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Transmission Measurements

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Transmission Measurements

TH-350 (bellhousing pattern – Chevrolet, BOP, Fit-All)

Style A B C D E
6″ tail 27 11/16 21 5/8 20 3/8 3 3/4 19 1/8
9″ tail 30 11/16 21 5/8 20 3/8 3 3/4 19 1/8
12″ tail 33 27/32 21 5/8 20 3/8 3 3/4 19 1/8

 

 TH-400 (bellhousing pattern – Chevrolet, BOP)

Style A B C D E
4″ tail 28 3/8 24 5/16 26 15/16 4 1/4 20
9″ tail 33 27/32 24 5/16 27 15/16 4 1/4 20
13″ tail 37 7/8 24 5/16 27 21/32 1 3/4 20

 

 200-4R (bellhousing pattern – BOP, Fit-All)

Style A B C D E
All 27 11/16 no tailhousing 27 3 3/4 19 1/8

 

700-R4 4L60 (4L60E 1993-1995) (bellhousing pattern – Chevrolet)

Style A B C D E
All except Corvette 30 ? 23 3/8 22 1/2 3 3/4 20
Corvette (1984-1996) 29 7/8 23 3/8 22 1/2 3 3/4 20

 

4L60E 1996-Later (bellhousing pattern – Chevrolet/removable)

Style A B C D E
All except Corvette 30 3/4 21 3/4 23 3/16 3 3/4 18 1/4
Corvette (transaxle) N/A N/A

 

4L60E / 4L65E 1997-Later (w/ removable bellhousing) All LS1 Type

Style A B C D E
All except Corvette 31 5/32 21 3/4 23 19/32″ 3 3/4 18 1/4

 

4L80E 1991-Later (bellhousing pattern – Chevrolet)

Style A B C D E
Std. 2wd 32 11/16 26 30 3/8 4 1/4 20
HD 2wd 31 15/16 26 30 3/8 4 1/4 20
HD long 33 26 30 3/8 4 1/4 20
4 X 4 29 26 30 3/8 N/A 20

 

C-4 (bellhousing pattern (removable) – 4 Cylinder, Small Block, Big Block)

Style A B C D E
Pan Fill 24 5/16 16 3/4 19 1/2 5 9/16 N/A
Case Fill  30 19/32  18 1/8  20 1/2 5 9/16 N/A
CF w/ PF conv. 5 9/16 N/A

 

 C-6 (bellhousing pattern – FE Big Block, Big Block, Small Block)

Style A B C D E
FE Big Block 33 1/2 20 22 3/8 5 1/2
Big Block 33 1/2 20 22 3/8 5 1/2
Small Block 33 1/2 20 22 3/8 5 1/2

 

 AOD (bellhousing pattern – Small Block)

Style A B C D E
Small Block 30 3/8 20 3/16 22 5/16 5 5/16 19 9/16

 

 AODE (bellhousing pattern – Small Block)

Style A B C D E
Small Block 31 3/16 21 23 5/16 5 5/16 19 3/8

 

 Powerglide (bellhousing pattern – Chevrolet, Fit-all)

Style A B C D E
short shaft 25 23/64 16 5/16 20 9/16 3 3/4 19
shorty 17 15/16 16 5/16 20 9/16 N/A 19
long shaft 27 9/16 16 5/16 20 9/16 3 3/4 19

GM Transmission dimensions

Dimensions.jpg
  • Dimension “A” is the overall transmission length and varies with the length of the extension housing used.
  • Dimension “B” is the length of the main transmission case.
  • Dimension “C” is the distance from the bellhousing to the center of the transmission mounting pad.
    • Note: The mounting pad is usually part of the extension housing, but the graphic shows it on the main case. This means that dimension “C” is usually longer than dimension “B”
  • Dimension “D” is the distance between the center of the mounting bolts – this is the “width” of the mounting pad.
  • Dimension “E” is the width of the transmission at the bellhousing and combined with dimension “B”, helps you roughly compare the size of the various transmissions.
Transmission A B C D E Notes
Powerglide 25-23/64″ 16-5/16″ 20-9/16″ 3-3/4″ 19″ Short shaft
Powerglide 27-9/16″ 16-5/16″ 20-9/16″ 3-3/4″ 19″ Long shaft
TH350 27-11/16″ 21-5/8″ 20-3/8″ 3-3/4″ 19-1/8″ 6″ extension housing
TH350 30-11/16″ 21-5/8″ 20-3/8″ 3-3/4″ 19-1/8″ 9″ extension housing
TH350 33-27/32″ 21-5/8″ 20-3/8″ 3-3/4″ 19-1/8″ 12″ extension housing
TH400/3L80 28-3/8″ 24-5/16″ 26-15/16″ 4-1/4″ 20″ 4″ extension housing
TH400/3L80 33-27/32″ 24-5/16″ 27-15/16″ 4-1/4″ 20″ 9″ extension housing
TH400/3L80 37-7/8″ 24-5/16″ 27-21/32″ 1-3/4″ 20″ 13″ extension housing
TH700R4/4L60 30-3/4″ 23-3/8″ 22-1/2″ 3-3/4″ 20″ All, except Corvette
TH700R4/4L60 29-7/8″ 23-3/8″ 22-1/2″ 3-3/4″ 20″ Corvette, 1982-’92
TH700R4/4L60 29-1/2″ 23-3/8″ 22-1/2″ 3-3/4″ 20″ With TH350 6″ extension housing
TH700R4/4L60 30-1/2″ 23-3/8″ 28″ 3-3/4″ 20″ (1)Using mount on extension housing p/n 8673406 (old p/n 24214689)
TH2004R 27-11/16″ n/a 27″ 3-3/4″ 19-1/8″ Integral extension housing
4L60E 30-3/4″ 23-3/8″ 22-1/2″ 3-3/4″ 20″ All 1993-’95, except Corvette
4L60E 29-7/8″ 23-3/8″ 22-1/2″ 3-3/4″ 20″ Corvette, 1993-’95
4L60E 30-3/4″ 21-3/4″ 23-3/16″ 3-3/4″ 18-1/4″ All 1996-up, except Corvette and LS1
4L60E 31-5/32″ 21-3/4″ 23-19/32″ 3-3/4″ 18-1/4″ LS1, 1998-up
4L60E n/a n/a n/a n/a n/a Corvette transaxle, 1996-up
4L80E 32-11/16″ 26″ 30-3/8″ 4-1/4″ 20″ 1991-up, std. duty; 2WD
4L80E 31-11/16″ 26″ 30-3/8″ 4-1/4″ 20″ 1991-up, heavy duty; 2WD
4L80E 33″ 26″ 30-3/8″ 4-1/4″ 20″ 1991-up, heavy duty; Long
4L80E 29″ 26″ 30-3/8″ n/a 20″ 1991-up, 4WD
Note

(1) An extension housing p/n 8673406 (old p/n 24214689) is available for the TH700R4/4L60 transmission that moves the rear transmission mount to the same position as a TH400 (short-style 4” tail) or TH2004R transmission. This 7-3/8” long extension housing can eliminate transmission crossmember modifications when replacing a TH400 or TH2004R transmission with a 4L60 assembly.

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