It's really not complicated at all. There are two types of full time pensions:
1.) Defined benefit.
You get an accrual amount based on the year you worked. During the life of this contract it's $175.
If you go through and add up the accrual amounts for the years you worked you will receive that monthly when you retire. For example, years 93-97 it was 135. 1998-2003 it was 160. (I'm just making these up but you can look back thru contracts and get the actual figures. $175 is the actual figure for this contract. Older contracts it wasn't a flat amount it increased yearly) Add all those up 130+160+175+xxx for all the years you worked .Lets just say it comes to $5700. Then UPS will look at your age, are you at normal retirement age? (which is a different number depending on when you started, mine is age 62 not 65) If yes you get the full amount. If no then follow the formula listed in the attachments I uploaded. It's [1-((a)* .005))] where (a) is the number of months before your normal retirement age. Example you retire 12 months early, It's 1 -(12*.005), 1-.06, .94 Multiply that by $5700 you get $5358. That's your penalty.
2) Years of service pension.
You work X number of years you get X amount of money. There is an exception for people with 20-25 years and ages 50-57. Once you reach 30 years you will receive $3800 per month +100/yr of service after that REGARDLESS OF THE AGE OF THE RETIRING EMPLOYEE. At 35 years it's $4300 per month/regardless of age but no extra for going past 35 years. THERE IS NO 6% REDUCTION IN THIS TYPE OF PENSION. Hence the name it's commonly referred to as 30 and out, 35 and out. I attached a screen shot of the language from the Atlantic Area Supplement.
Starting with this contract you can combine pt and full time years to qualify for a years of service pension. However, you have to divide the actual ft years by the combined years 28/32 = 0.875 Thats the prorated amount (penalty if you will) that you will receive for combining the years of service. S0 32 years is 4000 * 0.875 =3500. Once again there isn't a 6% reduction in any service pension because as it states it's payable at any age (unless your 50-57 and have 20-25 years, and thats clearly covered) after you have 30 years or more. UPS will run both scenarios and determine the amounts your eligible for, compare the two amounts and you will receive the higher of the two amounts.
Now there will be different checks, from pt plan/central states/UPS after age 65 and all from UPS before 65. Don't let that confuse you. UPS will also make up the difference if CS doesn't pay their share. (which they won't, it just a matter of time till they're bankrupt) It's my guess that UPS offer you a buyout of the CS portion to reduce they're liability and get it off there books. But as each year passes and people retire they're exposure to the CS liability becomes less and less.