DragRaceResults.Com    Bracket Talk    Bracket Talk Forum  Hop To Forum Categories  Tech Talk - by Abruzzi    Transmission update
Go
New
Find
Notify
Tools
Reply
  
Transmission update
 Login/Join
 
DRR S/Pro
Picture of banjo
posted
Hello all, just want to give an update on what I have found so far on my transmission

I went in and replaced all the bushings and the transmission case along with rebuilding the planets. Seemed to remove a lot of endplay, everything turns alot smoother.

The total endplay ended up at .013. It was probably in the .030-.04 when I build it, because I failed to take into account the pump gasket.

One thing I did find was I screwed up the clutch clearance on the forward drum. I found that in only had about .035 total clearance. How it didn't burn up all the clutches is beyond me. I speculate that at times the clutches were dragging more and it was trying to go to 1st and second gear at the same time. Definitely could explain what I felt in the car. It was definitely intermittent. I can only assume as things wore it caused this to get worse. New clearance is .095. I also went 7 to 5 clutches.

On the reverse clutch, I got a new piston so it eliminates some of the extra steels. I went from 6 to 5 clutches.

Definitely feel I got alot better handle on rebuilding a powerglide. First time I did it, I was in a hurry to make a race and definitely made some mistakes.


Has anyone ever tried one of these? I am going to try one to see if it helps maintain temp in the transmission.

la-210019240151&CATARGETID=230006180039217234&cadevice=m&gclid=Cj0KCQjw6rXeBRD3ARIsAD9ni9BSiJ8OlhrTPUFjjepgJHBvmXvaLX3iqiu12OSeO3ie7qtnl667p0UaAmybEALw_wcB" target="_blank">Oil thermostat

Thanks


Bill Simpkins
74 Nova
SBC 406
3240 pounds
Speierracing heads

60 1.27 (10/16)
1/8 6.03@111 (10/16)
Best 9.87@131 on the rev limitor 1 Feb 2013


nova

quarterpanelview

wheelie

FTI Converter
www.speierracingheads.com

 
Posts: 1830 | Location: San Angelo | Registered: March 07, 2005Reply With QuoteReport This Post
DRR S/Pro
Picture of banjo
posted Hide Post
Regarding the high drum clearance, was looking at the powerglide manual and it shows for a stock setup, minimum clearance is .004 per friction, looks like I had the bare minimum for a stock setuo

Those of you that build transmissions, do you function check them with air? I still have the valve body off and I was cycling each clutch. Low and high gear turn like butter and I can turn the input shaft pretty easily by hand. When I engage reverse, it takes a good bit to turn. I put a set of voice grips on it and it turns smooth, just takes more force then low and high. Is this normal? Transmission is still hanging so not sure if it has anything to do with it. Thanks


Bill Simpkins
74 Nova
SBC 406
3240 pounds
Speierracing heads

60 1.27 (10/16)
1/8 6.03@111 (10/16)
Best 9.87@131 on the rev limitor 1 Feb 2013


nova

quarterpanelview

wheelie

FTI Converter
www.speierracingheads.com

 
Posts: 1830 | Location: San Angelo | Registered: March 07, 2005Reply With QuoteReport This Post
DRR Sportsman
posted Hide Post
I bought adaptors for air testing, technical books and tools from Carl(RIP)@ TSR. I think they still sell them still. I air test everything that I can then follow up with pressure checks @ 1400 - 1500 rpm in the car.
 
Posts: 411 | Location: Highland,Ca | Registered: December 06, 2002Reply With QuoteReport This Post
DRR S/Pro
Picture of banjo
posted Hide Post
Well, got the transmission in the car, fire it. Reverse works, but slow to engage, 1st and second work great. I have the car on jack stands at this point. Put it in first and hit the button and slowly bring up the rpms. Wheels start to turn. Dam, reverse clutchs aren't holding. Check the fluid level, add a little fluid. Hit the button again and slowly bring up the rpms and the wheels start to turn. Let go of the button and the wheels don't start turning. Shift into high, and the wheels start turning. I have a pro brake, put it in reverse and the wheels start turning backwards without hitting the button. Crap shut it off. I have the transbrake valve with the spring on it. I hit the t-brake and I can't hear it. Wiring checks good.

Pull the transbrake solenoid off, and find that the valve is stuck. Dumb azz move #1, I put the original bent valve back in.

So I get the new valve and its moving smooth.

Get it back together, fire it up. Transbrake is still not holding.

I have two breathers on my transmission, and I had just put new lines on there and hadn't run them into an overflow. They are just laying across the top of the engine. This is about the point that I realize that fluid is flowing out of the lines all over my engine and floor.
Thinking crap, something is bad wrong with this thing. Going to have to come back out. So I got into my shop to get some cleaning supplies, and I look over and see the plate that goes between the rear support and the case.

So I put the plate back in there, and everything is happy.

So powerglide building tips, if you identify bad parts, ensure you get them out of your work area.

#2, don't forget the rear plate.

Plan is to race it tomorrow, hopefully all my headaches are behind me. Will update later.

thanks


Bill Simpkins
74 Nova
SBC 406
3240 pounds
Speierracing heads

60 1.27 (10/16)
1/8 6.03@111 (10/16)
Best 9.87@131 on the rev limitor 1 Feb 2013


nova

quarterpanelview

wheelie

FTI Converter
www.speierracingheads.com

 
Posts: 1830 | Location: San Angelo | Registered: March 07, 2005Reply With QuoteReport This Post
DRR Pro
Picture of chasracer
posted Hide Post
WinkYep - that plate is mighty important. If you ever decide to, I like the aftermarket support plate with the roller bearing in it. It eliminates that plate.
 
Posts: 1135 | Location: The problem is not the problem. The problem is your attitude about the problem. Savvy?” ~~ Captain Jack Sparrow ~~ | Registered: August 21, 2000Reply With QuoteReport This Post
DRR S/Pro
Picture of banjo
posted Hide Post
I got to run it this weekend, and my issue is fixed!, 9 passes off the foot-brake, over 7 hours, the 60-330 moved .010. I actually pulled out a win the first time out with it. This is a new track for me at higher altitude then I usually race at, but it appears I picked up close to a 10th. In two weeks I will race at a track that I have more paper on and will be able to determine definitively.


Bill Simpkins
74 Nova
SBC 406
3240 pounds
Speierracing heads

60 1.27 (10/16)
1/8 6.03@111 (10/16)
Best 9.87@131 on the rev limitor 1 Feb 2013


nova

quarterpanelview

wheelie

FTI Converter
www.speierracingheads.com

 
Posts: 1830 | Location: San Angelo | Registered: March 07, 2005Reply With QuoteReport This Post
DRR Top Comp
Picture of Curly1
posted Hide Post
Congratulations on the win and glad you resolved the issue.


https://postimg.cc/gallery/np3zpruo/
"Dunning-Kruger Effect"
-a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge.

Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue.

4X NE2 CHAMPION. 2020 TDRA NE2 Champion
 
Posts: 4063 | Location: United States of Texas | Registered: April 02, 2011Reply With QuoteReport This Post



DRR Pro
Picture of Brktracer
posted Hide Post
Nice job, Bill! Congrats on your win and your success in rebuilding your own transmission. Well deserved win!


Matt Ward



 
Posts: 1394 | Location: South Carolina | Registered: March 20, 2004Reply With QuoteReport This Post
  Powered by Social Strata  
 

DragRaceResults.Com    Bracket Talk    Bracket Talk Forum  Hop To Forum Categories  Tech Talk - by Abruzzi    Transmission update

© DragRaceResults.com 2024