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#1 |
go bucks!
Join Date: Jan 2002
Location: MIAMISBURG OHIO USA
Posts: 803
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speedo gear in tranny?
put in a brand new speedometer,new speedo cbl.,checked the gear beside the cbl.input at the tranny for gear wear.still the speedo. doesn't work,except at high speed,and then all it reads is 15-25mph intermittently.doesn't the speedo gear mesh w/the output shaft gear to turn the speedo gear and on to the speedo cbl.?? what gives here?is not the 2 gears meshing together properly,or does this make any sense at all!?!thanks,guys!
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'68 swb 1/2t 350/350th '86 lngbd 3/4 TON parts getter '49 gmc 1/2 t 5 window 350/350th '96 gmc sonoma sle ext-cab. hey it's a 4cyl. 5 spd and good on gas y'know? |
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#2 |
Account Suspended
Join Date: May 2000
Location: IL
Posts: 0
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is probably cable engagement or speedo unit problem, unless you have way wrong diameter of gears in the tailshaft of tranny.. but if that was the case then you would think the speedo neede would ever move at all ever.,
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#3 |
Account Suspended
Join Date: May 2002
Location: Olathe, Kansas
Posts: 929
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Remove the cable from the transmission then chuck a drill (brill
![]() If you can get the speedo to respond smoothly, now its time to find out what gear is causing the trouble. Install the cable at the trans, unhook it at the speedo then either jack up the rear wheels or drive it around the block. Feel for catches or no drive at all. If the cable feels ok and the driven gear looks ok (not dished out) then you need to take a VERY good look at the drive gear. It can wear evenly and appear to be ok when in fact its not tall enough to contact the driven gear. Also check for excessive tailshaft/drive shaft movement. |
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#4 |
go bucks!
Join Date: Jan 2002
Location: MIAMISBURG OHIO USA
Posts: 803
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i have a brand new speedo head unit from pauls,so i'd think it wouldn't be that. it sounds kinda goofy but when you attach the drill(brill!!lol) what is the normal forward motion to drive the speedo unit ?would that be clock-wise w/ the drill or counter-clockwise?thanks,buxman66.
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'68 swb 1/2t 350/350th '86 lngbd 3/4 TON parts getter '49 gmc 1/2 t 5 window 350/350th '96 gmc sonoma sle ext-cab. hey it's a 4cyl. 5 spd and good on gas y'know? |
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#5 |
go bucks!
Join Date: Jan 2002
Location: MIAMISBURG OHIO USA
Posts: 803
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imho,i think the speedo gear is not tall enuff to contact the drive shaft gear.how do i replace/remedy this?(short of taking it to the tranny shop and puttin' it up on the lift)??
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__________________
'68 swb 1/2t 350/350th '86 lngbd 3/4 TON parts getter '49 gmc 1/2 t 5 window 350/350th '96 gmc sonoma sle ext-cab. hey it's a 4cyl. 5 spd and good on gas y'know? |
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#6 |
"Ochre Ogre"
Join Date: Apr 2000
Location: Springfield, MN
Posts: 3,558
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Is it possible that somebody changed out the gears without changing the retaining plate? If you take the cover off of your speedo driven gear it will have a number range on it. The last one I looked at was 40-42. That means it is to be used with a gear that has 40, 41, or 42 teeth on it. If you tried a 36 tooth gear in there it wouldn't be positioned correctly to engage the drive gear.
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Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087 |
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#7 |
go bucks!
Join Date: Jan 2002
Location: MIAMISBURG OHIO USA
Posts: 803
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thanks,burb i'll check on that. 'preceiate the input!buxman66.
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