According to Guide to Buick Gran Sport, Vol 1, page 30 (1968 rear axle chart): model 44437-39-67-69 >350v8>engine code PP (2spd auto 4bbl)> code ME trans> Standard ratio 2.73 code LL(open) or code LO(lim slip); economy ratio 2.56 code LK(open) or code LT(positract); performance ratio 3.23 code LC(open) or code LP (positrac); Trailer option ratio 3.91* code OZ (positrac only) * not available with air conditioning 444 is skylark custom v8; 37, 39, 67, &69 are the body styles
Be careful. There are no readily available parts for the 68-70 Buick 8.2 10 bolt. Monzaz may be able to help you. A while back they had a run of gears made for that rear. You cannot order a Posi out of the Jegs catalog. Don't mistake the 64-67 Buick 8.2 rear for your rear. They are different.
Any concerns or knowledge about the one that SUMMIT offers, in there Catalog part number ETN-19674-010. will that fit the 68, 10 bolt 8.2 ?
See, that is exactly what I am talking about. That posi will only fit the 64-67 Buick 8.2 10 bolt. THE 68-70 BUICK 8.2 is different. http://www.summitracing.com/parts/ETN-19674-010/Application/?prefilter=1
TA performance has a posi rear end kit for 68-70 8.2 10 bolts but it won't let me post the link for some reason taperformance.com/products.asp?cat=459
I was under the impression that Posi units were not available for that application. However, according to 68customs link... it seems that I am mistaken. Thanks for the link.
We have posi unit for the 1968-1970 10 bolt 8.2 Buick Skylark and LeSabre with the same 8.2 center section. Posi unit are Modified Auburn units. We Modify them to fit your 8.2 10 bolt...There is nothing on the actual market that will fit with out modification...Too short run of a rear and the larger driver side carrier bearing is where the trouble lies with this posi. Gears - we have 3.64 ring and pinion in stock and are waiting for the 3.42 (30 set run) From BRad at Fabcraft Metalworks who reverse engineers the gears. They do many Muscle car ring and pinions that are obsolete. I helped brad with all the parts and Ideas of what parts we should use so that it would be as Customer friendly and posi product friendly as possible. We made the 3.64 gear set thick to fit the Auburn carrier that is on the market that can be modified with machine work. If you want to use the 3.64 gear on the ORIGINAL 4 series carrier we can machine it to fit that carrier also. 3.42 fits the stock 3 series carrier and aftermarket carrier We have Posi units that will also fit the 2.56 2.73 2.93 ratio also. The stock 3.23 3.42 GM ratios fit the aftermarket Auburn modified carrier Just PM and we can discuss if you like Jim J D
You are both mistaken. Monzaz has the only kits that will work. Look at his post above. He modifies the Auburn units to fit. He also has gear sets. You will probably get your best price from him. There are no Posis on the market that will fit without modification. The 64-67 Buick 8.2 is not the same as the 68-70 Buick 8.2.
Based on the prices, it looks like TA is also offering the recently tooled 3.42:1 and 3.64:1 gearsets for these. Do you know for a fact that they aren't making the same mods to the aftermarket carrier to make it work as well? They are very specific in describing the exact application in the catalog. Devon
No, I don't know for sure. I haven't had a current TA Catalog in awhile. One thing is for sure, their website doesn't help. If TA is offering a direct fit posi, it must be modified also, and that is great. I just want to make sure that these guys realize that they can't order a posi out of the Jegs or Summit catalogs, and that what those catalogs describe as a BOP 8.2 is not the same as the 68-70 Buick rear. We recently had someone make that mistake, and he was pretty pissed when the shop doing his rear called and said it wouldn't work.
I've included a link the TA Performance page for posi rear end below. Please have a look to see that would do it. It lists a 8.2" carrier for '68-'70, an installation kit, and a choice of 3.42 or 3.64 gear sets. I have a vested interest in the outcome since I have a '68 GS400 with an 8.2" 10 bolt and upgrading to a posi with higher gears is on my to-do list. Note: I don't have enough posts on the site to allow me to include links in my reply, so I've embedded the link in the attached text file. You'll have to open the text attached and the link is in there. Eric.
Since I'm a GM 10 and 12 bolt hater, how much stronger is the later 8.5 10 bolt compared to the 67-70 8.2? I was thinking of going 9" in my GS, but I doubt I will spend the money on that until I actually have a drivable car. ray:
From what I have read, the 8.5 10 bolt that came in the 71-72 Buicks and Oldsmobiles is a very sturdy rear capable of handling the power of a 10 second car if built right. In stock form, that rear will likely stand up to anything you throw at it, especially on the street. It has the same pinion shaft diameter, and pinion support as a 12 bolt, but unlike the 12 bolt, it uses bolt in axles, so no C clip eliminators, leaks, or worries. I use a 1971 8.5 10 bolt, and I upgraded it with 30 spline Moser axles, and matching Eaton Posi. Parts availability is excellent. IMHO, it is a much better and cheaper alternative to a 9" Ford, and I think Monzaz will tell you that also.
