Another 'losing reverse' thread -- but with details!!! - Chevy Impala SS Forum
Impala SS Forum
Go Back   Chevy Impala SS Forum > 91-96 Impala/B-body > Drivetrain
New User? Register - Forgot Password

Reply
 
Thread Tools Display Modes
  #1  
Old 03-29-2012, 04:12 PM
mickymac mickymac is offline
Junior Member
 
Join Date: Sep 2011
Location: Los Angeles, CA
Posts: 8
mickymac is on a distinguished road
Default Another 'losing reverse' thread -- but with details!!!

Hi, I know this problem has been asked before, but it seems like everyone else’s problem is slightly different enough to make me ask the question again.

The car: 1995 Impala SS, 145,000 miles; original everything, no rebuilds on anything. Tranny fluid was last replaced around 100,000.

The problem: losing reverse - still backs up on a level road, but with a intermittent chatter. If I’m going slightly uphill and have to push on the gas — nothing. If I REALLY step on the gas, it ‘catches’, takes off really quick.

All the other gears work fine (I think: I hear it shifting around 15, 25, and 35); the engine ‘brakes’ in manual 1st; the fluid looks old, but I don’t think it smells burnt

The “4L60E common failures” page tells me...

“…“lo-reverse” clutches are worn out, fluid leak in the reverse apply circuit, or broken sunshell. It is possible to help a fluid problem by removing the checkball from its cage in the case in the rear of the trans may help (must remove valvebody), or adding a high-viscosity additive such as Lucas Transmission additive or other seal restorer product. May also have worn boost valve (can replace this by removing the pan).”

A Trans shop told me that it’s the “trans pump” is out, as is the converter, and that I’ll need a full rebuild; he said that line pressure dropped when the car was warm, and no codes showed up (unfortunately, I don’t think I trust him)

Here’s my overly-optimistic thinking: since I’ve still got all the forward gears, my “reverse” problem is a pressure one. Since I don’t have trans pressure gauge or scanner, I’m going to 1) drain the transmission, 2) drop the pan, 3) look for it for clutch material/clean, 4) remove the checkball behind the valvebody, 5) look at the boost valve/replace if necessary, 6) put it back together, 7) add some seal restorer, and 8) drive it and hope it made some difference.

Where do I find this checkball? What does a valvebody and boost valve look like and where can I find them? Does a “worn boost valve” look “worn”? Since they’re only $17, should I just replace it while I’m there?

Can anyone offer advice on this plan of attack? Can anyone recommend a good trans guy in LA?

Thanks in advance.
__________________
Culver City, CA -- 1995 Impala SS; 150K miles; stock everything
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 03-29-2012, 04:35 PM
cahall cahall is offline
Banned
 
Join Date: Jan 2012
Location: Newark, Delaware
Posts: 278
cahall is on a distinguished road
Default

Chances are either your reverse input clutches or low/reverse clutches are worn or burnt. When this happens, they gain clearance which will usually cause a chatter like you've explained. Low reverse failure is more common in early 4L60E's, because of the slow exhaust of reverse fluid. A broken sun shell will cause you to lose 2nd and 4th also. I think you're looking in the wrong area, if looking for the boost valve to be the problem. Taking that checkball out now is like "closing the barn door, after the horse has got out". The damage is already done...

Frank

Last edited by cahall; 03-29-2012 at 04:41 PM.
Reply With Quote Quick reply to this message
  #3  
Old 03-29-2012, 05:09 PM
mickymac mickymac is offline
Junior Member
 
Join Date: Sep 2011
Location: Los Angeles, CA
Posts: 8
mickymac is on a distinguished road
Default

...so full rebuild then? I mean, I'm assuming that this isn't something that can be spot repaired, right?
Follow-up questions: 1) what would differentiate a boost valve problem? 2) Should the trans give me any codes? 3) In rebuilding the trans, does everything have to be replaced, like the torque converter? Is there anything I can do to save money? I mean, there's no way I could rebuild a trans, but I can sure as hell tear one out and put it back in.
__________________
Culver City, CA -- 1995 Impala SS; 150K miles; stock everything
Reply With Quote Quick reply to this message
  #4  
Old 03-29-2012, 05:19 PM
mickymac mickymac is offline
Junior Member
 
