The Chevy TH-700R4 Transmission.
This thread is part of a project brought about by our administrator Jon, and the rest of the moderators here on Hotrodders.com.
This thread is meant to inform and educate about the TH-700R4 transmission.
I have thought about this and will leave this post open UNTIL the first irrevelant post I see, at which time I will lock it and all responses to this subject will need to be sent to me, Crosley, or Jon via Private Message, at which time one of us will update the thread with the supplied information.
We DO NOT want to bad mouth this transmission in this thread, just inform as best we can, everyone has an opinion, but at times some opinions just need to be kept hushed.
I have very limited experience with this particular transmission, so I will learn a few things myself.
Remember, share as much information as you can about this transmission, including pictures, diagrams, links to other sites, and text.
If anyone has a question about this subject in the future after we have deemed this thread a success in knowledge, then hopefully they will find their answer here.
Bring on the Chevrolet overdrive automatic everyone loves to hate....
I've also got quite some to learn about this transmission. My main reason for choosing one is the overdrive which will lower cruising rpm and fuel consumption.
A site with very good info is http://www.bowtieoverdrives.com
Here's the BTO installation guidelines document. Doesn't have any copyright notices on it, so I guess its OK to mirror it for the time being.
Its a bit of a Janet and John document, Doesn't actually give any decent information on pressures etc.
I had hoped I would get more attention than I have on this subject, and since I had not as of yet I am adding a few more tidbits to the thread.
The Turbo-Hydramatic (TH) 700R4 automatic overdrive transmission was introduced to Chevrolet vehicles in 1981 for the 1982 model year vehicles.
It was introduced to the larger car (B-body, and similar), and truck lines as the TH-2004R was introduced to the car line, the 200 was given a "universal" bellhousing bolt pattern for it's ability to bolt to different engines (both the Chevy and B-O-P-C engines).
The 700 came in two bellhousing bolt patterns, the standard "Chevy" which includes all smallblock engines from 262 to 400 cubic engines (and the later "Vortec" series engines and their derivitives), the big blocks from the truck only 366 to the 502, and the new ZZ572. This bellhousing pattern was also used for the 6.2 and 6.5 liter V-8 diesel engines, and it will also directly bolt up to the 3.3 liter 200 cubic inch, the 3.8 liter 229 inch V-6, and the 4.3 liter 262 cubic inch engines.
And then there was the smaller bellhousing bolt pattern used on the 2.5 liter (151") 4-cylinder, the 2.8 liter (173") V-6, and the 3.1 liter (189") V-6 engines.
[color=yellow]The TH-700R4 was never factory installed behind anything larger than the 6.5 liter diesel.[/color]
The TH-700R4 was also offered in a 2 wheel drive version AND a 4 wheel drive version- the difference here being the 2WD had a longer tailshaft and a housing including a bushing to support it along with containing a speedometer drive housing, the 4WD version had a much shorter tailshaft which was to be supported by the adapter and transfer case input shaft bearing, the 4WD speedometer was driven from within the transfer case rear output shaft housing. The only other difference I have found here is that the torque convertor cover (dust cover) for the 4WD version was made of cast aluminum instead of stamped steel or molded plastic, and it used much larger bolts to attach to the transmission, as it also made provisions to attach strut rod re-inforcement's from a bracket that mounted under the motor mounts to the lower portion of the cast aluminum dust cover.
If I wouldn't have recently sold my 1985 GMC Suburban I could have taken a couple pictures of the cast cover.
There were also a few changes made to the V-8 model 700 to give it the ability and dependability to be installed into the Chevrolet Camaro, and Corvette, and in certain cases the Corvette version received even more enhancements.
There were various differences in the same model transmissions needed to be able to be used with the different engines and the same transmission, obviously the 200 inch V-6 will have a bit of a problem driving the 700 that was designed to be bolted behind a 6.5 turbo diesel, or a big block engine.
The gearing for the 700 is:
First- 3.059, Second- 1.625, Third- 1.000, Fourth- 0.696, Reverse- 2.294. [color=yellow]OR[/color]
Rounded off to 3.06, 1.63, 1.00, .70, and 2.29.
Like I stated before the 700R4 was introduced in 1982, this transmission had a 27 spline input shaft, and many cumulative problems and bugs that had given the 700 a reputation that it wasn't reliable or desireable and it was revised to include many upgrades and changes that changed its reputation a little, it was given a 30 pline input shaft, many internal re-design modifications and deemed to be a better version.
