Th-375 tranny - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tthornt · 10-26-2010, 01:21 AM

Hey all. I'm looking to install a th-375 in my 1983 chevy short bed. my ? is how can i convert the electric speedo to mechanical. If the conversion is do-able, can i use my mechanical speedo off of my existing th350 short tail.

Thanking your in advance.
Tony

**old Rusty C10** · 10-26-2010, 10:03 AM

maybe its just me but in all the years ive been doing this ive never heard of a th375 trans... ive heard of a th350 th400 and a 700R4 but never a th375

4LUG39 · 10-26-2010, 10:07 AM

THM375 - This transmission is a derivative of the THM400 sharing the external appearance of the 400. It'll be marked 375-THM on the bottom of the tailshaft housing. It's a light duty version of the THM400, has ABSOLUTELY NO RELATION to the THM375B, and was found in 1972 to 1976 full-size cars. The Turbo 375 was modified to accept the Turbo 350 driveshaft yoke.

THM375B - This trans is identical to the THM350, but is considered a heavier duty transmission.

I know of the trans, but I have no idea how to change the speedo.

10-26-2010, 01:21 AM	#1
tthornt Registered User Join Date: May 2008 Location: greenville Alabama Posts: 63	Th-375 tranny Hey all. I'm looking to install a th-375 in my 1983 chevy short bed. my ? is how can i convert the electric speedo to mechanical. If the conversion is do-able, can i use my mechanical speedo off of my existing th350 short tail. Thanking your in advance. Tony __________________ Country; LIKE A ROCK All that I am, I owe 62SWB-STEP 83SWB 86LWB

10-26-2010, 10:03 AM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	Re: Th-375 tranny maybe its just me but in all the years ive been doing this ive never heard of a th375 trans... ive heard of a th350 th400 and a 700R4 but never a th375 __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

10-26-2010, 10:07 AM	#3
4LUG39 Registered User Join Date: Jun 2004 Location: Bastrop,Texas Posts: 61	Re: Th-375 tranny THM375 - This transmission is a derivative of the THM400 sharing the external appearance of the 400. It'll be marked 375-THM on the bottom of the tailshaft housing. It's a light duty version of the THM400, has ABSOLUTELY NO RELATION to the THM375B, and was found in 1972 to 1976 full-size cars. The Turbo 375 was modified to accept the Turbo 350 driveshaft yoke. THM375B - This trans is identical to the THM350, but is considered a heavier duty transmission. I know of the trans, but I have no idea how to change the speedo. __________________ Ain't no way in the world I'm going out that front door. 69 SWB Fleetside 327/5spd 76 blazer 383/700R4 95 2Dr Tahoe 5.7 4x4 LT Last edited by 4LUG39; 10-26-2010 at 10:09 AM.

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