Join Date: Sep 2011
Location: Los Angeles, CA
Posts: 8
mickymac is on a distinguished road
Default

Oh, like I asked before, if anyone has a transmission guy in LA they'd recommend, I'm all ears.
__________________
Culver City, CA -- 1995 Impala SS; 150K miles; stock everything
Reply With Quote Quick reply to this message
  #5  
Old 03-29-2012, 08:34 PM
mickymac mickymac is offline
Junior Member
 
Join Date: Sep 2011
Location: Los Angeles, CA
Posts: 8
mickymac is on a distinguished road
Default

bump^
__________________
Culver City, CA -- 1995 Impala SS; 150K miles; stock everything
Reply With Quote Quick reply to this message
  #6  
Old 03-29-2012, 08:47 PM
1slow96's Avatar
1slow96 1slow96 is offline
Senior Member
 
Join Date: Jun 2011
Location: Dayton , Ohio
Posts: 4,879
1slow96 is on a distinguished road
Default Another 'losing reverse' thread -- but with details!!!

If you're prepared to R&R yourself consider getting one from GM. 36mo./36,000mi. warranty,all new internals.
Reply With Quote Quick reply to this message
  #7  
Old 03-30-2012, 12:44 AM
mickymac mickymac is offline
Junior Member
 
Join Date: Sep 2011
Location: Los Angeles, CA
Posts: 8
mickymac is on a distinguished road
Default

Should I replace the torque converter at the same time?
__________________
Culver City, CA -- 1995 Impala SS; 150K miles; stock everything
Reply With Quote Quick reply to this message
  #8  
Old 03-30-2012, 12:51 PM
cahall cahall is offline
Banned
 
Join Date: Jan 2012
Location: Newark, Delaware
Posts: 278
cahall is on a distinguished road
Default

Quote:
Originally Posted by mickymac View Post
Should I replace the torque converter at the same time?
Without a doubt! Or atleast have yours cut, cleaned, and inspected.

Frank
Reply With Quote Quick reply to this message
  #9  
Old 03-30-2012, 01:14 PM
mickymac mickymac is offline
Junior Member
 
Join Date: Sep 2011
Location: Los Angeles, CA
Posts: 8
mickymac is on a distinguished road
Default

Quote:
Originally Posted by cahall View Post
Without a doubt! Or atleast have yours cut, cleaned, and inspected.

Frank
Thanks, I felt silly after asking that -- of course I should at least make sure it's good. As for some other questions I asked:

1) what would differentiate a boost valve problem? (out of curiosity)

2) Should the trans be giving me any codes right now? The trans guy LA said there were none.

3) In having the trans rebuilt, is there anything I can do to save money? I mean, there's no way I could rebuild a trans, but I can sure as hell tear one out and put it back in.

4) And for any socal people, does anyone recommend a LA trans shop? I find it hard to believe there aren't a thousand gear heads from LA on this forum; no one as a recommendation?
__________________
Culver City, CA -- 1995 Impala SS; 150K miles; stock everything
Reply With Quote Quick reply to this message
  #10  
Old 03-30-2012, 01:49 PM
The Bolt-On Terror's Avatar
The Bolt-On Terror The Bolt-On Terror is offline
Senior Member
 
Join Date: Jul 2000
Location: Bright, IN
Posts: 3,321
The Bolt-On Terror is an unknown quantity at this point
Default

Quote:
Originally Posted by mickymac View Post
Oh, like I asked before, if anyone has a transmission guy in LA they'd recommend, I'm all ears.
Of course, one of the best right there in Calimesa: www.700r4l60e.com
__________________
Stock bottom 350, Built by B-Body Performance
NA: 10.98 @ 122
100 shot: 10.35 @ 128
2012 ISSCA SSuperPro Champion
2013 ISSCA SSuperNatural Champion
2013 ISSCA Roadrace Runner-up
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy Impala SS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 04:47 AM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
(c) 2007-2014 Impala SS Forum