Without pictures, the 700 can be identified by the oilpan having a rectangular shape being longer front-to-rear than side-to-side and held to the transmission by 16 bolts, 3 bolts front, 3 bolts rear, 5 bolts left side, and 5 bolts right side.
The tailshaft housing is held onto the main case by 4 bolts, and from my own experience uses a square-cut o-ring seal and not a gasket.
The typical width of this transmission where it bolts to the engine is 20 inches overall, from the engine/trans mating surface to the crossmember mount bolt is 22-1/2 inches, and engine/trans surface to output shaft housing mating surface is 23-3/8 inches overall, with the tailshaft housing typically measuring 7-5/8 inch.
Transmission fluid cooler lines: On the 700R4 the bottom fitting on the right side of the transmission is the "out" line to the cooler and the top fitting is for the return line from the cooler. These fittings are 1/4-inch pipe thread, and CAN include an adapter from the factory for threaded steel lines in an SAE size.
The transmission fluid pressure readings should be in the ranges of the following numbers (psi):
The main case is made of cast aluminum and the 700 typically weighs 155 pounds.
All versions of the 700R4 transmissions can be affordably rebuilt with stronger components in nearly every area. Additionally, shift improver kits are available to provide firmer, quicker shifts, reducing slippage, heat and clutch wear. There are also many styles of torque converter to better configure the transmission for off-road use.
In 1993, the designation of the 700R-4 changed to 4L60. A later version of this transmission, the 4L60E, is an electronically controlled variation, utilizing a reluctor ring (similar to that in an ABS application) and magnetic pickup, together called the Vehicle Speed Sensor (VSS). The transmission requires this feedback to map the shift points. In 1998 the 4L60E was re-designed to include a removeable bellhousing and a shorter main case length, along with a 6-bolt tailshaft housing as opposed to the 4-bolt earlier configuration.
Novak Conversions makes many adapters for the 700R4/pre-98 4L60E, including:
AMC inline 6 and V-8's to the TH-700R4.
TH-700R4 to the Dana models 18, 20, and 300 transfer cases, and the New Process (predacessor to New Venture Gear) NP-231.
Trans-Dapt and several others manufacture an engine-to-transmission adapter plate out of 1/8-inch sheet metal to adapt the "Chevy" bolt pattern of the TH-700R4/4L60/4L60E, to the B-O-P-C (Buick, Oldsmobile, Pontiac, & Cadillac) bolt pattern to expand the ability of this transmission to be installed behind nearly every GM engine manufactured in the past 50 years.
There are several adapters from Advance Adapters, that allow these same swaps, and a few others.
Advance Adapters also manufactures an adapter plate to mate Ford small-block engines to Chevy automatic transmissions. The kit consists of a steel adapter plate, dowel pins, torque converter spacer adapter, and mounting hardware.
There are also adapters for early Hemi's and later model Chrysler engines to be able to mount the GM automatics to them. I am still sourcing these parts.
Two very good books for the TH-700R4 are:
Several books available found on this site. http://www.atsg.biz/cgi-local/shoppe...egories=action
And the Haynes Tech Book #10360 -- GM Automatic Transmission OverHaul -- ISBN #1563921693 -- Tells how to overhaul the 350/400 and the 700R4. It has tons of pictures of the disassembly and the reassemble.
TH-700R4 website links.
These are url's to websites I have gathered information from while working on this informational thread.
The websites I visited to gain information on the TH-700R4.
This post is for the pictures of the 700R4.
TH-700R4 Identification numbers.
A diagram of the transmission pan gasket showint the orientation of the 16 bolts that hold it to the transmission main case.
The left side of a 1991 Th-700R4.
Another left side shot.
Another left side picture.
This right side pic is of an '89 and later 700R4, I will get into identifying years later. Also note the transmission RPO code MD8 toward the front of this picture.
Left side without shift lever or speedometer drive housing installed.
From front to rear:
TH-2004R (note dualbellhousing bolt pattern's).
The last one I am unsure about.
This information has been added to the Knowledge Base as a new "cluster" devoted to covering the TH-700R4 transmission.
And since the cluster is now, or very soon will be, active- I am releasing this thread to go it's course.
I feel this has no reason to be unlocked, and will not unlock it.
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