifax, Nova Scotia, Canada Posts: 219 Likes: 832 Liked 47 Times in 23 Posts	Re: What Pitman Arm? S10 manual box in 2nd Gen Camaro FED 387, the one I have is the 3 bolt cover version and the spline is too small to use the Camaro PS arm. Is it worth going any further with it or do I need to find a 4 bolt one or go aftermarket? Maurice, the idler arm is 6" center to center.

05-10-2021, 07:51 AM	#6
Billy Nees VIP Member Join Date: Oct 2002 Location: On a hilltop in Pa. Posts: 4,222 Likes: 3,095 Liked 6,784 Times in 1,522 Posts	Re: What Pitman Arm? S10 manual box in 2nd Gen Camaro You need a box with the 4 bolt cover. 3 bolt cover fits early Camaro. __________________ Billy Nees 1188 STK, SS World's greatest Under-Achiever!

05-10-2021, 10:32 AM	#7
Jeff Kempton Member Join Date: Apr 2004 Location: Halifax, Nova Scotia, Canada Posts: 219 Likes: 832 Liked 47 Times in 23 Posts	Re: What Pitman Arm? S10 manual box in 2nd Gen Camaro Thanks everyone for the feedback, much appreciated!

05-11-2021, 11:56 PM	#8
Eman Member Join Date: May 2014 Location: E TN Posts: 441 Likes: 14 Liked 105 Times in 60 Posts	Re: What Pitman Arm? S10 manual box in 2nd Gen Camaro I guess I'm late to the party but on my 3rd gen Camaro I used my Camaro pitman arm on my S10 box.