Did my burn out, staged , on the trans brake,matted the peddle. 3rd yellow lights let go of the button and BANG.Engine hit the rev limiter and she rolled about 10'. Shut down immediately thinking transmission and loosing fluid on the track. Starter guy was on his way as I climbed out of my belts. Looked under the car expecting to see a mess of wet parts, hanging drive shaft or something. All clear. Fired up. engine sounds fine. No Drive or Rev. Got towed back to my pit by a buddy. Thinking sprag broke, new trans time. Started the car put her in 1, looked under and the shaft is spinning. So now im thinking I broke the pinion or possibly the spool. Unlikely it snapped both axles. She has a Ford 9" with a ladder bar set up.
Sucks if thats true! That was a fairly new set of Moser gears. If thats the case what are my options? We had near perfect air yesterday with a DA of 800. There were plenty of cars setting new personal best times and a handful that broke because of it. I was expecting to see sub 6.50's
Heres what I found. splines on the axle shafts are twisted and stripped and the mini spool is broken. Ring and Pinion seem to be fine. I've got replacement parts but will have to do some mods before they will work. The first 3 images are the old stuff and the last 4 are the new(to me)
No such thing as too much torque. On one hand I think it sucks that you broke parts. On the other...That's really cool to twist two axle shafts.
yes sir I didnt even get bummed out about it for just that reason. Breaking hardened parts? Hell yeah!
We're the stripped axle basic stk 28 spline. I'm not a huge fan of mini spools fir drag racing, even though I did run one in my 8.5 for a few years early on with no issues. I gave seen alot of 28 spline ford axle get killed by lesser cars for sure. Customer has a 41 Plymouth with 355 running 11.80 his axles ended up looking almost the same. I know axles are on my to do list too.....been running low 11 and high 10s for a few years now on stk 8.5 axles. I'm pretty sure the new heads when all gets worked out will eat them hopefully after another bottom rebuild there is the 500 or so needed to get some 8.5 axles. Would like to go up 30 spline even though it will take a new spool
Im.just jelouis that you can be racing in Jan. So not fair.....wish someone up here would put a dragstrip under a dome or cover
Go ahead and install a back brace now, or you'll be doing this again very soon, 9in's deflect like crazy without help, narrowed or not
Not sure if those were aftermarket shafts that you stripped,but there might have been a slight mis-match with the splines of the shafts and the spines of the spool. You could have two different pitches or cut angles. They could go together,but have excessive play,and would result in something like what you pictured. Backbrace like this:
Not impressed with the 9" Ford rears, a friend broke the stock HD 31 spline axles with a sbc 383! Busted a couple sets of 31 spline gear sets as well. The thing is holding together with the Moser 41 spline axles now(about the diameter of a beer can) with the matching strange center section, spool and gears. In stock form they don't seem to be any stronger than any of the other manufacturers HD rears that I have seen. Adding power always finds the weak link.
Not real sure abou6t the spline count. I had this apart a few years ago when I went from the 5:00 gear to the 4:56 and I think I counted 31 back then. It was running the old basicly stock slightly warmed up 455 going 7.80's. with a 1.60 60' New build is going 6.40-6.60 with a 1.40 60' The new /used set up Im putting in is a full spool with Richmond gear set and 31 spline axles. We race all yr round down here. Can you imagine how loud a indoor drag strip would be? I've been to a few monster truck shows inside and it was deafening.
Mini spool? Ya, your a bit beyond that.. New setup is closer to what you need, and yes, take the time to add a back brace to that housing. For any kind of 3000 ish pound car with Buick Torque and a transbrake.. 40 spline MW stuff is the way to go. JW
Those broken axles do not appear to be race alloy axles. They look like re-splined axles. Can you get more pictures of the axles out of the housing and the register drum area? Lets get a better look at these axles. Also now your going with a stock ford case and a full spool?? That seems backwards? Alsoi what are you doing about those axles they are too long? If you cut and re-spline those axles your going to end up in the same boat. You can not re-cut axles and go though down past the hardened outer diameter... That is what the broken axles look like they were re-splined as I can see the taper down to 28 spline. These re-splines just can not handle the dump of a trans brake. You need to BUY new axles that are made correct length that are hardened for the length you need. Get that FULL spool back in the Aftermarket third member too and dump the stock case... Also , this is your car and you can do what you want. All this is my opinion from experience. But it is your ride. just trying to help keep everything together for you. Jim J D
Hi Jim, Was hoping you'd jump in here. Due to financial reasons I'm going to have to make due with what I have on hand. The axles that broke / twisted/ stripped appear to be cut down stock ford truck axles. They were in the car when I got it along with the mini spool setting in a stock ford 3rd member. Within the first yr I broke the cup that held the pinion bearing and purchased a nodular iron unit from Summit. Today I'll transfer all the guts from the stock unit to the Nodular. The "new axles" are Moser. I bought the set up from Steve Reynolds at the swap meet. They came from Jeff Harts car. I'm gonna have to try and make em work. If it turns out that its a no go then it will be new axle time. I'd like to back strap the rear. I'd have to fab something if theres not a pre made kit available.
I understand money can be an issue in lots of these builds. BUT you guys are playing with big torque motors (which cost money) So in the end you spend more money braking parts instead of waiting and getting parts that are correct and higher quality. ALL axles that are respline are only good for street use driving...NO TRACK high stall set-up they will always end up like your re-splined axles. Good luck... cross them fingers you will need it.
If he is running a full spool the axle passage should pass all the way through, would it be.possible to just cut the down so they don't hit and not respline them. Even through there is a lot of shaft overlap there it appears in the picture, if they only need to not touch, and you take equal amounts of both axles with a good chop saw, you only need to take a little over half the overlap distance off to keep rhem from contacting each other. I know cutting a shafts can be hard, have done it b4 and chop saw works better than a reciprocating saw. How much length of axle spline is needed to be safe??? Here are a couple brace kits ://www.summitracing.com/parts/sum-hnbbf9?seid=srese1&cm_mmc=pla-google-_-shopping-_-srese1-_-summit-racing&gclid=CjwKCAiA15vTBRAHEiwA7Snfc4M_Z5Vg3fQiYsvLVsSM9NLCQTGGCd9rEj7tpxFx3AMIDY9chlx8BhoCy3QQAvD_BwE ://www.summitracing.com/parts/msr-7000?seid=srese1&cm_mmc=pla-google-_-shopping-_-srese1-_-moser-engineering&gclid=CjwKCAiA15vTBRAHEiwA7Snfc6odRVgcIwF529ykzxcUfTGGpX2uhnjg2Asuc3OpEu06umSVDVCYBBoCqxgQAvD_BwE
