https://www.spohn.net/support en-us https://www.spohn.net/support ActiveKB NX tech@spohn.net Sat, 11 Apr 2026 12:18:46 EDT 20 https://www.spohn.net/support/questions/1/ https://www.spohn.net/support/questions/1/ Vehicle Set-Up: Make sure your vehicle is at ride height - suspension loaded. You can not have your rear end "hanging". The vehicle does not have to be level, no matter the angle of the car you're still measuring the difference between the two angles. Setting Pinion Angle There are two angles to deal with: 1) Driveshaft angle 2) Pinion angle You subtract pinion angle from driveshaft angle to get TRUE pinion angle, here's how you do it: First, had you measured your stock drive shaft angle and pinion angle you would have calculated a 0 degrees TRUE pinion angle. This is how all cars come from the factory. Using an angle finder place it on the underside of the driveshaft and record the angle indicated from the driver's side of the vehicle. Next, place the angle finder under the flat surface of the pinion yoke (this surface is parallel with the pinion shaft) and record the angle indicated. Record both angles from the driver’s side of the vehicle. On the driveshaft anything to the left of 0 is positive, on the rear end anything to the right of 0 is negative. Subtract the pinion angle from the driveshaft angle. The result is "TRUE Pinion Angle". In order to apply preload you need negative TRUE pinion angle. Adjust so that the front of the pinion goes down; continue to check each angle until the pinion angle is more degrees down than the driveshaft angle. We recommend –1 degrees on a mildly modified daily driven car. For high horsepower applications we have gotten the best results with –2 degrees. There is no reason to run more negative angle than that, it will actually hurt your performance because it will induce driveline bind. Here's a tip. When adjusting for your TRUE pinion angle, count the number of flats (or the 1/6 of a turn) as you turn the adjuster, to know how many turns it takes to adjust 1 degree of negative TRUE pinion angle and in what direction (clockwise, or counter-clockwise). Once you know that, then adjusting the arm at the track or before a race will take almost no time, and no angle finder will be needed. Adjusting your Spohn Arm: You adjust the pinion angle by turning the pinion angle adjuster either clockwise or counter-clockwise. As you turn the adjuster you will see the pinion nose of the rear housing moving up/down. Moving the rear housing's pinion nose down will give you more of a negative pinion angle degree, and up will give you more of a positive pinion angle degree. You will quickly learn that it does not take many turns to adjust the angle by several degrees, so go slowly and check your angles often. Example: From the driver's side of the vehicle you have 1 to the left of 0 (positive 1) underneath the driveshaft. You have 3 to the right of 0 (negative 3) under the pinion yoke. +1 minus -3 = -2 Spohn Performance Fri, 21 May 2010 18:51:34 GMT https://www.spohn.net/support/questions/277/ https://www.spohn.net/support/questions/277/ This article is a master list of links that will answer any question you may have about ordering a new aftermarket rear end. If you still have questions after reviewing these articles feel free to shoot us an email or give our tech line a call at 1-888-365-6064. Ordering A Rear End - The Master List of Frequently Asked Questions I'm ordering a rear end, what is the difference between the different center section differential types? (article link) How to measure and order a custom length rear end (article link) What is the difference between Pro and Street gears? (article link) Can I order a rear end with a spool and keep my ABS on my 1993-2002 F-Body Camaro & Firebird? (article link) How do I know if I have 3 channel or 4 channel ABS on my 1993-2002 F-Body Camaro & Firebird? (article link) Can I use 4th Gen rims with no spacers on Moser or Strange rear ends on my 1982-1992 F-Body Camaro & Firebird? (article link) What rear brakes can be installed on the new rear end? (article link) What gear oil should I use in my new rear end? (article link) I'm ordering a Strange rear end for a 1998-2002 F-Body. Where should I send my stock brake backing plates? (article link) Do you carry rear ends for applications other than what you have on your website? (article link) How do I know what spline axles and center section I will need? (article link) What is the difference between the 12 Bolt, Ford 9" and Dana 60 rear ends? Which should I get? (article link) What rear end gear ratio should I run for my application? Gear ratio calculator (article link) Which wheel studs do I need for my car when ordering a rear end? (article link) What's the difference between chrome & aluminum rear end covers on 12 Bolt & Dana 60 rear ends? (article link) I'm ordering a rear end for a 1982-2002 F-Body Camaro Firebird, do I need the sway bar installation kit? (article link) I'm ordering a rear end, do I need the conversion u-joint? (article link) I'm ordering a rear end, do I need the control arm relocation brackets? What are they? (article link) I'm ordering a rear end, what is the difference between a bare and powder coated housing? (article link) What is the difference between standard and gun drilled