'86 2004r differences?

O

oldsmobile joe

Royal Smart Person
Nov 12, 2015
1,255
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mpls
just wondering what the differences are between an 86 monte ss "g" engine code 2004r trans and an 86 442 "9" engine code 2004r trans?
i know the dip stick tubes are different but what about stall speed of torque converter and shift points.
will the chevy shift at higher rpms compared to the olds?
 
84 W40

84 W40

Master Mechanic
Dec 9, 2009
373
63
Chevy did have higher shift points than olds in 86-87. Olds in 83-85 OZ trans had the same shift point has the 86-87 chevy ss. Stall was the same 2400 rpm , D converter in all them SS , 442, Hurst, GN
 
gnvair

gnvair

G-Body Guru
Sep 1, 2018
572
93
Southern New Jersey near Philly
The main differences the in transmissions are the valve body and governor (which are matched). Also the performance models will have a larger servo. The other hard parts in them are the same regardless of application.
The torque converters also depend on application. The Turbo Buicks and Monte Carlo SS both use the same D5 coded unit. The stall speed difference is because of the difference in torque output between the 2 engines. There are other subtle differences but generally you can take a generic 2004r from a non performance model and add the valve body, governor and servo from a performance model and have the performance model transmission.
 
69hurstolds

69hurstolds

Comic Book Super Hero
Supporting Member
Jan 2, 2006
3,648
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Not sure about factory calibrations, but here's what I found out about some of the torque converters out of the parts book. This is just a partial search, because these were ALSO found in the F-body 700 trans as well.

P/N 8634993 (reman). These were also found in the '85 AP, BQ, CQ and OZ, '86 AP, CZ and '87 CZ. Part number later changed to 8656956 which is called out for basically all 84-87 Monte SS. 86/87 KZF is 8656917 superseded to 8642965, also found in the 1984 F-body early 700 transmissions TS, YA, YN.

I'm not even going to try and keep up on this merry go-round.
 
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DoubleV

DoubleV

Royal Smart Person
Feb 25, 2011
2,135
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Medina Ohio
Chevy did have higher shift points than olds in 86-87. Olds in 83-85 OZ trans had the same shift point has the 86-87 chevy ss. Stall was the same 2400 rpm , D converter in all them SS , 442, Hurst, GN
I don't believe that's accurate. Monte SS had higher shift points than the OZ trannys. 1-2 shifts for Monte SS have always seen advertised as being around 5600 and for OZ it's around 5200.
 
84 W40

84 W40

Master Mechanic
Dec 9, 2009
373
63
I don't believe that's accurate. Monte SS had higher shift points than the OZ trannys. 1-2 shifts for Monte SS have always seen advertised as being around 5600 and for OZ it's around 5200.
I never go by what GM advertised, driven many of Monte SS when new and it would all ways shift out of first below what was advertised. We even added an aftermarket tach same results. My Hurst shifts higher than advertised almost 5500 1-2 and I used an aftermarket tach to confirm the shift. Even asked my trans guy that I have been using for 30 plus years, a very well known person that builds performance 200r4 for the GN boys , what valve body had a better shift in stock form behind a V8, his answer OZ.
 
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MrSony

MrSony

Geezer
Nov 15, 2014
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Des Moines, Iowa
Thought GN's/turbos were the only ones with 2400 stall converters?
 
DoubleV

DoubleV

Royal Smart Person
Feb 25, 2011
2,135
83
Medina Ohio
My OZ transmission shifts as WAY lower than 5500 1-2. Also, I misspoke. 1-2 shifts with OZ transmission is actually closer to 4800. Grand Nationals were around 5200 and the Montes were higher than that still. Of course if one messes with the TV cable things can change but those advertised shift points seem to jive with what I hear others with those trannys claim.
 
69hurstolds

69hurstolds

Comic Book Super Hero
Supporting Member
Jan 2, 2006
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The Monte SSs, GNs that I've driven new NEVER banged shifted like the 83-85 OZs when new. Now that said, once there was some miles on the OZ, they calmed down considerably. But in stock calibration from the factory when new, no 200-4R shifted harder from the 1-2 than the OZ. I don't give a flying flip f**k what any documentation may say otherwise, but when you actually hear the tires bark and feel your backbone snap back in the seat you don't need a spec sheet. What was odd, even at lower speeds it was unforgivingly harsh. 86/87 KZF was firm and quick, but not bone-jarring. As with all the performance G-body lineup. There was a practically new 83 H/O in the lot that a woman had traded in because the transmission shifted so hard she got rid of the car. Still, to me, one of the craziest reasons to get rid of an H/O.
 
84 W40

84 W40

Master Mechanic
Dec 9, 2009
373
63
Thought GN's/turbos were the only ones with 2400 stall converters?
Thats a myth someone started many years ago. SS, 442, Hurst and GN had the same converter D 2400 stall. Now if you are at a junk yard and come across a Caddy limo year 85-88 look at the Vin. They came with olds vin 9 motor, 2400 stall D converter and a little higher shifting vavle body than a stock 200r4. I have the code for the trans written down, just need to find it.
 

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