The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1947 - 1959 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 08-24-2018, 03:55 PM   #1
2001convertable
Registered User
 
Join Date: Dec 2017
Location: wantagh new york
Posts: 132
1959 3100 4 speed gear lube weight

Hi, I have a 1959 with a 4 speed manual. I think its an sm420. Iam going on a 5 hour trip and wanted to change the gear lube before I leave. I drained it out. All I need to know is the type of lube and quantity. thank you
2001convertable is offline   Reply With Quote
Old 08-24-2018, 08:59 PM   #2
va4cqd
Registered User
 
Join Date: Aug 2008
Location: canada
Posts: 86
Re: 1959 3100 4 speed gear lube weight

75w90
should take 5.5 quarts if completely empty
va4cqd is offline   Reply With Quote
Old 08-24-2018, 11:00 PM   #3
mikebte
Senior Member
 
Join Date: Oct 2011
Location: Tucson, AZ
Posts: 390
Re: 1959 3100 4 speed gear lube weight

Can pick it up fairly cheap at a semi repair shop. I get all my transmission and gear oil at truck shops.
__________________
1959 Chevy Apache 3100/ 283 TBI / 4L60E
My YouTube:
https://www.youtube.com/mikebtte
mikebte is offline   Reply With Quote
Old 08-24-2018, 11:52 PM   #4
mr48chev
Registered User
 
mr48chev's Avatar
 
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 10,173
Re: 1959 3100 4 speed gear lube weight

85/90 isn't that spendy at the parts house. It takes 6-1/2 pints to fill that trans .
__________________
Founding member of the too many projects, too little time and money club.

My ongoing truck projects:
48 Chev 3100 that will run a 292 Six.
71 GMC 2500 that is getting a Cad 500 transplant.
77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.
mr48chev is offline   Reply With Quote
Old 08-25-2018, 08:55 AM   #5
1project2many
Registered User
 
Join Date: Mar 2012
Location: Lakes Region NH
Posts: 2,139
Re: 1959 3100 4 speed gear lube weight

Like many old transmissions, there is no input shaft seal some Muncie SM420 four speeds. The design relies on an oil slinger and LH "thread" on the input shaft to direct oil coming through the input shaft bearing onto the inside of the rear of the bearing retainer. From there oil is expected to drain back into the transmission case through a roughly 5/16" hole below the input shaft bearing. Switching to lighter base gear oil can create a fluid leak where none existed previously. Oil can work its way down the bearing retainer then end up on the flywheel and clutch disc creating a slippery mess and a truck with a slipping clutch. Having tried several different gear oils, multi-viscosity and single viscosity, I settled on 140 wt gear oil in the '57 and in my '36 Plymouth.

Last edited by 1project2many; 08-25-2018 at 09:13 AM.
1project2many is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 11:32 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com