Bolt Size Help... 1992 Chevy K1500, 350, 700R4, NP241C

Started by TBigLug, January 13, 2012, 02:15:43 AM

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TBigLug

January 13, 2012, 02:15:43 AM
Had some bolts that loosened up and fell out of my new truck. Can anyone who has an NP241C (it's in a 1992 Chevy K1500) out give me the size of the bolts that hold the front driveshaft on the transfercase and the four bolts that hold the adapter to the back of the tranny (700R4). All four fell out of the front driveshaft somewhere along the line and three of the others backed out and one is gone.

Thanks.
Big John's the name, big horses are my game!

"Casper" 2004 Chevy Cavalier, 2.2, 5 sp. (g/f dd)
"The Hoopty" 1995 Mercury Grand marquis, 4.6L (my DD)
"My Chevy" 1992 Chevy Z71, 5.7L, 700R4 (Horse Hauler, Farm Truck, Cruiser)

"I'll keep my God, freedoms, constitution and my guns. Obama, you keep your change!" -Protesters Sign

"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government."  -- George Washington

gator82

#1
January 13, 2012, 02:22:51 AM
Call Autozone, they might be able to look it up and give you an idea of what size to start with.

Kyle

#2
January 13, 2012, 02:29:34 AM
had that happen to me... but i never did actually look for the size, just took the remaining one i had to compare to... i think it might be a 3/8s course thread tho...
92 chevy stepside - built 408 sbc/modified 700r4/14 bolt ff/dana 60/4.56s/38.5s/western 7.5' plow

==rf Gotta Get Dirty! Nothin' Else Matters! ==djdj

TBigLug

#3
January 13, 2012, 03:10:56 AM
They are Metric on mine. The transfer case/tranny bolts are 15mm headed. I guess I could take one out but then I'd have to drive the truck to the hardware with only two left. lol, can't win for losing with that. Driveshaft bolts are all gone so I don't even have one to take up. Worst part is I junked a truck last year that woulda had all the bolts I needed! loll
Big John's the name, big horses are my game!

"Casper" 2004 Chevy Cavalier, 2.2, 5 sp. (g/f dd)
"The Hoopty" 1995 Mercury Grand marquis, 4.6L (my DD)
"My Chevy" 1992 Chevy Z71, 5.7L, 700R4 (Horse Hauler, Farm Truck, Cruiser)

"I'll keep my God, freedoms, constitution and my guns. Obama, you keep your change!" -Protesters Sign

"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government."  -- George Washington

Captn. J

#4
January 13, 2012, 04:23:22 AM
on older the head is 5/8  and coarse tread.. but if u re saying yrs is a metric then i cant help ya cuz i dont know
forddgal  forddd  forddgal


'81 F250
'03 F150

OHEARN.2012

#5
January 13, 2012, 06:01:54 AM
just go to a junk yard..
RBS Racing

i bog my bogger not my daily driver

built tough with chevy stuff

Listen Here Boy....I was slinging' mud before you were swimmin' round in your daddy's Nu* sack. Yankee Lake Trucks Gone Wild 2011

Eroq

#6
January 20, 2012, 05:00:12 AM
I wanna. Say they're M10x1.5.    3/8-16 will start to thread in but will stop very soon.    Driveshaft might be M12x1.75. They're usually a fine thread.  Larger bolt...  grab a handfull of bolts from the hardware store. 

paul

#7
January 20, 2012, 05:05:39 AM
just do what ohearn said and go to junk yard and find the same truck and take out of that eliminats the guessing prob. thats what i had to do with my 83 s-10 3 or 4 of the bell housing bolts fell out at some point. didnt feel like guessing on new ones
respect the buickk

TBigLug

#8
January 20, 2012, 02:21:57 PM
Quote from: Eroq on January 20, 2012, 05:00:12 AM
I wanna. Say they're M10x1.5.    3/8-16 will start to thread in but will stop very soon.

You were right on about that one. The driveshaft did end up being standard 7/16x???. Or at least close enough for them to work.

Thanks for the help everybody.
Big John's the name, big horses are my game!

"Casper" 2004 Chevy Cavalier, 2.2, 5 sp. (g/f dd)
"The Hoopty" 1995 Mercury Grand marquis, 4.6L (my DD)
"My Chevy" 1992 Chevy Z71, 5.7L, 700R4 (Horse Hauler, Farm Truck, Cruiser)

"I'll keep my God, freedoms, constitution and my guns. Obama, you keep your change!" -Protesters Sign

"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government."  -- George Washington
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