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Description
The 1935–1941 Ford Truck Weld-In SuperSlide Parallel Rear Leaf Spring Kit by Posies (Part #8040S) converts mid-to-late 1930s Ford vehicles from the stock transverse leaf spring setup to modern parallel rear leaf springs.
The 8040S Single Position Kit mounts the springs directly in line along the bottom of the factory frame rails. It delivers a moderate, fixed lowered stance—sitting slightly higher than Posies' 4-position adjustable kit—making it the ideal match for front setups utilizing a reverse eye spring or an Independent Front Suspension (IFS) with standard height spindles.
Key Features & Application Highlights
Vehicle Compatibility: Fits 1935, 1936, 1937, 1938, 1939, and 1940 Ford Passenger Cars, as well as 1935 through 1941 Ford 1/2-Ton Trucks.
Single-Position Stance Alignment: Centers the rear wheels precisely within the fender openings while lowering the rear profile for a balanced street rod stance.
Under-Frame Mounting: Mounts directly in line along the bottom flange of the factory frame rails.
SuperSlide Inter-Leaf Technology: Features Posies' signature moly-nylon inter-leaf buttons between leaf tips to eliminate friction, rust binding, and squeaks.
Driveline Requirement:Open driveline required. Designed exclusively for open-driveline rear end conversions (e.g., Ford 8", Ford 9", GM 10/12-bolt); will not work with original torque tube driveshafts.
Included Components & Package Specifications
The 8040S complete weld-in kit ships across separate component packages:
Component Group
Product Weight
Dimensions (L x W x H)
Included Items / Contents
SuperSlide Springs
Approx. 54.0 lbs
44" x 6" x 5"
Pair of application-specific SuperSlide rear leaf springs
Hardware & Parts Box
Approx. 28.0 lbs
13" x 13" x 10"
Weld-on spring mounts, shackles, axle saddles, U-bolts, plates, rear shock kit, and hardware
Optional Rear Sway Bar Box
Approx. 18.0 lbs
51" x 15" x 5"
Optional rear anti-sway bar, links, and mounting brackets
Technical Specification Matrix
Feature / Metric
Technical Specification Detail
Manufacturer & Part #
Posies Rods & Customs (P/N: 8040S)
Vehicle Application
1935–1940 Ford Cars / 1935–1941 Ford Trucks
Mounting Architecture
Weld-In Parallel Rear Springs (In Line / Under-Frame)
Inter-Leaf Damping
Moly-Nylon SuperSlide Friction-Reduction Buttons
Included Hardware
Springs, Mounts, Shackles, Saddles, U-Bolts, Plates, Shock Kit, Hardware
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Refund Policy
We offer a 30-day return policy, which means you have 30 days from the date you receive your item to request a return.
Eligibility for Returns
To be eligible for a return, your item must be:
In the same condition as received
Unworn or unused
With original tags attached
In its original packaging
You must also provide a receipt or proof of purchase.
How to Start a Return
To initiate a return, please contact us at jonathon@hotrodhardware.com. Once your return request is approved, you will be provided with the return address and, if applicable, an RMA (Return Merchandise Authorization) number.
Important: Items sent back without prior authorization will not be accepted.
If you have any questions regarding your return, feel free to contact us at the email above.
Damages and Issues
Please inspect your order upon delivery. If your item is defective, damaged, or if you received the wrong item, contact us immediately so we can evaluate the issue and resolve it promptly.
Exceptions / Non-Returnable Items
The following items are not eligible for return:
Custom or personalized products (including special orders)
Hazardous materials, flammable liquids, or gases
Sale items
Gift cards
If you are unsure whether your item qualifies, please contact us before initiating a return.
Exchanges
The fastest way to receive a replacement item is to return your original item (once approved) and place a new order separately.
Free Shipping Orders
Orders that qualified for free shipping are subject to deduction of the original outbound shipping cost if the item is returned.
Refunds
Once your return is received and inspected, we will notify you regarding the approval status of your refund.
If approved:
Refunds will be issued to your original payment method
Any applicable restocking fees will be deducted
Original shipping charges (if applicable) will be deducted
Return shipping costs (if arranged by Hot Rod Hardware) will be deducted
Please note:
Payment processing fees (including PayPal, Amazon Pay, or other merchant fees) are non-refundable
It may take additional time for your bank or credit card provider to process and post the refund
