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Gear pinion help
#1417944 Sat Jul 24 2021 03:59 AM
Joined: Feb 2020
Posts: 5
J
'Bolter
Hello...1950 3100...I am trying to removal the axles and 3rd member but I have ran into a problem. The lock screw that holds in the pinion shaft is a round flat head screw. Everything I have read says it should be a square nut. No problem except I cannot get it out for anything..I am afraid I am going to strip it and be in a real mess. Is this original or perhaps someone has been in this axle before? Any suggestions on getting this out? Thinking of grinding two sides flat and putting vice grips on it but really do not want to do grinding around these type of parts. I don't have any real good way of heating it up either. I looked in the manual and I did not even see a torque tube style depicted?? Sorry should have taken a picture.. I will tomorrow if need be...attached is what it says it should be.
Thanks
Jason

Attached Files
RearAxle0004lg.jpg (46.84 KB, 105 downloads)
Re: Gear pinion help
jasrking #1417962 Sat Jul 24 2021 12:41 PM
Joined: Feb 2000
Posts: 4,365
J
'Bolter

Re: Gear pinion help
jasrking #1417965 Sat Jul 24 2021 01:01 PM
Joined: Sep 2010
Posts: 981
K
'Bolter
Someone put a different screw in there they may have also put some lock tite also ,use a little heat to loosen the lock tite just in case


kevinski 1954 GMC 9300 Welcome to the virtual Garage [stovebolt.com]
Re: Gear pinion help
Joe H #1417968 Sat Jul 24 2021 01:42 PM
Joined: Feb 2020
Posts: 51
S
'Bolter


+1 on the impact screwdriver! I got one of these long ago and have used it A LOT more than I ever thought I would. Definitely in the top 5 of my most useful tools.

If you need any parts, I have the internals from my 47 rear end (4.11) that you can have.

Last edited by stlcardinalsguy; Sat Jul 24 2021 01:46 PM.

Mason

1947 Chevy 3100
-57 Chevy 235
-93 S10 T5 Transmission
-97 Blazer 3.42 Rear End
Re: Gear pinion help
jasrking #1417969 Sat Jul 24 2021 01:44 PM
Joined: Mar 2014
Posts: 2,481
J
'Bolter
It should be a typical nut head and it is very much a specialty screw...long, polished past the threaded part and unique. The one in mine is a hex head nut, for what it is worth. I'd guess somebody didn't have that screw, went to the hardware store and got something that sort of fit and as kevinski said added some loctite. Or possibly epoxy. Hard to say. You may have to drill a hole in it and use a screw extractor. Or as you said, grind or file two sides flat and use vise grips. If you have to do that, just place shop rags around and catch any filings. Good luck!


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Gear pinion help
jasrking #1417978 Sat Jul 24 2021 03:15 PM
Joined: Apr 2005
Posts: 2,841
C
'Bolter
First try heat. Heat very hot and then let cool to give the heat time to migrate rather than just to the screw head. Heat a second time and try impact driver. Be careful as the "annealed" screw will strip out the slot easily. You may also try TWO ball pein hammers to break loose; one held with the flat face on the screw head and the second to whack the first.


Evan
Re: Gear pinion help
jasrking #1417999 Sat Jul 24 2021 06:31 PM
Joined: Jan 2001
Posts: 5,135
P
'Bolter
Slotted head bolts were standard on early models.
I have been able to remove stubborn bolts with a small vice-grip.


See the USA in your vintage Chevrolet!
My Blog
Re: Gear pinion help
jasrking #1418008 Sat Jul 24 2021 08:41 PM
Joined: Feb 2020
Posts: 5
J
'Bolter
Here is a pic...how would I know if someone changed the gear ratio before? Thanks for all the advice and offer on parts..very much appreciated..I was really just trying to take off as much stuff as possible to store and make easier to clean prior to paint. I didn't realize the brake shrouds were riveted on or I would not have even cracked this nut open trying to get axles out; but since I have taken the bolts off the third member I have now forced my hand at a new gasket....debating on doing the update on the gears...I haven't tried any of the suggestions yet but will hopefully tomorrow..thanks again...Jason

Attached Files
Bolt3.jpg (136.92 KB, 54 downloads)
bolt4.jpg (227.13 KB, 53 downloads)
Re: Gear pinion help
jasrking #1418010 Sat Jul 24 2021 09:23 PM
Joined: Sep 2010
Posts: 981
K
'Bolter
You could count the teeth to see what the ratio is ,it should also be stamped on the ring gear itself.


kevinski 1954 GMC 9300 Welcome to the virtual Garage [stovebolt.com]

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