Help is just a click away!
Click here to chat with a Speedway Team Member
Online - Chat with us!
Products to Compare (max of 3)
Compare These Parts
Talk to the Experts. Call 800.979.0122, 7am-10pm, everyday.
Customer Service
Since 1952
Talk to the Experts. Call 800.979.0122
Shop By
Street Race Truck More... The Toolbox

Spring-Over Axle Kit Q&A


In this Tech Tip, a customer has a few questions for John about one of our spring over axle kits.

“Hi, I have a few questions about your spring over 4" drop axle, P/N 91339005.

  • Where do I weld the batwing to the tube from the center line?
  • What should the camber be, and should it negative for a straight ride?
  • Is there an adapter to bolt a shock mount on?
  • How far back should the hairpin mounts be on the frame and how far down should they be placed from the top of the frame?”

You inquired about our Spring-Over Axle kit, P/N 91339005 and about some specifications. These dimensions can vary according to the spring you are using on top of the axle. In the particular kit you referenced the Hairpin/radius rod brackets are spaced 32" apart. The spring used is a 26". Camber is preset into the axle depending whether Ford or Chevy and they are not the same. The Ford is set at 8 degrees and Chevy at 4 1/4. Caster is lean back of the axle at the top and when the axle is set up in the car should be between 5-7 degrees positive. There are many options for shock mounts but the easy way is to use a shackle with the shock stud, P/N 715175. The location for the hairpin brackets and how far down depends on your spring mount or cross member location in the frame, and the caster you are setting into the axle. Feel free to visit us on the web at or call 1-800-979-0122 with questions or to place an order.

  • John W.

Products Featured in this Article

Related Articles

Oil Bypass Plug on an Early Hemi
by Tim Matthews - Posted in Tech
Tim M. is all about the classic, traditional hot rod style when it comes to his projects, he’s no stranger to knowing when modern parts mean better performance. Follow along as he adds a bit of modern technology to his Red Ram Hemi!
Quick Change R&P Ratio Without Opening Up the Rear
How to determine the quick change R&P ratio without opening up the rear in street cars with quick changes, sprint cars, modifieds, late models and GOTRA cars.
Wiring Harnesses for a 1929 Ford
by John Wulbern - Posted in Tech Tips
In this Tech Tip, a returning customer asks for advice on wiring harnesses for his ’29 Ford roadster project.
Proper Power Steering for a 1955 Chevy BelAir
by John Wulbern - Posted in Tech Tips
In this Tech Tip, a customer asked about the correct parts needed to set up the power steering system on his 1955 BelAir.
How to Choose Between Tempered and Laminated Glass
Learn the different purposes of tempered glass and laminated glass.
Water Pump Options for the Chevy Crate Engine
by John Wulbern - Posted in Tech Tips
In this Tech Tip, a customer asked for some recommendations on water pumps for his 1934 Chevy Coupe build.
Trunk Latches and Door Handles on a 1932 Ford
by John Wulbern - Posted in Tech Tips
In this Tech Tip, a customer asked about a discreet style trunk latch for his 1932 Ford.
T-Bucket Interiors
by John Wulbern - Posted in Tech Tips
In this Tech Tip, John answers a customer question about the Speedway Motors fiberglass T-Bucket kit bodies, and the potential need for reinforcement.
Cooling a '46 Ford Sedan
by John Wulbern - Posted in Tech Tips
In this Tech Tip, John offers some guidance to a customer looking to cool his 1946 Ford Sedan.
Header Suggestions for a '33 Ford
by John Wulbern - Posted in Tech Tips
In this Tech Tip, one of our customers asks for a suggestion on exhaust headers for his 1933 pickup.