Identify Your Transmission

Lightweight, simple, and durable—favored in drag racing and vintage GM applications. Verify case length and tailhousing for swaps.

Compact 3-speed used in smaller GM cars. For upgrades or overdrive swaps, consider 200-4R or 700R4 families.

Popular overdrive swap with multi-pattern bellhousing. Great for G-body builds and highway drivability.

Classic 3-speed workhorse. Identify vs TH400 by pan shape and case size; 350C adds lockup converter.

High-torque 3-speed used in trucks and performance builds. Distinctive angled pan corner and larger case than TH350.

Mechanical (TV cable) early units vs electronically controlled 4L60E. Crossmember, wiring, and converter changes are required when mixing generations.

Big-power overdrive derived from TH400 architecture. Requires appropriate controller in carb swaps.

Often confused with 4L60E. If you’re asking “what transmission do I have?” and it’s a late-model GM 4-speed, 4L60E vs 4L65E is one of the most common checks we confirm.

An evolution within the 4L60E family. If your GM truck is newer than the typical 4L60E years but still a 4-speed, 4L70E is a frequent match.

If you’re chasing “what transmission do I have” on a GM van/HD platform and it’s a 4-speed, the 4L75E is a top candidate we verify.

One of the most searched modern GM units. If you have a late-model Silverado/Sierra, Tahoe/Yukon, or similar, 6L80E is frequently the answer to “what transmission do I have?”

If your GM is a heavier platform (or you’re towing hard) and it’s a 6-speed, we’ll often be confirming 6L80E vs 6L90E with your year, engine, and build data.

If you’re identifying a newer GM and it’s not a 6-speed, 8L90E is a frequent match. VIN/build confirmation is the fastest way to be sure.

For newer GM 1500 platforms, “what transmission do I have?” often comes down to 8-speed vs 10-speed. VIN/build data makes this a quick yes/no.

If you’re identifying a Duramax-era HD platform and asking “what transmission do I have?”, Allison 1000 is a top match we can confirm quickly with VIN/build info.

Light, efficient 3-speed commonly used in classic Mustangs and small-block Fords.

Early Ford 4-speed OD common to Rangers/Explorers. Consider later 4R families for heavier use.

Legendary strength for big-block and truck applications; pan is nearly rectangular with a notch.

AOD uses TV linkage; AODE/4R70W are electronically controlled with stronger internals and wider ratios (’96+).

Truck-grade OD derived from C6 with electronic control. 4R100 is the later evolution.

If you’re Googling “what transmission do I have?” for a Super Duty-era Ford, 4R100 is one of the fastest VIN/build confirmations we do.

Often searched as “TorqShift.” If your Ford is a Super Duty work truck and you’re trying to identify the transmission, 5R110 is a frequent match.

If you have a Ford truck/SUV and it’s not a 4-speed, 6R80 is a top “what transmission do I have” result we confirm quickly with VIN/build data.

For Super Duty platforms, 6R140 is one of the most common identifications we do when customers ask “what transmission do I have?”

If you’re searching “what transmission do I have” for a newer F-150 / Mustang platform, 10R80 is one of the top matches we can confirm quickly.

Light-duty 3-speed used widely across Mopar cars and small V8/V6 applications.

TorqueFlite legend—robust 3-speed for high-torque big-block and truck use.

Overdrive evolution of 904 family; RH = hydraulic/lockup, RE = electronic control.

Big-torque OD units for trucks/SUVs (e.g., Ram). Verify RH/RE control type for swaps.

If you’re identifying a Dodge/Ram and it’s a 4-speed OD in the 46/47/48 family, VIN/build details quickly narrow the exact match.

One of the most searched Dodge IDs. If you’re asking “what transmission do I have” on a Cummins-era truck, 47RE is a top candidate we verify.

If your Dodge/Ram is in the later 4-speed OD range, 48RE is a frequent answer to “what transmission do I have?”—VIN/build confirms it quickly.

If you’re trying to figure out “what transmission do I have” in a Dodge/Jeep platform, RFE identification is usually quickest via VIN/build info plus connector/sensor checks.

If you have a newer gas Ram platform and you’re asking “what transmission do I have?”, 66RFE is one of the most common confirmations we do.

One of the most searched diesel IDs. If you’re asking “what transmission do I have” on a 6.7L Cummins truck, 68RFE is usually the first thing we confirm.

If your Ram is a higher-GVWR work truck and you’re trying to identify the transmission, the Aisin AS69RC is the common “Aisin vs 68RFE” confirmation we make from VIN/build and package data.

Step 1: Confirm year/make/model/engine (this narrows families fast).
Step 2: Count forward gears (4 vs 6 vs 8 vs 10).
Step 3: Check the case connector (location/shape) and pan shape (outline + bolt count).
Step 4: Use VIN/build codes or case tag to confirm the exact model (best for 4L60E-family, 6L80/6L90, 8/10-speeds, RFEs, Aisin).

For modern platforms, the cleanest way to answer “what transmission do I have?” is VIN/build data. Pair that with one clear photo of the pan and one of the connector side of the case and you’ll eliminate look-alike confusion (especially 4L60E-family, 6L80E vs 6L90E, 6R80 vs 10R80, 68RFE vs Aisin).

Names usually tell you gear count (4/6/8/10) and family/orientation. Example: 4L60E is a 4-speed, longitudinal family, electronically controlled. 6L80 is a 6-speed family. 10R80 is Ford’s 10-speed family. Use the name as a starting point—then confirm by VIN/build or physical cues before ordering.

Two transmissions can look similar but use different sensors, connectors, converters, flexplates, or programming. If you’re asking “what transmission do I have?” before buying, you’re doing it right. Confirm first—then shop with confidence (and avoid downtime).