3 4 input drum comparability and clearance question
#1
On The Tree
Thread Starter
3 4 input drum comparability and clearance question
97 4l60e single piece case from a Camaro
the 3-4 input drum had a slight hairline crack between the shaft and case where it presses in. I purchased a new input drum - making sure it's the 298mm style shaft. They both have the same casting number 8678716 and look identical.
however, when I measure the input shaft it's a couple of mm longer then the original. I understand theres a few different sized inpit shaft lengths. Does this matter?
my second question is regarding the 3 4 clutch clearance. I'm using a feeler gauge between the last clutch and the end plate. Is that correct way to check? I'm getting about 45 thousands so thinking I might be a little on the tight side.
if I check the clearance between the end plate and snap ring, I have to apply a bit of downward pressure to fit the feeler guages in.
any help greatly appreciated
the 3-4 input drum had a slight hairline crack between the shaft and case where it presses in. I purchased a new input drum - making sure it's the 298mm style shaft. They both have the same casting number 8678716 and look identical.
however, when I measure the input shaft it's a couple of mm longer then the original. I understand theres a few different sized inpit shaft lengths. Does this matter?
my second question is regarding the 3 4 clutch clearance. I'm using a feeler gauge between the last clutch and the end plate. Is that correct way to check? I'm getting about 45 thousands so thinking I might be a little on the tight side.
if I check the clearance between the end plate and snap ring, I have to apply a bit of downward pressure to fit the feeler guages in.
any help greatly appreciated
Last edited by grasshopper645; 01-28-2019 at 04:05 AM.
#2
TECH Junkie
45 thou is loose
#4
On The Tree
Thread Starter
The ATSG says I should be between .060-.085", are you suggesting that this range is to loose? Granted we all like it tight, your suggesting seems tighter then the ATSG specs? I'm not disagreeing with you, i'm an amitaur, just trying to understand so I get it right
#5
TECH Junkie
Atsg specs for the 60 are trash.
Run .003 clearance per friction plate
Run .003 clearance per friction plate
#6
On The Tree
Thread Starter
OK great, i'll get a slightly thicker plate to reduce the clearence.
Since i'm running a stock 4 friction setup, i'll aim for .012ish.
Thanks for your help sirs
Since i'm running a stock 4 friction setup, i'll aim for .012ish.
Thanks for your help sirs
#7
TECH Junkie
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#8
TECH Junkie
If you're planning on running a 4 friction setup, you should probably put the snap ring pliers down and read that atsg manual again.
I put 7 minimum in everything.
I put 7 minimum in everything.
#11
TECH Junkie
Don't do that. You'll regret it.
If you have a .192 backing plate...run the following:
.223 apply
7x.080 clutch
6x.077 steel
.192 back
.092 snap
If you have a .192 backing plate...run the following:
.223 apply
7x.080 clutch
6x.077 steel
.192 back
.092 snap
#13
On The Tree
Thread Starter
My reason for sticking with 6 frictions is because i planned on keeping it stock. No interest in any performance modifications to the vehicle so was just trying to keep it the way it came from the factory. Having said that, i don't want to cut corners.
#14
TECH Veteran
iTrader: (1)
unless its a stock v6, you better not run just 6 frictions. 7 at the very least. but if you run 8 and your using thinner steels, at least run kolene steels. make sure you put the return springs back in, they are in there for a reason, to release the clutch pack. I see it all the time where builders dont put these back and the 3-4 clutches wear prematurely. You wouldnt leave out any of the other return springs would you? theres three other release spring assemblies in the trans.......I never see those left out. For good reason. I'm pretty sure if it wasnt needed, gm could have saved a pretty penny not having to include them.
#15
TECH Junkie
using stock frictions from a kit will likely lead to more than .045 clearance.
Frictions and steels are very cheap...you're probably looking at less than $20 total to do a 7 clutch setup the proper way.
The stock 6 friction setup was a mistake...especially considering how damn easy and durable a 7 clutch setup is.
But...if the factory saved $2 on every trans they did...I'm sure that would be worth plenty when added all up
Frictions and steels are very cheap...you're probably looking at less than $20 total to do a 7 clutch setup the proper way.
The stock 6 friction setup was a mistake...especially considering how damn easy and durable a 7 clutch setup is.
But...if the factory saved $2 on every trans they did...I'm sure that would be worth plenty when added all up
#16
On The Tree
Thread Starter
unless its a stock v6, you better not run just 6 frictions. 7 at the very least. but if you run 8 and your using thinner steels, at least run kolene steels. make sure you put the return springs back in, they are in there for a reason, to release the clutch pack. I see it all the time where builders dont put these back and the 3-4 clutches wear prematurely. You wouldnt leave out any of the other return springs would you? theres three other release spring assemblies in the trans.......I never see those left out. For good reason. I'm pretty sure if it wasnt needed, gm could have saved a pretty penny not having to include them.
#17
On The Tree
Thread Starter
using stock frictions from a kit will likely lead to more than .045 clearance.
Frictions and steels are very cheap...you're probably looking at less than $20 total to do a 7 clutch setup the proper way.
The stock 6 friction setup was a mistake...especially considering how damn easy and durable a 7 clutch setup is.
But...if the factory saved $2 on every trans they did...I'm sure that would be worth plenty when added all up
Frictions and steels are very cheap...you're probably looking at less than $20 total to do a 7 clutch setup the proper way.
The stock 6 friction setup was a mistake...especially considering how damn easy and durable a 7 clutch setup is.
But...if the factory saved $2 on every trans they did...I'm sure that would be worth plenty when added all up
Appreciate all your help.
Regarding the stock frictions from the kit clearence, yeah your probably right. I can actually fit a 55 thousands guage in there, but its a pretty tight fit.
#18
LS1Tech Sponsor
iTrader: (25)
Excellent thanks! great news regarding the shaft
The ATSG says I should be between .060-.085", are you suggesting that this range is to loose? Granted we all like it tight, your suggesting seems tighter then the ATSG specs? I'm not disagreeing with you, i'm an amitaur, just trying to understand so I get it right
The ATSG says I should be between .060-.085", are you suggesting that this range is to loose? Granted we all like it tight, your suggesting seems tighter then the ATSG specs? I'm not disagreeing with you, i'm an amitaur, just trying to understand so I get it right
__________________
#19
TECH Enthusiast
#20
TECH Enthusiast
Excellent thanks! great news regarding the shaft
The ATSG says I should be between .060-.085", are you suggesting that this range is to loose? Granted we all like it tight, your suggesting seems tighter then the ATSG specs? I'm not disagreeing with you, i'm an amitaur, just trying to understand so I get it right
The ATSG says I should be between .060-.085", are you suggesting that this range is to loose? Granted we all like it tight, your suggesting seems tighter then the ATSG specs? I'm not disagreeing with you, i'm an amitaur, just trying to understand so I get it right