M-21 Muncie - What Ya Using For Lube? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 11-11-2012, 06:06 PM
lakeroadster's Avatar
Hot Rods are Built, not Bought
 

Last journal entry: Lakeroadster's '31 Model A Tudor
Last photo:
Join Date: Dec 2001
Location: High Plains - Rocky Mountains
Age: 53
Posts: 645
Wiki Edits: 0

Thanks: 26
Thanked 88 Times in 80 Posts
M-21 Muncie - What Ya Using For Lube?

Just as the title states: What Ya Using For Lube on a M-21 Muncie? My '65 C-10 has red trannny fluid in it from the previous owner. I need to change the lip seal in the tail housing, so nows the time to choose the right lube.

    Advertisement
Reply With Quote Quick reply to this message
The Following User Says Thank You to lakeroadster For This Useful Post:
Larry Anderson (11-12-2012)
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-11-2012, 06:39 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Here is a post covering it: muncie fluid change with no drain hole

Good luck.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-11-2012, 07:03 PM
lakeroadster's Avatar
Hot Rods are Built, not Bought
 

Last journal entry: Lakeroadster's '31 Model A Tudor
Last photo:
Join Date: Dec 2001
Location: High Plains - Rocky Mountains
Age: 53
Posts: 645
Wiki Edits: 0

Thanks: 26
Thanked 88 Times in 80 Posts
Thanks for the link.

I am wondering how big a deal it is in regards to flushing the trans to get the ATF fluid out before filling with Sta-Lube GL4 from Napa?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-11-2012, 09:11 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by lakeroadster View Post
Thanks for the link.

I am wondering how big a deal it is in regards to flushing the trans to get the ATF fluid out before filling with Sta-Lube GL4 from Napa?
If the trans in in the car, do two fills.

First fill run for a short distance just to thoroughly mix the new lube w/the remaining ATF (if that's what it was and not some sort of synthetic gear lube), then dump. Second fill keep for the duration.

The smell will tell you if it was ATF if there's any question, obviously if it was piss thin you know it's not right because the correct gear lube is very viscous compared to any ATF.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-11-2012, 10:16 PM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 57
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 90 Times in 85 Posts
I can't say that I've ever heard a recommendation to use ATF in an M21, but I do recall Ford's recommendation of using it in a NP 203 transfer case on a Ford 4x4 in order to improve cold-weather shifting.

Those T-Cases also had a little oil pump in them as well, and I suspect that they mave have been another reason behind using a lower-viscosity lubricant than the 80W90 gear oil, which is thicker than molasses at -30.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-12-2012, 04:54 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
FWIW there are several common manual transmissions that use ATF type fluid (like the T-5 for one), but like you said- sure not a Muncie 4-speed.

The OP could have a synthetic manual trans lube like Castrol BOT 402- it's red and has a GL 4 rating. But it's also thicker than ATF: SAE 75W-85. But at least it would be the right lube.

I'd do the smell test before assuming it's ATF, though. The two (ATF and gear lube) smell markedly different. Hopefully it's been filled w/gear lube and it just looks like ATF.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-12-2012, 05:10 AM
lakeroadster's Avatar
Hot Rods are Built, not Bought
 

Last journal entry: Lakeroadster's '31 Model A Tudor
Last photo:
Join Date: Dec 2001
Location: High Plains - Rocky Mountains
Age: 53
Posts: 645
Wiki Edits: 0

Thanks: 26
Thanked 88 Times in 80 Posts
Thanks guys, I 'll switch it over to Sta-Lube GL4. I found this article while searching the internet.

ATF in a muncie? - THE H.A.M.B.

I had a 1985 S-10 with a 5-speed manual, it used ATF in the tranny. But on my ole Muncie that thicker GL4 will help to keep my truck from "marking it's territory. Well the thicker lube will help, but the new lipseals and shift arm seals will no doubt help more.

Thanks again,

John
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 11-12-2012, 06:36 AM
gino21's Avatar
Registered User
 
Join Date: Nov 2012
Location: canada
Posts: 1
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
m 21 muncie

What ever you run steer clear of synthetic gear oil it doesn't allow the synchros to do their job especially at higher rpm cause it's. too slippery.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 11-12-2012, 06:44 AM
Registered User
 
Last photo:
Join Date: Jun 2010
Location: Syracuse, NY
Posts: 2,209
Wiki Edits: 0

Thanks: 514
Thanked 225 Times in 201 Posts
Gino is correct.
Also, The fill/drain hole is located incorrectly. I wish I still had the service bulletin but, the actual measurement is to fill it till you can insert the tip of your finger and bend it at the first knuckle and touch the fluid. They designed it around a 1qt capacity. Over filling it is actually as damaging as under filling it.

You can run a Muncie on 1qt with no averse effects. It will run cooler and shift faster. The P/N for the Sta-Lube is SL24229 @ Napa. I have a lot of customers who also use Brad Penn and the only synthetic I can recommend (mostly for people who can't find the Sta-Lube) is Royal Purple's MAX GEAR in a 75w-90 or there abouts. Only the MAX GEAR though. You do not need an additive package with any of these oils.
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 2 (0 members and 2 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Muncie Lube fpalmerjr Transmission - Rearend 2 03-13-2008 12:27 PM
Muncie problems Muncie guru needed chirpn69 Transmission - Rearend 8 04-19-2007 10:28 AM
What Gear Lube For My Rebuild Muncie JimKramer Transmission - Rearend 2 03-22-2006 08:38 AM
Muncie lube 35chev/302gmc Transmission - Rearend 1 05-24-2005 04:58 AM
Cam Lube MI2600 Engine 9 03-31-2004 07:25 AM


All times are GMT -6. The time now is 08:23 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.