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Installing A SM420 Transmission In Big Bolt Trucks 1947 And Older!!!
#1070562 Fri Nov 28 2014 03:37 PM
Joined: Apr 2005
Posts: 361
M
Shop Shark
I may have the answer for you, installing a SM420 trans without all the cost in Big Bolt trucks. I needed to replace my original 1942 235 engine it had a broken crankshaft. I installed a 1962 235 engine with low miles, along with 1948-53 truck bell housing and SM420 transmission behind it no more double clutching. I made a adapter plate to the bell housing to accept the clutch and brake peddle no need to have the piece with the three bolt holes from your old bell housing welded to the 1948-53 truck bell housing. Will post it as a Tech Tip at some point. If I say so myself it turned out great. If anyone would like to add a SM420 trans to their truck call me for the details will be happy to help. Pictures are posted at https://www.dropbox.com/sh/ll3i1o5ub495dqw/AABHvesdGvDMKwP7p0QtbhOba?dl=0 Phone number 1-262-392-2989 or mribbich@wi.rr.com

I SEE PEOPLE ARE HAVING TROUBLE FINDING MY POSTING THE BEST WAY OF GETTING THE INFORMATION IS TO CALL OR E-MAIL ME I AM ALWAYS HARRY TO HELP. THANKS!!!

Marv.

Last edited by marvin ribbich; Sun Jan 28 2018 01:31 PM.
Re: Tired Of Double Clutching???????
marvin ribbich #1070572 Fri Nov 28 2014 04:59 PM
Joined: Mar 2002
Posts: 8,998
Master Gabster
Could you post a photo of the adapter that you made? This is great news!


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: Tired Of Double Clutching???????
marvin ribbich #1070587 Fri Nov 28 2014 06:31 PM
Joined: Apr 2005
Posts: 361
M
Shop Shark
I don't know how to post photos but can send you pictures if you send me a email but it would be best to call also so I can explain it to all that want to know.1-262-392-2989 or mribbich@wi.rr.com

Marv.

Last edited by marvin ribbich; Fri Nov 28 2014 06:32 PM.
Re: Tired Of Double Clutching???????
marvin ribbich #1073159 Sat Dec 13 2014 05:37 PM
Joined: Apr 2005
Posts: 361
M
Shop Shark
I should mention that the truck I did this to is 1-1/2 ton it my not work on smaller tonnage units.

Marv.

Re: Tired Of Double Clutching???????
marvin ribbich #1074277 Fri Dec 19 2014 05:49 PM
Joined: May 2001
Posts: 1,434
W
Shop Shark
I had to double clutch my SM420 into high gear. I found that if I paused for an instant in neutral w/o the second clutching before continuing the shift into high, there was no grinding. The pause is no longer in time than the double clutch would take.

Also, my left knee appreciates it.


1948 3/4-Ton 5-Window Flatbed Chevrolet

28 Years of Daily Driving. Now with a '61 261, 848 head, Rochester Monojet carb, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Tired Of Double Clutching???????
marvin ribbich #1074278 Fri Dec 19 2014 05:56 PM
Joined: Sep 2001
Posts: 30,014
ace skiver
Marvin,

If you email photo(s) to me, I will host them and post links to them.

Wally,

You have double-clutch into 4th gear to avoid grinding - an SM420?


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE [1954advance-design.com] - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Tired Of Double Clutching???????
tclederman #1074367 Sat Dec 20 2014 01:46 AM
Joined: May 2001
Posts: 1,434
W
Shop Shark
Tim,

My SM420 (4-speed, granny gear, right?) would grind with a reasonably brisk single clutching. Doubling clutching solved the problem but just pausing an instant in neutral on the way to high gear also works so that's what I do now.



1948 3/4-Ton 5-Window Flatbed Chevrolet

28 Years of Daily Driving. Now with a '61 261, 848 head, Rochester Monojet carb, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Re: Tired Of Double Clutching???????
marvin ribbich #1074689 Mon Dec 22 2014 03:19 AM
Joined: Nov 2010
Posts: 1,189
W
Shop Shark
i've driven several trucks,(if not a dozen),of SM 420's through the years. if the synchro's are good,every gear should shift like butter. You just have to shift into "Granny",and reverse, when truck is parked,(or completely stopped),to keep from grinding gears. That's my experience.

Last edited by wetwilly5757; Mon Dec 22 2014 03:21 AM.

Just sold: 1955 2nd Series 6500 2-Ton Flatbed Truck
Mo' Tater
In the Stovebolt Gallery
More pics and videos on Photobucket

It takes an awful big dog to weigh a ton.
Re: Tired Of Double Clutching???????
marvin ribbich #1074695 Mon Dec 22 2014 03:35 AM
Joined: Sep 2001
Posts: 30,014
ace skiver

I have never had any grinding when up-shifting any of the SM420s I've had in my trucks.

However, Wally, your technique works for you and might help someone with worn synchronizers. What weight gear oil do you use in your transmission?


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE [1954advance-design.com] - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Tired Of Double Clutching???????
marvin ribbich #1075373 Thu Dec 25 2014 07:24 PM
Joined: Sep 2001
Posts: 30,014
ace skiver
"I made a adapter plate to the bell housing to accept the clutch and brake peddle no need to have the piece with the three bolt holes from your old bell housing welded to the 1948-53 truck bell housing." Marvin Ribbich

Here are some photos from Marvin.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE [1954advance-design.com] - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
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