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Rebuilt SM420 Novak #1212900 Thu Apr 13 2017 05:51 AM
Joined: May 2005
Posts: 221
S
Suburban Lou Offline OP
Shop Shark
Hello all, just finished installing my rebuilt SM420 using Novak kit.
Everything went well, but I have a few issues
Before connecting the driveshaft, I have her a start to make sure everything was smooth. In neutral, I see the u-joint connector on the back of the tranny spinning a little. Clutch feels great, smooth shift all gears
But when I put in reverse, the u-joint connector rotates the same direction as 1st and 2nd
Also, when I did connect the u-joint, and in neutral, it act like it's in gear and I cannot push the truck
I did install new shift bushing and I think I read that the problem may be in the tranny cover with the rods not being aligned. I plan to call Novak tomorrow, but if anyone has advice before that it's much appreciated


1949 Chevrolet 3100 Suburban Carryall
"Bad Guy"
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1950 Chevrolet 3100 3-Window
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1966 GMC Suburban Carryall Custom
"Big Guy"
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Re: Rebuilt SM420 Novak [Re: Suburban Lou] #1212905 Thu Apr 13 2017 07:09 AM
Joined: Dec 2015
Posts: 2,063
69Cuda Offline
Big Bolt Forum Moderator
I would pull the bolts out of the top cover and see if you can lift it a tad and see if the shift forks are where they need to be. It sounds like something is not lines up properly.

with the top off, you should be able to make sure it is in neutral and spin the rear yoke by hand.


Mike

1955 Chevy 6400 ex-flatbed (no bed now!)
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1958 Chevy 6400 flatbed W/dump
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1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
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Sufficient unto the day is the evil thereof
Re: Rebuilt SM420 Novak [Re: Suburban Lou] #1213320 Sun Apr 16 2017 05:57 AM
Joined: Apr 2002
Posts: 1,574
F
Fox Offline
Shop Shark
Lou,
I have a similar problem with my 420 where it rotates in neutral at the output shaft. My sneaking suspicion at the moment is the pilot bearing is egged from my installation. It was a bear to push into the crank and I think it's pinched. I'm going to pull the bearing and the 420 and try an old spare to see if it is the culprit. But for now I'm still sanding, sanding , sanding!


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1951 GMC 9430 1 ton dually—-Shiny!

1970 Chevrolet C10 - Grandpa’s- My first truck.—in progress to shiny
1972 Chevrolet C20- rusted
1970 Chevrolet K20 Suburban—rusted.
1950 Chevrolet 1300- in progress to shiny.

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1951 GMC 9300
1951-GMC 9430
1951- Chevrolet 1300
Re: Rebuilt SM420 Novak [Re: Suburban Lou] #1213354 Sun Apr 16 2017 01:44 PM
Joined: Jun 2011
Posts: 3,117
E
EdPruss Offline
Shop Shark
Pilot bushings are cheap, way less than the grief caused by improper installation, check it upon first trans. Installation when it is easy to replace. Do a test fitting with a spare input shaft.

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.
Re: Rebuilt SM420 Novak [Re: Suburban Lou] #1213477 Mon Apr 17 2017 04:52 AM
Joined: May 2005
Posts: 221
S
Suburban Lou Offline OP
Shop Shark
Got it up and running today
Wrestled with the cover and smashed my finger by the shift did
Drove around for a bit
Very smooth and well worth the clutch and rebuild


1949 Chevrolet 3100 Suburban Carryall
"Bad Guy"
In the Stovebolt Gallery
More pix in Photobucket

1950 Chevrolet 3100 3-Window
In the Stovebolt Gallery
More pix on Photobucket

1966 GMC Suburban Carryall Custom
"Big Guy"
In the Stovebolt Gallery
More pix on Photobucket
Re: Rebuilt SM420 Novak [Re: Suburban Lou] #1214017 Thu Apr 20 2017 11:20 PM
Joined: Dec 2006
Posts: 1,154
W
WHO, ME ? Offline
Shop Shark
I've had my Novak sm420 for over a year it's great. Had the rear end changed to 3:38 new u- joints and drive shaft and clutch assembly. Couldn't be happier Novak is a great company and nice people.
Steve


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