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SM420 side bolt question
#1562249 11/01/2024 7:19 PM
Joined: Mar 2018
Posts: 139
Idaho Springs, CO
S
Snowman51
Offline
'Bolter
Snowman51
'Bolter
S Offline
Joined: Mar 2018
Posts: 139
Idaho Springs, CO
Im trying to find the bolt size for the right side ( transmission is in the truck) of the two cast “nipples” on the transmission case. I guess they were used to mount a hand brake(?) from what I’ve seen. Any help?
Re: SM420 side bolt question
Snowman51 #1562250 11/01/2024 7:22 PM
Joined: Mar 2018
Posts: 139
Idaho Springs, CO
S
Snowman51
Offline
'Bolter
Snowman51
'Bolter
S Offline
Joined: Mar 2018
Posts: 139
Idaho Springs, CO
It’s a 1964 sm420.
Re: SM420 side bolt question
Snowman51 #1562262 11/01/2024 8:54 PM
Joined: Sep 2009
Posts: 5,823
Grandview, Missouri
Gdads51 Offline
Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT
Gdads51
Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT
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Joined: Sep 2009
Posts: 5,823
Grandview, Missouri
I did a bit of searching through my reference books. Assuming you have the band style parking brake, the 2 bolts that are used to mount the U-shaped brake handle bracket to the body of the SM420 should be 3/8 - 16 x 7/8" and also uses 3/8" split style lock washers. My resources show the same info for 1958-62 SM420's and I think that will carry over to your 1964 model as well.
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~ Dan
1951 Chevy 3 window 3100
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Re: SM420 side bolt question
Snowman51 #1562275 11/01/2024 10:44 PM
Joined: Mar 2018
Posts: 139
Idaho Springs, CO
S
Snowman51
Offline
'Bolter
Snowman51
'Bolter
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Joined: Mar 2018
Posts: 139
Idaho Springs, CO
Thanks. A quick ream out and that bolt went in like a champ!
Re: SM420 side bolt question
Snowman51 #1562290 11/02/2024 2:40 AM
Joined: Jun 2011
Posts: 5,096
Longmont, CO
E
EdPruss Offline
Crusing in the Passing Lane
EdPruss
Crusing in the Passing Lane
E Offline
Joined: Jun 2011
Posts: 5,096
Longmont, CO
Almost all bolts in a Stovebolt engine are NC when threaded into CI. If threaded into steel are NF.

Ed

'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.

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