Go Back   VetteMOD.com > VetteMOD Technical Discussion > Drive Train

Reply
 
Thread Tools
  #1  
Old 05-19-2017, 11:31 AM
OZgreen69's Avatar
OZgreen69 OZgreen69 is offline
Australia | Addict
 
Join Date: Apr 2016
Location: Perth Australia
Posts: 217
My Photos: (178)
Default Questions about differential

In the parts that I have to built my racer, I have an apparently rebuilt 4.10 diff (told by the P.O) that I am having a closer look at.
The free lateral play in the stub axles was quite alarming enough to make me removing the cover.

[Only registered and activated users can see links. Click Here To Register...]

As it has been stored with no oil in it, you start to understand my concerns.
At first the inside wasn't looking too bad until I started to clean the goo left by the yellow marking compound, and checked the bearing drag with my new CDI wrench.
Readings all over the place. Then, crown wheel's out and I noticed the rusty bearings!! Pinion to follow and same same ! Do I really need a shim on a crush sleeve ??

[Only registered and activated users can see links. Click Here To Register...]

Now, I am thinking about re gearing to 3.73 with gears that I bought from Tom's. And I need your help.


[Only registered and activated users can see links. Click Here To Register...]

On the picture, I have the original ( craked ! )posi housing with a 3.08 gear and the actual 4.10 . I understand that the height of the flange are not the same depending on your ratio. But if I want to use my 3.73 gear, do I need to use the thick one or the thin flange ?

[Only registered and activated users can see links. Click Here To Register...]

Another question is about posi housing model

[Only registered and activated users can see links. Click Here To Register...]
[Only registered and activated users can see links. Click Here To Register...]

Would you know if I can use the housing with the square opening , or this is a older model ?

Thanks in advance.
Reply With Quote
  #2  
Old 05-19-2017, 11:42 AM
rtj's Avatar
rtj rtj is online now
United States | Addict
 
Join Date: Nov 2011
Posts: 1,945
My Photos: (80)
Default

If you are lucky Gary will answer your questions. But, definitely read his diff rebuild threads. Also, a young guy wrote a long thread on rebuilding a diff, he was being coached by an expert. Stinger was his screen name.

Buy or borrow a good case spreader, I made one, but a pro tool would have been better.

Last edited by rtj; 05-19-2017 at 11:48 AM..
Reply With Quote
  #3  
Old 05-19-2017, 11:43 AM
rtj's Avatar
rtj rtj is online now
United States | Addict
 
Join Date: Nov 2011
Posts: 1,945
My Photos: (80)
Default

[Only registered and activated users can see links. Click Here To Register...]

Looks like he posted it here.
Reply With Quote
  #4  
Old 05-19-2017, 11:45 AM
rtj's Avatar
rtj rtj is online now
United States | Addict
 
Join Date: Nov 2011
Posts: 1,945
My Photos: (80)
Default

Gary posted a bunch here:
[Only registered and activated users can see links. Click Here To Register...]
Reply With Quote
  #5  
Old 05-20-2017, 12:16 AM
OZgreen69's Avatar
OZgreen69 OZgreen69 is offline
Australia | Addict
 
Join Date: Apr 2016
Location: Perth Australia
Posts: 217
My Photos: (178)
Default

Thanks RTJ, I have been following all Gary's threads for some time now here and on other forums and yes the thread from the young guy is really good.
About the speader, mine is for Dana diff, too big , thinking about modifying it.
Reply With Quote
  #6  
Old 05-20-2017, 12:53 AM
OZgreen69's Avatar
OZgreen69 OZgreen69 is offline
Australia | Addict
 
Join Date: Apr 2016
Location: Perth Australia
Posts: 217
My Photos: (178)
Default

Well after a nice breakfast and a good cup of coffee, I found some old posts from Gary's ( must have been blind last night ) who answer all my questions
To resume : I need a 3 serie carrier to go 3.73, the thin flange one. And the carrier with a square window is to be avoided. Old design prone to cracking.

