QuickLinks -- Click here to rapidly navigate through this document

Pricing Supplement 15 dated April 23, 2002	Rule 424(b) (3)
(To Prospectus dated March 22, 2000 and Prospectus Supplement dated March 22, 2000)	File No. 333-31502

PACCAR FINANCIAL CORP.
Medium-Term Notes, Series J—Floating Rate
CUSIP# 69371RVR4

        We are hereby offering to sell Notes having the terms specified below to you with the assistance of:

/ /	Goldman, Sachs & Co.
/x/	Banc of America Securities LLC
/ /	Merrill Lynch & Co.
/ /	Morgan Stanley Dean Witter
/ /	Salomon Smith Barney
/x/	BNP Paribas Securities Corp.
/ /	acting as / / principal /x/ agent

at: / / varying prices related to prevailing market prices at the time of resale /x/ a fixed initial public offering price of 100% of the Principal Amount.

Principal Amount: $50,000,000	Original Issue Date:	April 26, 2002
Agent's Discount or Commission: 0.30%	Maturity Date:	April 26, 2005
Net Proceeds to Company: $49,850,000	Interest Payment Date(s):	Quarterly on the 26th or next Business day of Jan., Apr., Jul. and Oct., via modified following business day convention, commencing July 26, 2002

Calculation Agent:

Interest Calculation:
	/x/	Regular Floating Rate Note	/ /	Floating Rate/Fixed Rate Note
	/ /	Inverse Floating Rate Note		Fixed Rate Commencement Date:
		Fixed Interest Rate:		Fixed Interest Rate:
	/ /	Other Floating Rate Note (see attached)

Initial Interest Rate: To Be Determined
Initial Interest Reset Date: July 26, 2002
Interest Reset Date(s): Quarterly on the 26^th or next business day of Jan., Apr., Jul. and Oct., via modified following business day convention, commencing July 26, 2002

Interest Rate Basis:
/ /	CD Rate			/ /	Federal Funds Rate		/ /	Prime Rate
/ /	Commercial Paper Rate			/x/	LIBOR		/ /	Treasury Rate
/ /	CMT Rate				Designated LIBOR Page:		/ /	Other (see attached)
	/ /	CMT Telerate Page 7051			/ /	LIBOR Reuters Page
	/ /	CMT Telerate Page 7052			/x/	LIBOR Telerate Page 3750
		If CMT Telerate Page 7052:		LIBOR Currency:
		/ /	Weekly Average
		/ /	Monthly Average

Index: 3 Month LIBOR
Spread (+/-): + 0.10%
Spread Multiplier: N/A
Maximum Interest Rate: N/A
Minimum Interest Rate: N/A

Day Count Convention:
	/ /	30/360 for the period from                          to                         .
	/x/	Actual/360 for the period from April 26, 2002 to April 26, 2005.
	/ /	Actual/Actual for the period from                          to                         .

Redemption:
	/x/	The Notes may not be redeemed prior to the Maturity Date.
	/ /	The Notes may be redeemed at the option of the Company prior to Maturity Date.
		Initial Redemption Date:
		Initial Redemption Percentage:         %
		Annual Redemption Percentage Reduction:         % until Redemption Percentage is 100% of the Principal Amount.
	/ /	The Notes shall be redeemed by the Company prior to the Maturity Date (see attached).

Repayment:
	/x/	The Notes may not be repaid prior to the Maturity Date.
	/ /	The Notes may be repaid prior to the Maturity Date at the option of the holder of the Notes.
		Optional Repayment Date(s):

Currency:
	Specified Currency: USD (If other than U.S. dollars, see attached)
	Minimum Denominations:                          (Applicable only if Specified Currency is other than U.S. dollars)
	Exchange Rate Agent:                          (Applicable only if Specified Currency is other than U.S. dollars)

If Discount Note, check / /
        Issue Price:         %

Form: /x/ Book-Entry / / Certificated

Other Provisions:

QuickLinks

PACCAR FINANCIAL CORP. Medium-Term Notes, Series J—Floating Rate CUSIP# 69371RVR4