Description
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 3/4 | 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 |
| Dipstick Location | Flexplate Bolt Pattern | Bellhousing Depth |
|---|---|---|
| Case Fill | 10 ½” – 157 teeth | 5 7/8“ |
| Pan Fill | 11 7/16” – 164 teeth | 6 1/4“ |
| Case Fill | 11 7/16” – 164 teeth | 6 1/4“ |
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:
- 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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