Yeah, the 75 is the year the EK is the designation (minor calibration alteration and a switch added to valvebody for emission controls from the previous EH model) and the rest is the production number. As HK1837 says the number always starts at 1001. EH went behind 350 Chev engines and the EK went behind the 5. Ms Money Sunset. 0 litres HJ-HZ. Castings in the bell housing generally don't have any significance like the numbers cast into engine blocks. Some casting numbers signify extra strength or ribs in some area's for Heavy duty applications. Number sequence resets every year, until Hydramatic went to Julian dates and then it all altered again, regarding the switch, my memory is vague on this, we may not have utilised the switch until 76 but the switch was never the less there as it would have been used in other vehicles in America that required it, if it was not there then the code should have changed. I would have to go through all my old calibration notes to find the exact date we adopted the use of the switch but there is not much point.

Powerglide Aluminum case *. 1962 1 Code Prefix, 1963-73 2 Code Prefix. No code, use transmission serial # for parts ordering, No code, use transmission serial # for parts ordering. GM Turbo Hydra-Matic/ 375/ 400 3. Sep 8, 2009 - Transmission - TH400 Serial Number Plate - The ID plate on my trans broke off. De_Dust2.Vmf Download Css there. I don't have it anymore. The stamped numbers on the left side of trans (just above pan) match the engine and VIN mumbers and these match the documentation I have (e.g.

If the connector on the LHS of the box has two pins in it and is still original as you say then you have your answer. An ohm meter wont help you either as the switch is open circuit when not pressurised, so you would have topull the pan if you wanted to check or use a volt meter when driving. There were a few boxes that we experimented with the calibration on in some models to find improvements, mostly accumulation and shift points, some got lightweigth governors. I'm pretty sure we always used the late valve bodies but it was 30+ years ago.

1962-74 Pontiac Automatic Transmission Codes AUTOMATIC TRANSMISSION IDENTIFICATION PONTIAC Tempestorgue 1962 1 Code Prefix 4-195 No stripe V8-215 White stripe on governor Super Hydra-Matic 3 1962-64 2 Bar. Carb PS 3 Carburetors PAS 4 Bar. Carb PBS Economy Engine PES Roto Hydra-Matic 375 4 1962 Economy Engine PE 425A Engine Tri-Power, Police PA 4 Bar. Carb PB Except above P 19 64 389 Engine 2 Bar. Carb, High compression P 389 Engine 2 Bar. Carb, Low compression PE 389 Engine 4 Bar. Carb, Catalina PB 389 Engine 4 Bar.

Carb, Grand Prix PG Tempest/ Pontiac Two Speed 5 Buick Super Turbine 300 19 64 V6 Air cooled 20 V8 Water cooled 30 19 66 L6 1 Bar carb LA L6 4 Bar carb LB V8 2 Bar carb MA V8 4 Bar carb MB V8 G.T.O NA V8 A/C, A.I.R MC 19 68 6-250 1 Bar carb. LA 6-250 4 Bar carb LB 6-250 1 Bar carb. A/C LD 6-250 1 Bar carb.

Firebird LF 6-250 4 Bar carb Firebird LG V8-350 2 Bar. MA V8-350 4 Bar. MB V8-350 2 Bar. A/C MC 1970 (1970- 1973 )* 6-250 EB V8-350 Tempest EA V8-350 Catalina EC GM Turbo Hydra-Matic /375/400 4 Buick Super Turbine 400 19 65-66 3 Carburetors PA V8-389 PB V8-421 PC Heavy duty Unit PH V8-421 Exc. 2+2 PG 19 68 V8-400 2 Bar.

PB V8-400 4 Bar. Carb Grand Prix PG V8-400 Ram Air GTO, Firebird PQ V8-400 2 Bar. Carb.,GTO PT V8-400 4 Bar.

Carb., GTO, Firebird PX V8-400 4 Bar. Carb., A/C, Firebird PY V8-400, 428 Heavy duty PH V8-428 Single Exhaust PA V8-428 4 Bar. PC 19 70 V8-400 Pontiac PB V8-400 Ram Air GTO PD V8-400 Tempest, Grand prix PT V8-400 4 Bar. Carb., Grand prix PW V8-400 2 Bar. Carb., Firebird PF V8-400 Sport option PX V8-400 Ram Air H.O.

PQ V8-455 Exc.H.O. Pontiac PA V8-455 H.O. Pontiac PC V8-455 Heavy duty Pontiac PH V8-455 H.O. Tempest, Grand Prix PR 1972 V8-400 Wagons PA V8-400 4 Bar. PB V8-400 2 Bar. PD V8-400 4 Bar. Carb., LeMans, Firebird PG V8-400 2 Bar.

Carb., LeMans,Firebird PT V8-400 4 Bar. Carb., Grand Prix PX V8-455 2 Bar. Carb., Pontiac PA V8-455 4 Bar. Carb., Pontiac PC V8-455 H.O. LeMans,Firebird PQ V8-455 4 Bar. Carb., Grand Prix, LeMans PR 1974 V8-400 2 Bar.

Wagons PA V8-400 4 Bar. Police & HD PA V8-400 4 Bar. Carb., Pontiac PB V8-400 2 Bar. Carb., Pontiac Exc. CA PD V8-400 2 Bar. Carb., Pontiac CA PF V8-400 4 Bar. Carb., LeMans, Firebird Exc.

CA PG V8-400 4 Bar. Dfx Audio Enhancer Windows 7. Carb., LeMans, Firebird CA PW V8-400 2 Bar. Carb., LeMans, Firebird Exc.