axles? (article link) I'm ordering a rear end, what is the difference between axle flanges? Standard, Star & Lightening Holes? (article link) I'm ordering a Ford 9" rear end, what is the difference between a nodular iron and an aluminum center section? (article link) I'm ordering a Ford 9" rear end, do I need the fill and drain bungs installed? What are they? (article link) I'm ordering a Strange rear end, do I need the standard or chrome moly pinion yoke? (article link) I'm ordering a rear end, does it come with the housing bushings for the rear upper control arms installed? (article link) What is the difference between the M9 and a standard Ford 9" rear end housing? (article link) How can I get a shipping price quote on a rear end? (article link) I'm ordering a rear end, how long does it take to ship out? How does it ship? (article link) I'm ordering a rear end, is there any warranty on them? (article link) I'm ordering a rear end, do I need to specify no c-clips or use a c-clip eliminator? (article link) I'm ordering a rear end, will I need to get a new driveshaft? (article link) I'm ordering a rear end, will the bolt pattern match my vehicle type? (article link) What size wheels and rims fit over the 11" rear drum brake kit for aftermarket rear ends? (article link) Can I get an aluminum rear cover on a Strange Engineering Dana 60 rear end for a 1982-2002 GM F-Body Camaro & Firebird? (article link) I'm ordering a rear end, what are the brake line, emergency brake cable and brake line clamp options? (article link) I'm ordering a rear end, what is the back brace option? (article link) What is a full floater rear end? (article link) I have aftermarket disc brakes for my factory rear end, will they fit on an aftermarket Moser or Strange rear end? (article link) Spohn Performance Wed, 05 Aug 2015 18:43:18 GMT https://www.spohn.net/support/questions/37/ https://www.spohn.net/support/questions/37/ Single Adjustable shocks mean that when you adjust the shock looser or stiffer you are adjusting both the rebound and the compression together, the shock will be loose or stiff both ways. Double Adjustable shocks mean that you are adjusting the rebound and the compression independently. You could adjust the shock to have a loose rebound for great weight transfer and a stiffer compression for a more controlled landing. Double adjustable shocks give you the most shock adjustment control of any other choice. "R" Series front shocks are adjustable just like a single adjustable front shock but the compression adjustment range is stiffer. This allows you to set the shock to a 90/10 type setting at the drag strip and go back to a stock shock type setting when driving on the street. They are designed for front drag racing applications to maximize weight transfer. For more detailed information with shock dyno charts see the .pdf file attached below. Spohn Performance Wed, 13 Jul 2011 16:28:13 GMT https://www.spohn.net/support/questions/16/ https://www.spohn.net/support/questions/16/ Adjustable rear lower control arms are not used to adjust pinion angle and are not required if lowering your ride height. We offer adjustable rear lower control arms (LCAs) to allow for two things. For those installing very large tires they allow you to push/pull your rear end front/back to gain the tire clearance you need in the wheel well. Secondly, many fabricated aftermarket rear ends do not always have the control arm mounts welded on "perfectly". The adjustable LCAs allow you to square up your rear end. With adjustable LCAs and Panhard Bar installed you can do a four wheel alignment to get a perfectly square set up. Many of our LCAs only come adjustable due to the fact that the mounting ends are threaded (rod ends, Del-Sphere, etc.). You may desire these mounting ends but don't feel you need the adjustment feature. Know that all of our adjustable components ship to you jig set at OEM length. If you have no desire to do any adjusting, simply install them as they are shipped and you will be good to go. Spohn Performance Tue, 04 May 2010 14:14:52 GMT https://www.spohn.net/support/questions/15/ https://www.spohn.net/support/questions/15/ Normally, if you will be running the stock rear end and will not be lowering your ride height then you do not "need" an adjustable panhard bar. If you plan to lower your ride height and/or install an aftermarket rear end then we suggest getting an adjustable panhard bar to allow you to properly center your rear end laterally in the car. Spohn Performance Wed, 05 May 2010 01:48:18 GMT https://www.spohn.net/support/questions/2/ https://www.spohn.net/support/questions/2/ We ask what type of rear end you have when ordering a torque arm because the Strange Dana 60 (S60) rear end requires a rear mounting bracket that is shaped differently for proper fitment. Our normal rear mounting bracket will work with any stock or aftermarket 12 bolt and Ford 9" rear ends. So if you order a torque arm and say you have a stock rear end and later down the road you get a 12 bolt or 9" rear end the torque arm will fit just fine. The only time you would need to contact us for a different mounting bracket would be for the Strange Dana 60 rear. You can also modify your rear bracket yourself to fit the Dana 60 rear. Spohn Performance Wed, 05 May 2010 01:46:30 GMT