Speedo Problems - TH350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

75stepside · 08-18-2005, 09:07 AM

Well, i'm in the process now of working the bugs out of my project... the first thing is my speedo... it didn't work on my maiden voyage... so i disconnected the cable and put a drilll on it.... nothing... so i took out the gauge and the cable and got it on the bench... for some reason the gauge was bad, so i put another on the cable, it worked, so i put that assembly back in.... test drive, no speedo... i pulled off and even checked that i put the cable up in the gauge... still nothing...

so, i'm guessing that the problem lies in the transmission.... any tips ? suggestions?

86 GMG · 08-18-2005, 10:40 AM

a little plastic gear is more than likely the problem mine does the same thing i havnt fixed it yet b/c i cant drive it right know it is basically the spot the cable connects to the tail shaft i dont know any more on this but its am item for you to check in to

**Captkaos** · 08-18-2005, 11:03 AM

To check it in the truck, unhook the speedo cable from the tailhousing and spin it there while hooked up to the speedo and see. It it works there, it for sure is the speedo gear in the trans. OR you can just pull the gear out and see.

Although this is a 700R4, it is generally the same procedure:
http://www.73-87.com/7387garage/drivetrain/spdgears.htm

Slonaker · 08-18-2005, 11:59 AM

You can see pics of what the parts look like in my post in this thread. Mine is a TH350C, though I doubt it is much different.

http://207.44.196.117/vboard/showthread.php3?t=169045

Slonaker

75stepside · 08-22-2005, 12:42 PM

UPDATE:

well, my truck has a 2 piece cable. i pulled BOTH pieces this time, and the piece out of the tail shaft... hooked it all together... everything seemed to work well - it all spun togehter... reinstall... nothing! so, i think i'm going to get a 1 piece cable... i'm just not convinced that its all together inside once its together... if that makes sense... the inners of the cables move in and out too easily...

any thoughts?

08-18-2005, 09:07 AM	#1
75stepside Proud Member Join Date: Nov 2002 Location: Pittsburgh, PA Posts: 741	Speedo Problems - TH350 Well, i'm in the process now of working the bugs out of my project... the first thing is my speedo... it didn't work on my maiden voyage... so i disconnected the cable and put a drilll on it.... nothing... so i took out the gauge and the cable and got it on the bench... for some reason the gauge was bad, so i put another on the cable, it worked, so i put that assembly back in.... test drive, no speedo... i pulled off and even checked that i put the cable up in the gauge... still nothing... so, i'm guessing that the problem lies in the transmission.... any tips ? suggestions?

08-18-2005, 10:40 AM	#2
86 GMG Registered User Join Date: Apr 2005 Location: Tulsa Oklahoma Posts: 943	a little plastic gear is more than likely the problem mine does the same thing i havnt fixed it yet b/c i cant drive it right know it is basically the spot the cable connects to the tail shaft i dont know any more on this but its am item for you to check in to __________________ square body trucks an addiction or an investment either way they consume all my extra time and money

08-18-2005, 11:03 AM	#3
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	To check it in the truck, unhook the speedo cable from the tailhousing and spin it there while hooked up to the speedo and see. It it works there, it for sure is the speedo gear in the trans. OR you can just pull the gear out and see. Although this is a 700R4, it is generally the same procedure: http://www.73-87.com/7387garage/drivetrain/spdgears.htm __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

08-18-2005, 11:59 AM	#4
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	You can see pics of what the parts look like in my post in this thread. Mine is a TH350C, though I doubt it is much different. http://207.44.196.117/vboard/showthread.php3?t=169045 Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

08-22-2005, 12:42 PM	#5
75stepside Proud Member Join Date: Nov 2002 Location: Pittsburgh, PA Posts: 741	UPDATE: well, my truck has a 2 piece cable. i pulled BOTH pieces this time, and the piece out of the tail shaft... hooked it all together... everything seemed to work well - it all spun togehter... reinstall... nothing! so, i think i'm going to get a 1 piece cable... i'm just not convinced that its all together inside once its together... if that makes sense... the inners of the cables move in and out too easily... any thoughts?



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