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Exhibit 99.1

Guidance Update

April 8, 2010

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2

Safe Harbor

Statement

Information provided and statements contained in this presentation that are not purely historical are

forward-looking statements within the meaning of Section

27A of the Securities Act of 1933, as

amended, Section

21E of the Securities Exchange Act of 1934, as amended, and the Private Securities

Litigation Reform Act of 1995. Such forward-looking statements only speak as of the date of this

presentation and the Company assumes no obligation to update the

information included in this

presentation. Such forward-looking statements include information concerning our possible or assumed

future results of operations, including descriptions of our business strategy. These statements often

include words such as “believe,”

“expect,”

“anticipate,”

“intend,”

“plan,”

“estimate,”

or similar

expressions. These statements are not guarantees of performance or results and they involve risks,

uncertainties, and assumptions. For a further description of these factors, see Item

1A, Risk Factors,

included within our Form 10-K for the year ended October

31, 2009, which was filed on

December 21, 2009.  Although we believe that these forward-looking statements are based on

reasonable assumptions, there are many factors that could affect

our actual financial results or results

of operations and could cause actual results to differ materially from those in the forward-looking

statements. All future written and oral forward-looking statements by us or persons acting on our behalf

are expressly qualified in their entirety by the cautionary statements contained or referred to above.

Except for our ongoing obligations to disclose material information as required by the federal securities

laws, we do not have any obligations or intention to release publicly any revisions to any forward-

looking statements to reflect events or circumstances in the future or to reflect the occurrence of

unanticipated events.

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3

Other Cautionary Notes

•

The financial information herein contains audited and unaudited

information and has been prepared by management in good faith

and based on data currently available to the Company.  

•

Certain Non-GAAP measures are used in this presentation to assist

the reader in understanding our core manufacturing business.

We

believe this information is useful and relevant to assess and

measure the performance of our core manufacturing business as it

illustrates manufacturing performance without regard to selected

historical legacy costs (i.e. pension and other postretirement costs).

It also excludes financial services and other expenses that may not

be related to the core manufacturing business.  Management often

uses this information to assess and measure the performance of our

operating segments.

A reconciliation to the most appropriate GAAP

number is included in the appendix of this presentation.

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4

•

Focus is on reducing impact of cyclicality

–

Non-traditional/expansion markets

–

Grow parts

•

Improve cost structure while developing synergistic

niche businesses with richer margins

•

Improve conversion rate of operating income into

net income

•

Controlling our Destiny

Strategy: Leveraging What We Have and

What Others Have Built

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5

5

Insert PowerPoint

Presentation Name Here

Earnings Per Share vs. Industry Volume

2010 Guidance Range –

Revised April 2010

Reg

G reconciliation can be found on slide 12

$(10.00)

$(5.00)

$-

$5.00

$10.00

$15.00

$20.00

150

200

250

300

350

400

450

500

Traditional Industry Volume (Thousands of Units)

Revised

2010

Guidance

Midpoint

Original $1.6B  Segment

Profit Goal

@ 415k

units

$1.8B  Segment Profit    

Goal

@ 350k

units*

Original

2010

Guidance

Midpoint

Traditional Industry Volume (Thousands of Units)

Notes:

*  Assumes attainment of mature global growth by end of calendar year 2013

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6

Navistar Defense 2010 Sales Mix

Goal:  $2 Billion Sustainable

FY 2010

U.S. and FMS

Vehicles

Direct

Foreign

Vehicles

Services

Parts

FY 2009

Prior outlook provided on January 19th

Revised outlook

Parts

Capability

Insertion

Vehicles

U.S. and FMS

Vehicles

Direct Foreign

Vehicles

Services

Parts

U.S. and FMS

Vehicles

Direct Foreign

Vehicles

Services

Capability

Insertion

Parts

Parts

Capability

Insertion

Vehicles

Firm Orders

Opportunity

~$1B revenue

~$1.0-$1.2B revenue

~$2.0-$2.2B revenue

Firm Orders

Opportunity

~$2B revenue

~$0.6-$0.8B revenue

~$2.6-$2.8B revenue

~$3B revenue

7

2010 Guidance

We continue to invest today, to ensure the future

4/8/2010

guidance

includes

~

$50M

of

Mahindra/NC

2

and

other

JV

start up expenses

1/19/2010

Guidance

4/8/2010

Guidance

U.S. and Canada Industry

195,000 – 215,000

195,000 – 215,000

($Billions)

