Which Transmission do I have? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cam · 07-19-2003, 04:42 PM

I know this is probably a silly question, but can someone please tell me which automatic transmission I have in my pickup?

1975 K10 350

In the glove box the transmission is listed as "1M40" is this a 350 or 400 turbo hydromatic?

Thanks for your Help!

**swervin ervin** · 07-19-2003, 04:54 PM

Here are the pan shapes to help in identification.

cam · 07-19-2003, 04:57 PM

Thanks Mike, you have any idea what "1N41 Variable Ratio Power" is?

TIMSPEED · 07-19-2003, 07:40 PM

I'm sure all those numbers probably have to do with the transfer case.

BigRed · 07-19-2003, 09:38 PM

According to this website, it's a TH400. ---> http://www.geocities.com/MotorCity/G.../chevrolet.htm

ElGracho · 07-21-2003, 01:00 AM

N41 - Variable Ratio Power Steering.

M40 - in my 1975 GMC Gentleman Jim, (C15) it means TH350, check your pan like Mike said. I'd bet its a 350 though, not a TH400.

07-19-2003, 04:42 PM	#1
cam Registered User Join Date: May 2002 Location: Helena, MT, USA Posts: 64	Which Transmission do I have? I know this is probably a silly question, but can someone please tell me which automatic transmission I have in my pickup? 1975 K10 350 In the glove box the transmission is listed as "1M40" is this a 350 or 400 turbo hydromatic? Thanks for your Help! __________________ 1970 GMC 1/2 ton 307 4spd 1970 dorF dump runner

07-19-2003, 04:54 PM	#2
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Here are the pan shapes to help in identification. __________________ Mike 1985 Chevy C-10

07-19-2003, 04:57 PM	#3
cam Registered User Join Date: May 2002 Location: Helena, MT, USA Posts: 64	Thanks Mike, you have any idea what "1N41 Variable Ratio Power" is? __________________ 1970 GMC 1/2 ton 307 4spd 1970 dorF dump runner

07-19-2003, 07:40 PM	#4
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	I'm sure all those numbers probably have to do with the transfer case. __________________ I have a few cars... See Them Here

07-19-2003, 09:38 PM	#5
BigRed Registered User Join Date: Jun 2002 Location: DFW, TX Posts: 1,680	According to this website, it's a TH400. ---> http://www.geocities.com/MotorCity/G.../chevrolet.htm __________________ Scott Shelbourne

07-21-2003, 01:00 AM	#6
ElGracho Gentleman Jim Driver Join Date: Nov 2002 Location: Poulsbo, WA Posts: 1,553	N41 - Variable Ratio Power Steering. M40 - in my 1975 GMC Gentleman Jim, (C15) it means TH350, check your pan like Mike said. I'd bet its a 350 though, not a TH400. __________________ Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed



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