4spd
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 801
Likes: 1
4spd
well got tranny out to change clutch due to slipping grinding noise and wouldn't pull at all.Original Muncie 4spd.Gears look good.Input shaft bearing has way too much side play but it is the orig on that original tranny.Trying to make up my mind up to have rebuilt or replace with a new 4spd.I like the 4spd.Not interested in converting to 5spd.Is there a new 4spd that will bolt right in without mods.Also is there any good place to ship this one for a rebuild.Still up for grabs on that one.Also what are the gear ratios in this thing.I have a 336 rear end in it.Thanks for any and all info.Its a 71 by the way.
Racer
Joined: Aug 2005
Posts: 456
Likes: 0
From: Forty Fort PA
Try Kevin Langston at "The Gear Box Transmissions, Inc." www.thegearbox.com and thegearbox@aol.com
I had good luck with them.
Good luck
langg
I had good luck with them.
Good luck
langg
Instructor
Joined: Sep 2012
Posts: 178
Likes: 17
From: South Shore Massachusetts
well got tranny out to change clutch due to slipping grinding noise and wouldn't pull at all.Original Muncie 4spd.Gears look good.Input shaft bearing has way too much side play but it is the orig on that original tranny.Trying to make up my mind up to have rebuilt or replace with a new 4spd.I like the 4spd.Not interested in converting to 5spd.Is there a new 4spd that will bolt right in without mods.Also is there any good place to ship this one for a rebuild.Still up for grabs on that one.Also what are the gear ratios in this thing.I have a 336 rear end in it.Thanks for any and all info.Its a 71 by the way.
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 801
Likes: 1
Thanks for information. I really would like to get mine rebuilt.A new Doug Nash 4spd.runs around 1,700.I just don't want to pull this thing twice.Getting to old for this crap.
Melting Slicks
Joined: Feb 2004
Posts: 2,111
Likes: 32
From: Damascus MD
4 speed
I had my original M20 rebuilt by Jody's Transmissions in PA. Nice guy knows what he is doing. Jody is also an authorized Autogear dealer.
Bill
Pro
Joined: Feb 2008
Posts: 556
Likes: 13
From: C3 Forum, Colorado
Wait a minute.
Am I missing something here? Why is everyone jumping on the rebuild boat? The way I interpret your post is, all the slipping and grinding noise is due to your worn out clutch. Right?
Side to side play on the input shaft is completely normal when out of the car. The input shaft bearing is only half of what holds the input shaft inline to the main shaft. The other half is the pilot bearing in the crank.
My guess is, if the transmission was functioning fine and all the grinding noise was coming from the the clutch, replace the clutch, reinstall the transmission and call it done.
Side to side play on the input shaft is completely normal when out of the car. The input shaft bearing is only half of what holds the input shaft inline to the main shaft. The other half is the pilot bearing in the crank.
My guess is, if the transmission was functioning fine and all the grinding noise was coming from the the clutch, replace the clutch, reinstall the transmission and call it done.
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 801
Likes: 1
Am I missing something here? Why is everyone jumping on the rebuild boat? The way I interpret your post is, all the slipping and grinding noise is due to your worn out clutch. Right?
Side to side play on the input shaft is completely normal when out of the car. The input shaft bearing is only half of what holds the input shaft inline to the main shaft. The other half is the pilot bearing in the crank.
My guess is, if the transmission was functioning fine and all the grinding noise was coming from the the clutch, replace the clutch, reinstall the transmission and call it done.
Side to side play on the input shaft is completely normal when out of the car. The input shaft bearing is only half of what holds the input shaft inline to the main shaft. The other half is the pilot bearing in the crank.
My guess is, if the transmission was functioning fine and all the grinding noise was coming from the the clutch, replace the clutch, reinstall the transmission and call it done.
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Pro
Joined: Feb 2008
Posts: 556
Likes: 13
From: C3 Forum, Colorado
When you rotate the pinion and only one wheel turns could just mean you have an open differential, not limited slip or posi-traction.
Do you feel any binding or crunching when you turn it?
I could be wrong but this almost sounds like a shift linkage problem.
Do you feel any binding or crunching when you turn it?
I could be wrong but this almost sounds like a shift linkage problem.
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 801
Likes: 1
It's definitely a positive traction. It leaves two nice long black marks when you get on it. If I remember right they started coming standard on the 69 or 70 up.I have it on jack stands and noticed the left side yoke is sticking out about 3/4 of an inch and the left is still flush with the differential. I just replaced both with brand new ones about a 1000 miles ago.Even if the clip popped off it would still rotate axle.Just doesn't make sense. As far as shifter Gose. It shifted fine.Its fairly new Hurst shifter.Nothing looked put if place when I pulled it.I could tell it wasn't in neutral. You could feel what I thought was the clutch spinning.I bet all that noise was the drive shift spinning other just wasn't turning the axles . Keep the ideas coming it won't be till next Sunday or Monday that I get back to it.Its a very nice car but the rear hasn't been rebuilt. It's original other than side yokes and new half shafts and joints.This is going to bug me to death Till I figure it out.
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
why not rebuild it yourself? It's a straightforward job that you can do in a weekend, and replace any worn sliders, gears or syncros for less than $500. when you pull the trans, remove the side cover and check the condition of the visible parts.
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 801
Likes: 1
Already have. Gears look good.It was shifting smooth till I pulled up at the house and it quit pulling. I'm just wore out.If I can get a good rebuilt one from corvette America or some place else I'm just going that route.O have a lot of time and money in it but I've had it going on 5 year's and don't have time to fool with it anymore. I'm trying to take care of two elderly parents and carry on with my private life and it's getting out of hand.I may be selling it before it's over.It just sits in the garage most of the time.