Rebuilding Muncie M20-Help!
Thread Starter
Advanced
Joined: May 2008
Posts: 58
Likes: 0
From: Apex NC
Rebuilding Muncie M20-Help!
Got it torn down, acquired a couple replacement gears, sync, washers, snap washers, gaskets, seals, etc and am trying to put it back together. Got the cluster/counter gear back in finally after removing the anti noise plate, but it was pretty tight with the thrust washers. Now the main shaft installation is giving me a fit. Got it all back together, but cannot get the last snap washer on far enough for it to snap in at the rear bearing. I have tried banging on it some and pressed it the best I could (don't have a machine press), but it just won't go. I've double checked the appropriate placement of the parts based on a diagram I got from TBTransmission and it looks right.
Any suggestions or questions?
Any suggestions or questions?
Melting Slicks
Joined: Sep 2004
Posts: 2,655
Likes: 19
I had to press mine on with a piece of pipe over the tailshaft. If you've got it on far enough to see the groove for the snapring, it may be you're using too thick of one. Mine came with 3 or 4 thickness snaprings. The thickest one would not fit.
Thread Starter
Advanced
Joined: May 2008
Posts: 58
Likes: 0
From: Apex NC
I took some pictures but I don't know how to reduce their file size and they won"t load because they are too large.
I'm wondering if I am trying to install a snap ring that is too thick?? I tried to find a thinner one locally but no luck.
The Carolina Collector Auto Fest is this weekend at the NC Farigrounds, so I thought I would ask around there.
I'm wondering if I am trying to install a snap ring that is too thick?? I tried to find a thinner one locally but no luck.
The Carolina Collector Auto Fest is this weekend at the NC Farigrounds, so I thought I would ask around there.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Limping across the line
Joined: Oct 2002
Posts: 5,295
Likes: 109
From: Peoria Az
Hard to tell from only those pics, but it appears the 2nd gear sychro is up tight against 2nd gear. Is it a new synchro? If it cant apply pressure against the cone surface of the gear it wont work as it should.
On the the snap ring.Is the mid plate up tight against the main case?
I usually assemble the main shaft, minus the reverse gear, with the mid plate on the bench prior to trying to stab it into the main case. Gears,synchros ,dogs,sliders, snap rings, rear main bearing & mid plate.
What may be that holding you up is the sleeve(item 51) that presses onto the mainshaft under the 2nd gear.its probably not on all the way.
Pull the mainshaft out of the case and start disassembly and reassembly with light machine oil or a assembly lube.
Nothing wrong with a bit. of dissassembly reassembly to get it right
On the the snap ring.Is the mid plate up tight against the main case?
I usually assemble the main shaft, minus the reverse gear, with the mid plate on the bench prior to trying to stab it into the main case. Gears,synchros ,dogs,sliders, snap rings, rear main bearing & mid plate.
What may be that holding you up is the sleeve(item 51) that presses onto the mainshaft under the 2nd gear.its probably not on all the way.
Pull the mainshaft out of the case and start disassembly and reassembly with light machine oil or a assembly lube.
Nothing wrong with a bit. of dissassembly reassembly to get it right
Last edited by AzMotorhead; Nov 9, 2011 at 12:44 AM.
Melting Slicks
Joined: Sep 2004
Posts: 2,655
Likes: 19
I've only done a few but I dont think I could have ever got the sleeve off or on without a press. Make sure the sleeve is pressed on all the way. As stasted above, press the rear bearing/midplate on the shaft before you put the assembly in the case.
The rear bearing snapring comes in 0.087, 0.090, 0.093, and 0.096 thickness. Use the thickest one that will fit.
The rear bearing snapring comes in 0.087, 0.090, 0.093, and 0.096 thickness. Use the thickest one that will fit.
