Position
Air suspension
Air suspension
Parts / NAVISTAR (LH)
55-1231
This page shows the published specs for 55-1231. Compare them with the spring in hand before you ask about price, stock, or fit.
Technical record
Part numbers, specs, and how to ask about this part.
Use these published details to compare the spring in hand and send the right inquiry without retyping everything.
Spring group
Airlink
Spring stage
Single stage
Airlink style
Airlink H type
Leaf count
2
A-side length (La)
26.26 in
B-side length (Lb)
22.13 in
Camber / free arch (C)
0.26 in
Eye Diameter (Ø Eye)
A-side 2.48 in · B-side needs APM confirmation
Material width / thickness (W)
2.99 × 0.40 × 2.00 in
Part details
Part numbers and reference numbers.
Start here, then compare the spring in hand.
- SRI number
- 55-1231
- OEM references
- 3544137C94 · 4C4Z5560EA
These reference numbers help you check the listing. The guide below is only a general measuring guide for the spring in hand.
Cart or quote
Use the reviewed path for this part.
If this part has reviewed Shopify and Fuse5 mapping with available inventory, add it to cart. Otherwise, save it to a quote list and keep researching.
- Part number: 55-1231
- Vehicle shown: NAVISTAR (LH) 3544137C94/4C4Z5560EA
- Spring group: Airlink
- Spring stage: Single stage
- Airlink style: Airlink H type
- Checkout review: cart review keeps the part tied to this exact public catalog page before Shopify payment.
- Quote assistance: quote list combines several part numbers into one email or form inquiry.
Shopping area
Add this spring to the pallet.
Checkout route
Checking reviewed inventory and checkout mapping...
Price confirmed at checkout Inventory checked by APM USA
Quote actions use ask@mrapmusa.com and include the page link and specs shown above. Existing customers can keep going in customer login.
Measurement guide
Measure the spring in hand at these points.
This is a general measuring guide for the spring in hand. It is not an exact factory print for this part.
Selected diagram · Airlink H type spring diagram
Airlink H type spring diagram
Use this DXF-derived Airlink H type drawing as a general shape and measurement guide. Match the color-coded letters below to the drawing before you ask about 55-1231. This is a general fitment guide, not an exact factory print.
La
A-side eye center to center bolt
Lb
B-side eye center to center bolt
C
Camber / free arch at the center bolt
Ø Eye
Spring eye diameter
W
Spring pack width; confirm thickness from the material-size row
- La A-side length
- 26.26 in Measure from the front eye center to the center bolt.
- Lb B-side length
- 22.13 in Measure from the rear eye center to the center bolt. Derived from the source length pair.
- C Camber / free arch
- 0.26 in Measure vertically at the center bolt from the eye-center line to the spring pack.
- Ø Eye Eye Diameter
- A-side 2.48 in · B-side needs APM confirmation Check the spring eye diameter at both ends.
- W Material width / thickness
- 2.99 × 0.40 × 2.00 in Match the first material-size value to the W width callout, then confirm the thickness stack on the removed spring pack.
- Leaf count
- 2 leaves Count the main leaves in the pack and compare the spring layout before asking about fit.
Before you ask
Check these points first.
- Compare this part number to the spring tag, old invoice, or service record for NAVISTAR (LH) 3544137C94/4C4Z5560EA.
- Measure the length marks on the removed spring: La / a-side length: 26.26 in; Lb / b-side length: 22.13 in.
- Check the hardware marks: Ø Eye / eye diameter: A-side 2.48 in · B-side needs APM confirmation.
- Confirm the secondary checks: C / camber / free arch: 0.26 in; W / material width / thickness: 2.99 × 0.40 × 2.00 in; leaf count: 2 leaves.
- Vehicle name and OEM numbers help narrow it down, but they do not confirm fit by themselves.