Help please!

I re-geared my M20/4 spd from red to yellow and it worked just fine. right on the money for speed w/GPS. then stopped working after a week or so. looks like the gear inside the transmission broke free somehow. How hard is it to replace or reseat that gear assembly? (speedometer drive gear) special tools? tricky little need-to-know stuff that your average Joe would miss? or is it a complete teardown? Transmission works perfectly, dreading even messing with it!

thanks for any advice.


project car for my son in Afghanistan. next up is installing a heater and a/c unit. he thinks he can daily drive without it. think he may have forgot daily drivers NEED defrost in the winter, at least in the north...chuckle.. and if I'm installing a full heat system, why not do it right with a/c... thank god they left the wiring when they gutted the heater system! (or it looks like they did)

anyway, thanks for advice on transmission.

 

Not hard to fix, once you're inside there. You need to drop the driveshaft, remove the driven speedo gear, and unbolt & remove the tail housing. The drive gear is held onto the output shaft with a little spring clip, and they sometimes snap, allowing the gear to slide back. Hate when that happens!

 

thank you for the fast reply! follow-up questions if you don't mind:

- are there different size speedometer gears inside tailshaft aea? as the yellow is bigger than the red I pulled out, maybe it slid the interior gear out of the way becuase I needed to change the interior gear as a matched set?

- where would you buy new gaskets/gear/retaining hardware. I only want to do this nasty/stinky job once and complete in one day. 90 wt stinks worse than anything I know on the car.

- can it be done with transmission bolted up? just slip if off after removing shifter/driveshaft? you make it sound like its pretty simple to figure out retaining hardware.

- can't afford it, but this thing is in dire need of a stronger/5 spd setup. ...I'll just preach to the boy to baby it and be "all show" and never dump on it full steam, avoid the 'big torque". this 454 is pretty stout. figure the odds, he's a marine climbing the mountains right now eating nasty food and chasing dirtbags, he'll want to starsky/hutch the crap out of it and show off. chuckle. (better not break it right away!) and if he does, it better be against a damn muscle car, not a little 4 cyl lawn mower sounding POS/fast&furious crap.

thanks again for your time!

Frank

 

See if this helps: http://www.transmissioncenter.net/sp...____va.htm#t10

 

you didnt replace the gears as a set and you went with a different driven spedo gear?..a larger one at that?

you have to change your output shaft drive gear for spedo with the driven gear. they are matched sets neither part is adjustable and have a set distance apart if you increase the size of one gear its going to mesh to tight with the drive gear you will eventually strip a gear

 

^ Not so. One drive gear will work with a number of different driven gears. More teeth does not mean larger around. You need to change the drive gear once the range gets too far apart. Look at the link I posted above.