Help Quick Please.. Fire - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Scrub · 09-01-2003, 05:27 PM

I am posting this here cuz ya'll are more active than the other boards. I am trying to get my 87 K30 out on the fire here in Sisters Oregon. My Speedo doesn't work. I haven't look at it yet, but I figured someone out there probably has a good idea of the most common speedo failure. It is going into a 205 t-case. I am running into town for a bit, so I won't answer right back

Thanks in advance

**old Rusty C10** · 09-01-2003, 05:30 PM

one of three things the gear in the tranny/transfer case the cable itself or the speedo is shot pull it off at the speedo and see if it spins if not keep tracing back

Scrub · 09-01-2003, 05:50 PM

OK,
I went for the easy access and found that the cable looks brand new, but It is really hard to turn at the tcase end. How much effort should it take to spin the cable? Should it just roll in my fingers?
I am gonna go pull the dash end off, be right back

Scrub · 09-01-2003, 06:33 PM

Hmm.
at the tcase end there is a little speed changer gear box. It is not meshing up with the gear that must be driven by a radial gear on the output shaft. I need to replace both the gear and the little gear box. I have 3 other 205 t-cases. Are the gears all the same, or are they different for different rear ends?

I also have a parts truck, are there different speedos, or all of of them the same?

Thank again

**Stocker** · 09-01-2003, 07:08 PM

The cable should resist spinning somewhat, but you should be able to turn it by hand. Or chuck it into a VSR drill and run it in reverse; the speedometer should work.

My cable goes directly into the t-case, so I think the box you see is an adapter to correct the speedo reading (for different gears). Compare input rotation to output rotation to see if they are the same on your other adapters.

Good luck with the fire!

Scrub · 09-01-2003, 07:44 PM

Got it.
I pulled a driver out of a 72 and it fit. I chunked the little gear box as it was only a 2% change. My tires are off more than that.

Thanks to all

09-01-2003, 05:27 PM	#1
Scrub Collector of rusty Items Join Date: Dec 2001 Location: Sisters,Oregon USA Posts: 731	Help Quick Please.. Fire I am posting this here cuz ya'll are more active than the other boards. I am trying to get my 87 K30 out on the fire here in Sisters Oregon. My Speedo doesn't work. I haven't look at it yet, but I figured someone out there probably has a good idea of the most common speedo failure. It is going into a 205 t-case. I am running into town for a bit, so I won't answer right back Thanks in advance __________________ Scrub Sisters, Oregon - Home of the Sisters Rodeo. 70 GMC 1,000,000 + miles 72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends.

09-01-2003, 05:30 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,313	one of three things the gear in the tranny/transfer case the cable itself or the speedo is shot pull it off at the speedo and see if it spins if not keep tracing back __________________ 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!!

09-01-2003, 05:50 PM	#3
Scrub Collector of rusty Items Join Date: Dec 2001 Location: Sisters,Oregon USA Posts: 731	OK, I went for the easy access and found that the cable looks brand new, but It is really hard to turn at the tcase end. How much effort should it take to spin the cable? Should it just roll in my fingers? I am gonna go pull the dash end off, be right back __________________ Scrub Sisters, Oregon - Home of the Sisters Rodeo. 70 GMC 1,000,000 + miles 72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends.

09-01-2003, 06:33 PM	#4
Scrub Collector of rusty Items Join Date: Dec 2001 Location: Sisters,Oregon USA Posts: 731	Hmm. at the tcase end there is a little speed changer gear box. It is not meshing up with the gear that must be driven by a radial gear on the output shaft. I need to replace both the gear and the little gear box. I have 3 other 205 t-cases. Are the gears all the same, or are they different for different rear ends? I also have a parts truck, are there different speedos, or all of of them the same? Thank again __________________ Scrub Sisters, Oregon - Home of the Sisters Rodeo. 70 GMC 1,000,000 + miles 72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends.

09-01-2003, 07:08 PM	#5
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,725	The cable should resist spinning somewhat, but you should be able to turn it by hand. Or chuck it into a VSR drill and run it in reverse; the speedometer should work. My cable goes directly into the t-case, so I think the box you see is an adapter to correct the speedo reading (for different gears). Compare input rotation to output rotation to see if they are the same on your other adapters. Good luck with the fire! __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

09-01-2003, 07:44 PM	#6
Scrub Collector of rusty Items Join Date: Dec 2001 Location: Sisters,Oregon USA Posts: 731	Got it. I pulled a driver out of a 72 and it fit. I chunked the little gear box as it was only a 2% change. My tires are off more than that. Thanks to all __________________ Scrub Sisters, Oregon - Home of the Sisters Rodeo. 70 GMC 1,000,000 + miles 72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends.

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