OutlawZ

iTrader: (4)

I have a TH400 with a 4000 stall converter all from ATI. Tranny was just rebuilt with new bands, seals, etc.... Tranny has a brake, external cooler, with teflon lined braided steel lines. Deep aluminum pan... blah blah blah... Well the other day and as of late my tranny temps have been skyrocket high just sitting there or putt putting around under light throttle... like putting the car on the trailer....

Temps reached 250 degrees and pegged my autometer gauge the other day just getting the car on the trailer!!!!!! Yet I could grab the cooler lines with my hand without getting burned..... It's an electrical autometer transmission temp gauge... I'm thinking the sender is FUBAR as others have said.... You guys think there is any other reason why a tranny would get THAT hot just sitting around. Previously the tranny never got hotter than like 190.....

The sending unit sat in the tranny pan for about three years while I rebuilt the entire car.... Any way to test the sender other than pull it out and replace it with a known good one and see if problem goes away????

cablebandit

iTrader: (37)

if it were that hot it woulda burned the **** out of you

theblur98ss

iTrader: (71)

what kind of cooler setup are you running? If it's truely getting that hot I'd get one with a fan built in.

Camaro396

iTrader: (14)

My trans got up to 250 degrees once, and that was the end of its life. I think your gauge is ******* with you. Get a mechanical one, and weld a bung into the pan.

OutlawZ

iTrader: (4)

Well I'd get a mechanical one but my tranny gauge runs into the car and I don't think that's legal no????

And yes I have a Perma Cool cooler with a fan built in.... It's about 12" wide by about 10" long and has roughly 2" deep fins with a small fan built in. My tranny got up to 250 and it was running..... I also think the gauge is jacked but it's tough to figure out for sure unless I can get a temp mechanical setup and see what it gets up to and compare it to what the electrical reads... Or just get a new sender cause this thing worked fine before....

performabuilt

iTrader: (25)

Get a cheap laser thermometer aim at pan you will get a close idea

Vortech Converters

Sounds like the sender/gauge to me. If sump temp is 250, the converter temp and the temp out to cooler would be 300 plus. You would't get very far.

Circle-D

iTrader: (21)

2 possibilities

Sender unit bad - Most likely

Cooler flow restricted, fluid is not getting cooled, and the lines are not getting that hot. But if this were the case, 250 degrees would have caused some noticeable damage.

Chris

OutlawZ

iTrader: (4)

But I've seen people with race trannies that just run a U fitting from cooler line to cooler line and don't run a cooler at all and they don't see 250 degree temps..... So if my cooler was clogged would it get up to 250 degrees anyway?????

I think i'll try one of those laser heat guns at first after I swap out sending units.....

382ssz28

iTrader: (24)

Performa is right. Get an infra red thermometer from Snap-on and aim it at your pan at the same time you hit 250*. I'll bet this will confirm a bad sender.

01ssreda4

iTrader: (96)

sending unit bad

ponyeater01LS1

im betting sending unit or a ground wire for the gauge

OutlawZ

iTrader: (4)

sorry for the late update... yup bad ground wire on the gauge. It seems that if you have a bad ground on any autometer gauge they will read jacked up...

performabuilt

iTrader: (25)

Good you got it solved