Whats the difference (if any) between the thm200-r4 and the th200-4r transmissions? How do you tell them apart? What r the strengths and weaknesses? It doesn't matter what its goin in, just the differences and identification please. Sent from my SAMSUNG-SM-J320A using Tapatalk
Do you mean the Turbo 200 and the 200 4R? The 200 4R is an overdrive transmission and the Turbo 200 is not. The 200 4R can be made into a strong transmission. It was used in the Buick Grand National.
The "M" makes no difference nor does the hyphen. TH or THM is the same same Stands for turbo hydramatic or turbo hydra-matic. The numbers are basically the "strength" or size of the transmission The letter is the orientation , R is rear wheel drive The next number is the number of gears. The 200r4 can be a great transmission. You either spend the money and build it stronger or don't put much power to it. The gear ratio spread is much better the the 700r4
No. Totally different transmission. Stay away from the Turbo 200, its supposed to be very weak. I have heard nothing good about it.
Thanks for the replys. Just tryin to figure out the differences in these 2 trannys and how to identify them. My book says they both take the same filter but only shows the exploded view and parts list of the TH200-4R. Sent from my SAMSUNG-SM-J320A using Tapatalk
Please note that the three listings that are variations of 2004R all have the same ID number in the last column (745034) and that the name variations depend on the year model. It appears than in some years the transmission model was described one way, and in others, another way. But, again, all the name variations (that include 200R4) are the same ID #745034. The TH 200 is a three forward speed trans and has an ID #745048. Ray
The book shows THM200R4 from 1980 to 1990. The TH-200-4R from 1986 to 1990. For Oldsmobile at least. Sent from my SAMSUNG-SM-J320A using Tapatalk
Aftermarket parts books don't always have the nomenclature correct. Even the GM documentation has different nomenclature for the same part. I wouldn't worry too much about it. There is a 200-4R transmission (overdrive), and a 200 transmission (3 speed), and a 200C transmission (3 speed with lockup converter) The TH or THM names before them were used in some places, and left off in others, they don't tell you anything, really. The important thing is the 200 which tells you the approximate design torque (ft lbs) the trans can handle, and the C tells you it's lockup, and 4R tells you it's an overdrive transmission (all the GM overdrives have lockup converters). Later transmission nomenclature was changed to the modern version, where the 200 would be something like 3L40 where the first number is the number of speeds, letter is longitudinal or transverse, and the number is a relative torque rating. it would have an E on the end if it were electronically controlled shifting.
TH-200 is a "metric" 3 speed automatic transmission (there's also a TH-200C; lockup converter), and the word metric is embossed in the pan. Also, the TH-200 is becoming THE transmission to use by the GM Stock and Super Stock/Comp drag racers. It will COST $$$$$ to build one up for drag racing; see Scott McClay Engineering for more information if interested. The 200R4 is an overdrive 4 speed automatic transmission, and is fairly weak in stock form; they too can be beefed up to handle a LOT of HP/torque. It also has a trans-mount located to the very end of the transmission (they don't have a separate extension housing like a Glide, TH350 (and 200, 250), TH400, 700R4, and some of the earlier GM aluminum cased automatics, and the later computer controlled automatics), so the transmission crossmember has to be moved back. You're probably more confused now than you were when you started this thread, and my head hurts. I am Butch/56sedandelivery.
METRIC is also stamped into the bottom of the 200-4R pan. But as the TH200 came out first and was the only GM trans with this stamping it became known as the 'Metric 200' in the transmission industry. Please note the name is 200-4R and the other GM overdrive unit is a 700-R4 (note the order of the 4R and the R4) it is a common mistake to mix these up, as is the case in the parts book you are using. I would argue the '200' designation is a torque capacity, as that implies a 700-R4 has a significantly higher torque capacity which it most certainly doesn't.
Thanks, English John.......you got the details correct ‘re the number/letter order and, more importantly challenged the the idea the number is a direct indication of torque rating. I would concede the number may have some relationship to design size/strength, but not as a direct indicator of lbs/ft or Newton meter of torque capacity. Ray
The 700 is the exception to the rule about the torque ratings. They were just names, after all.... The TH125, TH180, TH200, TH250, ST300, TH325, TH350, TH375, TH400, TH425, TH475 all fit in line pretty well.
Does anyone have a pic of the 200-4R pan. The actual pan on the tranny would be a lot of help. And again, thanks to everyone for the posts. Sent from my SAMSUNG-SM-J320A using Tapatalk
The original question -- the difference between th2004R & th200R4. Same critter, just have the 4R & the R4 transposed.
56Don wrote - "No. Totally different transmission. Stay away from the Turbo 200, its supposed to be very weak. I have heard nothing good about it."" This is a completely false comment. Scott McClay Engineering (and a few others!!) will build anyone a T-200 (or T-200-4R) that can be bolted to an engine with over 1000+hp and stand up to it. He's been building these for about ten years now and has them in many NHRA Comp. Elim., Super Stock and Stock cars. The first three gear sets of the T-200-4R are the same as the T-200 and WILL hold up to the same 1000+hp. power. The overdrive (or 4th gear) is not up to the task of controlling that much power. 550hp/600hp is not a problem for the fourth gear if treated properly. He also builds Trans. Brakes for both the three speed and the four speed trans. I have two of his 4 speeds, both with brakes. Mike
Pretty much correct. The 200 4R is basically a 200C with the OD planetary on the input shaft. Everything else is all the same, just shoved back a ways. It does have the modern , aluminum vane pump. The weak link is the stub shaft to the forward clutch. But it's not that weak . My 62 455 Tempest and my race partner's 49 Chevy ( 455 Olds) both were true street cars that ran high 11's, low 1.50 60' times, and never broke any hard parts. Mine had all factory type parts, except a billet servo, and a welded, wide band. I don't know what a 200R4 is, but I suspect it's exactly the same trans with a different designation.
The Jalopy Journal
