I need help.Dont know exactly what it is called.I have a 69 munci .The speedometer housing is broke,It does not look like ones i have seen.It hangs out like an L shape tube then the speedometer cable attaches to it.I would like to fix itbefore i put it back in my GS and i would need new speedo cable for 4 speed Left side of trans.Little longer than others?Thanks For any help John : :3gears: :
Are you sure it isnt a ratio adapter your looking at? Some GS's had a little adapter in between the trans and the speedo cable to make the speedo read correctly. Does it happen say Stewart Warner on it? Pic might help to ID it Jason
John, Does it look like this photo? If it does it is just a right-angle adaptor. With the adapter you can use a shorter speedometer cable. If you remove the gear box you need to get a longer cable. Y/O sells both cables. If you use the longer cable you will need to support it using the lower bolts on the bellhousing. Brian
Jason, I think you're correct. I never checked it before. It is close to 1:1 but not exact. I always thought is had a ratio of 1:1. I pulled it out of a wrecking yard and never used it. Brian
69 munci speedo assembly? I believe that is it in pic.,is there a place that sells them?Thank you guys.John
The ratio is usually inscribed someplace on it. Its usually something like 1.457. There are all different ones. The one I have on my 70 is a straight type that is mounted under the bellhousing. You can find them on Ebay once in a while but to find one with the correct ratio is going to be difficult at best. Jason
I think that that part is a 1:1 right angle adapter. Hey Brian, want to sell that thing? I have had an ongoing issue with my 5 speed, because, strangely enough, my trans speedometer output in on the pass side!
I believe that is it in pic.,is there a place that sells them?Thank you guys.John John, i live near the san francisco bay in cal...... there's a place here that does superb speedo/tach/clock work i dont know if they sell new or rebuilt stuff but i know they can correctly recalibrate speedo stuff to compensate for a trans, gear, or tire swap. Palo Alto Speedometer Service :TU: :TU: http://www.paspeedo.com/
John, I would think it is easier to put the correct gears in the trans, and do away with the reducer. All you need to know is the number of teeth on the drive gear(locted on the output shaft), your tire size(tire height), and rear axle ratio. Take a look at this site. It has a calculator. If you plug in your info, it will tell you what size driven gear you need. http://www.tciauto.com/tech_info/speedo_gears.htm
I have a source for new right angle gearboxes for the muncie, can be had in any ratio. This allows the stock speedo cable to be used. Cost is about $80 Cdn
Reg Thompson- SunBuick I need an adapter for my frame-off nut/bolt restoration of my 70' F-85 W-31 4 speed car. Please provide contact for obtaining one, thanks.
I get a modern right angle adapter up here from a specialty speedometer shop. It permits the original speedo cable to be reused and they were used by GM as well on many muncies. It is also another way to do a speedometer correction. On my last car I simply used a longer speedo cable - it works fine and is much cheaper.
The 90 degree speedo "adaptors" were oem on a wide range of GM vehicles from the mid '60's up into the early 80's, ie, some 4 wheel drive pickups, & even some mid 70's econo junkers (think light duty BW 5speed) used some ratio of adaptor. In many GM musclecars, with really low gears, or moderately low gears & really short tires, these speedo adaptors" were standard equipment. Today, even having the correct height rear tires, & correct original ratio adaptor may not get the speedo to register right. One has to realize, original M21's or M22's in front of really low ratio r/e's often had a 6 tooth drive gear on the tailshaft of the original Muncie. Today, what is in one's M21 or M22... which is often not original? Very seldom a 6 tooth drive gear... but a 7 or 8 tooth version. 6 tooth drive gears have been disco'ed for many years, so one will often have to use a non stock combination of drive gear, driven gear, & usually a different ratio adaptor to get the speedo to read correctly. Back in the late 70's-early 80's it was somewhat common to find these adaptors regeared to 50%. Known as "half speed adaptors", one could install one & keep half the miles off ones vehicle :Brow: Over the years, the stock ratio adaptors I've run across have ranged from .8333 to close to aprox 1.200 in ratio. Hope this helps. :3gears: Roger
