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Old 04-11-2011, 09:51 AM
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4l60. ?

Hey, my name is J.D. I live near Valley Falls, Kansas. I had a 56' chevy 2dr hardtop for twenty years and a bunch of 72' chevy pickups, among other things! I am helping a good friend right now on a 49' chevy school bus. He bought the bus and started work on it several years ago for his handicapped daughter. She has cerebral palsy and the school district and transportation to school for her was not acceptable so he is building her her own bus. My friend is a good man and one of the best metal fabricators I know and he has to make a living to support his family so the bus has been a slow project. He's fired up again and has a renewed energy on it. His daughter is 18 now and life expectancy is only 21 in most cases!
The reason I came to this site was to research information on the 4L60 transmission made between 90 and 92. And we heard it's a good candidate for our needs.
The bus has a 14 bolt corporate that's been narrowed and air bagged. All the mounts and design were by my friend. We plan on narrowing the front end also and with the air bags down it will sit about an inch from the rear bumper to the ground. He also chopped 7 inches out of the top. It has a fold out ramp for her wheelchair inside the back door and chocks to lock it down.
Anyway that's just a brief bit of information about me and my buddy.
I would appreciate any info on the transmission. I've located one from a 92' chevy but my yard man swears it's a 700r4 and has never heard of a 4L60 that wasn't an E with the electronic shift? We could also use some various parts and pieces for a 49'. Thanks much!! J.D.

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Old 04-11-2011, 10:28 AM
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here is some info I got off the web. maybe it will help. there are lots of guys on here that are tranny guys. i'm not that up on them myself. post your thing in the trans section and somebody knowledgable will surely get back to you. these guys are awesome.
hope it helps

The Hydramatic 700R4 was introduced in 1982 for use in Chevrolet/GMC vehicles.

In 1990, the 700R4 was renamed the 4L60. Under the new designation, the "4" stands for the number of forward gears, the "L" for longitudinal applications (rear-wheel-drive), and the "60" relates to the relative torque capacity.

1992 was the last year of widespread usage of the 700R4 (4L60).

1993 Camaro, Corvette and Typhoon were equipped with the last production 700R4's. The last design change of the 700R4 was an added checkball to the valve body.

In 1992 electronic controls were added, and it became the 4L60-E. The 4L60E went into service in trucks, vans, and SUVs in 1993 (for the record, some HD trucks had the 4L60) and in all RWD passenger cars (Corvette, F and B/D bodies) in 1994.

In 2001, an updated version the 4L65-E, was introduced. Five-pinion planetaries, along with a strength-improved output shaft, were improved to withstand the 300+ ftlb (400+ N·m) of torque of the 6.0 Vortec engine.

[edit] 700R4 / 4L60 / 4L60E / 4L65E / Technical DescriptionThe 700R4 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: three bolts front and rear; five bolts left and right sides.

The tailshaft housing is held onto the main case by four bolts (the bolt spacing is similar to the THM350), and 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 in (51 cm) overall. From the engine/trans mating surface to the crossmember mount bolt is 22.5 in (57 cm), and engine/trans surface to output shaft housing mating surface is 23.375 in (59.37 cm) overall, with the tailshaft housing typically measuring 7.625 in (193.7 mm).

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 .25 in (6.4 mm) pipe thread, and CAN include an adapter from the factory for threaded steel lines in a SAE size. 4L60Es manufactured after 1995 use the modern-day snap-in connections as opposed to threaded SAE fittings.

The original version of the transmission had a 27-spline input shaft which was a common failure point. In 1984, 700R4's designed for use behind Chevrolet small block V8's received a 30-spline input shaft similar to those found on classic TH400 transmissions and which also used a different torque converter than its 2.8 V6 and 2.2 L4 powerplants. Between 1984-1987, internal components, from the ring gear to the oil pump housing, were updated, ending with the auxiliary valve body (for 700s manufactured after October 1986).

In 1995, the 4L60E received a PWM-controlled lockup converter. 1994 fullsize chevy trucks have been seen with PWM; Late year 1994s are equipped with PWM (referred to as model year 1995). Only for sure way to know is pull the transmission out and PWM will be stamped into the front of the transmission below the input shaft.

In 1999, GM introduced a redsigned 4l60E tranmission case that incorporated a bolt-on bellhousing and an 6 bolt tailhousing. The 1999 and up model 4l60Es are referred to Late-model 4L60Es, and the 1993-1998 are referred to as the Early-model 4L60E. Both transmissions are essentially the same internally with only minor modifications. The Early-model and Late-model 4L60Es are not interchangeable.

The gearing for the 700 is:

First - 3.059:1.0
Second - 1.625:1.0
Third - 1.000:1.0
Fourth - 0.696:1.0
Reverse - 2.294:1.0
(commonly rounded off to 3.06, 1.63, 1.00, 0.70, and 2.29).

[edit] 700R4 / 4L60 / 4L60E / 4L65E Applications[2][3]

1982 Chevrolet Blazer/GMC Jimmy
1982-2005 Chevrolet Corvette
1982-1996 Chevrolet Caprice
1983-2002 Chevrolet Camaro/Pontiac Firebird
1985-2005 Chevrolet Astro/GMC Safari
1991-1992 GMC Syclone
1989-2003 Chevrolet S-10/GMC S-15/Sonoma
1989-2005 Chevrolet S-10 Blazer
1989-2001 GMC S-15 Jimmy
1990-1996 RWD Cadillac Fleetwood/Cadillac Brougham/Cadillac Limo
2002-2009 Chevrolet TrailBlazer/GMC Envoy
1992-1993 GMC Typhoon
1984-2003 Chevrolet Suburban
1993-2003 Chevrolet Van
1994-1996 Chevrolet Impala
1994-1996 Buick Roadmaster
1995-2003 Chevrolet C/K
1995-2003 Chevrolet Tahoe/GMC Yukon
1999- Cadillac Escalade
2002- Chevrolet Avalanche
2004- Hummer H2
2004-2007 Buick Rainier
2004- Chevrolet Colorado//GMC Canyon
1988-2006 Holden Commodore
2004-2006 Pontiac GTO
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Old 04-11-2011, 11:08 AM
richard stewart 3rd's Avatar
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Welcome to Hotrodders.com Glad to have you with us

Some who work at a salvage/junk yard are like walking Hollander books,
others only know what they've heard in someone else's conversations.

dsraven has given the history on this trans, is there anything else?

For the various parts & pieces for the 49 check our classifieds
& Craigslist. Reading Pa & Philadelphia had ads for parts last week
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Old 04-11-2011, 03:18 PM
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Welcome to the site, this needs to be in the transmission section.

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Old 04-11-2011, 05:13 PM
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Any idea how much the Bus will weigh when finished?
A 700R4 Trans will need a good HD build to be reliable.
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