# Service bulletin AS\-21766

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10039052
- Published by NHTSA: 2011\-07\-07
- Manufacturer's number: AS\-21766
- Manufacturer's date: 2011\-03\-01
- NHTSA component: SUSPENSION:FRONT:HUB

## NHTSA's summary

FORD: IN COLD WEATHER THERE IS A FRONT HUB ENGAGEMENT CONCERN. 2011 F SUPER DUTY. \*RM

## The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

## Components

Suspension

## Vehicles listed

- 2011 FORD F\-250 SD
- 2011 FORD F\-350 SD
- 2011 FORD F\-450 SD
- 2011 FORD F\-550 SD

## Other bulletins for the same vehicles and component

- [SSM 48494](/bulletins/10170992.md), 2020-02-04, Service bulletin: SUSPENSION. Some 2005\-2020 F\-Super Duty 4x4 vehicles operated in extreme dust, mud or tar sand conditions may exhibit accelerated 4x4 vacuum hub seal and or wheel bearing wear as a result of harsh operating conditions. A knuckle seal shield kit is now available for customer purchase. The kit is designed for severe duty and is non warrantable. The knuckle seal shield kit GC3Z\-54024A38\-A includes an installation instruction sheet
- [SSM 47979](/bulletins/10160885.md), 2019-06-06, Service bulletin: SUSPENSION:FRONT:WHEEL BEARING; SUSPENSION. Some 2005\-2019 F\-Super Duty 4x4 vehicles operated in extreme dust, mud or tar sand conditions may exhibit accelerated 4x4 vacuum hub seal and or wheel bearing wear as a result of harsh operating conditions. A knuckle seal shield kit is now available for customer purchase. The kit is designed for severe duty and is non warrantable. The knuckle seal shield kit GC3Z\-54024A38\-A includes an installation instruction sheet
- [TSB\-14\-0161](/bulletins/10058097.md), 2015-07-31, Service bulletin: SUSPENSION:REAR:SPRINGS:LEAF SPRING ASSEMBLY:U\-BOLT, LEAF SPRING TO AXLE; EQUIPMENT ADAPTIVE/MOBILITY. FORD: PROCEDURE INFORMATION REGARDING THE CHANGE IN VEHICLE ATTITUDE APPEARANCE BY RAISING REAR OF TRUCK AND MODIFICATION STEPS ACCORDING TO SPECIFICATIONS OF ENGINEERING. MODEL 2011\-15 F\-250 SD. \*PE
- [12\-2\-5](/bulletins/10044118.md), 2012-05-14, Service bulletin: SUSPENSION:FRONT:HUB; POWER TRAIN:AXLE HUBS. FORD: SOME VEHICLES EXHIBIT A 4X4 NOT ENGAGING, NOT STAYING ENGAGED AND/OR UNLOCKING IN EXTREME COLD TEMPERATURES BELOW \-18 DEGREES CELSIUS OR 0 DEGREES FAHRENHEIT. INCLUDE FORD MODEL F250, F350,F450, AND F550 MODEL YEARS 2011\-2012. \*JS
- [CSP\-10B21](/bulletins/10041244.md), 2011-09-21, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE; SUSPENSION:REAR:SPRINGS. FORD: 2011 F250. INCORRECT REAR SPRINGS WERE INSTALLED. THERE MAY BE STEERING WANDER WHEN PULLLING A VEHICLE. \*RM

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