Ok i broke the passenger side rear axle this past sunday at the drag strip. :ball: What i have is a 8.5 bolt in type 28 spline axle. The car is a 70 GS stage 1 with a built 455 1.51 60 FT times. Does moser or strange make a 28 spline axle that will hold up and does anybody know the part# for the axles. Thanks Billy.
Billy, 1.51...you were definately scootin :Brow: What does your GS weigh? High 1.50's (a 1.56) in a friends 3700 lb '66 LeMans is as quick as I've seen the stock '71-72 8.5 axles go with slicks... you were def at the edge. On performance replacement axles, I've ordered quite a few from Moser over the years. They don't have a part number per say, for the '71-72 A-body axle. One has to give them dimensions. Make sure & specify whether the '71-72 8.5 A-body axle you're running has the A9 or A10 axle bearing. Lastly, if you're running a shimmed up S spring posi, you're at its limit. Good time to consider selling off the S spring posi, going to a 30 spline HD Eaton carrier, with new 30 spline Moser axles. Good luck! :3gears: Roger
As usual Roger great information! Billy where did the axle break? Are you still running the standard 3" drive shaft? Just wondering which is the weaker link (drive shaft or 28 spline axles).
My "luck" I ran 28 spline stock axles with 1.51-1.53 60fts. I checked them every couple of trips to the track. Only had to replace one that started to twist at the splines. Stock driveshaft too. Wouldn't recommend it. I broke one driveshaft coming out of the burnout box and it took my tranny out with it. Good thing I had a spare stock driveshaft and spare tranny parts for a cheep fix at the time. The second driveshaft lasted 2 years until I changed the combination. Car weighed 3550 at the time.
Custom alloy axles. My car weight is 3940 lbs with me in it. The axle broke off flush with the carrier right at the splines. I am thinking of going with moser premium alloy axles $315.95 a set I have the A9 axle bearings. Also it was the drivers side axle that broke, My :error: saying it was the passenger side. I may go with the eaton 30 spline set up if its not too much more $$$$$. Not sure yet i have been saving up to go to the GS nationals in bowling green. I have my reaction time down good and a new set of hoosier 29x9x15 slicks. Billy.
perhaps it is time to get rid of those darn c-clip rear ends and get a 9" or one of those new strange s-60's which is a dana 60 that is casted with the upper control arm mounts. not always the most affordable but once it is done you don't have to worry about it again for the most part. also no leaky c clip eliminators. good luck.
No c-clip axles in '71-72 8.5 A-body rears :Brow: Above stock axle breaking problems are directly related to a combination of low 60 foot time, 28 spline count, & weight of the car. For some reason, prob metalurgy, the '71-72 8.5 stock axles seem to hold up better than most previous 28 spline sealed bearing axles. In similiar weight but slower cars have seen many 28 spline 8.2 & type "O" axles fail. :3gears: Roger
axles aftermarket Moser charges the same 315 for all alxes up to 35 spline. I just order the 30 spline for a buick guy here in the area. He going to torcher them. Will see how it goes. Using the eaton 30 spline unit with 910 bearings (spool bearings.) and 3.90 gears. Good luck with your choice. If your gonna spend the money and your already at the 1.50 60 foot mark go for the upgrade now while you have everything apart. Jim
ya'll sure this is an 8.5" 10-bolt not a BOP 8.2" 10-bolt? I'm dang sure the 8.5" corporate 10-bolts all use C-clip axles while the BOP 8.2" 10-bolt and the Buick Full sized rear ends used bolt in axles. Eitherway, I'd like to see someone run one of the new S-60s under a Buick. I'm going to be putting a later B/D-body 30 spline 8.5" 10-bolt with custom brackets under my 64 Riv. If it'll live under a 10-sec Impala SS, I'm pretty sure it'll live under my 11.5-sec (I hope) Riv.
