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11-25-2011 #1
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Unsolved Mystery...Pinion Nut size
Ok, I'm baffled! I bought a new pinion yoke and it came with a new nut. The nut that came off the pinion was 7/8" and was removed with a 1-1/4" socket.
I went to install the new nut and its the right thread but too big for the 1-1/4" socket. I went up to 1-5/16" and there was slop. Tried 32mm and too small....tired 33mm and again some slop.
What size is this thing???? I'm so confused!
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11-25-2011 #2
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My dorman replacement nut is slightly too big for 1-1/4" too...I don't get it
This nut measures at 1.285"...I need a 32.5mm socket???
Last edited by badazz81z28; 11-25-2011 at 06:26 PM. Reason: Add pictures
11-26-2011 #3
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I'm assuming that this is for the 8.5 10 bolt. Go to GM and get a new nut from them. They still produce these rear ends for the 1500 trucks, so the nuts are still available from them. The cheaper installation kits and auto parts stores use a cheaper nut, probably from China. If you ever have to get an installation kit get a good one from DTS, Tom's Differentials or Randy's Ring & Pinion. Don't use Ratech stuff.
'69 RS/SS396 pro street/427/4spd/9"
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11-26-2011 #4
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Thanks, do you know the part #? I'm assuming it will be for a 8.6 10 bolt?
11-26-2011 #5
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I bought one from DTS, probably going to cancel my order and buy from Drivetrain america...
Whats up with DTS $5.00 handing charge?!?!? A $3.00 nut turned into $20!
12-01-2011 #6
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That's why you should have just gone down to your local Chevy store...
Originally Posted by badazz81z28
Andrew1970 GTO Version 3.0
1967 Cougar build
GM High-Tech Performance feature
My YouTube Channel Please Subscribe!
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Please get in touch if I can be of service.
"You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her
12-01-2011 #7
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Yeah right.....GM dealer wanted $28!
12-02-2011 #8
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GM nut is pn-88891763 . ( $5.09 retail ) .
Just drive by a dealer and pick one up ..
The original 1979 pn was 1260823 ,
that change to pn - 9783762 ,
which changed to pn- 88891763Last edited by JEFFTATE; 12-02-2011 at 06:05 AM.
Jeff Tate
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12-02-2011 #9
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..or how about this? Originally Posted by JEFFTATE
1970 RS/SS350 139K on the clock:
89 TPI motor w/ 1pc rear seal coupled to a Viper T56 via Mcleod's modular bellhousing w/ hydraulic T/O bearing from the Viper, 12 bolt rear w/ 3.73 gearing, SC&C upper control arms, factory lowers with Delalums, C5 brakes at all four corners, Front Wheels 17x8's with Sumi 255/40/17 and Rear Wheels 17x9's with Sumi 275/40/17.
Brief description of the work done so far can be found here: http://www.nastyz28.com/forum/showthread.php?t=112454
12-02-2011 #10
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GM Parts Direct charges an order processing fee of around ( $9 ?? ) , plus a lot for freight ..
Plus , on this item , their minimum buy is a quantity of 5 ..Last edited by JEFFTATE; 12-02-2011 at 11:05 AM.
Jeff Tate
U.S.A.
"The best thing about participating in these events is that you get to hang out with a group of intelligent like minded people who live to achieve things in their lives. You won't find a lazy, mean, or dumb bone in their bodies." Bret Voelkel, RideTech
12-02-2011 #11
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Well, that is good to know....dang shame they turn a $2 part into something expensive. Originally Posted by JEFFTATE
1970 RS/SS350 139K on the clock:
89 TPI motor w/ 1pc rear seal coupled to a Viper T56 via Mcleod's modular bellhousing w/ hydraulic T/O bearing from the Viper, 12 bolt rear w/ 3.73 gearing, SC&C upper control arms, factory lowers with Delalums, C5 brakes at all four corners, Front Wheels 17x8's with Sumi 255/40/17 and Rear Wheels 17x9's with Sumi 275/40/17.
Brief description of the work done so far can be found here: http://www.nastyz28.com/forum/showthread.php?t=112454
12-02-2011 #12
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I am sorry, some parts just need to be sourced locally. If one dealer doesn't give you a good price, call around. I fail to see how any dealer can possibly ask $20 for a part that has a list price of just over 5 bucks. Either the part was not looked up properly, or the dealer was quoting a price for 5 nuts.
Andrew1970 GTO Version 3.0
1967 Cougar build
GM High-Tech Performance feature
My YouTube Channel Please Subscribe!
Instagram @dr__efi
I deliver what EFI promises.
Remote Holley EFI tuning.
Please get in touch if I can be of service.
"You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her
12-02-2011 #13
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have a Northern Tool store near you?
$14 socket and use the nut that you have?
http://www.northerntool.com/shop/too...1536_2003915361970 RS/SS350 139K on the clock:
89 TPI motor w/ 1pc rear seal coupled to a Viper T56 via Mcleod's modular bellhousing w/ hydraulic T/O bearing from the Viper, 12 bolt rear w/ 3.73 gearing, SC&C upper control arms, factory lowers with Delalums, C5 brakes at all four corners, Front Wheels 17x8's with Sumi 255/40/17 and Rear Wheels 17x9's with Sumi 275/40/17.
Brief description of the work done so far can be found here: http://www.nastyz28.com/forum/showthread.php?t=112454
12-02-2011 #14
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its a mystery
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