Sales and revenues, net

$12.6 – $13.1

$13.2 – $13.7

($Millions)

Manufacturing segment profit*

700 – 750

800 – 850

Below the line items

(553) – (547)

(582) – (586)

Income excluding income tax

147 – 203

218 – 264

Income tax expense

(20) – (40)

(20) – (30)

Net income attributable to Navistar International Corp. (NIC)

$127 – $163

$198 – $234

Diluted earnings per share ($'s) attributable to NIC

$1.75 – $2.25

$2.75 – $3.25

Weighted average shares outstanding: diluted(millions)

~ 72.5

~ 72.5

* Includes: non-controlling interest in net income of subsidiaries

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Manufacturing Segment Profit is not in accordance with, or an alternative for, U.S. generally accepted accounting principles (GAAP). The non-GAAP financial information presented herein should be considered

supplemental to, and not as a substitute for, or superior to, financial measures calculated in accordance with GAAP.  However, we believe that non-GAAP reporting, giving effect to the adjustments shown in the

reconciliation above, provides meaningful information and therefore we use it to supplement our GAAP reporting by identifying items that may not be related to the core manufacturing business.  Management often uses

this information to assess and measure the performance of our operating segments. We have chosen to provide this supplemental information to investors, analysts and other interested parties to enable them to perform

additional analyses of operating results, to illustrate the results of operations giving effect to the non-GAAP adjustments shown in the above reconciliations and to provide an additional measure of performance.

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Health Care Reform

•

Medicare Part D–Loss of Tax

Deduction:

No P&L impact to Navistar due to 

deferred tax valuation allowance

•

Medicare Advantage

Reimbursement for Medicare

Advantage is expected to go down

Exact impact of change is still TBD

•

Other impacts of new legislation

Excise tax on health care

Additional dependent coverage

•

Government support TBD

•

Medicare Part D

Navistar changed the OPEB

administration requiring enrollment

into Part D

•

Review coverage for active and

inactive employees

Restructure benefits

Legislation

Actions

9

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10

Appendix

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2010 Guidance

Guidance

Truck Industry Units

195,000

to

215,000

Revenue ($ Billions)

13.2

to

13.7

($ Millions (excluding EPS))

Mfg. Segment Profit

800

to

850

Below the line items

(582)

to

(586)

Profit Excluding Tax

218

to

264

Net Income attributable to NIC

198

to

234

Tax Rate

9%

to

11%

Diluted EPS attributable to NIC

$2.75

to

$3.25

# of shares

~72.5M

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12

SEC Regulation G –

Fiscal Year Comparison

U.S. and Canada Industry

414,500

350,000

($billions)

Sales and revenues, net

$ 15 +

$ 20 +

($millions)

Manufacturing segment profit*

$ 1,600

Below the line items

Income excluding income tax

Income tax expense

(298)

Net Income attributable to Navistar International Corporation (NIC)

Diluted earnings per share ($'s) attributable to NIC

$12.31

Weighted average shares outstanding: diluted

(millions)

*Includes: non-controlling interest in net income of subsidiaries

Original Target

@

414.5k Industry

Revised Target

@

350k Industry

$ 1,780

(590)

~ 72.5

$892

~ 72.5

(500)

1,100

(275)

$825

$11.46

1,190

Manufacturing Segment Profit is not in accordance with, or an alternative for, U.S. generally accepted accounting principles (GAAP). The non-GAAP financial information presented herein should

be considered supplemental to, and not as a substitute for, or superior to, financial measures calculated in accordance with GAAP.  However, we believe that non-GAAP reporting, giving effect to

the adjustments shown in the reconciliation above, provides meaningful information and therefore we use it to supplement our GAAP reporting by identifying items that may not be related to the

core manufacturing business.  Management often uses this information to assess and measure the performance of our operating segments. We have chosen to provide this supplemental

information to investors, analysts and other interested parties to enable them to perform additional analyses of operating results, to illustrate the results of operations giving effect to the non-GAAP

adjustments shown in the above reconciliations and to provide an additional measure of performance.