Corvette Servo DISASTER

[Hipster]

yes servo travel should be checked. doing something like installing a longer pin is a bandaid fix until the owner can save up for a rebuild or new vehicle. who knows if a fix like this would have worked for a few days or years....

Hard to fix a bullet wound with a bandaid, lol

 

[tayto]

i have some seen/fixed some units where the servo travel was so wide putting in a longer pin fixed the unit. this is usually units that flare on the 2-3 shift. if the previous builder didn't care or didn't check servo travel this is definitely a good fix if you know the unit hasn't slipped. but to fix a worn band it's definitely a bandaid fix and YMMV.

 

[Hipster]

i have some seen/fixed some units where the servo travel was so wide putting in a longer pin fixed the unit. this is usually units that flare on the 2-3 shift. if the previous builder didn't care or didn't check servo travel this is definitely a good fix if you know the unit hasn't slipped. but to fix a worn band it's definitely a bandaid fix and YMMV.

offhand, I don't remember what the clearance number was but there's definitely a specification for it. Also don't remember if it was in ATSG as well as the paperwork included with the part. I pretty much leave od transmissions to the trans guys these days.

 

[Supercharged111]

i have some seen/fixed some units where the servo travel was so wide putting in a longer pin fixed the unit. this is usually units that flare on the 2-3 shift. if the previous builder didn't care or didn't check servo travel this is definitely a good fix if you know the unit hasn't slipped. but to fix a worn band it's definitely a bandaid fix and YMMV.

But I ASSume that fix involved measuring. I vaguely recall that being called out when I did my servo and shift kit. My shifts were fine though, so I deburred and reused the original pin.

 

[tayto]

offhand, I don't remember what the clearance number was but there's definitely a specification for it. Also don't remember if it was in ATSG as well as the paperwork included with the part. I pretty much leave od transmissions to the trans guys these days.

yes i think GM wants like 1/8" or more. don't use factory specs here you want .060" to .080" max on a new band.

But I ASSume that fix involved measuring. I vaguely recall that being called out when I did my servo and shift kit. My shifts were fine though, so I deburred and reused the original pin.

yes i always measure with dial indicator. i just put my DIY shift kit into a 4L60E that's going into my late 80s caprice with an LT1 (gen2). The servo travel was .090" on a used band and existing pin, so i sent it.

 

[JPVortex]

Yeah I bet I fried the trans. It does have 2nd though. New trans time

 

[JPVortex]

I did not measure servo travel because as you guys said it was a bandaid for about a month, but seems like I dont get to wait a month now.

I stopped as soon as I noticed something was wrong and had my brother bring trans fluid. But it may have been too late.

I had a 2-3 flare shift so I'm wondering if the old fluid was holding the clutches together and losing all of it and putting new stuff in killed it.

 

[JPVortex]

Or the heat from low fluid killed it

 

[tayto]

if it is fried it's because you drove on it 2 quarts low. even 1 quart low is enough to fry the transmiss. old fluid with clutch material in it is a myth.

 

[JPVortex]

Getting new transmission in an hour! Old one is like 90% of the way out. Only things left to do is drop the crossmember, support the trans and bell housing bolts.