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Posted by: Jimbo ()
Date: August 31, 2011 07:46PM

Hello All, For the life of me I can't find where to look up trans. numbers.
Looked in junkyard primer and page 2 of clarks, still can't find.
NEED HELP I did find the small stamped #s 1st one is R1121 2nd
is P0208 and where do you find this???

and what is a fair price for him and me for a EM 4 speed trans???

Posted by: Johnniespeed ()
Date: September 01, 2011 09:24PM

Because I couldnt find the numbers either, I count the input shaft splines and I count the first gear teeth. That was good enough to do what I needed to do.
As you know the differential codes are easy.
I hope someone can post or link the info about transmission number identification.


1962 Rampside, 4.3 Vortec powered.
The thrill of speed overcomes the fear of death.

Sparta Michigan.

Posted by: cnicol ()
Date: September 01, 2011 10:54PM

Transmission ID is, as Joel stated, best done by observation of transmission details.

1st gear ratio 4:26 (61E truck) or 3.65 (61L-65 truck, 61-63 car) or 3.20 (64-5 car)
Presence of reverse switch provision (With = car W/O = FC truck)
Presence of drain plug (61-63)
Presence of dip stick (64 & 65)
Number of input shaft splines (12= '61-3 145 engine or 14= '64-5 164 engine)
Date code (month and year made)
Part number of case

There are about eight models of the 61-5 4-speed trans.

I wrote an article about all the variations if anyone is interested, PM me your email address.

R1121 is a January 12 1961 four speed.
P(R)0208 may be an over-the counter replacement if its a 4-bolt 4-speed; regular production of the 4-bolt 4-speed ended in mid-65.

If that "8" is right that would be 1968. The problem with that theory is that I have an NOS over-the-counter 1968 replacement (K228) and as you can see the format of the date code is different than yours and the date code on mine is the right format for the year.

For a true ID, you will need to examine the trans against the list above. If you need more help, feel free to ask.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
65 Canadian Monza 4dr 110/PG 40k
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

Edited 2 time(s). Last edit at 09/01/2011 10:58PM by cnicol.

Posted by: gwydionjhr ()
Date: September 01, 2011 11:20PM

Small fill plug = 61
Large fill plug = 62>

Of course none of these (including what Craig posted above) mean much to you if you don't know the relative difference between "small" and "large", which is why we asked for pics.

Joel Rushworth
1961 Rampside w/Deluxe Scamper Camper
1966 Corsized Cdn Monza Coupe
1967 UV #292
"Kick the Hell out of the Status Quo" - Ed Cole

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