4+3 no reverse...What gives?
Thread Starter
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
4+3 no reverse...What gives?
My 4+3 has overdrive, just does not have reverse. What is the problem?
is it the sprague?
I haven't opened it up yet.
THanks
is it the sprague?
I haven't opened it up yet.
THanks
Drifting
Joined: May 2006
Posts: 1,428
Likes: 7
From: Chewelah Wa
This is what happened to mine years ago. Consensus was that it was toast, that something (possibly the sprag clutch) spins in the case or something. It was a long time ago, and I got that info off of the site where you could buy the rebuilds and the upgraded parts. That site has since moved...5speed sumthin. com. I ordered me up an 88 off of Ebay and have been running that since. I still have the old one.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Carrier Bearing Failure:
The carrier assembly holds the planetary gears in the overdrive. The planetary gear system is what steps up your output shaft speed to give you an overdrive.
In direct mode the planetary gears as a whole are locked to both the input and output shafts of the overdrive.
Since they lock both shafts together with no overdrive the carrier and planets spin together.
When you have overdrive the planetary carrier is locked to the case and is stopped. Power then flows thru the planet gears and steps up your output shaft speed .
So in overdrive mode the bearing is not turning but in direct mode it is. Bearing noise will be heard in direct mode and not in overdrive if the bearing is failing.
Sometimes it can be mistaken for a tire or rear end noise, so pay attention and see if the noise goes away in overdrive.
When a unit gets bad you will also loose reverse.
Assumes of course that the reverse selector lever is working correctly and selecting reverse, check before dismantling O/d unit
Thread Starter
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
Well, I found it when I tried to make a u turn at a freeway on ramp, and I couldn'/t back away from the curb to finish turning around. It barely moved with high revs.
When I finished pushing it back, and then got on the freeway, the overdrive worked ok.
I guess I will just have to take it apart and see.
By the way, it was in my pickup truck, I installed my spare trans.
When I finished pushing it back, and then got on the freeway, the overdrive worked ok.
I guess I will just have to take it apart and see.
By the way, it was in my pickup truck, I installed my spare trans.
Melting Slicks
Joined: Jan 2008
Posts: 2,054
Likes: 120
From: AZ
Different issues and the biz was sold to a Long Island outfit. Mine was sent to Paul, in Boca Raton for overhaul. Last I checked, the site worked and the new guys I spoke with seemed okay.
http://www.5speeds.com/dne.htm
Read that, but it will refer you to:
http://www.skspeed.com/corvette_transmission.aspx
after a couple clicks, that is.
http://www.5speeds.com/dne.htm
Read that, but it will refer you to:
http://www.skspeed.com/corvette_transmission.aspx
after a couple clicks, that is.
Last edited by whalepirot; Aug 8, 2012 at 09:10 PM.
Racer
Joined: Dec 2003
Posts: 277
Likes: 3
Carrier bearing
Carrier Bearing Failure:
The carrier assembly holds the planetary gears in the overdrive. The planetary gear system is what steps up your output shaft speed to give you an overdrive.
In direct mode the planetary gears as a whole are locked to both the input and output shafts of the overdrive.
Since they lock both shafts together with no overdrive the carrier and planets spin together.
When you have overdrive the planetary carrier is locked to the case and is stopped. Power then flows thru the planet gears and steps up your output shaft speed .
So in overdrive mode the bearing is not turning but in direct mode it is. Bearing noise will be heard in direct mode and not in overdrive if the bearing is failing.
Sometimes it can be mistaken for a tire or rear end noise, so pay attention and see if the noise goes away in overdrive.
When a unit gets bad you will also loose reverse.
Assumes of course that the reverse selector lever is working correctly and selecting reverse, check before dismantling O/d unit
Carrier Bearing Failure:
The carrier assembly holds the planetary gears in the overdrive. The planetary gear system is what steps up your output shaft speed to give you an overdrive.
In direct mode the planetary gears as a whole are locked to both the input and output shafts of the overdrive.
Since they lock both shafts together with no overdrive the carrier and planets spin together.
When you have overdrive the planetary carrier is locked to the case and is stopped. Power then flows thru the planet gears and steps up your output shaft speed .
So in overdrive mode the bearing is not turning but in direct mode it is. Bearing noise will be heard in direct mode and not in overdrive if the bearing is failing.
Sometimes it can be mistaken for a tire or rear end noise, so pay attention and see if the noise goes away in overdrive.
When a unit gets bad you will also loose reverse.
Assumes of course that the reverse selector lever is working correctly and selecting reverse, check before dismantling O/d unit
