GM Transmission Dimensions

  A B C D D E F G H
Trans Model
Bell Housing
Main Case
Case Extension
 Length to Flange Length to Shaft Engine Block to Converter Lug Length to Extension Housing Engine Block to Mount Center Line to Bottom Pan
4L60/70 2WD 6.941 15.421 8.909 N/A 30.975 0.853 31.272 24.331 7.82
4L60/70 4WD 6.941 15.421 4.433 N/A 26.941 0.853 26.795 24.353 7.82
4L80 No separate
bell housing		 26.01 5.495 29.00 (4WD) 32.1745 (2WD) 0.893 31.505 30.672 7.8
6L80 Fixed Yoke
 6.74 16.468 3.49 27.815 29.089 0.853 26.699 N/A 9.196
6L80 Slip Yoke 6.74 16.468 5.87 N/A 29.962 0.853 30.85 25.595 9.196
6L80 4WD 6.74 16.468 3.587 N/A 26.968 0.853 26.795 25.409 9.196
6L90 2WD 6.74 17.84 5.629 N/A 31.439 0.853 30.542 27.48 9.196
6L90 4WD 6.74 17.84 N/A 28.559 28.559 0.853 N/A N/A 9.196
8L90 2WD
Slip Yoke		 N/A N/A N/A N/A 29.002 0.852 26.795 25.365 8.891

 

 Powerglide (bellhousing pattern - Chevrolet, Fit-all)

Style A B C D E
short shaft 25 23/64 20 9/16 16 5/16 3 ¾ 19
TCI shorty 17 15/16 20 9/16 16 5/16 N/A 19
long shaft 27 9/16 20 9/16 16 5/16 3 ¾ 19

 TH350 (bellhousing pattern - Chevrolet, BOP, Fit-All)

Style A B C D E
6" tailshaft 27 11/16 21 5/8 20 3/8 3 ¾ 19 1/8
9" tailshaft 30 11/16 21 5/8 20 3/8 3 ¾ 19 1/8
12" tailshaft 33 27/32 21 5/8 20 3/8 3 ¾ 19 1/8

 TH400 (bellhousing pattern - Chevrolet, BOP)

Style A B C D E
C tailshaft 28 3/8 26 15/16 24 5/16 4 ¼ 20
D tailshaft 33 27/32 27 15/16 24 5/16 4 ¼ 20
13" tailshaft 37 7/8 27 21/32 24 5/16 1 ¾ 20

 2004R (bellhousing pattern - BOP, Fit-All)

Style A B C D E
All 27 11/16 integral tailhousing 27 3 ¾ 19 1/8

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

Style A B C D E
All except Corvette 30 ¾ 23 3/8 22 ½ 3 ¾ 20
Corvette (1982-1996) 29 7/8 23 3/8 22 ½ 3 ¾ 20

 4L60E/4L65E 1996-Later (bellhousing pattern - Chevrolet/removable)

Style A B C D E
All except Corvette & LS1/LS2 30 ¾ 23 3/16 21 ¾ 3 ¾ 18 ¼
Corvette (transaxle) — — — — —
LS1/LS2-style (1998-later) 31 5/32 23 19/32 21 ¾ 3 ¾ 18 ¼

 4L80E/4L85E 1991-Later (bellhousing pattern - Chevrolet)

Style A B C D E
Std. 2wd 32 11/16 30 3/8 26 4 ¼ 20
HD 2wd 31 15/16 30 3/8 26 4 ¼ 20
HD long 33 30 3/8 26 4 ¼ 20
4 X 4 29 30 3/8 26 N/A 20

 C4 (bellhousing pattern (removable) - 4 Cylinder, Small Block, Big Block)

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

 C6 (bellhousing pattern - FE Big Block, Big Block, Small Block)

Style A B C D E
FE Big Block 33 ½ 22 3/8 20 5 ½ —
Big Block 33 ½ 22 3/8 20 5 ½ —
Small Block 33 ½ 22 3/8 20 5 ½ —

 AOD (bellhousing pattern - Small Block)

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

 AODE/4R70W (bellhousing pattern - Small Block, Modular)

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

 5R55S

Style A B C D E
Small Block 281/8 253/4 2411/16 N/A 1-Hole / 1-Bolt 183/4

 A-727/37RH

Style A B C D E
Small Block 34 3/8 23 ¾ 16 2 ¾ 18
Big Block 34 ½ 22 ¾ 16 2 ¾ 18 13/16

 A-904/32RH

Style A B C D E
Small Block 30 ¾ 23 14 2 3/16 17 7/8

 

 A-518/46RH/47RH/47RE

Style A B C D E
Small Block — — 16 — 16 5/16

 A-500/42RH/42RE

Style A B C D E
Small Block 37 24 ½ 15 7/8 3 5/8 18 1/8