7.25 to 8.25 Swap Questions

prican_2000 said

I'm in for more information on this as I am also thinking (or have the opportunity) of picking up a 8 1/4.

so question: would the driveshaft from the car that the 8 1/4 rear end come from make it pretty much a plug n play deal? with just having to buy the new plates and u-bolts?

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My understanding is that so long as the 8 1/4 you install came from another A-Body and the your transmission tail length is the same as the donor car, you can use the driveshaft from the donor. If the transmissions are both 904's there won't be an issue, but if I'm not mistaken (which I could be), if the transmissions are 727's or manuals, or completely different from each other, you'll have a mish-mash of different trans-lengths and you'll have to shorten your driveshaft anyway.