200r4 behind bone stock 68 327/210 - Team Camaro Tech
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Transmission & Driveline Transmissions and Differentials

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  #1  
Old Dec 9th, 12, 08:28 AM
Frank350 Frank350 is offline
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Default 200r4 behind bone stock 68 327/210

I just bought a used 200r4 transmission what was taken out of a 1988 Monte Carlo SS. It's the original CZF transmission with about 90 k miles on it, supposedly ran good.

I want to install this transmission behind a bone stock 2bbl 327. I read those were good transmissions to start with (Monte SS, Hurst Olds, Buick GN) and got this one for next to nothing. What concerns me is the fact that my rear end gears are 3.08 and the Monte it came from was originally 3.73...should this be a concern ? I'm running 215-70-14 tires which are 25.9 inches tall. This car will be babied all the time and will be used mainly for cruising to shows and some long distance travel on the highway.
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  #2  
Old Dec 9th, 12, 08:59 AM
BPOS BPOS is offline
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Default Re: 200r4 behind bone stock 68 327/210

I should work great in 1st through 3rd. Not so sure about in OD with 3.08s and 210 hp. Might be ok on a dead flat road.
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  #3  
Old Dec 9th, 12, 09:05 AM
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Default Re: 200r4 behind bone stock 68 327/210

Frank, you will need to upgrade the gears to 3.73s. I put a 86 monte CZF in mine (love it BTW) with 3.55s and the shift points are enough out of place to annoy. Up shifts are fine, but it does not want to come out of 4th until 25mph, which lugs the engine. With 3.08, this will be be worse. The internal calibrations (which cannot be changed ) are set for 3.73s. The TV cable adjustment does not help with that.
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Old Dec 9th, 12, 10:04 AM
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Default Re: 200r4 behind bone stock 68 327/210

A Stock 200-4r out of an '88 SS only had to deal with a 180 HP 305. With 90k miles and your 3.08:1 gears it may not last. It's a great base for a rebuild with better internal parts and if you swap gears to a 3.43 or 3.73 it will be a great addition to your car.
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  #5  
Old Dec 9th, 12, 11:20 AM
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Default Re: 200r4 behind bone stock 68 327/210

Depends on what your camshaft specs are also. However, have to agree with previous poster about a stock 2004R living for any amount of time. That 327 of yours isn't putting out too much more than a 305 when you compare gross to net hp ratings. Many articles on how much and what needs to be done to 2004R to make it live behind any power.
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  #6  
Old Dec 9th, 12, 03:52 PM
Frank350 Frank350 is offline
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Default Re: 200r4 behind bone stock 68 327/210

PM sent, Plain Jane.
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  #7  
Old Dec 10th, 12, 04:24 AM
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Default Re: 200r4 behind bone stock 68 327/210

The trans should handle the power fine if it is in good shape. The shift points can be changed but modifications will need to be made all of them can be done without major internal tear down. Check the various web sites that offer 200r4 kits and mods. However your rear gear may be to high , do the math see what your rpms would be in 4th gear at 60 mph . I think its a .67 overdrive. It might be more of a project than you wanted. Good luck
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  #8  
Old Dec 10th, 12, 03:14 PM
Frank350 Frank350 is offline
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Default Re: 200r4 behind bone stock 68 327/210

Ok...I guess I'll start looking for 3.55 or 3.73 gears. All the comments make sense, thanks to everyone. Should the 2004r torque converter bolt to my 327 flywheel ? I understand I may have to use metric bolts. Frank.
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  #9  
Old Dec 10th, 12, 03:23 PM
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Default Re: 200r4 behind bone stock 68 327/210

The stock converter bolted right up to my original PG flexplate just fine.
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  #10  
Old Dec 10th, 12, 03:31 PM
Frank350 Frank350 is offline
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Default Re: 200r4 behind bone stock 68 327/210

Quote:
Originally Posted by KevinW View Post
The stock converter bolted right up to my original PG flexplate just fine.
Thanks Kevin. Frank.
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  #11  
Old Dec 10th, 12, 04:22 PM
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Default Re: 200r4 behind bone stock 68 327/210

Remember that many g-body cars had the 200-4r and naturally aspirated 231ci engines coupled with 2.56 and 3.08 gear ratios. While not optimal, it does work. The shift points will be off for your combo given the different governor calibration. My GN had a built 200-4R, when out of boost that car was just a little 231ci engine making minimal power. I had 3.42s and a 28" tire, never an issue. 10 second ETs and 27MPG. I worked at Dynotech in NJ before Eric passed away, on a few customers' cars we even went down to a 3.23 ratio with 28" tires. A stock 327 should have no problem making as much as or more power than a little V6 at cruise speed.
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Old Dec 10th, 12, 07:10 PM
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Default Re: 200r4 behind bone stock 68 327/210

Monte Carlo SS didnt automatically get a 3.73 rear most had 7.5 single trac 2.73s. The 442 got an 8.5 posi with 3.73 as part of the 442 packag
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  #13  
Old Dec 10th, 12, 07:33 PM
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Default Re: 200r4 behind bone stock 68 327/210

Here is the info on the Monte SS rear gears from this site http://www.montecarloss.com/SS_FAQ_5.html

Quote:
Q: What was the rear gear ratio for the SS?
•For 1983 and 1984 Monte Carlo SS's, the rear differential ratio was 3.42:1
•for 1985 through 1988 Monte Carlo SS's, the rear differential ratio was 3.73:1
•There were no other gear combination options available.

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you will also need to know the cooling line info to correctly plum them (they are opposite from 69 directions)

Quote:
Q: Which transmission coolant line is which on the transmission?
•TH-200-4R (1986-1988):
◦The upper transmission coolant line on the TH-200-4R transmission is the pressure side (hot fluid pumped out of the transmission).
◦The lower transmission coolant line on the TH-200-4R transmission is the return side (cooled fluid returning from the radiator).
•At the radiator, the upper coolant line is the return side.. the lower coolant line is the pressure side.

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