USA Standard

AMC 20 29 Spline Steel Spool

$269.99

SKU: ZP FSM20-3-29

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The Zumbrota Drivetrain ZP FSM20-3-29 is a robust steel spool engineered for AMC 20 axles featuring 29 spline axles. This differential component is designed to handle gear ratios of 3.08 and higher, offering a significant upgrade for off-road performance. By providing 100% lockup, it ensures maximum traction when navigating difficult terrain. This spool is specified for a range of vehicles, including 1976-1983 Jeep CJ5 (Rear), 1976-1986 Jeep CJ7 (Rear, 4WD), 1976-1986 Jeep J10 (Rear), 1981-1985 Jeep Scrambler (Rear), 1979-1986 Jeep Wagoneer (Rear), 1968-1974 American Motors Javelin (Rear), 1968-1970 American Motors AMX (Rear), 1978-1979 American Motors Concord (Rear, RWD), 1970-1977 American Motors Hornet (Rear, RWD), 1971-1978 American Motors Matador (Rear), 1975-1980 American Motors Pacer (Rear, RWD), and 2002-2006 Hummer H1 (Front, Rear). As with any performance differential component, professional installation is recommended to ensure proper setup and function.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandUSA Standard
Part NumberZP FSM20-3-29
CategoryDrivetrain

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

View Full Shipping Policy