how can i tell what transmission is in my 1993 chevy 1500 z71?

Should be a 4L60.. Justa renamed 700R-4…..Check the shape of the pan and number of bolts.

http://www.yearone.com/yodnn/tech/TechFAQ/Transmis…

Chevy 1500 Z71

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RE:

how can i tell what transmission is in my 1993 chevy 1500 z71?

it is either the 700r4 or the 4l60. the difference is difficult to describe and 1993 was the last year for that trans.

700R4 / 4L60 / 4L60E / 4L65EThe 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+ ft·lb (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

Count the number on the transmission pan then call your local auto parts store and tell them how many bolts you have and they can tell you what kind of transmission you have by looking up a transmission filter with that number of bolts.

If it’s auto and has overdrive it’s a 700r4. That’s my guess as to whats in it. I doubt it’s a th400 that’s a 3 speed auto but it’s a much heavier duty tranny

You can buy a book on your truck at a auto parts store. It will tell you everything you need to know plus how to work on the truck

https://shorturl.im/avBtD

most likely a t700R4 or COULD be a 4L80E (T400 with O/D)