Def sure on the tapered bearing bolt-in axles, have built over 400 of the '71-72 8.5 A-body rears. Built up right, the 8.5 A-body rears can go into the high 9 sec range in a 3600 lb auto A-body. Basically same territory as heavily built 12 bolt. Quickest 1/4 I personally have customer running on an 8.5 is a '68 Nova in the 9.60's. The Nova rear has 33 spline Strange Spool & axles. When completed my '63 LeMans "streetcar" should be quickest (that I've built) with a bolt-in axle 8.5 A-body rear... target weight, wet, is 3200lbs. Everything has it's place... if the plan was low 9 sec '63 LeMans race car leaving on a transbrake at 5K, I'd spend the big bucks on custom 9" with the Mark Williams 12 bolt 3rd member. :3gears: Roger
The mini spool is on its way. Ok i have a auburn 30 spline mini spool on the way to replace my S spring posi unit. Going from 28 to 30 spline moser custom alloy axles. I should be good to go for bowling green. :TU: Billy.
Mini spool Well keep saving cause that mini spool will be junk soon with the weight of that car. I think that was not a good choice in money spent. Get the full spool and do it right. Please trust me on this or spend bigger money and get the power trax / lock right unit. Much better money spent. I am just trying to steer you in the right direction. Good luck on your decision. Jim I have a 30 spline spool here if you need for 135.00 if that helps. Probably what you spent for the mini spool. and I guarentee the full spool will last a long time 100 times longer that that mini spool. Jim
The mini spool. Well, I do not see how the mini spool will break so easy. This auburn spool looks strong. o No: The only way it will fail is if the pin breaks and hell that would have happened with my spider gear set up anyway. Has anybody ever had one that broke. :Smarty: Where do they fail or what breaks on them...... Let me know. Billy.
mini spool It will work for a while.... The blocks start to destort and create a slop creating a heavy torsen effect on the axles . Then a slap back effect on the ring and pinion... Plus the heaviness of the car will speed this process along. Those units are really made for DIRT and off road application or at the very least a light under 3000 pounder car. You can do what ever you feel you can afford or want. It is your car. I am just trying to help prevent a larger bill in the end. Like I said it will work...Do not expect it to hold up real long though and remember you have to except the consequences of the trouble you might have with it. Hope everything turns out good not matter what you choose. Jim
The preacher has spoken. Jim, Are you a preacher........ :laugh: Because you are doing some heavy preaching about that mini spool. I picked it up off ebay with an open carrier for 90 bucks. What i am looking to do is up grade from a 28 spline to a 30 and go with the custom alloy axles. Now i do have a S spring 28 spline posi in the car. Should i just get 28 spline custom alloy axles and go with that set up. Or should i jump up to the 30 spline and get another posi unit. Man this can cost some big bucks quick........... The posi unit i have now is in very good shape and i understand where you are coming from when you say the mini spool will not last long. At this point what is the best route to go...... Please preach to me some more and guide me in the right direction.... Hell now all i need is the burning bush in the corner of my room and i will see the light and maybe come back with some grey hair's........ :laugh: :laugh: :laugh: Thanks Billy.
Billy Billy, This takes time for me to email anyone back. I care enough to at least give you the info. I am not making any money off you at all. I need to know if this car does any street duty? If it does a posi and or Power trax/lockright is you best friend. If it s strictly tracker GO WITH A FULL SPOOL at least 30 spline if you have to buy new axles they will cost you the same amount anyway. Also you know, I hope that you need to use a open carrier for the mini spool . correct? So if your going to get one of those you need to get a 1989 and newer one that uses 30 spline axles. to use your 30 spline mini spool. Now do not quote me on that cause I have not checked to see if 30 spline spider gears fit into a 28 spline case Open to Open. ??? Roger?? You need to figure out what your car will be doing most of it's life while in your hands STREET OR RACE. That will help you to figure out your needs. 1.51 is a stut 60foot for a street car. Jim
