Can anyone decipher 200 4R trans serial #?

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Jan 21, 2024 | 06:39 PM

TommyFox

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Melting Slicks

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From: Leland , North Carolina

Can anyone decipher 200 4R trans serial #?

121-860KCF1800

328-881CHF0212

Neither are the coveted BRZ Grand National but I have no idea exactly what they are. Looking to swap out the TH350

Jan 21, 2024 | 08:45 PM

gjohnson

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Joined: Mar 2008

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From: Denver CO

Pull the pan and look for the code on the valve body.Thats the identifier

KZF -- Olds 442/Hurst
CZF -- 85-88 Monte SS
CRF -- 85-88 LG4 305 powered Monte Carlos/Pontiac Grand Prix
BRF -- 86-87 GN/T-Type/Turbo Regals
BQ -- 84-85 GN/T-Type/Turbo Regals
BR -- 83 Model T-Types
TAF -- 89 Turbo Trans Am
OZ -- Hurst Olds
OM -- Olds 350 Diesels
OG -- lds 307
BY -- V-6 252 Cars
AA and AP -- Cadillac's

Last edited by gjohnson; Jan 21, 2024 at 08:50 PM.

Jan 21, 2024 | 10:10 PM

ratflinger

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From: South of giving a damn

St. Jude Donor '11, '17

Quote:

Originally Posted by TommyFox

121-860KCF1800

328-881CHF0212

Neither are the coveted BRZ Grand National but I have no idea exactly what they are. Looking to swap out the TH350

Doesn't really matter as you can stuff all the good stuff into them.

Jan 22, 2024 | 05:15 AM

TommyFox

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Melting Slicks

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From: Leland , North Carolina

Thanks. KCF and CHF are not on the list so I can't tell what it came out of.

Jan 22, 2024 | 09:05 AM

speedreed8

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Joined: Oct 2006

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From: Texas

I think all the letters end in F. Maybe a v6 model. CH. KC
i have a CQ in my 79.

Jan 22, 2024 | 10:19 AM

ratflinger

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From: South of giving a damn

St. Jude Donor '11, '17

Quote:

Originally Posted by RamJet502

What?

All the GN parts as well as even better aftermarket internals are available to substantially strengthen a 200R4

Jan 23, 2024 | 05:51 PM

TommyFox

Thread Starter

Melting Slicks

Joined: Jun 2011

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From: Leland , North Carolina

Quote:

Originally Posted by ratflinger

All the GN parts as well as even better aftermarket internals are available to substantially strengthen a 200R4

Yeah, was hoping to get a decent used one and throw it in.

Jan 23, 2024 | 10:10 PM

ratflinger

NCM Grand Opening Veteran

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From: South of giving a damn

St. Jude Donor '11, '17

Quote:

Originally Posted by TommyFox

Yeah, was hoping to get a decent used one and throw it in.

Then you should also buy lottery tickets

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Jan 23, 2024 | 10:18 PM

calwldlife

Team Owner

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From: Southern Cal Ca

St. Jude Donor '22

valve body is the key, even though kits are available, I have the impression
gran national ones are drill different and have different dia valve bores?

governors can be swapped.

Jan 24, 2024 | 04:34 AM

#10

ratflinger

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From: South of giving a damn

St. Jude Donor '11, '17

Get the ATSG for the 200-R4. It will explain any differences between units.

Jan 24, 2024 | 11:11 AM

#11

Eric P

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The main differences are the valve body separator plate hole sizes and calibration of the valve body itself, in late 1987 they changed the 3-4 accumulator housing design . they do have 5 different wiring schematics depending on valve body pressure switches , if it has 3rd gear pressure and 4th gear pressure switch ,or 3-4 pressure switch only , 3-4 pressure switched with 4th pressure switch and last the 4th gear switch only .... some valvebody's can have Lockup in 3rd gear and 4th gear , some just 4th gear ... the govenor has different tooth count for rpm shift points , more teeth for higher rpm , less teeth for lower rpm shift points , Trans-Go and Sonnax have valve body calibration kits for the 200R4

Jan 27, 2024 | 09:39 AM

#12

TommyFox

Thread Starter

Melting Slicks

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From: Leland , North Carolina

Debating if it's worth the trouble to buy a so called used 'good' transmission and have troubles only to have to pull it again.

Jan 27, 2024 | 09:50 AM

#13

ratflinger

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Joined: Sep 2005

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From: South of giving a damn

St. Jude Donor '11, '17

Quote:

Originally Posted by TommyFox

Debating if it's worth the trouble to buy a so called used 'good' transmission and have troubles only to have to pull it again.

People do, but it's Russian Roulette

Jan 27, 2024 | 02:04 PM

#14

TommyFox

Thread Starter

Melting Slicks

Joined: Jun 2011

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From: Leland , North Carolina

Quote:

Originally Posted by ratflinger

People do, but it's Russian Roulette

I got a used one from a wrecked Buick GN back in 1998 with 50,000 miles and installed it in a 1978 Trans Am.. It worked flawlessly. I don't think I will get that lucky this time.