(This is nothing Official!  Just approximate Take Home Pay I was computing).
Buyouts & Bonus edit:
Approximate Take Home Pay after Lots of Taxes! July 25th, 2006
35k Bonus for Normal & Early Voluntary Retirement Only   Taxes for Lump Sums:  
  (Mutuals Don't Get This) Federal Flat Rate = 25%
35k @ 35.99%  tax (-$12,596)  = $22,403 (approx. take home)   FICA - HI = 1.45%
FICA - OASDI = 6.20%
                32.65%
50k Buydown (if it's offered)   Plus State Tax:
50k @ 36.52%  tax (-$18,260)  = $31,740 (approx. take home)   Ohio (for $140k) approx 5.64%
Ohio (for $70k) approx 4.31%
Ohio (for $50k) approx 3.87%
70K Buyout  (3 but less than 10 years Seniority)   Ohio (for $35k) approx 3.34%
70k @ 36.96%  tax (-$25,872) = $44,128 (approx. take home)      
(City/Local Tax varies) ?%
                For reference:
$140k Buyout  (10 or more years Seniority) Warren City 2%
$140k @ 38.29% tax (-$53,606) = $86,394 (approx. take home) Lordstown   1%
             
Buyouts for those with 5+ years of Service, Severs all ties except:
Vested Pension = Basic Benefits when retirement age (age 55 and up)
   
No Medical or Life Insurance benefits For your own Vested Service
  and Basic Benefits, call  
Vested Pension (5+ years of Service) = Basic Benefit Pension Only Fidelity Benefit Center:
  Gross Monthly Approximates: 1-877-389-2374  
If Collect at:     http://www.yourdelphibenefits.com
Age: % 88's (A) 85's (A) 93's (A) 94's (A)  
55 42.8% $392 $457 $283 $261  
56 46.8% $428 $500 $309 $285   Credited years do go by tenths,
57 51.2% $469 $547 $338 $312   so if yours is '18.4' years, multiply
58 55.5% $508 $593 $367 $339   the '$50.90' (Basic Benefit)
59 59.6% $546 $637 $394 $364   by '18.4'    
60 64% $586 $684 $423 $390  
61 71.2% $652 $761 $471 $434  
62 78.4% $718 $838 $518 $478  
63 85.6% $784 $915 $566 $522   Percentages from Pg 62-64 of the
64 92.8% $850 $992 $614 $566   2003 Pension Plan Agreement Book
65 100% $916 $1069 $661 $610  
Base Hourly Rate from 9/18/06 onwards:   Basic Benefit  10/1/06 & after:
A - Less than $26.93  (Short Order 392's) equals= A = $50.90  (Short Order 392's)
B - $26.93 but less than $27.22 equals= B = $51.15   Pg 6 & 80 of red 2003
C - $27.22 but less than $28.42 equals= C = $51.40   Pension Plan Book
D - $28.42 & over     equals= D = $51.65  
Base Hourly Rate 9/19/05 to 9/18/06:   Basic Benefit 10/1/05 thru 9/1/06:  
A - Less than $26.15  (Short Order is $25.96) equals= A = $49.85  (Short Order 392's)  
B - $26.25 but less than $26.43 equals= B = $50.10    
C - $26.43 but less than $27.59 equals= C = $50.35    
D - $27.59 & over     equals= D = $50.60    
Ohio Tax - 2006 Witholding Plus of Excess Over:        
$0-$5,000   $0 0.774% $0         of Excess
$5,000-$10,000 $38.70 1.547% $5,000 Ohio Tax Witholding Plus Over:
$10,000-$15,000 $116.05 3.094% $10,000 $40,000-$80,000 $1,392.55 5.416% $40,000
$15,000-$20,000 $270.75 3.868% $15,000 $80,000-$100,000 $3,558.95 6.189% $80,000
$20,000-$40,000 $464.15 4.642% $20,000 $100,000 and over $4,796.75 7.736% $100,000
This is just a possible scenario type personal worksheet I made, it's nothing official!
http://diversityj.com/DelphiGM