http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=8037606955 i was wondering if these would fix the 7.5 rear end that i have in my regal...in the description it says that they are from a posi unit, is there a difference between regular and posi gears? thx.
Same gear set. Looks like you are installing a 350 in your Regal. The 7.5" will not last with that engine. If I were you and you plan on keeping the Regal. Get a 71-2 Cutlass/Skylark 8.5" rear and buy the kit from Summit to install it in your Regal. While you are at it, get a posi unit.
how much do u think i could find the rear from one of those for? do u have a link to this kit, idk what im really looking for.
The 8.5" rears go for $50-100. The custom kit is $200-250. I don't seem them listed in Jegs or Summit catalog at this time but they did carry them. You will have to call and ask.
3 potential problems have to be addressed to propperly fit a '65-72 GM A-body rearend into a '78-80 A-body or '81+ G body. 1st is rearend width. The '78+ A/G rearends are 52.75" wide (backing plate to backing plate). The '71-72 8.5 A-body rear & '69-72 12 bolt rears are 55.25" wide (bp to bp). '65-68 12 bolts are 54.25" wide (bp to bp). By doing such a swap, one is moving the tire & wheel combo out either 3/4" or 1.25" per side. When swapping in either stock width early r/e, tire/wheel clearance @ the outer wheel house lip has to be taken into consideration. Having built dozens of bolt-in axle 8.5 A-body & a few 12 bolt rears for this application, I've yet to run into tire rub when car was running stock wheels & slightly larger than stock size tires. It's when customer already had the wheelhouse "stuffed full", that rear wheels had to be changed to ones with less positive offset. -Upper control arm geometry, spring & shock location. Kits like the near $300 Southside Machine swap kit, have been offered to swap the earlier r/e's into '78+ A/G models. One can do a propper fit swap w/o such a kit, by buying or fabbing ones own slightly canted boxed upper control arms, or by purchasing double adjustable uppers like the following: http://cgi.ebay.com/ebaymotors/G-Bo...33583QQitemZ8036844822QQrdZ1QQsspagenameZWDVW One will also need to carefully remove the front hung coil spring locators off the '67-72 A-body rear, & radius the sides of these brackets, then measure & carefully weld them to top of axle tubes. W/o doing so, the rear springs will be sitting at an angle. Stock '78+ A/G body r/e shock mounting is canted. This puts the end of the shock mtg stud dangerously near the section width of really wide tires. 9 times out of 10, @ customers request, I have just left the stock A-body shock perchs as they are, this actually moves the lwr portion of the shock slightly away from wide tires. -Brake hardware attachment. If staying rear drums, one will need to use the backing plate from the earlier style r/e. I always throw nice rustfree backing plates in for free on typical A/G swap deal. Need more info, feel free & drop me an e-mail: resto_services@yahoo.com :3gears: Roger
Well, I guess Roger covered this from front to back, top to bottom, backwards and forwards! Sheesh, I don't stand a chance! Way to go Roger! :TU: Roger, when you get a chance, email me direct at GStage1@buickperformance.com and I would like to post an article on our site about this swap. I have been asked this many times, unfortunately after the 7.5" came apart in many pieces! ou:
plz send more info to hafner@hamilton.net. now, to do this w/o a kit, how much fabrication is involved bc i have little experience in custom fabrication...do u happen to have a link to the southside machining kit just for s&g's? thx edit: i just found something http://www.maliburacing.com/ssm_instructions.html what do you think of this, thx.
Gn Rear for sale I can built you a GN rear and that will bolt right in only mod you need to do is shorten the drive shaft. Email me for a price just remember these are High price rears. ... Sorry. Jim
