Tranny codes...what kind is it? - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 8 (permalink) Old Jul 2nd, 05, 11:17 PM Thread Starter
 
Join Date: Nov 2004
Location: Derry, PA
Posts: 30
Question Tranny codes...what kind is it?

Can someone help me with decoding the type of transmission I have?

4 speed.

Here are the numbers and location:

code location
3952659WB drivers side by clutch linkage
38575846M passenger side drive shaft enters

392566 US Patent 3088336 General Motors Corp P0524A..on passenger side midway on tranny

I was told it is a Muncie.

Thanks for your help
Paul's '66 in PA is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old Jul 2nd, 05, 11:32 PM
Lifetime Premium Member
Dave
 
Join Date: Mar 1999
Location: Agawam, MA
Posts: 1,750
Re: Tranny codes...what kind is it?

1970 wide ratio (2.52 1st gear) assembled May 24th.

Dave
USAF Retired (1968-1988)
UTC Aerospace Systems, Space Systems International - Retired (1989-2014)
David Bates is offline  
post #3 of 8 (permalink) Old Jul 2nd, 05, 11:38 PM
Senior Tech Team
Aaron
 
Join Date: Jan 2003
Location: Walnutport Pa, USA
Posts: 6,323
Re: Tranny codes...what kind is it?

392566 -
i think thats the number you need. the big print one. there should be a zero at the end (after the 2nd 6). it is the same as mine...
which would be a 68-70 m20,m21,m22 case

P0524A

P-Muncie 4spd
0-is the year 1970
5-im guessing its the month, which is May. (most of them should have a letter for the 3rd digit, which would represent the month, like A for Jan. B for Feb, and so on).
24- 24th day of the month
A-m20 2.52:1 first gear, wide ratio

so all in all, its an M20 wide ration tranny, built on May 24th, 1970


aaron

1971 Chevelle. 355, megasquirt efi. On3 7875 turbo. 700r4, 355 gears. C5 brakes, SC&C stg2+, hellwig bars, 04-06 gto seats. 546rwhp/450rwtq with 28% converter slip on 18psi!

Little walk around video

http://youtu.be/D_B0B1RNmcc
BowtieAaron is offline  
post #4 of 8 (permalink) Old Jul 2nd, 05, 11:39 PM
Senior Tech Team
Aaron
 
Join Date: Jan 2003
Location: Walnutport Pa, USA
Posts: 6,323
Re: Tranny codes...what kind is it?

ah u got to it before i did dave. you must of posted while i was still trying to right it up.


aaron

1971 Chevelle. 355, megasquirt efi. On3 7875 turbo. 700r4, 355 gears. C5 brakes, SC&C stg2+, hellwig bars, 04-06 gto seats. 546rwhp/450rwtq with 28% converter slip on 18psi!

Little walk around video

http://youtu.be/D_B0B1RNmcc
BowtieAaron is offline  
post #5 of 8 (permalink) Old Jul 3rd, 05, 10:00 AM Thread Starter
 
Join Date: Nov 2004
Location: Derry, PA
Posts: 30
Re: Tranny codes...what kind is it?

Thanks for the info. Can you explain the term "wide ratio"?
Paul's '66 in PA is offline  
post #6 of 8 (permalink) Old Jul 3rd, 05, 10:48 AM
Lifetime Premium Member
Jody
 
Join Date: May 2005
Location: Reading, PA
Posts: 1,969
Re: Tranny codes...what kind is it?

In your case, wide ratio refers to a 2.52:1 first gear verses the close ratio transmission with a 2.20:1 first gear.

Regards, Jody
JodysTransmissions is online now  
post #7 of 8 (permalink) Old Jul 4th, 05, 3:22 AM
Team Member
Tom
 
Join Date: Sep 1998
Location: Mustang, OK USA
Posts: 11,187
Re: Tranny codes...what kind is it?

Wide ratio vs close ratio relates to the spacing of the gears.
What that actually means in regards to driving is that there is not as much change in engine rpm between gears with a close ratio as there is with a wide ratio.
Generally speaking, the wide ratio is the more compatable tranny for a street dirven car that has a fairly high geared rearend, such as a 3.08, 3.31, 3.55. The close ratio is more compatable with a performance geared rearend such as a 3.70, 4.10, 4.56.

Tom Parsons
TC# 474
#3 FOREVER!!!!!
Light travels faster than sound. That is why some people appear to be bright until you hear them speak. (unknown)
DZAUTO is offline  
post #8 of 8 (permalink) Old Jul 26th, 07, 12:30 AM
Tech Team
Greg
 
Join Date: Apr 2007
Location: Minnesota
Posts: 39
Re: Tranny codes...what kind is it?

Tom,
Great reading you input, what make it compatible? Gas mileage or quick off the line starts or just cruising down the highway.
Thanks, Greg
1970 and 65 Chevelle "newbie"
1974grad is offline  
Sponsored Links
Advertisement
 
Reply
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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. Note, you will be sent a confirmation request to this address.

Email Address:
OR

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.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
motor and tranny in at same time?? THE DUDE Performance 9 Mar 23rd, 05 11:28 AM
Tranny isn't working at all after shift kit installation... fat jonny Transmission & Driveline 4 Jul 30th, 04 9:50 AM
new dealer tranny in 94 Chrysler Town and country down shifting all the time? hilljack Transmission & Driveline 8 Feb 27th, 04 2:42 AM
Water in my TRANNY jcchevelle Transmission & Driveline 8 Oct 27th, 03 8:47 AM
Replacing Clutch - which Kind?? MoparMan 2000 13 Jan 8th, 01 11:42 AM

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

 
For the best viewing experience please update your browser to Google Chrome