Transmission Dimensions

There are three ways to determine if that three- or four-speed automatic transmission lying on the floor of your garage will fit in your latest project: you can eyeball it, measure it, or look up the critical dimensions in this handy chart. Guess which one we recommend.

Our chart gives you the critical dimensions—overall length and bellhousing-to-transmission length—you need to know to determine if that GM, Ford, or Chrysler slushbox will fit in your chassis. As a special added bonus, we also have the gear ratios for said transmissions to help you better determine the overall gearing for your vehicle.

Once you’ve determined that the transmission will fit, take a minute to read our The Right Stall story in the Tech section to learn how to choose the right torque converter for your vehicle combination.

GM Transmissions

Type 1st
Gear
2nd
Gear
3rd
Gear
4th
Gear
Overall
Length

Bellhousing-to-
Transmission Length

TH-350

2.52

1.52

1.00

--

27 5/8"*

20 3/8"
TH-400 2.48 1.48 1.00 -- 28 1/4"+ 26 3/4"
TH-200-4R 2.74 1.57 1.00 0.67 27 3/4" 26 7/8"
TH-700-R4/4L60 3.06 1.62 1.00 0.70 23 3/8"# 22 3/8"#
4L60E 3.06 1.62 1.00 0.70 30 3/4" 22 3/8"
4L80E 2.48 1.48 1.00 0.75 31 1/2" 30 3/8"

*With 6" (short) tailhousing
+ With short tailhousing
# Except Corvette

Ford Transmissions

Type 1st
Gear
2nd
Gear
3rd
Gear
4th
Gear
Overall
Length
Bellhousing-to-
Transmission Length

C4

2.46

1.46

1.00

--

30 1/2"

20 1/4"
C6 2.46 1.46 1.00 -- 33 1/2" 22 1/2"
AOD 2.40 1.46 1.00 0.67 30 3/4" 22 1/4"
E40D 2.71 1.53 1.00 0.70 37 1/2" 29 3/8"

Chrysler Transmissions

Type 1st
Gear
2nd
Gear
3rd
Gear
4th
Gear
Overall
Length
Bellhousing-to-
Transmission Length

A904

2.74

1.54

1.00

--

30 1/2"

22 2/3"
A727 2.45 1.45 1.00 -- 34 3/8" 22 2/3"
A518/A618 2.45 1.45 1.00 0.69 36 7/8" 24"
A500 2.74 1.54 1.00 0.69 34 1/2" 24 1/2"

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