GM Tranny Bolt Patterns
Terryk
terryk at foothill.net
Thu Dec 18 03:18:40 GMT 1997
Great info, now how about the manual FWD transmissions?
TK
----------
> From: Steve Ochs <Steve_Ochs at compuserve.com>
> To: INTERNET:diy_efi at esl.eng.ohio-state.edu
> Subject: GM Tranny Bolt Patterns
> Date: Wednesday, December 17, 1997 6:00 PM
>
> Message text written by INTERNET:diy_efi at esl.eng.ohio-state.edu
> >Anybody know if the 3.8L Buick FWD engine and the 2.8L/3.1L/3.4L Chevy
FWD
> > share the same bellhousing pattern? I thought so originally until I
found
> > out that the Quad 4 and the 2.8L are different. So maybe the Buick is
> > different too.
> ><
>
> Boy, gone from the digest for two days and I miss a lot!!! I wish I
could
> have gotten into this discussion earlier.
>
> Here is the scoop:
>
> Rear Wheel Drive -
> There are two bolt patterns made, Chevy and BOP (Buick-Olds-Pontiac)
> Some transmissions came in both, some in Chevy only.
> The 700-R4/4L60/4L60-E came in Chevy ONLY until 1995 when the split case
> became avaialble. All BOP applications used the THM-200-R4, THM-200,
> THM-250, or THM-350 until those trannys were discontinued (last was
200-R4
> in 1990). That is why 3800 was not available in Camaro/Firebird until
> 1995. In order to be more flexible including outside customers, a
2-piece
> case was designed for the 4L60-E. The transmission housing is the same
but
> the bellhousing can be replaced with different versions (like a manual
> tranny).
> All Chevy truck engines mated to the 700-R4/4L60/4L60-E (including 2.8L
> V-6, 4.3L V-6, & All V-8s) have the Chevy bolt pattern. No adapters have
> ever been used with the 700-R4 tranny.
>
> Front Wheel Drive -
> ALL transverse FWD Automatic trannys have the SAME bolt pattern EXCEPT
for
> the 4T80-E which is used exclusively on the Northstar V-8s. There have
> only been THREE FWD transverse transmissions made for all applications
> other than Northstar
>
> The first was the THM-125 which is now known as the 3T40 (3-speed
> auutomatic).
>
> The second which is basically a beefed up O.D. version of the 3T40 is the
> THM-440-T4which has evolved into the 4T60, the 4T60-E, and the 4T65-E.
>
> The third is the newer 4T40-E which is a O.D. 3T40.
>
> All of these models all have the same mounting bolt pattern. I don't
have
> my manual near me but unless the engines were made with a different bolt
> pattern, the Getrag should have the same pattern. It is possible the
> engines (such as the Quad 4) were made with a dual pattern, but the
> Automatic version of the Quad 4 is the same as the V6s.
>
> The following is a list of GM FWD transmissions
> and their applications:
>
> Model Years Current Application
> --------------- ------------ ---------------------
> THM125-C (3T40) 1979-2002 J (possibly to 2002)
> 4T40-E 1995-future J,N,P-90
> THM-440T4 (4T60) 1984-1990 None
> 4T60-E 1988-1999 W,U,H
> 4T65-E 1997-future W,U,C,H,G
> 4T80-E 1992-2002 Northstar
>
> The following is a list of many of GM trannys over the years and
their
> torque capacities, etc.
>
> |--------Maximum-------|
> Engine Gearbox Gross Torque
> Overall
> Transmission Weight Torque Torque Veh. Wt. Conv. Dia.
> Length
> Model (lbs.) (lb/ft) (lb/ft) (lbs) (inches)
> (inches)
> Rear Wheel Drive:
> TH-180C (3L30) 130/140 258 440 7716 9.6/10.24
> 26.29/28.11
> TH-200-4R 157 330 550 6000 11.73
28.26
> TH-400 (3L80) 190 440 885 12000 12.20
> 29.30/34.48
> TH-700-R4 (4L60) 167/184 350 650 8600 9.6/11.73
> 29.77/30.64
> 4L30-E 168/177 258 440 7716 9.6/10.24
> 28.54/31.57
> 4L60-E 160/176 350 612 8600 9.6/11.73
> 29.77/30.64
> 4L80-E 260 440 885 15000 12.20
> 31.93/33.02
>
> Front Wheel Drive:
> TH-125C (3T40) 161 200 416 5100 9.64
> TH-440-T4 (4T60) 195 235 369 5181 9.64
> 4T60-E 203 280 390 6400 9.64
> 4T65-E 214 285 400 6400 9.64/10.16
> 4T80-E 295 305 461 6800 10.43
>
> Here are some common tranmission gear ratios:
>
> Transmission
> Model First Second Third Fourth Reverse
> Rear Wheel Drive:
> TH-180C (3L30) 2.400 1.479 1.000 --- 2.000
> TH-200-4R 2.741 1.568 1.000 0.674 2.067
> TH-350 2.52 1.52 1.00 ---
> TH-400 (3L80) 2.482 1.482 1.000 --- 2.077
> TH-700-R4 (4L60) 3.059 1.625 1.000 0.696 2.294
> 4L30-E 2.400 1.479 1.000 0.723 2.000
> 4L30-E Optional 2.860 1.620 1.000 0.723 2.000
> 4L60-E 3.059 1.625 1.000 0.696 2.294
> 4L80-E 2.482 1.482 1.000 0.750 2.077
>
> Front Wheel Drive:
> TH-125C (3T40) 2.840 1.600 1.000 --- 2.067
> TH-440-T4 (4T60) 2.921 1.568 1.000 0.705 2.385
> 4T60-E 2.921 1.568 1.000 0.705 2.385
> 4T65-E 2.921 1.568 1.000 0.705 2.385
> 4T80-E 2.960 1.626 1.000 0.681 2.130
>
> Steve Ochs aka N8TYS- Mfg. Engineer - GM Powertrain - Parma Plant
> Transmission Division (4T60/65-E) - Steve_Ochs at compuserve.com
> The statements and opinions expressed here are NOT an official
> statement of General Motors or the GM Powertrain Division
>
> '97 Chevy Blazer LT 4x4 4.3L V6 '96 DCM Impala SS 5.7L V8
> '87 Olds Cutlass 442 307 V8 '61 GMC 1500 Fleetside 305 V6
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