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Username Post: Transmission identification help        (Topic#374490)
Posts: 2

Reg: 08-05-14
02-12-24 10:38 AM - Post#2866826    

Hi, I’m an amateur and I have a small block Chevy engine mounted to a transmission. I have a 1949 Chevy truck 3100. The sbc has no casting numbers, either rust or oil is covering the numbers but a few people told me it’s a 283 or 327.

The driver side numbers on the transmission is GM 3925660
The passer side numbers are 3925660 and right below it is

US patent No 3088336 general motor corp

I want to buy a new engine or rebuild my old one so I’m trying to figure out the transmission


"9th Year" Gold Supporting Member
Posts: 743

Loc: Georgia
Reg: 05-06-10
02-12-24 01:22 PM - Post#2866833    
    In response to wizxon8dwr

Muncie 4 speed, late 60s 3/mu...

Can you post pictures of your engine?

"18th Year" Silver Supporting Member
Posts: 15098
Loc: L.A, Cal. & St. Louis...
Reg: 04-07-03
02-13-24 07:37 AM - Post#2866850    
    In response to drtyler

Can you post a picture that shows the front of the heads? Also, if you pull a valve cover the heads will have casting numbers and date code cast into each head.

If the trans is a Muncie, more than likely the engine is a 327.

1953 210 Convertible, 261 with dual Carter YF 966S carbs, P.S., Remote Bendix P.B. Booster... shade-tree restoration about done.

Member #51
Posts: 9238

Loc: Mustang, OK, USA
Reg: 12-25-99
02-13-24 12:42 PM - Post#2866860    
    In response to drtyler

  • drtyler Said:
Muncie 4 speed, late 60s 3/mu...

Can you post pictures of your engine?

Yep, that is correct.


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