Transmission Measurements

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Transmission Measurements

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

StyleABCDE
6″ tail27 11/1621 5/820 3/83 3/419 1/8
9″ tail30 11/1621 5/820 3/83 3/419 1/8
12″ tail33 27/3221 5/820 3/83 3/419 1/8

 

 TH-400 (bellhousing pattern – Chevrolet, BOP)

StyleABCDE
4″ tail28 3/824 5/1626 15/164 1/420
9″ tail33 27/3224 5/1627 15/164 1/420
13″ tail37 7/824 5/1627 21/321 3/420

 

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

StyleABCDE
All27 11/16no tailhousing273 3/419 1/8

 

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

StyleABCDE
All except Corvette30 ?23 3/822 1/23 3/420
Corvette (1984-1996)29 7/823 3/822 1/23 3/420

 

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

StyleABCDE
All except Corvette30 3/421 3/423 3/163 3/418 1/4
Corvette (transaxle)N/AN/A

 

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

StyleABCDE
All except Corvette31 5/3221 3/423 19/32″3 3/418 1/4

 

4L80E 1991-Later (bellhousing pattern – Chevrolet)

StyleABCDE
Std. 2wd32 11/162630 3/84 1/420
HD 2wd31 15/162630 3/84 1/420
HD long332630 3/84 1/420
4 X 4292630 3/8N/A20

 

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

StyleABCDE
Pan Fill24 5/1616 3/419 1/25 9/16N/A
Case Fill 30 19/32 18 1/8 20 1/25 9/16N/A
CF w/ PF conv.5 9/16N/A

 

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

StyleABCDE
FE Big Block33 1/22022 3/85 1/2
Big Block33 1/22022 3/85 1/2
Small Block33 1/22022 3/85 1/2

 

 AOD (bellhousing pattern – Small Block)

StyleABCDE
Small Block30 3/820 3/1622 5/165 5/1619 9/16

 

 AODE (bellhousing pattern – Small Block)

StyleABCDE
Small Block31 3/162123 5/165 5/1619 3/8

 

 Powerglide (bellhousing pattern – Chevrolet, Fit-all)

StyleABCDE
short shaft25 23/6416 5/1620 9/163 3/419
shorty17 15/1616 5/1620 9/16N/A19
long shaft27 9/1616 5/1620 9/163 3/419

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.
TransmissionABCDENotes
Powerglide25-23/64″16-5/16″20-9/16″3-3/4″19″Short shaft
Powerglide27-9/16″16-5/16″20-9/16″3-3/4″19″Long shaft
TH35027-11/16″21-5/8″20-3/8″3-3/4″19-1/8″6″ extension housing
TH35030-11/16″21-5/8″20-3/8″3-3/4″19-1/8″9″ extension housing
TH35033-27/32″21-5/8″20-3/8″3-3/4″19-1/8″12″ extension housing
TH400/3L8028-3/8″24-5/16″26-15/16″4-1/4″20″4″ extension housing
TH400/3L8033-27/32″24-5/16″27-15/16″4-1/4″20″9″ extension housing
TH400/3L8037-7/8″24-5/16″27-21/32″1-3/4″20″13″ extension housing
TH700R4/4L6030-3/4″23-3/8″22-1/2″3-3/4″20″All, except Corvette
TH700R4/4L6029-7/8″23-3/8″22-1/2″3-3/4″20″Corvette, 1982-’92
TH700R4/4L6029-1/2″23-3/8″22-1/2″3-3/4″20″With TH350 6″ extension housing
TH700R4/4L6030-1/2″23-3/8″28″3-3/4″20″(1)Using mount on extension housing p/n 8673406 (old p/n 24214689)
TH2004R27-11/16″n/a27″3-3/4″19-1/8″Integral extension housing
4L60E30-3/4″23-3/8″22-1/2″3-3/4″20″All 1993-’95, except Corvette
4L60E29-7/8″23-3/8″22-1/2″3-3/4″20″Corvette, 1993-’95
4L60E30-3/4″21-3/4″23-3/16″3-3/4″18-1/4″All 1996-up, except Corvette and LS1
4L60E31-5/32″21-3/4″23-19/32″3-3/4″18-1/4″LS1, 1998-up
4L60En/an/an/an/an/aCorvette transaxle, 1996-up
4L80E32-11/16″26″30-3/8″4-1/4″20″1991-up, std. duty; 2WD
4L80E31-11/16″26″30-3/8″4-1/4″20″1991-up, heavy duty; 2WD
4L80E33″26″30-3/8″4-1/4″20″1991-up, heavy duty; Long
4L80E29″26″30-3/8″n/a20″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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