Thanks RTJ for that good start of the day.
Reply With Quote
  #7  
Old 05-20-2017, 02:58 AM
GTR1999's Avatar
GTR1999 GTR1999 is offline
United States | Gearhead
 
Join Date: Mar 2008
Location: New Haven CT USA
Posts: 458
My Photos: (4)
Default

Hi
I just stopped by and saw this.

First off there is no 410 ratio for a vette, there is a 411 really not much of a difference. Just as GM never had a 373 for vette it was a 370. The 373 has more teeth and it stronger in my opinion.

The difference between the 3 series and 4 series is the flange thickness. The old way of converting from a 3 to 4 series gear was to use a thin spacer ring between the flange and ring gear. That often led to the RG bolts loosening up and the gear breaking. Tom has has 4 series gears made for 3 series cases for many years now. Tom's gears are the BEST made for 63-79 vettes. They are the only usa made gear set left for a 63-79. The others are imported, if a vette vendor claims their gears are USA made keep in mind they do not make them they just rebox Tom's gears - if they are USA made.

The square window posi's were used from 65-68, some early 69s too and are NOT that good. They were better then the 63-64 Dana but not by much. I have reused them but not until I checked them in several places for cracks and FULLY polished them. I have not seen one posi polished like I do them, possibly the owners like yourself will do it but not one vette rebuilder out there has one fully polished. Some claim to or that their case is just as good but they are typically self serving BS artist's. Personally I would not use a square window case for a HP build. I purchased a skid load of the GM posi cases when they were obsoleted years ago and these are the best cases to use. The new loaded cases are ok but not as good as a NOS made for GM Eaton posi case.

Building a posi for HP use depends on application, HP, Trans, Traction, and Driving style. Answer those questions and rest can be determined. For instance a 400hp automatic car with street tires doesn't need a Super 10-( a Real one not the current knock off on the market) or a 12 bolt -unless the owner doesn't care about the cost or the builder is dishonest.

Tom sold his business but is still helping out so I would figure on what type of build you are going to get and buy the parts now.

If you have the patience, tools, work area and access to machines you can build one as good as mine and one that is better then the rest.
__________________
69 SB 4 Spd Vert- under resto(sitting in my garage)
72 SB Auto Coupe- 355,TH400 336's (drive 1k miles yr)
75 L82 4spd Coupe- Gave to my son, the gearhead.(going to 12-bolt,3.5 shafts,& 31 spl axles)
67 coupe- gone but not forgotten.( like to get another one some day)
Reply With Quote
  #8  
Old 05-20-2017, 03:28 AM
OZgreen69's Avatar
OZgreen69 OZgreen69 is offline
Australia | Addict
 
Join Date: Apr 2016
Location: Perth Australia
Posts: 217
My Photos: (178)
Default

Thanks Gary for the reply. I am sending you an Email.
Reply With Quote
  #9  
Old 05-20-2017, 01:08 PM
GTR1999's Avatar
GTR1999 GTR1999 is offline
United States | Gearhead
 
Join Date: Mar 2008
Location: New Haven CT USA
Posts: 458
My Photos: (4)
Default

My new email for corvettes is [Only registered and activated users can see links. ]
Reply With Quote
  #10  
Old 05-24-2017, 02:00 PM
GTR1999's Avatar
GTR1999 GTR1999 is offline
United States | Gearhead
 
Join Date: Mar 2008
Location: New Haven CT USA
Posts: 458
My Photos: (4)
Default

Looking back over the 2nd picture- Check the pinion OD for a groove where the seal rides. If your finger nail catches in it then you need a speedy sleeve or new yoke.

There is also a small shim shown, I am assuming it is for the crush sleeve. You don't shim those, they should be crushed for 15-20 in/lb of drag. I go 17-20.

The new master kit should have a new sleeve. Measure the old one and crush the new on in a press on an pinion with slip fit bearings to about 030" over the old length then test it in the diff. The press will start the press for you and once you get it going it will compress fast so be careful
Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not 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. The time now is 04:56 PM.
 


Design by: vBulletin Skins Zone
Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.